You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
859 lines
99 KiB
859 lines
99 KiB
<!DOCTYPE html><html lang="zh-CN" data-theme="light"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"><title>Maven&MyBatis | 水榭听泉</title><meta name="keywords" content="后端,数据库驱动,数据持久化,Mybatis,后端框架,框架,项目管理,项目构建工具"><meta name="author" content="Ruoneo"><meta name="copyright" content="Ruoneo"><meta name="format-detection" content="telephone=no"><meta name="theme-color" content="#ffffff"><meta name="description" content="Maven&MyBatis 目标 能够使用Maven进行项目的管理 能够完成Mybatis代理方式查询数据 能够理解Mybatis核心配置文件的配置 1，Maven Maven是专门用于管理和构建Java项目的工具，它的主要功能有： 提供了一套标准化的项目结构 提供了一套标准化的构建流程（编译，测试，打包，发布……） 提供了一套依赖管理机制 标准化的项目结构： 项目"> |
|
<meta property="og:type" content="article"> |
|
<meta property="og:title" content="Maven&MyBatis"> |
|
<meta property="og:url" content="https://ismaxu.com/2017/08/23/Maven&MyBatis/index.html"> |
|
<meta property="og:site_name" content="水榭听泉"> |
|
<meta property="og:description" content="Maven&MyBatis 目标 能够使用Maven进行项目的管理 能够完成Mybatis代理方式查询数据 能够理解Mybatis核心配置文件的配置 1，Maven Maven是专门用于管理和构建Java项目的工具，它的主要功能有： 提供了一套标准化的项目结构 提供了一套标准化的构建流程（编译，测试，打包，发布……） 提供了一套依赖管理机制 标准化的项目结构： 项目"> |
|
<meta property="og:locale" content="zh_CN"> |
|
<meta property="og:image" content="https://i.loli.net/2020/05/01/gkihqEjXxJ5UZ1C.jpg"> |
|
<meta property="article:published_time" content="2017-08-23T07:16:17.000Z"> |
|
<meta property="article:modified_time" content="2022-08-27T14:55:18.173Z"> |
|
<meta property="article:author" content="Ruoneo"> |
|
<meta property="article:tag" content="后端"> |
|
<meta property="article:tag" content="数据库驱动"> |
|
<meta property="article:tag" content="数据持久化"> |
|
<meta property="article:tag" content="Mybatis"> |
|
<meta property="article:tag" content="后端框架"> |
|
<meta property="article:tag" content="框架"> |
|
<meta property="article:tag" content="项目管理"> |
|
<meta property="article:tag" content="项目构建工具"> |
|
<meta name="twitter:card" content="summary"> |
|
<meta name="twitter:image" content="https://i.loli.net/2020/05/01/gkihqEjXxJ5UZ1C.jpg"><link rel="shortcut icon" href="/img/avatar.jpg"><link rel="canonical" href="https://ismaxu.com/2017/08/23/Maven&MyBatis/"><link rel="preconnect" href="//cdn.jsdelivr.net"/><link rel="stylesheet" href="/css/index.css"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free/css/all.min.css" media="print" onload="this.media='all'"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fancyapps/ui/dist/fancybox.min.css" media="print" onload="this.media='all'"><script>const GLOBAL_CONFIG = { |
|
root: '/', |
|
algolia: undefined, |
|
localSearch: {"path":"/search.xml","preload":false,"languages":{"hits_empty":"找不到您查询的内容：${query}"}}, |
|
translate: undefined, |
|
noticeOutdate: undefined, |
|
highlight: {"plugin":"highlighjs","highlightCopy":true,"highlightLang":true,"highlightHeightLimit":false}, |
|
copy: { |
|
success: '复制成功', |
|
error: '复制错误', |
|
noSupport: '浏览器不支持' |
|
}, |
|
relativeDate: { |
|
homepage: false, |
|
post: false |
|
}, |
|
runtime: '', |
|
date_suffix: { |
|
just: '刚刚', |
|
min: '分钟前', |
|
hour: '小时前', |
|
day: '天前', |
|
month: '个月前' |
|
}, |
|
copyright: undefined, |
|
lightbox: 'fancybox', |
|
Snackbar: undefined, |
|
source: { |
|
justifiedGallery: { |
|
js: 'https://cdn.jsdelivr.net/npm/flickr-justified-gallery/dist/fjGallery.min.js', |
|
css: 'https://cdn.jsdelivr.net/npm/flickr-justified-gallery/dist/fjGallery.min.css' |
|
} |
|
}, |
|
isPhotoFigcaption: false, |
|
islazyload: true, |
|
isAnchor: false |
|
}</script><script id="config-diff">var GLOBAL_CONFIG_SITE = { |
|
title: 'Maven&MyBatis', |
|
isPost: true, |
|
isHome: false, |
|
isHighlightShrink: false, |
|
isToc: true, |
|
postUpdate: '2022-08-27 22:55:18' |
|
}</script><noscript><style type="text/css"> |
|
#nav { |
|
opacity: 1 |
|
} |
|
.justified-gallery img { |
|
opacity: 1 |
|
} |
|
|
|
#recent-posts time, |
|
#post-meta time { |
|
display: inline !important |
|
} |
|
</style></noscript><script>(win=>{ |
|
win.saveToLocal = { |
|
set: function setWithExpiry(key, value, ttl) { |
|
if (ttl === 0) return |
|
const now = new Date() |
|
const expiryDay = ttl * 86400000 |
|
const item = { |
|
value: value, |
|
expiry: now.getTime() + expiryDay, |
|
} |
|
localStorage.setItem(key, JSON.stringify(item)) |
|
}, |
|
|
|
get: function getWithExpiry(key) { |
|
const itemStr = localStorage.getItem(key) |
|
|
|
if (!itemStr) { |
|
return undefined |
|
} |
|
const item = JSON.parse(itemStr) |
|
const now = new Date() |
|
|
|
if (now.getTime() > item.expiry) { |
|
localStorage.removeItem(key) |
|
return undefined |
|
} |
|
return item.value |
|
} |
|
} |
|
|
|
win.getScript = url => new Promise((resolve, reject) => { |
|
const script = document.createElement('script') |
|
script.src = url |
|
script.async = true |
|
script.onerror = reject |
|
script.onload = script.onreadystatechange = function() { |
|
const loadState = this.readyState |
|
if (loadState && loadState !== 'loaded' && loadState !== 'complete') return |
|
script.onload = script.onreadystatechange = null |
|
resolve() |
|
} |
|
document.head.appendChild(script) |
|
}) |
|
|
|
win.activateDarkMode = function () { |
|
document.documentElement.setAttribute('data-theme', 'dark') |
|
if (document.querySelector('meta[name="theme-color"]') !== null) { |
|
document.querySelector('meta[name="theme-color"]').setAttribute('content', '#0d0d0d') |
|
} |
|
} |
|
win.activateLightMode = function () { |
|
document.documentElement.setAttribute('data-theme', 'light') |
|
if (document.querySelector('meta[name="theme-color"]') !== null) { |
|
document.querySelector('meta[name="theme-color"]').setAttribute('content', '#ffffff') |
|
} |
|
} |
|
const t = saveToLocal.get('theme') |
|
|
|
if (t === 'dark') activateDarkMode() |
|
else if (t === 'light') activateLightMode() |
|
|
|
const asideStatus = saveToLocal.get('aside-status') |
|
if (asideStatus !== undefined) { |
|
if (asideStatus === 'hide') { |
|
document.documentElement.classList.add('hide-aside') |
|
} else { |
|
document.documentElement.classList.remove('hide-aside') |
|
} |
|
} |
|
|
|
const detectApple = () => { |
|
if(/iPad|iPhone|iPod|Macintosh/.test(navigator.userAgent)){ |
|
document.documentElement.classList.add('apple') |
|
} |
|
} |
|
detectApple() |
|
})(window)</script><meta name="generator" content="Hexo 6.2.0"></head><body><div id="web_bg"></div><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="avatar-img is-center"><img src="/img/avatar.jpg" onerror="onerror=null;src='/img/friend_404.gif'" alt="avatar"/></div><div class="sidebar-site-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">64</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">26</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">4</div></a></div><hr/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="/messageboard/"><i class="fa-fw fas fa-comment-dots"></i><span> 留言板</span></a></div><div class="menus_item"><a class="site-page" href="/links/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div></div></div><div class="post" id="body-wrap"><header class="post-bg" id="page-header" style="background-image: url('https://i.loli.net/2020/05/01/gkihqEjXxJ5UZ1C.jpg')"><nav id="nav"><span id="blog_name"><a id="site-name" href="/">水榭听泉</a></span><div id="menus"><div id="search-button"><a class="site-page social-icon search"><i class="fas fa-search fa-fw"></i><span> 搜索</span></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="/messageboard/"><i class="fa-fw fas fa-comment-dots"></i><span> 留言板</span></a></div><div class="menus_item"><a class="site-page" href="/links/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">Maven&MyBatis<a class="post-edit-link" href="https://git.ismaxu.com/ruoneo/hexo-generator/src/branch/main/source/_posts/Maven&MyBatis.md" title="编辑" target="_blank"><i class="fas fa-pencil-alt"></i></a></h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2017-08-23T07:16:17.000Z" title="发表于 2017-08-23 15:16:17">2017-08-23</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-08-27T14:55:18.173Z" title="更新于 2022-08-27 22:55:18">2022-08-27</time></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">6.2k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>23分钟</span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h2 id="Maven-MyBatis">Maven&MyBatis</h2> |
|
<p><strong>目标</strong></p> |
|
<blockquote> |
|
<ul> |
|
<li>能够使用Maven进行项目的管理</li> |
|
<li>能够完成Mybatis代理方式查询数据</li> |
|
<li>能够理解Mybatis核心配置文件的配置</li> |
|
</ul> |
|
</blockquote> |
|
<h2 id="1，Maven">1，Maven</h2> |
|
<p>Maven是专门用于管理和构建Java项目的工具，它的主要功能有：</p> |
|
<ul> |
|
<li> |
|
<p>提供了一套标准化的项目结构</p> |
|
</li> |
|
<li> |
|
<p>提供了一套标准化的构建流程（编译，测试，打包，发布……）</p> |
|
</li> |
|
<li> |
|
<p>提供了一套依赖管理机制</p> |
|
</li> |
|
</ul> |
|
<p><strong>标准化的项目结构：</strong></p> |
|
<p>项目结构我们都知道，每一个开发工具（IDE）都有自己不同的项目结构，它们互相之间不通用。我再eclipse中创建的目录，无法在idea中进行使用，这就造成了很大的不方便，如下图:前两个是以后开发经常使用的开发工具</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726153521381.png" alt="image-20210726153521381"></p> |
|
<p>而Maven提供了一套标准化的项目结构，所有的IDE使用Maven构建的项目完全一样，所以IDE创建的Maven项目可以通用。如下图右边就是Maven构建的项目结构。</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726153815028.png" alt="image-20210726153815028"></p> |
|
<p><strong>标准化的构建流程：</strong></p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726154144488.png" alt="image-20210726154144488"></p> |
|
<p>如上图所示我们开发了一套系统，代码需要进行编译、测试、打包、发布，这些操作如果需要反复进行就显得特别麻烦，而Maven提供了一套简单的命令来完成项目构建。</p> |
|
<p><strong>依赖管理：</strong></p> |
|
<p>依赖管理其实就是管理你项目所依赖的第三方资源（jar包、插件）。如之前我们项目中需要使用JDBC和Druid的话，就需要去网上下载对应的依赖包（当前之前是老师已经下载好提供给大家了），复制到项目中，还要将jar包加入工作环境这一系列的操作。如下图所示</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726154753631.png" alt="image-20210726154753631"></p> |
|
<p>而Maven使用标准的 ==坐标== 配置来管理各种依赖，只需要简单的配置就可以完成依赖管理。</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726154922337.png" alt="image-20210726154922337"></p> |
|
<p>如上图右边所示就是mysql驱动包的坐标，在项目中只需要写这段配置，其他都不需要我们担心，Maven都帮我们进行操作了。</p> |
|
<p>市面上有很多构建工具，而Maven依旧还是主流构建工具，如下图是常用构建工具的使用占比</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726155212733.png" alt="image-20210726155212733"></p> |
|
<h3 id="1-1-Maven简介">1.1 Maven简介</h3> |
|
<blockquote> |
|
<p>==Apache Maven== 是一个项目管理和构建==工具==，它基于项目对象模型(POM)的概念，通过一小段描述信息来管理项目的构建、报告和文档。</p> |
|
<p>官网 ：<a target="_blank" rel="noopener" href="http://maven.apache.org/">http://maven.apache.org/</a></p> |
|
</blockquote> |
|
<p>通过上面的描述大家只需要知道Maven是一个工具即可。Apache 是一个开源组织，将来我们会学习很多Apache提供的项目。</p> |
|
<h4 id="1-1-1-Maven模型">1.1.1 Maven模型</h4> |
|
<ul> |
|
<li>项目对象模型 (Project Object Model)</li> |
|
<li>依赖管理模型(Dependency)</li> |
|
<li>插件(Plugin)</li> |
|
</ul> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726155759621.png" alt="image-20210726155759621"></p> |
|
<p>如上图所示就是Maven的模型，而我们先看紫色框框起来的部分，他就是用来完成 <code>标准化构建流程</code> 。如我们需要编译，Maven提供了一个编译插件供我们使用，我们需要打包，Maven就提供了一个打包插件提供我们使用等。</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726160928515.png" alt="image-20210726160928515"></p> |
|
<p>上图中紫色框起来的部分，项目对象模型就是将我们自己抽象成一个对象模型，有自己专属的坐标，如下图所示是一个Maven项目：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726161340796.png" alt="image-20210726161340796"></p> |
|
<p>依赖管理模型则是使用坐标来描述当前项目依赖哪儿些第三方jar包，如下图所示</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726161616034.png" alt="image-20210726161616034"></p> |
|
<p>上述Maven模型图中还有一部分是仓库。如何理解仓库呢？</p> |
|
<h4 id="1-1-2-仓库">1.1.2 仓库</h4> |
|
<p>大家想想这样的场景，我们创建Maven项目，在项目中使用坐标来指定项目的依赖，那么依赖的jar包到底存储在什么地方呢？其实依赖jar包是存储在我们的本地仓库中。而项目运行时从本地仓库中拿需要的依赖jar包。</p> |
|
<p><strong>仓库分类：</strong></p> |
|
<ul> |
|
<li> |
|
<p>本地仓库：自己计算机上的一个目录</p> |
|
</li> |
|
<li> |
|
<p>中央仓库：由Maven团队维护的全球唯一的仓库</p> |
|
<ul> |
|
<li>地址： <a target="_blank" rel="noopener" href="https://repo1.maven.org/maven2/">https://repo1.maven.org/maven2/</a></li> |
|
</ul> |
|
</li> |
|
<li> |
|
<p>远程仓库(私服)：一般由公司团队搭建的私有仓库</p> |
|
<p>今天我们只学习远程仓库的使用，并不会搭建。</p> |
|
</li> |
|
</ul> |
|
<p>当项目中使用坐标引入对应依赖jar包后，首先会查找本地仓库中是否有对应的jar包：</p> |
|
<ul> |
|
<li> |
|
<p>如果有，则在项目直接引用;</p> |
|
</li> |
|
<li> |
|
<p>如果没有，则去中央仓库中下载对应的jar包到本地仓库。</p> |
|
</li> |
|
</ul> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726162605394.png" alt="image-20210726162605394"></p> |
|
<p>如果还可以搭建远程仓库，将来jar包的查找顺序则变为：</p> |
|
<blockquote> |
|
<p>本地仓库 --> 远程仓库–> 中央仓库</p> |
|
</blockquote> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726162815045.png" alt="image-20210726162815045"></p> |
|
<h3 id="1-2-Maven安装配置">1.2 Maven安装配置</h3> |
|
<ul> |
|
<li> |
|
<p>解压 apache-maven-3.6.1.rar 既安装完成</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726163219682.png" alt="image-20210726163219682"></p> |
|
<blockquote> |
|
<p>建议解压缩到没有中文、特殊字符的路径下。如课程中解压缩到 <code>D:\software</code> 下。</p> |
|
</blockquote> |
|
<p>解压缩后的目录结构如下：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726163518885.png" alt="image-20210726163518885"></p> |
|
<ul> |
|
<li>bin目录 ： 存放的是可执行命令。mvn 命令重点关注。</li> |
|
<li>conf目录 ：存放Maven的配置文件。<code>settings.xml</code> 配置文件后期需要修改。</li> |
|
<li>lib目录 ：存放Maven依赖的jar包。Maven也是使用java开发的，所以它也依赖其他的jar包。</li> |
|
</ul> |
|
</li> |
|
<li> |
|
<p>配置环境变量 MAVEN_HOME 为安装路径的bin目录</p> |
|
<p><code>此电脑</code> 右键 --> <code>高级系统设置</code> --> <code>高级</code> --> <code>环境变量</code></p> |
|
<p>在系统变量处新建一个变量 <code>MAVEN_HOME</code></p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726164058589.png" alt="image-20210726164058589"></p> |
|
<p>在 <code>Path</code> 中进行配置</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726164146832.png" alt="image-20210726164146832"></p> |
|
<p>打开命令提示符进行验证，出现如图所示表示安装成功</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726164306480.png" alt="image-20210726164306480"></p> |
|
</li> |
|
<li> |
|
<p>配置本地仓库</p> |
|
<p>修改 conf/settings.xml 中的 <localRepository> 为一个指定目录作为本地仓库，用来存储jar包。</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726164348048.png" alt="image-20210726164348048"></p> |
|
</li> |
|
<li> |
|
<p>配置阿里云私服</p> |
|
<p>中央仓库在国外，所以下载jar包速度可能比较慢，而阿里公司提供了一个远程仓库，里面基本也都有开源项目的jar包。</p> |
|
<p>修改 conf/settings.xml 中的 <mirrors>标签，为其添加如下子标签：</p> |
|
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">mirror</span>></span> </span><br><span class="line"> <span class="tag"><<span class="name">id</span>></span>alimaven<span class="tag"></<span class="name">id</span>></span> </span><br><span class="line"> <span class="tag"><<span class="name">name</span>></span>aliyun maven<span class="tag"></<span class="name">name</span>></span> </span><br><span class="line"> <span class="tag"><<span class="name">url</span>></span>http://maven.aliyun.com/nexus/content/groups/public/<span class="tag"></<span class="name">url</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">mirrorOf</span>></span>central<span class="tag"></<span class="name">mirrorOf</span>></span> </span><br><span class="line"><span class="tag"></<span class="name">mirror</span>></span></span><br></pre></td></tr></table></figure> |
|
</li> |
|
</ul> |
|
<h3 id="1-3-Maven基本使用">1.3 Maven基本使用</h3> |
|
<h4 id="1-3-1-Maven-常用命令">1.3.1 Maven 常用命令</h4> |
|
<blockquote> |
|
<ul> |
|
<li> |
|
<p>compile ：编译</p> |
|
</li> |
|
<li> |
|
<p>clean：清理</p> |
|
</li> |
|
<li> |
|
<p>test：测试</p> |
|
</li> |
|
<li> |
|
<p>package：打包</p> |
|
</li> |
|
<li> |
|
<p>install：安装</p> |
|
</li> |
|
</ul> |
|
</blockquote> |
|
<p><strong>命令演示：</strong></p> |
|
<p>在 <code>资料\代码\maven-project</code> 提供了一个使用Maven构建的项目，项目结构如下：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726170404545.png" alt="image-20210726170404545"></p> |
|
<p>而我们使用上面命令需要在磁盘上进入到项目的 <code>pom.xml</code> 目录下，打开命令提示符</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726170549907.png" alt="image-20210726170549907"></p> |
|
<p><strong>编译命令演示：</strong></p> |
|
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">compile ：编译</span><br></pre></td></tr></table></figure> |
|
<p>执行上述命令可以看到：</p> |
|
<ul> |
|
<li>从阿里云下载编译需要的插件的jar包，在本地仓库也能看到下载好的插件</li> |
|
<li>在项目下会生成一个 <code>target</code> 目录</li> |
|
</ul> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726171047324.png" alt="image-20210726171047324"></p> |
|
<p>同时在项目下会出现一个 <code>target</code> 目录，编译后的字节码文件就放在该目录下</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726171346824.png" alt="image-20210726171346824"></p> |
|
<p><strong>清理命令演示：</strong></p> |
|
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">mvn clean</span><br></pre></td></tr></table></figure> |
|
<p>执行上述命令可以看到</p> |
|
<ul> |
|
<li>从阿里云下载清理需要的插件jar包</li> |
|
<li>删除项目下的 <code>target</code> 目录</li> |
|
</ul> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726171558786.png" alt="image-20210726171558786"></p> |
|
<p><strong>打包命令演示：</strong></p> |
|
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">mvn package</span><br></pre></td></tr></table></figure> |
|
<p>执行上述命令可以看到：</p> |
|
<ul> |
|
<li>从阿里云下载打包需要的插件jar包</li> |
|
<li>在项目的 <code>terget</code> 目录下有一个jar包（将当前项目打成的jar包）</li> |
|
</ul> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726171747125.png" alt="image-20210726171747125"></p> |
|
<p><strong>测试命令演示：</strong></p> |
|
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">mvn test </span><br></pre></td></tr></table></figure> |
|
<p>该命令会执行所有的测试代码。执行上述命令效果如下</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726172343933.png" alt="image-20210726172343933"></p> |
|
<p><strong>安装命令演示：</strong></p> |
|
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">mvn install</span><br></pre></td></tr></table></figure> |
|
<p>该命令会将当前项目打成jar包，并安装到本地仓库。执行完上述命令后到本地仓库查看结果如下：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726172709112.png" alt="image-20210726172709112"></p> |
|
<h4 id="1-3-2-Maven-生命周期">1.3.2 Maven 生命周期</h4> |
|
<p>Maven 构建项目生命周期描述的是一次构建过程经历经历了多少个事件</p> |
|
<p>Maven 对项目构建的生命周期划分为3套：</p> |
|
<ul> |
|
<li>clean ：清理工作。</li> |
|
<li>default ：核心工作，例如编译，测试，打包，安装等。</li> |
|
<li>site ： 产生报告，发布站点等。这套声明周期一般不会使用。</li> |
|
</ul> |
|
<p>同一套生命周期内，执行后边的命令，前面的所有命令会自动执行。例如默认（default）生命周期如下：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726173153576.png" alt="image-20210726173153576"></p> |
|
<p>当我们执行 <code>install</code>（安装）命令时，它会先执行 <code>compile</code>命令，再执行 <code>test </code> 命令，再执行 <code>package</code> 命令，最后执行 <code>install</code> 命令。</p> |
|
<p>当我们执行 <code>package</code> （打包）命令时，它会先执行 <code>compile</code> 命令，再执行 <code>test</code> 命令，最后执行 <code>package</code> 命令。</p> |
|
<p>默认的生命周期也有对应的很多命令，其他的一般都不会使用，我们只关注常用的：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726173619353.png" alt="image-20210726173619353"></p> |
|
<h3 id="1-4-IDEA使用Maven">1.4 IDEA使用Maven</h3> |
|
<p>以后开发中我们肯定会在高级开发工具中使用Maven管理项目，而我们常用的高级开发工具是IDEA，所以接下来我们会讲解Maven在IDEA中的使用。</p> |
|
<h4 id="1-4-1-IDEA配置Maven环境">1.4.1 IDEA配置Maven环境</h4> |
|
<p>我们需要先在IDEA中配置Maven环境：</p> |
|
<ul> |
|
<li> |
|
<p>选择 IDEA中 File --> Settings</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726174202898.png" alt="image-20210726174202898"></p> |
|
</li> |
|
<li> |
|
<p>搜索 maven</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726174229396.png" alt="image-20210726174229396"></p> |
|
</li> |
|
<li> |
|
<p>设置 IDEA 使用本地安装的 Maven，并修改配置文件路径</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726174248050.png" alt="image-20210726174248050"></p> |
|
</li> |
|
</ul> |
|
<h4 id="1-4-2-Maven-坐标详解">1.4.2 Maven 坐标详解</h4> |
|
<p><strong>什么是坐标？</strong></p> |
|
<ul> |
|
<li>Maven 中的坐标是==资源的唯一标识==</li> |
|
<li>使用坐标来定义项目或引入项目中需要的依赖</li> |
|
</ul> |
|
<p><strong>Maven 坐标主要组成</strong></p> |
|
<ul> |
|
<li>groupId：定义当前Maven项目隶属组织名称（通常是域名反写，例如：com.itheima）</li> |
|
<li>artifactId：定义当前Maven项目名称（通常是模块名称，例如 order-service、goods-service）</li> |
|
<li>version：定义当前项目版本号</li> |
|
</ul> |
|
<p>如下图就是使用坐标表示一个项目：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726174718176.png" alt="image-20210726174718176"></p> |
|
<blockquote> |
|
<p>==注意：==</p> |
|
<ul> |
|
<li>上面所说的资源可以是插件、依赖、当前项目。</li> |
|
<li>我们的项目如果被其他的项目依赖时，也是需要坐标来引入的。</li> |
|
</ul> |
|
</blockquote> |
|
<h4 id="1-4-3-IDEA-创建-Maven项目">1.4.3 IDEA 创建 Maven项目</h4> |
|
<ul> |
|
<li> |
|
<p>创建模块，选择Maven，点击Next</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726175049876.png" alt="image-20210726175049876"></p> |
|
</li> |
|
<li> |
|
<p>填写模块名称，坐标信息，点击finish，创建完成</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726175109822.png" alt="image-20210726175109822"></p> |
|
<p>创建好的项目目录结构如下：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726175244826.png" alt="image-20210726175244826"></p> |
|
</li> |
|
<li> |
|
<p>编写 HelloWorld，并运行</p> |
|
</li> |
|
</ul> |
|
<h4 id="1-4-4-IDEA-导入-Maven项目">1.4.4 IDEA 导入 Maven项目</h4> |
|
<p>大家在学习时可能需要看老师的代码，当然也就需要将老师的代码导入到自己的IDEA中。我们可以通过以下步骤进行项目的导入：</p> |
|
<ul> |
|
<li> |
|
<p>选择右侧Maven面板，点击 + 号</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726182702336.png" alt="image-20210726182702336"></p> |
|
</li> |
|
<li> |
|
<p>选中对应项目的pom.xml文件，双击即可</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726182648891.png" alt="image-20210726182648891"></p> |
|
</li> |
|
<li> |
|
<p>如果没有Maven面板，选择</p> |
|
<p>View --> Appearance --> Tool Window Bars</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726182634466.png" alt="image-20210726182634466"></p> |
|
</li> |
|
</ul> |
|
<p>可以通过下图所示进行命令的操作：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726182902961.png" alt="image-20210726182902961"></p> |
|
<p><strong>配置 Maven-Helper 插件</strong></p> |
|
<ul> |
|
<li> |
|
<p>选择 IDEA中 File --> Settings</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726192212026.png" alt="image-20210726192212026"></p> |
|
</li> |
|
<li> |
|
<p>选择 Plugins</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726192224914.png" alt="image-20210726192224914"></p> |
|
</li> |
|
<li> |
|
<p>搜索 Maven，选择第一个 Maven Helper，点击Install安装，弹出面板中点击Accept</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726192244567.png" alt="image-20210726192244567"></p> |
|
</li> |
|
<li> |
|
<p>重启 IDEA</p> |
|
</li> |
|
</ul> |
|
<p>安装完该插件后可以通过 选中项目右键进行相关命令操作，如下图所示：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726192430371.png" alt="image-20210726192430371"></p> |
|
<h3 id="1-5-依赖管理">1.5 依赖管理</h3> |
|
<h4 id="1-5-1-使用坐标引入jar包">1.5.1 使用坐标引入jar包</h4> |
|
<p><strong>使用坐标引入jar包的步骤：</strong></p> |
|
<ul> |
|
<li> |
|
<p>在项目的 pom.xml 中编写 <dependencies> 标签</p> |
|
</li> |
|
<li> |
|
<p>在 <dependencies> 标签中 使用 <dependency> 引入坐标</p> |
|
</li> |
|
<li> |
|
<p>定义坐标的 groupId，artifactId，version</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726193105765.png" alt="image-20210726193105765"></p> |
|
</li> |
|
<li> |
|
<p>点击刷新按钮，使坐标生效</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726193121384.png" alt="image-20210726193121384"></p> |
|
</li> |
|
</ul> |
|
<blockquote> |
|
<p>注意：</p> |
|
<ul> |
|
<li>具体的坐标我们可以到如下网站进行搜索</li> |
|
<li><a target="_blank" rel="noopener" href="https://mvnrepository.com/">https://mvnrepository.com/</a></li> |
|
</ul> |
|
</blockquote> |
|
<p><strong>快捷方式导入jar包的坐标：</strong></p> |
|
<p>每次需要引入jar包，都去对应的网站进行搜索是比较麻烦的，接下来给大家介绍一种快捷引入坐标的方式</p> |
|
<ul> |
|
<li> |
|
<p>在 pom.xml 中 按 alt + insert，选择 Dependency</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726193603724.png" alt="image-20210726193603724"></p> |
|
</li> |
|
<li> |
|
<p>在弹出的面板中搜索对应坐标，然后双击选中对应坐标</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726193625229.png" alt="image-20210726193625229"></p> |
|
</li> |
|
<li> |
|
<p>点击刷新按钮，使坐标生效</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726193121384.png" alt="image-20210726193121384"></p> |
|
</li> |
|
</ul> |
|
<p><strong>自动导入设置：</strong></p> |
|
<p>上面每次操作都需要点击刷新按钮，让引入的坐标生效。当然我们也可以通过设置让其自动完成</p> |
|
<ul> |
|
<li> |
|
<p>选择 IDEA中 File --> Settings</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726193854438.png" alt="image-20210726193854438"></p> |
|
</li> |
|
<li> |
|
<p>在弹出的面板中找到 Build Tools</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726193909276.png" alt="image-20210726193909276"></p> |
|
</li> |
|
<li> |
|
<p>选择 Any changes，点击 ok 即可生效</p> |
|
</li> |
|
</ul> |
|
<h4 id="1-5-2-依赖范围">1.5.2 依赖范围</h4> |
|
<p>通过设置坐标的依赖范围(scope)，可以设置 对应jar包的作用范围：编译环境、测试环境、运行环境。</p> |
|
<p>如下图所示给 <code>junit</code> 依赖通过 <code>scope</code> 标签指定依赖的作用范围。 那么这个依赖就只能作用在测试环境，其他环境下不能使用。</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726194703845.png" alt="image-20210726194703845"></p> |
|
<p>那么 <code>scope</code> 都可以有哪些取值呢？</p> |
|
<table> |
|
<thead> |
|
<tr> |
|
<th><strong>依赖范围</strong></th> |
|
<th>编译classpath</th> |
|
<th>测试classpath</th> |
|
<th>运行classpath</th> |
|
<th>例子</th> |
|
</tr> |
|
</thead> |
|
<tbody> |
|
<tr> |
|
<td><strong>compile</strong></td> |
|
<td>Y</td> |
|
<td>Y</td> |
|
<td>Y</td> |
|
<td>logback</td> |
|
</tr> |
|
<tr> |
|
<td><strong>test</strong></td> |
|
<td>-</td> |
|
<td>Y</td> |
|
<td>-</td> |
|
<td>Junit</td> |
|
</tr> |
|
<tr> |
|
<td><strong>provided</strong></td> |
|
<td>Y</td> |
|
<td>Y</td> |
|
<td>-</td> |
|
<td>servlet-api</td> |
|
</tr> |
|
<tr> |
|
<td><strong>runtime</strong></td> |
|
<td>-</td> |
|
<td>Y</td> |
|
<td>Y</td> |
|
<td>jdbc驱动</td> |
|
</tr> |
|
<tr> |
|
<td><strong>system</strong></td> |
|
<td>Y</td> |
|
<td>Y</td> |
|
<td>-</td> |
|
<td>存储在本地的jar包</td> |
|
</tr> |
|
</tbody> |
|
</table> |
|
<ul> |
|
<li>compile ：作用于编译环境、测试环境、运行环境。</li> |
|
<li>test ： 作用于测试环境。典型的就是Junit坐标，以后使用Junit时，都会将scope指定为该值</li> |
|
<li>provided ：作用于编译环境、测试环境。我们后面会学习 <code>servlet-api</code> ，在使用它时，必须将 <code>scope</code> 设置为该值，不然运行时就会报错</li> |
|
<li>runtime ： 作用于测试环境、运行环境。jdbc驱动一般将 <code>scope</code> 设置为该值，当然不设置也没有任何问题</li> |
|
</ul> |
|
<blockquote> |
|
<p>注意：</p> |
|
<ul> |
|
<li>如果引入坐标不指定 <code>scope</code> 标签时，默认就是 compile 值。以后大部分jar包都是使用默认值。</li> |
|
</ul> |
|
</blockquote> |
|
<h2 id="2，Mybatis">2，Mybatis</h2> |
|
<h3 id="2-1-Mybatis概述">2.1 Mybatis概述</h3> |
|
<h4 id="2-1-1-Mybatis概念">2.1.1 Mybatis概念</h4> |
|
<blockquote> |
|
<ul> |
|
<li> |
|
<p>MyBatis 是一款优秀的==持久层框架==，用于简化 JDBC 开发</p> |
|
</li> |
|
<li> |
|
<p>MyBatis 本是 Apache 的一个开源项目iBatis, 2010年这个项目由apache software foundation 迁移到了google code，并且改名为MyBatis 。2013年11月迁移到Github</p> |
|
</li> |
|
<li> |
|
<p>官网：<a target="_blank" rel="noopener" href="https://mybatis.org/mybatis-3/zh/index.html">https://mybatis.org/mybatis-3/zh/index.html</a></p> |
|
</li> |
|
</ul> |
|
</blockquote> |
|
<p><strong>持久层：</strong></p> |
|
<ul> |
|
<li> |
|
<p>负责将数据到保存到数据库的那一层代码。</p> |
|
<p>以后开发我们会将操作数据库的Java代码作为持久层。而Mybatis就是对jdbc代码进行了封装。</p> |
|
</li> |
|
<li> |
|
<p>JavaEE三层架构：表现层、业务层、持久层</p> |
|
<p>三层架构在后期会给大家进行讲解，今天先简单的了解下即可。</p> |
|
</li> |
|
</ul> |
|
<p><strong>框架：</strong></p> |
|
<ul> |
|
<li>框架就是一个半成品软件，是一套可重用的、通用的、软件基础代码模型</li> |
|
<li>在框架的基础之上构建软件编写更加高效、规范、通用、可扩展</li> |
|
</ul> |
|
<p>举例给大家简单的解释一下什么是半成品软件。大家小时候应该在公园见过给石膏娃娃涂鸦</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726202410311.png" alt="image-20210726202410311"></p> |
|
<p>如下图所示有一个石膏娃娃，这个就是一个半成品。你可以在这个半成品的基础上进行不同颜色的涂鸦</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726202858441.png" alt="image-20210726202858441"></p> |
|
<p>了解了什么是Mybatis后，接下来说说以前 <code>JDBC代码</code> 的缺点以及Mybatis又是如何解决的。</p> |
|
<h4 id="2-1-2-JDBC-缺点">2.1.2 JDBC 缺点</h4> |
|
<p>下面是 JDBC 代码，我们通过该代码分析都存在什么缺点：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726203656847.png" alt="image-20210726203656847"></p> |
|
<ul> |
|
<li> |
|
<p>硬编码</p> |
|
<ul> |
|
<li> |
|
<p>注册驱动、获取连接</p> |
|
<p>上图标1的代码有很多字符串，而这些是连接数据库的四个基本信息，以后如果要将Mysql数据库换成其他的关系型数据库的话，这四个地方都需要修改，如果放在此处就意味着要修改我们的源代码。</p> |
|
</li> |
|
<li> |
|
<p>SQL语句</p> |
|
<p>上图标2的代码。如果表结构发生变化，SQL语句就要进行更改。这也不方便后期的维护。</p> |
|
</li> |
|
</ul> |
|
</li> |
|
<li> |
|
<p>操作繁琐</p> |
|
<ul> |
|
<li> |
|
<p>手动设置参数</p> |
|
</li> |
|
<li> |
|
<p>手动封装结果集</p> |
|
<p>上图标4的代码是对查询到的数据进行封装，而这部分代码是没有什么技术含量，而且特别耗费时间的。</p> |
|
</li> |
|
</ul> |
|
</li> |
|
</ul> |
|
<h4 id="2-1-3-Mybatis-优化">2.1.3 Mybatis 优化</h4> |
|
<ul> |
|
<li>硬编码可以配置到==配置文件==</li> |
|
<li>操作繁琐的地方mybatis都==自动完成==</li> |
|
</ul> |
|
<p>如图所示</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726204849309.png" alt="image-20210726204849309"></p> |
|
<p>下图是持久层框架的使用占比。</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726205328999.png" alt="image-20210726205328999"></p> |
|
<h3 id="2-2-Mybatis快速入门">2.2 Mybatis快速入门</h3> |
|
<p><strong>需求：查询user表中所有的数据</strong></p> |
|
<ul> |
|
<li> |
|
<p>创建user表，添加数据</p> |
|
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">create</span> database mybatis;</span><br><span class="line">use mybatis;</span><br><span class="line"></span><br><span class="line"><span class="keyword">drop</span> <span class="keyword">table</span> if <span class="keyword">exists</span> tb_user;</span><br><span class="line"></span><br><span class="line"><span class="keyword">create</span> <span class="keyword">table</span> tb_user(</span><br><span class="line"> id <span class="type">int</span> <span class="keyword">primary</span> key auto_increment,</span><br><span class="line"> username <span class="type">varchar</span>(<span class="number">20</span>),</span><br><span class="line"> password <span class="type">varchar</span>(<span class="number">20</span>),</span><br><span class="line"> gender <span class="type">char</span>(<span class="number">1</span>),</span><br><span class="line"> addr <span class="type">varchar</span>(<span class="number">30</span>)</span><br><span class="line">);</span><br><span class="line"></span><br><span class="line"><span class="keyword">INSERT</span> <span class="keyword">INTO</span> tb_user <span class="keyword">VALUES</span> (<span class="number">1</span>, <span class="string">'zhangsan'</span>, <span class="string">'123'</span>, <span class="string">'男'</span>, <span class="string">'北京'</span>);</span><br><span class="line"><span class="keyword">INSERT</span> <span class="keyword">INTO</span> tb_user <span class="keyword">VALUES</span> (<span class="number">2</span>, <span class="string">'李四'</span>, <span class="string">'234'</span>, <span class="string">'女'</span>, <span class="string">'天津'</span>);</span><br><span class="line"><span class="keyword">INSERT</span> <span class="keyword">INTO</span> tb_user <span class="keyword">VALUES</span> (<span class="number">3</span>, <span class="string">'王五'</span>, <span class="string">'11'</span>, <span class="string">'男'</span>, <span class="string">'西安'</span>);</span><br></pre></td></tr></table></figure> |
|
</li> |
|
<li> |
|
<p>创建模块，导入坐标</p> |
|
<p>在创建好的模块中的 pom.xml 配置文件中添加依赖的坐标</p> |
|
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">dependencies</span>></span></span><br><span class="line"> <span class="comment"><!--mybatis 依赖--></span></span><br><span class="line"> <span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.mybatis<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>mybatis<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>3.5.5<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="comment"><!--mysql 驱动--></span></span><br><span class="line"> <span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>mysql<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>mysql-connector-java<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>5.1.46<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="comment"><!--junit 单元测试--></span></span><br><span class="line"> <span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>junit<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>junit<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>4.13<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">scope</span>></span>test<span class="tag"></<span class="name">scope</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="comment"><!-- 添加slf4j日志api --></span></span><br><span class="line"> <span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.slf4j<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>slf4j-api<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>1.7.20<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"> <span class="comment"><!-- 添加logback-classic依赖 --></span></span><br><span class="line"> <span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>ch.qos.logback<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>logback-classic<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>1.2.3<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"> <span class="comment"><!-- 添加logback-core依赖 --></span></span><br><span class="line"> <span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>ch.qos.logback<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>logback-core<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>1.2.3<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependencies</span>></span></span><br></pre></td></tr></table></figure> |
|
<p>注意：需要在项目的 resources 目录下创建logback的配置文件</p> |
|
</li> |
|
<li> |
|
<p>编写 MyBatis 核心配置文件 – > 替换连接信息 解决硬编码问题</p> |
|
<p>在模块下的 resources 目录下创建mybatis的配置文件 <code>mybatis-config.xml</code>，内容如下：</p> |
|
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><?xml version=<span class="string">"1.0"</span> encoding=<span class="string">"UTF-8"</span> ?></span></span><br><span class="line"><span class="meta"><!DOCTYPE <span class="keyword">configuration</span></span></span><br><span class="line"><span class="meta"> <span class="keyword">PUBLIC</span> <span class="string">"-//mybatis.org//DTD Config 3.0//EN"</span></span></span><br><span class="line"><span class="meta"> <span class="string">"http://mybatis.org/dtd/mybatis-3-config.dtd"</span>></span></span><br><span class="line"><span class="tag"><<span class="name">configuration</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">typeAliases</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">package</span> <span class="attr">name</span>=<span class="string">"com.itheima.pojo"</span>/></span></span><br><span class="line"> <span class="tag"></<span class="name">typeAliases</span>></span></span><br><span class="line"> </span><br><span class="line"> <span class="comment"><!--</span></span><br><span class="line"><span class="comment"> environments：配置数据库连接环境信息。可以配置多个environment，通过default属性切换不同的environment</span></span><br><span class="line"><span class="comment"> --></span></span><br><span class="line"> <span class="tag"><<span class="name">environments</span> <span class="attr">default</span>=<span class="string">"development"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">environment</span> <span class="attr">id</span>=<span class="string">"development"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">transactionManager</span> <span class="attr">type</span>=<span class="string">"JDBC"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">dataSource</span> <span class="attr">type</span>=<span class="string">"POOLED"</span>></span></span><br><span class="line"> <span class="comment"><!--数据库连接信息--></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"driver"</span> <span class="attr">value</span>=<span class="string">"com.mysql.jdbc.Driver"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"url"</span> <span class="attr">value</span>=<span class="string">"jdbc:mysql:///mybatis?useSSL=false"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"username"</span> <span class="attr">value</span>=<span class="string">"root"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"password"</span> <span class="attr">value</span>=<span class="string">"1234"</span>/></span></span><br><span class="line"> <span class="tag"></<span class="name">dataSource</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">environment</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">environment</span> <span class="attr">id</span>=<span class="string">"test"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">transactionManager</span> <span class="attr">type</span>=<span class="string">"JDBC"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">dataSource</span> <span class="attr">type</span>=<span class="string">"POOLED"</span>></span></span><br><span class="line"> <span class="comment"><!--数据库连接信息--></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"driver"</span> <span class="attr">value</span>=<span class="string">"com.mysql.jdbc.Driver"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"url"</span> <span class="attr">value</span>=<span class="string">"jdbc:mysql:///mybatis?useSSL=false"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"username"</span> <span class="attr">value</span>=<span class="string">"root"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"password"</span> <span class="attr">value</span>=<span class="string">"1234"</span>/></span></span><br><span class="line"> <span class="tag"></<span class="name">dataSource</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">environment</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">environments</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">mappers</span>></span></span><br><span class="line"> <span class="comment"><!--加载sql映射文件--></span></span><br><span class="line"> <span class="tag"><<span class="name">mapper</span> <span class="attr">resource</span>=<span class="string">"UserMapper.xml"</span>/></span></span><br><span class="line"> <span class="tag"></<span class="name">mappers</span>></span></span><br><span class="line"><span class="tag"></<span class="name">configuration</span>></span></span><br></pre></td></tr></table></figure> |
|
</li> |
|
<li> |
|
<p>编写 SQL 映射文件 --> 统一管理sql语句，解决硬编码问题</p> |
|
<p>在模块的 <code>resources</code> 目录下创建映射配置文件 <code>UserMapper.xml</code>，内容如下：</p> |
|
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><?xml version=<span class="string">"1.0"</span> encoding=<span class="string">"UTF-8"</span> ?></span></span><br><span class="line"><span class="meta"><!DOCTYPE <span class="keyword">mapper</span> <span class="keyword">PUBLIC</span> <span class="string">"-//mybatis.org//DTD Mapper 3.0//EN"</span> <span class="string">"http://mybatis.org/dtd/mybatis-3-mapper.dtd"</span>></span></span><br><span class="line"><span class="tag"><<span class="name">mapper</span> <span class="attr">namespace</span>=<span class="string">"test"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">select</span> <span class="attr">id</span>=<span class="string">"selectAll"</span> <span class="attr">resultType</span>=<span class="string">"com.itheima.pojo.User"</span>></span></span><br><span class="line"> select * from tb_user;</span><br><span class="line"> <span class="tag"></<span class="name">select</span>></span></span><br><span class="line"><span class="tag"></<span class="name">mapper</span>></span></span><br></pre></td></tr></table></figure> |
|
</li> |
|
<li> |
|
<p>编码</p> |
|
<ul> |
|
<li> |
|
<p>在 <code>com.itheima.pojo</code> 包下创建 User类</p> |
|
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">User</span> {</span><br><span class="line"> <span class="keyword">private</span> <span class="type">int</span> id;</span><br><span class="line"> <span class="keyword">private</span> String username;</span><br><span class="line"> <span class="keyword">private</span> String password;</span><br><span class="line"> <span class="keyword">private</span> String gender;</span><br><span class="line"> <span class="keyword">private</span> String addr;</span><br><span class="line"> </span><br><span class="line"> <span class="comment">//省略了 setter 和 getter</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure> |
|
</li> |
|
<li> |
|
<p>在 <code>com.itheima</code> 包下编写 MybatisDemo 测试类</p> |
|
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">MyBatisDemo</span> {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> IOException {</span><br><span class="line"> <span class="comment">//1. 加载mybatis的核心配置文件，获取 SqlSessionFactory</span></span><br><span class="line"> <span class="type">String</span> <span class="variable">resource</span> <span class="operator">=</span> <span class="string">"mybatis-config.xml"</span>;</span><br><span class="line"> <span class="type">InputStream</span> <span class="variable">inputStream</span> <span class="operator">=</span> Resources.getResourceAsStream(resource);</span><br><span class="line"> <span class="type">SqlSessionFactory</span> <span class="variable">sqlSessionFactory</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">SqlSessionFactoryBuilder</span>().build(inputStream);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//2. 获取SqlSession对象，用它来执行sql</span></span><br><span class="line"> <span class="type">SqlSession</span> <span class="variable">sqlSession</span> <span class="operator">=</span> sqlSessionFactory.openSession();</span><br><span class="line"> <span class="comment">//3. 执行sql</span></span><br><span class="line"> List<User> users = sqlSession.selectList(<span class="string">"test.selectAll"</span>); <span class="comment">//参数是一个字符串，该字符串必须是映射配置文件的namespace.id</span></span><br><span class="line"> System.out.println(users);</span><br><span class="line"> <span class="comment">//4. 释放资源</span></span><br><span class="line"> sqlSession.close();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure> |
|
</li> |
|
</ul> |
|
</li> |
|
</ul> |
|
<p><strong>解决SQL映射文件的警告提示：</strong></p> |
|
<p>在入门案例映射配置文件中存在报红的情况。问题如下：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726212621722.png" alt="image-20210726212621722"></p> |
|
<ul> |
|
<li>产生的原因：Idea和数据库没有建立连接，不识别表信息。但是大家一定要记住，它并不影响程序的执行。</li> |
|
<li>解决方式：在Idea中配置MySQL数据库连接。</li> |
|
</ul> |
|
<p>IDEA中配置MySQL数据库连接</p> |
|
<ul> |
|
<li> |
|
<p>点击IDEA右边框的 <code>Database</code> ，在展开的界面点击 <code>+</code> 选择 <code>Data Source</code> ，再选择 <code>MySQL</code></p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726213046072.png" alt="image-20210726213046072"></p> |
|
</li> |
|
<li> |
|
<p>在弹出的界面进行基本信息的填写</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726213305893.png" alt="image-20210726213305893"></p> |
|
</li> |
|
<li> |
|
<p>点击完成后就能看到如下界面</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726213541418.png" alt="image-20210726213541418"></p> |
|
<p>而此界面就和 <code>navicat</code> 工具一样可以进行数据库的操作。也可以编写SQL语句</p> |
|
</li> |
|
</ul> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726213857620.png" alt="image-20210726213857620"></p> |
|
<h3 id="2-3-Mapper代理开发">2.3 Mapper代理开发</h3> |
|
<h4 id="2-3-1-Mapper代理开发概述">2.3.1 Mapper代理开发概述</h4> |
|
<p>之前我们写的代码是基本使用方式，它也存在硬编码的问题，如下：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726214648112.png" alt="image-20210726214648112"></p> |
|
<p>这里调用 <code>selectList()</code> 方法传递的参数是映射配置文件中的 namespace.id值。这样写也不便于后期的维护。如果使用 Mapper 代理方式（如下图）则不存在硬编码问题。</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726214636108.png" alt="image-20210726214636108"></p> |
|
<p>通过上面的描述可以看出 Mapper 代理方式的目的：</p> |
|
<ul> |
|
<li>解决原生方式中的硬编码</li> |
|
<li>简化后期执行SQL</li> |
|
</ul> |
|
<p>Mybatis 官网也是推荐使用 Mapper 代理的方式。下图是截止官网的图片</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726215339568.png" alt="image-20210726215339568"></p> |
|
<h4 id="2-3-2-使用Mapper代理要求">2.3.2 使用Mapper代理要求</h4> |
|
<p>使用Mapper代理方式，必须满足以下要求：</p> |
|
<ul> |
|
<li> |
|
<p>定义与SQL映射文件同名的Mapper接口，并且将Mapper接口和SQL映射文件放置在同一目录下。如下图：</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726215946951.png" alt="image-20210726215946951"></p> |
|
</li> |
|
<li> |
|
<p>设置SQL映射文件的namespace属性为Mapper接口全限定名</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726220053883.png" alt="image-20210726220053883"></p> |
|
</li> |
|
<li> |
|
<p>在 Mapper 接口中定义方法，方法名就是SQL映射文件中sql语句的id，并保持参数类型和返回值类型一致</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726223216517.png" alt="image-20210726223216517"></p> |
|
</li> |
|
</ul> |
|
<h4 id="2-3-3-案例代码实现">2.3.3 案例代码实现</h4> |
|
<ul> |
|
<li> |
|
<p>在 <code>com.itheima.mapper</code> 包下创建 UserMapper接口，代码如下：</p> |
|
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">interface</span> <span class="title class_">UserMapper</span> {</span><br><span class="line"> List<User> <span class="title function_">selectAll</span><span class="params">()</span>;</span><br><span class="line"> User <span class="title function_">selectById</span><span class="params">(<span class="type">int</span> id)</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure> |
|
</li> |
|
<li> |
|
<p>在 <code>resources</code> 下创建 <code>com/itheima/mapper</code> 目录，并在该目录下创建 UserMapper.xml 映射配置文件</p> |
|
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"><!--</span></span><br><span class="line"><span class="comment"> namespace:名称空间。必须是对应接口的全限定名</span></span><br><span class="line"><span class="comment">--></span></span><br><span class="line"><span class="tag"><<span class="name">mapper</span> <span class="attr">namespace</span>=<span class="string">"com.itheima.mapper.UserMapper"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">select</span> <span class="attr">id</span>=<span class="string">"selectAll"</span> <span class="attr">resultType</span>=<span class="string">"com.itheima.pojo.User"</span>></span></span><br><span class="line"> select *</span><br><span class="line"> from tb_user;</span><br><span class="line"> <span class="tag"></<span class="name">select</span>></span></span><br><span class="line"><span class="tag"></<span class="name">mapper</span>></span></span><br></pre></td></tr></table></figure> |
|
</li> |
|
<li> |
|
<p>在 <code>com.itheima</code> 包下创建 MybatisDemo2 测试类，代码如下：</p> |
|
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Mybatis 代理开发</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">MyBatisDemo2</span> {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> IOException {</span><br><span class="line"></span><br><span class="line"> <span class="comment">//1. 加载mybatis的核心配置文件，获取 SqlSessionFactory</span></span><br><span class="line"> <span class="type">String</span> <span class="variable">resource</span> <span class="operator">=</span> <span class="string">"mybatis-config.xml"</span>;</span><br><span class="line"> <span class="type">InputStream</span> <span class="variable">inputStream</span> <span class="operator">=</span> Resources.getResourceAsStream(resource);</span><br><span class="line"> <span class="type">SqlSessionFactory</span> <span class="variable">sqlSessionFactory</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">SqlSessionFactoryBuilder</span>().build(inputStream);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//2. 获取SqlSession对象，用它来执行sql</span></span><br><span class="line"> <span class="type">SqlSession</span> <span class="variable">sqlSession</span> <span class="operator">=</span> sqlSessionFactory.openSession();</span><br><span class="line"> <span class="comment">//3. 执行sql</span></span><br><span class="line"> <span class="comment">//3.1 获取UserMapper接口的代理对象</span></span><br><span class="line"> <span class="type">UserMapper</span> <span class="variable">userMapper</span> <span class="operator">=</span> sqlSession.getMapper(UserMapper.class);</span><br><span class="line"> List<User> users = userMapper.selectAll();</span><br><span class="line"></span><br><span class="line"> System.out.println(users);</span><br><span class="line"> <span class="comment">//4. 释放资源</span></span><br><span class="line"> sqlSession.close();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure> |
|
</li> |
|
</ul> |
|
<p>==注意：==</p> |
|
<p>如果Mapper接口名称和SQL映射文件名称相同，并在同一目录下，则可以使用包扫描的方式简化SQL映射文件的加载。也就是将核心配置文件的加载映射配置文件的配置修改为</p> |
|
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">mappers</span>></span></span><br><span class="line"> <span class="comment"><!--加载sql映射文件--></span></span><br><span class="line"> <span class="comment"><!-- <mapper resource="com/itheima/mapper/UserMapper.xml"/>--></span></span><br><span class="line"> <span class="comment"><!--Mapper代理方式--></span></span><br><span class="line"> <span class="tag"><<span class="name">package</span> <span class="attr">name</span>=<span class="string">"com.itheima.mapper"</span>/></span></span><br><span class="line"><span class="tag"></<span class="name">mappers</span>></span></span><br></pre></td></tr></table></figure> |
|
<h3 id="2-4-核心配置文件">2.4 核心配置文件</h3> |
|
<p>核心配置文件中现有的配置之前已经给大家进行了解释，而核心配置文件中还可以配置很多内容。我们可以通过查询官网看可以配置的内容</p> |
|
<p><img src="https://imgs-1302910354.cos.ap-shanghai.myqcloud.com/images/image-20210726221454927.png" alt="image-20210726221454927"></p> |
|
<p>接下来我们先对里面的一些配置进行讲解。</p> |
|
<h4 id="2-4-1-多环境配置">2.4.1 多环境配置</h4> |
|
<p>在核心配置文件的 <code>environments</code> 标签中其实是可以配置多个 <code>environment</code> ，使用 <code>id</code> 给每段环境起名，在 <code>environments</code> 中使用 <code>default='环境id'</code> 来指定使用哪儿段配置。我们一般就配置一个 <code>environment</code> 即可。</p> |
|
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">environments</span> <span class="attr">default</span>=<span class="string">"development"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">environment</span> <span class="attr">id</span>=<span class="string">"development"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">transactionManager</span> <span class="attr">type</span>=<span class="string">"JDBC"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">dataSource</span> <span class="attr">type</span>=<span class="string">"POOLED"</span>></span></span><br><span class="line"> <span class="comment"><!--数据库连接信息--></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"driver"</span> <span class="attr">value</span>=<span class="string">"com.mysql.jdbc.Driver"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"url"</span> <span class="attr">value</span>=<span class="string">"jdbc:mysql:///mybatis?useSSL=false"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"username"</span> <span class="attr">value</span>=<span class="string">"root"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"password"</span> <span class="attr">value</span>=<span class="string">"1234"</span>/></span></span><br><span class="line"> <span class="tag"></<span class="name">dataSource</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">environment</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">environment</span> <span class="attr">id</span>=<span class="string">"test"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">transactionManager</span> <span class="attr">type</span>=<span class="string">"JDBC"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">dataSource</span> <span class="attr">type</span>=<span class="string">"POOLED"</span>></span></span><br><span class="line"> <span class="comment"><!--数据库连接信息--></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"driver"</span> <span class="attr">value</span>=<span class="string">"com.mysql.jdbc.Driver"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"url"</span> <span class="attr">value</span>=<span class="string">"jdbc:mysql:///mybatis?useSSL=false"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"username"</span> <span class="attr">value</span>=<span class="string">"root"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"password"</span> <span class="attr">value</span>=<span class="string">"1234"</span>/></span></span><br><span class="line"> <span class="tag"></<span class="name">dataSource</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">environment</span>></span></span><br><span class="line"><span class="tag"></<span class="name">environments</span>></span>=</span><br></pre></td></tr></table></figure> |
|
<h4 id="2-4-2-类型别名">2.4.2 类型别名</h4> |
|
<p>在映射配置文件中的 <code>resultType</code> 属性需要配置数据封装的类型（类的全限定名）。而每次这样写是特别麻烦的，Mybatis 提供了 <code>类型别名</code>(typeAliases) 可以简化这部分的书写。</p> |
|
<p>首先需要现在核心配置文件中配置类型别名，也就意味着给pojo包下所有的类起了别名（别名就是类名），不区分大小写。内容如下：</p> |
|
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">typeAliases</span>></span></span><br><span class="line"> <span class="comment"><!--name属性的值是实体类所在包--></span></span><br><span class="line"> <span class="tag"><<span class="name">package</span> <span class="attr">name</span>=<span class="string">"com.itheima.pojo"</span>/></span> </span><br><span class="line"><span class="tag"></<span class="name">typeAliases</span>></span></span><br></pre></td></tr></table></figure> |
|
<p>通过上述的配置，我们就可以简化映射配置文件中 <code>resultType</code> 属性值的编写</p> |
|
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">mapper</span> <span class="attr">namespace</span>=<span class="string">"com.itheima.mapper.UserMapper"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">select</span> <span class="attr">id</span>=<span class="string">"selectAll"</span> <span class="attr">resultType</span>=<span class="string">"user"</span>></span></span><br><span class="line"> select * from tb_user;</span><br><span class="line"> <span class="tag"></<span class="name">select</span>></span></span><br><span class="line"><span class="tag"></<span class="name">mapper</span>></span></span><br></pre></td></tr></table></figure> |
|
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="https://ismaxu.com">Ruoneo</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://ismaxu.com/2017/08/23/Maven&MyBatis/">https://ismaxu.com/2017/08/23/Maven&MyBatis/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://ismaxu.com" target="_blank">水榭听泉</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/%E5%90%8E%E7%AB%AF/">后端</a><a class="post-meta__tags" href="/tags/%E6%95%B0%E6%8D%AE%E5%BA%93%E9%A9%B1%E5%8A%A8/">数据库驱动</a><a class="post-meta__tags" href="/tags/%E6%95%B0%E6%8D%AE%E6%8C%81%E4%B9%85%E5%8C%96/">数据持久化</a><a class="post-meta__tags" href="/tags/Mybatis/">Mybatis</a><a class="post-meta__tags" href="/tags/%E5%90%8E%E7%AB%AF%E6%A1%86%E6%9E%B6/">后端框架</a><a class="post-meta__tags" href="/tags/%E6%A1%86%E6%9E%B6/">框架</a><a class="post-meta__tags" href="/tags/%E9%A1%B9%E7%9B%AE%E7%AE%A1%E7%90%86/">项目管理</a><a class="post-meta__tags" href="/tags/%E9%A1%B9%E7%9B%AE%E6%9E%84%E5%BB%BA%E5%B7%A5%E5%85%B7/">项目构建工具</a></div><div class="post_share"><div class="social-share" data-image="https://i.loli.net/2020/05/01/gkihqEjXxJ5UZ1C.jpg" data-sites="facebook,twitter,wechat,weibo,qq"></div><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/butterfly-extsrc/sharejs/dist/css/share.min.css" media="print" onload="this.media='all'"><script src="https://cdn.jsdelivr.net/npm/butterfly-extsrc/sharejs/dist/js/social-share.min.js" defer></script></div></div><nav class="pagination-post" id="pagination"><div class="prev-post pull-left"><a href="/2017/09/10/Mybatis/"><img class="prev-cover" src="https://i.loli.net/2020/05/01/gkihqEjXxJ5UZ1C.jpg" onerror="onerror=null;src='/img/404.jpg'" alt="cover of previous post"><div class="pagination-info"><div class="label">上一篇</div><div class="prev_info">Mybatis</div></div></a></div><div class="next-post pull-right"><a href="/2017/08/16/druid%E9%85%8D%E7%BD%AE%E8%AF%A6%E8%A7%A3/"><img class="next-cover" src="https://i.loli.net/2020/05/01/gkihqEjXxJ5UZ1C.jpg" onerror="onerror=null;src='/img/404.jpg'" alt="cover of next post"><div class="pagination-info"><div class="label">下一篇</div><div class="next_info">druid配置详解</div></div></a></div></nav><hr/><div id="post-comment"><div class="comment-head"><div class="comment-headline"><i class="fas fa-comments fa-fw"></i><span> 评论</span></div><div id="comment-switch"><span class="first-comment">Twikoo</span><span class="switch-btn"></span><span class="second-comment">Gitalk</span></div></div><div class="comment-wrap"><div><div id="twikoo-wrap"></div></div><div><div id="gitalk-container"></div></div></div></div></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src="/img/avatar.jpg" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"/></div><div class="author-info__name">Ruoneo</div><div class="author-info__description">嗨! 你好!</div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">64</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">26</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">4</div></a></div><div class="card-info-social-icons is-center"><a class="social-icon" href="https://github.com/ruoneo" target="_blank" title="Github"><i class="fab fa-github"></i></a><a class="social-icon" href="mailto:xum321@gmail.com" target="_blank" title="Email"><i class="fas fa-envelope"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">感谢来访。希望这里有对你有帮助的内容。</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#Maven-MyBatis"><span class="toc-number">1.</span> <span class="toc-text">Maven&MyBatis</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#1%EF%BC%8CMaven"><span class="toc-number">2.</span> <span class="toc-text">1，Maven</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-1-Maven%E7%AE%80%E4%BB%8B"><span class="toc-number">2.1.</span> <span class="toc-text">1.1 Maven简介</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-1-1-Maven%E6%A8%A1%E5%9E%8B"><span class="toc-number">2.1.1.</span> <span class="toc-text">1.1.1 Maven模型</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-1-2-%E4%BB%93%E5%BA%93"><span class="toc-number">2.1.2.</span> <span class="toc-text">1.1.2 仓库</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-2-Maven%E5%AE%89%E8%A3%85%E9%85%8D%E7%BD%AE"><span class="toc-number">2.2.</span> <span class="toc-text">1.2 Maven安装配置</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-3-Maven%E5%9F%BA%E6%9C%AC%E4%BD%BF%E7%94%A8"><span class="toc-number">2.3.</span> <span class="toc-text">1.3 Maven基本使用</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-3-1-Maven-%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4"><span class="toc-number">2.3.1.</span> <span class="toc-text">1.3.1 Maven 常用命令</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-3-2-Maven-%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F"><span class="toc-number">2.3.2.</span> <span class="toc-text">1.3.2 Maven 生命周期</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-4-IDEA%E4%BD%BF%E7%94%A8Maven"><span class="toc-number">2.4.</span> <span class="toc-text">1.4 IDEA使用Maven</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-4-1-IDEA%E9%85%8D%E7%BD%AEMaven%E7%8E%AF%E5%A2%83"><span class="toc-number">2.4.1.</span> <span class="toc-text">1.4.1 IDEA配置Maven环境</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-4-2-Maven-%E5%9D%90%E6%A0%87%E8%AF%A6%E8%A7%A3"><span class="toc-number">2.4.2.</span> <span class="toc-text">1.4.2 Maven 坐标详解</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-4-3-IDEA-%E5%88%9B%E5%BB%BA-Maven%E9%A1%B9%E7%9B%AE"><span class="toc-number">2.4.3.</span> <span class="toc-text">1.4.3 IDEA 创建 Maven项目</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-4-4-IDEA-%E5%AF%BC%E5%85%A5-Maven%E9%A1%B9%E7%9B%AE"><span class="toc-number">2.4.4.</span> <span class="toc-text">1.4.4 IDEA 导入 Maven项目</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-5-%E4%BE%9D%E8%B5%96%E7%AE%A1%E7%90%86"><span class="toc-number">2.5.</span> <span class="toc-text">1.5 依赖管理</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-5-1-%E4%BD%BF%E7%94%A8%E5%9D%90%E6%A0%87%E5%BC%95%E5%85%A5jar%E5%8C%85"><span class="toc-number">2.5.1.</span> <span class="toc-text">1.5.1 使用坐标引入jar包</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-5-2-%E4%BE%9D%E8%B5%96%E8%8C%83%E5%9B%B4"><span class="toc-number">2.5.2.</span> <span class="toc-text">1.5.2 依赖范围</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2%EF%BC%8CMybatis"><span class="toc-number">3.</span> <span class="toc-text">2，Mybatis</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#2-1-Mybatis%E6%A6%82%E8%BF%B0"><span class="toc-number">3.1.</span> <span class="toc-text">2.1 Mybatis概述</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#2-1-1-Mybatis%E6%A6%82%E5%BF%B5"><span class="toc-number">3.1.1.</span> <span class="toc-text">2.1.1 Mybatis概念</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-1-2-JDBC-%E7%BC%BA%E7%82%B9"><span class="toc-number">3.1.2.</span> <span class="toc-text">2.1.2 JDBC 缺点</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-1-3-Mybatis-%E4%BC%98%E5%8C%96"><span class="toc-number">3.1.3.</span> <span class="toc-text">2.1.3 Mybatis 优化</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-2-Mybatis%E5%BF%AB%E9%80%9F%E5%85%A5%E9%97%A8"><span class="toc-number">3.2.</span> <span class="toc-text">2.2 Mybatis快速入门</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-3-Mapper%E4%BB%A3%E7%90%86%E5%BC%80%E5%8F%91"><span class="toc-number">3.3.</span> <span class="toc-text">2.3 Mapper代理开发</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#2-3-1-Mapper%E4%BB%A3%E7%90%86%E5%BC%80%E5%8F%91%E6%A6%82%E8%BF%B0"><span class="toc-number">3.3.1.</span> <span class="toc-text">2.3.1 Mapper代理开发概述</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-3-2-%E4%BD%BF%E7%94%A8Mapper%E4%BB%A3%E7%90%86%E8%A6%81%E6%B1%82"><span class="toc-number">3.3.2.</span> <span class="toc-text">2.3.2 使用Mapper代理要求</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-3-3-%E6%A1%88%E4%BE%8B%E4%BB%A3%E7%A0%81%E5%AE%9E%E7%8E%B0"><span class="toc-number">3.3.3.</span> <span class="toc-text">2.3.3 案例代码实现</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-4-%E6%A0%B8%E5%BF%83%E9%85%8D%E7%BD%AE%E6%96%87%E4%BB%B6"><span class="toc-number">3.4.</span> <span class="toc-text">2.4 核心配置文件</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#2-4-1-%E5%A4%9A%E7%8E%AF%E5%A2%83%E9%85%8D%E7%BD%AE"><span class="toc-number">3.4.1.</span> <span class="toc-text">2.4.1 多环境配置</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-4-2-%E7%B1%BB%E5%9E%8B%E5%88%AB%E5%90%8D"><span class="toc-number">3.4.2.</span> <span class="toc-text">2.4.2 类型别名</span></a></li></ol></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/2024/07/06/git%E5%B1%80%E5%9F%9F%E7%BD%91%E9%83%A8%E7%BD%B2%E6%96%B9%E6%B3%95/" title="git局域网部署方法">git局域网部署方法</a><time datetime="2024-07-06T08:13:10.000Z" title="发表于 2024-07-06 16:13:10">2024-07-06</time></div></div><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/2023/09/25/%E5%85%B3%E4%BA%8EPyQt%E7%9A%84connect%E4%BC%A0%E5%85%A5lambda%E5%87%BD%E6%95%B0%E4%BD%9C%E4%B8%BA%E5%8F%82%E6%95%B0%E8%B0%83%E7%94%A8%E6%A7%BD%E5%87%BD%E6%95%B0%E7%9A%84%E4%B8%80%E7%82%B9%E6%80%9D%E8%80%83/" title="关于PyQt的connect传入lambda函数作为参数调用槽函数的一点思考">关于PyQt的connect传入lambda函数作为参数调用槽函数的一点思考</a><time datetime="2023-09-25T13:53:35.000Z" title="发表于 2023-09-25 21:53:35">2023-09-25</time></div></div><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/2022/03/30/%E5%A4%8D%E4%B9%A05/" title="Spring注解">Spring注解</a><time datetime="2022-03-30T07:22:16.000Z" title="发表于 2022-03-30 15:22:16">2022-03-30</time></div></div><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/2022/03/30/%E5%A4%8D%E4%B9%A04/" title="Spring">Spring</a><time datetime="2022-03-30T02:23:10.000Z" title="发表于 2022-03-30 10:23:10">2022-03-30</time></div></div><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/2022/03/22/MultiDTI_%20drug%E2%80%93target%20interaction%20prediction%20based%20on%20multi-modal%20representation%20learning%20to%20bridge%20the%20gap%20between%20new%20chemical/" title="MultiDTI_ drug–target interaction prediction based on multi-modal representation learning to bridge the gap between new chemical">MultiDTI_ drug–target interaction prediction based on multi-modal representation learning to bridge the gap between new chemical</a><time datetime="2022-03-22T06:29:57.000Z" title="发表于 2022-03-22 14:29:57">2022-03-22</time></div></div></div></div></div></div></main><footer id="footer" style="background: color(orange)"><div id="footer-wrap"><div class="copyright">©2024 By Ruoneo</div><div class="footer_custom_text"><div><a target="_blank" rel="noopener" href="https://beian.miit.gov.cn"><img class="icp-icon"><span>豫ICP备 2022020326号</span></a> | <a target="_blank" rel="noopener" href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=41020202000143"><span>豫公网安备 41020202000143号</span></a></div></div></div></footer></div><div id="rightside"><div id="rightside-config-hide"><button id="readmode" type="button" title="阅读模式"><i class="fas fa-book-open"></i></button><button id="darkmode" type="button" title="浅色和深色模式转换"><i class="fas fa-adjust"></i></button><button id="hide-aside-btn" type="button" title="单栏和双栏切换"><i class="fas fa-arrows-alt-h"></i></button></div><div id="rightside-config-show"><button id="rightside_config" type="button" title="设置"><i class="fas fa-cog fa-spin"></i></button><button class="close" id="mobile-toc-button" type="button" title="目录"><i class="fas fa-list-ul"></i></button><a id="to_comment" href="#post-comment" title="直达评论"><i class="fas fa-comments"></i></a><button id="go-up" type="button" title="回到顶部"><i class="fas fa-arrow-up"></i></button></div></div><div id="local-search"><div class="search-dialog"><nav class="search-nav"><span class="search-dialog-title">搜索</span><span id="loading-status"></span><button class="search-close-button"><i class="fas fa-times"></i></button></nav><div class="is-center" id="loading-database"><i class="fas fa-spinner fa-pulse"></i><span> 数据库加载中</span></div><div class="search-wrap"><div id="local-search-input"><div class="local-search-box"><input class="local-search-box--input" placeholder="搜索文章" type="text"/></div></div><hr/><div id="local-search-results"></div></div></div><div id="search-mask"></div></div><div><script src="/js/utils.js"></script><script src="/js/main.js"></script><script src="https://cdn.jsdelivr.net/npm/@fancyapps/ui/dist/fancybox.umd.min.js"></script><script src="https://cdn.jsdelivr.net/npm/vanilla-lazyload/dist/lazyload.iife.min.js"></script><script src="/js/search/local-search.js"></script><div class="js-pjax"><script>(()=>{ |
|
const init = () => { |
|
twikoo.init(Object.assign({ |
|
el: '#twikoo-wrap', |
|
envId: 'https://tk.ismaxu.com', |
|
region: '', |
|
onCommentLoaded: function () { |
|
btf.loadLightbox(document.querySelectorAll('#twikoo .tk-content img:not(.tk-owo-emotion)')) |
|
} |
|
}, null)) |
|
} |
|
|
|
const getCount = () => { |
|
const countELement = document.getElementById('twikoo-count') |
|
if(!countELement) return |
|
twikoo.getCommentsCount({ |
|
envId: 'https://tk.ismaxu.com', |
|
region: '', |
|
urls: [window.location.pathname], |
|
includeReply: false |
|
}).then(function (res) { |
|
countELement.innerText = res[0].count |
|
}).catch(function (err) { |
|
console.error(err); |
|
}); |
|
} |
|
|
|
const runFn = () => { |
|
init() |
|
|
|
} |
|
|
|
const loadTwikoo = () => { |
|
if (typeof twikoo === 'object') { |
|
setTimeout(runFn,0) |
|
return |
|
} |
|
getScript('https://cdn.jsdelivr.net/npm/twikoo/dist/twikoo.all.min.js').then(runFn) |
|
} |
|
|
|
if ('Twikoo' === 'Twikoo' || !false) { |
|
if (false) btf.loadComment(document.getElementById('twikoo-wrap'), loadTwikoo) |
|
else loadTwikoo() |
|
} else { |
|
window.loadOtherComment = () => { |
|
loadTwikoo() |
|
} |
|
} |
|
})()</script><script>function addGitalkSource () { |
|
const ele = document.createElement('link') |
|
ele.rel = 'stylesheet' |
|
ele.href= 'https://cdn.jsdelivr.net/npm/gitalk/dist/gitalk.min.css' |
|
document.getElementsByTagName('head')[0].appendChild(ele) |
|
} |
|
|
|
function loadGitalk () { |
|
function initGitalk () { |
|
var gitalk = new Gitalk(Object.assign({ |
|
clientID: 'f9bab17720653ab07b39', |
|
clientSecret: 'e77fbcac5c4043ddf8d845aee7d6d5f118f607e2', |
|
repo: 'ruoneo-comment-repo', |
|
owner: 'ruoneo', |
|
admin: ['ruoneo'], |
|
id: '7c21a47af52865db442b3b7ab595bc2e', |
|
updateCountCallback: commentCount |
|
},null)) |
|
|
|
gitalk.render('gitalk-container') |
|
} |
|
|
|
if (typeof Gitalk === 'function') initGitalk() |
|
else { |
|
addGitalkSource() |
|
getScript('https://cdn.jsdelivr.net/npm/gitalk/dist/gitalk.min.js').then(initGitalk) |
|
} |
|
} |
|
|
|
function commentCount(n){ |
|
let isCommentCount = document.querySelector('#post-meta .gitalk-comment-count') |
|
if (isCommentCount) { |
|
isCommentCount.innerHTML= n |
|
} |
|
} |
|
|
|
if ('Twikoo' === 'Gitalk' || !false) { |
|
if (false) btf.loadComment(document.getElementById('gitalk-container'), loadGitalk) |
|
else loadGitalk() |
|
} else { |
|
function loadOtherComment () { |
|
loadGitalk() |
|
} |
|
}</script></div></div></body></html> |