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<!DOCTYPE HTML>
<html lang="zh-CN">
<head><meta name="generator" content="Hexo 3.9.0">
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<meta name="keywords" content="Mybatis, 记录">
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<meta name="description" content="依赖Maven
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&lt;groupId&gt;org.mybatis&lt;/groupId&gt;
&lt;artifactId&gt;mybatis&lt;/artifactId&gt;
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<title>Mybatis | Ji`s Blog</title>
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<script>
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</script></head>
<div id="loading-container">
<p class="loading-text"></p>
<div class="loading-image">
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>
</div><body>
<header class="navbar-fixed">
<nav id="headNav" class="bg-color nav-transparent">
<div id="navContainer" class="nav-wrapper container">
<div class="brand-logo">
<a href="/" class="waves-effect waves-light">
<img src="/medias/logo.png" class="logo-img" alt="LOGO">
<span class="logo-span">Ji`s Blog</span>
</a>
</div>
<a href="#" data-target="mobile-nav" class="sidenav-trigger button-collapse"><i class="fa fa-navicon"></i></a>
<ul class="right">
<li class="hide-on-med-and-down">
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<span>首页</span>
</a>
</li>
<li class="hide-on-med-and-down">
<a href="/tags" class="waves-effect waves-light">
<span>标签</span>
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</li>
<li class="hide-on-med-and-down">
<a href="/categories" class="waves-effect waves-light">
<span>分类</span>
</a>
</li>
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</a>
</li>
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<span>关于</span>
</a>
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<span>友情链接</span>
</a>
</li>
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<span>留言板</span>
</a>
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<i id="searchIcon" class="fa fa-search" title="搜索"></i>
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<h1 id="依赖"><a href="#依赖" class="headerlink" title="依赖"></a>依赖</h1><p>Maven</p>
<pre><code><dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>x.x.x</version>
</dependency></code></pre><h3 id="从-XML-中构建-SqlSessionFactory"><a href="#从-XML-中构建-SqlSessionFactory" class="headerlink" title="从 XML 中构建 SqlSessionFactory"></a>从 XML 中构建 SqlSessionFactory</h3><p>每个基于 MyBatis 的应用都是以一个 SqlSessionFactory 的实例为核心的。SqlSessionFactory 的实例可以通过 SqlSessionFactoryBuilder 获得。而 SqlSessionFactoryBuilder 则可以从 XML 配置文件或一个预先配置的 Configuration 实例来构建出 SqlSessionFactory 实例。</p>
<p>从 XML 文件中构建 SqlSessionFactory 的实例非常简单，建议使用类路径下的资源文件进行配置。 但也可以使用任意的输入流（InputStream）实例，比如用文件路径字符串或 file:// URL 构造的输入流。MyBatis 包含一个名叫 Resources 的工具类，它包含一些实用方法，使得从类路径或其它位置加载资源文件更加容易。</p>
<pre><code>String resource = "org/mybatis/example/mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);</code></pre><p>XML 配置文件中包含了对 MyBatis 系统的核心设置，包括获取数据库连接实例的数据源（DataSource）以及决定事务作用域和控制方式的事务管理器（TransactionManager）</p>
<pre><code><?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
</configuration></code></pre><h3 id="不使用-XML-构建-SqlSessionFactory"><a href="#不使用-XML-构建-SqlSessionFactory" class="headerlink" title="不使用 XML 构建 SqlSessionFactory"></a>不使用 XML 构建 SqlSessionFactory</h3><pre><code>DataSource dataSource = BlogDataSourceFactory.getBlogDataSource();
TransactionFactory transactionFactory = new JdbcTransactionFactory();
Environment environment = new Environment("development", transactionFactory, dataSource);
Configuration configuration = new Configuration(environment);
configuration.addMapper(BlogMapper.class);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(configuration);</code></pre><h1 id="命名空间（Namespaces）"><a href="#命名空间（Namespaces）" class="headerlink" title="命名空间（Namespaces）"></a>命名空间（Namespaces）</h1><h1 id="配置"><a href="#配置" class="headerlink" title="配置"></a>配置</h1><h2 id="属性（properties）"><a href="#属性（properties）" class="headerlink" title="属性（properties）"></a>属性（properties）</h2><p>这些属性可以在外部进行配置，并可以进行动态替换</p>
<pre><code><properties resource="org/mybatis/example/config.properties">
<property name="username" value="dev_user"/>
<property name="password" value="F2Fa3!33TYyg"/>
</properties></code></pre><p>设置好的属性可以在整个配置文件中用来替换需要动态配置的属性值。比如:</p>
<pre><code><dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource></code></pre><p>个例子中的 username 和 password 将会由 properties 元素中设置的相应值来替换。 driver 和 url 属性将会由 config.properties 文件中对应的值来替换。这样就为配置提供了诸多灵活选择。</p>
<p>也可以在 SqlSessionFactoryBuilder.build() 方法中传入属性值。例如：</p>
<pre><code>SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader, props);
// ... 或者 ...
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader, environment, props);</code></pre><p>如果一个属性在不只一个地方进行了配置，那么，MyBatis 将按照下面的顺序来加载：</p>
<ul>
<li>首先读取在 properties 元素体内指定的属性。</li>
<li>然后根据 properties 元素中的 resource 属性读取类路径下属性文件，或根据 url 属性指定的路径读取属性文件，并覆盖之前读取过的同名属性。</li>
<li>最后读取作为方法参数传递的属性，并覆盖之前读取过的同名属性。</li>
</ul>
<p>因此，通过方法参数传递的属性具有最高优先级，resource/url 属性中指定的配置文件次之，最低优先级的则是 properties 元素中指定的属性。</p>
<p>从 MyBatis 3.4.2 开始，你可以为占位符指定一个默认值。例如：</p>
<pre><code><dataSource type="POOLED">
<!-- ... -->
<property name="username" value="${username:ut_user}"/> <!-- 如果属性 'username' 没有被配置，'username' 属性的值将为 'ut_user' -->
</dataSource></code></pre><p>这个特性默认是关闭的。要启用这个特性，需要添加一个特定的属性来开启这个特性。例如：</p>
<pre><code><properties resource="org/mybatis/example/config.properties">
<!-- ... -->
<property name="org.apache.ibatis.parsing.PropertyParser.enable-default-value" value="true"/> <!-- 启用默认值特性 -->
</properties></code></pre><p><strong>提示</strong> 如果你在属性名中使用了 <code>":"</code> 字符（如：<code>db:username</code>），或者在 SQL 映射中使用了 OGNL 表达式的三元运算符（如： <code>${tableName != null ? tableName : 'global_constants'}</code>），就需要设置特定的属性来修改分隔属性名和默认值的字符。例如：</p>
<pre><code><properties resource="org/mybatis/example/config.properties">
<!-- ... -->
<property name="org.apache.ibatis.parsing.PropertyParser.default-value-separator" value="?:"/> <!-- 修改默认值的分隔符 -->
</properties>
<dataSource type="POOLED">
<!-- ... -->
<property name="username" value="${db:username?:ut_user}"/>
</dataSource></code></pre><h1 id="association和collection"><a href="#association和collection" class="headerlink" title="association和collection"></a>association和collection</h1><p>association用于一对一、多对一场景使用。</p>
<p>PoJo</p>
<pre><code>public class Book{
private Integer id;
private String name;
private String type;
private Integer shelfId;
private BookShelf bookShelfDto;
}</code></pre><pre><code>public class BookShelf {
private Integer id;
private String number;
private String num;
}</code></pre><p>mapper</p>
<pre><code><resultMap id="bookResultMap" type="com.abc.Book">
<id property="id" column="id"/>
<result property="name" column="name"/>
<result property="type" column="type"/>
<!--关联属性-->
<association property="bookShelfDto" javaType="com.abc.BookShelf">
<id property="id" column="shelf_id"/>
<result property="number" column="number"/>
<result property="num" column="num"/>
</association>
</resultMap>
<select id="getBookInfo" resultMap="bookResultMap">
select book.id,book.name,book.type,book.shelf_id,shelf.number,shelf.num
from book left join book_shelf shelf on book.shelf_id = shelf.id
where book.id = #{id}
</select></code></pre><h3 id="collection"><a href="#collection" class="headerlink" title="collection"></a>collection</h3><p>应用场景为一对多关系，即实体里放集合。</p>
<p>表不变</p>
<p>现有需求：根据书架ID查询书架信息及书架存放的书籍信息。</p>
<p>POJO</p>
<pre><code>public class Book{
private Integer id;
private String name;
private String type;
private Integer shelfId;
}</code></pre><pre><code>public class BookShelf {
private Integer id;
private String number;
private String num;
private List<Book> bookList;
}</code></pre><pre><code><resultMap id="bookShelfResultMap" type="com.abc.BookShelf">
<id property="id" column="shelf_id"/>
<result property="number" column="number"/>
<result property="num" column="num"/>
<!--关联属性-->
<collection property="bookList" javaType="com.abc.Book">
<id property="id" column="id"/>
<result property="name" column="name"/>
<result property="type" column="type"/>
</collection>
</resultMap>
<select id="getBookShelfInfo" resultMap="bookShelfResultMap">
select book.id,book.name,book.type,book.shelf_id,shelf.number,shelf.num
from book left join book_shelf shelf on book.shelf_id = shelf.id
where shelf.id = #{id}
</select>
Mapper.java
BookShelf getBookShelfInfo(Integer id);</code></pre>
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