MyBatis入门

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从 XML 中构建 SqlSessionFactory

1. 入门

XML 配置文件示例

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configuration  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"  "http://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>

从 XML 中构建 SqlSessionFactory

MyBatis 包含一个叫 Resources 的工具类，它包含一些静态方法，可使从 classpath 或其他位置加载资源文件更容易。

String resource = "org/mybatis/example/mybatis-config.xml";InputStream inputStream = Resources.getResourceAsStream(resource);sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

配置映射

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"  "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="org.mybatis.example.BlogMapper">  <select id="selectBlog" resultType="Blog">    select * from Blog where id = #{id}  </select></mapper>

从 SqlSessionFactory 中获取 SqlSession

SqlSession session = sqlSessionFactory.openSession();try {  BlogMapper mapper = session.getMapper(BlogMapper.class);  Blog blog = mapper.selectBlog(101);} finally {  session.close();}

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