Mybatis常用配置

最新推荐文章于 2025-12-23 17:37:35 发布

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#后端

本文详细解读了Mybatis的配置文件，包括如何设置数据库连接池（POOLED），指定开发环境，以及UserMapper的定义。重点介绍了XML配置的'三步走'过程：资源加载、SqlSessionFactory构建和Mapper获取。

配置资源

<?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>
    <typeAliases>
        <package name="com.xiaoli.pojo"/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="mysql"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper class="com.xiaoli.mapper.UserMapper"/>
    </mappers>
</configuration>

mapper配置

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.xiaoli.mapper.UserMapper">   
</mapper>

一般为“三步走”

String resources="mybatis-config.xml";
InputStream in = Resources.getResourceAsStream(resources);
SqlSessionFactory build = new SqlSessionFactoryBuilder().build(in);
SqlSession sqlSession = build.openSession(true);
UserMapper mapper = sqlSession.getMapper(UserMapper.class);