wechatbak/wjj-core/src/main/resources/mybatis/ExplainMapper.xml

<?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="com.demo.wjj.mapper.ExplainMapper">

    <!--查询-->
    <select id="selectExplain" resultType="com.demo.wjj.po.Explain">
        select  *
        from tb_explain
    </select>
</mapper>