wechatbak/wjj-core/src/main/resources/mybatis/DemoMapper.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.DemoMapper">

    <!--查询demo-->
    <select id="select" resultType="com.demo.wjj.po.Demo">
        SELECT *
        FROM demo
    </select>
</mapper>