wzj-boot/ruoyi-modules/ruoyi-demo/src/main/resources/mapper/demo/TestDemoMapper.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="org.dromara.demo.mapper.TestDemoMapper">

    <select id="customPageList" resultType="org.dromara.demo.domain.vo.TestDemoVo">
        SELECT * FROM test_demo ${ew.customSqlSegment}
    </select>

</mapper>