mapper
User selectNickNameAndUserId(@Param(Constants.WRAPPER) LambdaQueryWrapper<User> queryWrapper);
mapper.xml
<select id="selectNickNameAndUserId" resultType="com.example.demo.entity.User">
select
<if test="ew != null and ew.SqlSelect != null and ew.SqlSelect != ''">
${ew.SqlSelect}
</if>
from
user
${ew.customSqlSegment}
</select>