<?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="io.renren.modules.sys.dao.SysUserDao"> <select id="queryByUserName" resultType="io.renren.modules.sys.entity.SysUserEntity"> select * from sys_user where username = #{username} </select> </mapper>