<?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.devplatform.admin.modules.sys.dao.SysConfigDao"> <!-- 根据key,更新value --> <update id="updateValueByKey" parameterType="map"> update sys_config set param_value = #{paramValue} where param_key = #{paramKey} </update> <!-- 根据key,查询value --> <select id="queryByKey" parameterType="string" resultType="com.devplatform.admin.modules.sys.bean.SysConfigEntity"> select * from sys_config where param_key = #{paramKey} </select> </mapper>