first commit

src/main/resources/mapper/sys/SysConfigDao.xml

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+<?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.peanut.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.peanut.modules.sys.entity.SysConfigEntity">
+		select * from sys_config where param_key = #{paramKey}
+	</select>
+	
+</mapper>