xml配置文件模板

<?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.at.attendance.mapper.ManagerMapper">
    <!--  动态SQL更新manager  -->
   <update id="update">
       update manager
       <set>
           <if test="mname != null">
               mname = #{mname},
           </if>
           <if test="mpassword != null">
               mpassword = #{mpassword}
           </if>
       </set>
       <where>
           mid = #{mid}
       </where>
   </update>
</mapper>