ADD file via upload

UserMapper.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文件相当于DAO接口的“实现类”，namespace属性要指定“实现”DAO接口的全限定名 -->
+<mapper namespace="com.example.web.UserDao">
+        <insert id="insert" parameterType="com.example.web.User1">
+                insert into user1(username,password) values(#{username},#{password})
+        </insert>
+ 
+        <update id="updateUser" parameterType="com.example.web.User1">
+                update user1 set username=#{username},password=#{password} where userId=#{userId}
+        </update>
+        
+        <delete id="deleteUser" parameterType="com.example.web.User1">
+                delete from user1 where userId=#{userId}
+        </delete>
+ 
+        <select id="selectAll" resultType="com.example.web.User1">
+                select * from user1
+        </select>
+ 
+        <select id="selectUserById" resultType="com.example.web.User1">
+                select*from user1 where userId=#{userId}
+        </select>
+</mapper>
+ 
+