宁波实习培训记录（四)——基于SSM实现数据库的增删改查

在昨天的基础上继续实现增删改查功能。完整项目代码见​​完整代码​​

数据库结构如图

我的端口是3305总的文件结构图如下

一、删除功能

1. 在IUserInfoDao中声明方法public void delete(int id);
2. 在IUserInfoService中声明方法public void delete(int id);
3. 在UserInfoServiceImpl中实现方法

@Override
public void delete(int id) {
    userInfoDao.delete(id);

}

4.在UserInfoMapper.xml里面实现方法

<delete id="delete" parameterType="int">
    delete from userinfo where id=#{id}
</delete>

5.在UserInfoController中控制跳转实现

@RequestMapping("delete.do")
public ModelAndView delete(int id){
    userInfoService.delete(id);
    return findAll();
}

二、修改、添加功能

1、修改大致步骤与删除相似，需要注意的点是，修改我们写了新的页面，涉及到带参（也就是需要修改的id）进行跳转，多了toUpdate方法，还有就是findUserById方法用于查找到需要修改的对象，此方法实现流程和其他方法一样。然后就是用于更新数据的update方法，实现的步骤和delete一样
2、添加功能主要是实现insert方法，特别的地方在于，由于添加是跳转到新的页面，因此多了toInsert方法，这个方法由于不涉及数据库操作，直接在controller层实现即可

三、代码展示

1.dao层的IUserInfoDao

package com.zhongruan.dao;

import com.zhongruan.bean.UserInfo;

import javax.xml.registry.infomodel.User;
import java.util.List;

public interface IUserInfoDao {
    public List<UserInfo> findAll();
    public void toUpdate(int id);
    public void insert(UserInfo userInfo);
    public void delete(int id);
    public UserInfo findUserById(int id);
    public void update(UserInfo userInfo);

}

2、mapper中UserInfoMapper.xml用于实现dao中方法的相关配置

<?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.zhongruan.dao.IUserInfoDao" >
    <select id="findAll" resultType="com.zhongruan.bean.UserInfo">
        select * from userinfo
    </select>
    <insert id="insert" parameterType="com.zhongruan.bean.UserInfo" >
        insert into userinfo(name,password) values(#{name},#{password})
    </insert>
    <update id="update" parameterType="com.zhongruan.bean.UserInfo">
        update userinfo set name=#{name},password=#{password} where id=#{id}
    </update>
    <delete id="delete" parameterType="int">
        delete from userinfo where id=#{id}
    </delete>
    <select id="findUserById" resultType="com.zhongruan.bean.UserInfo" parameterType="int">
        select * from userinfo where id=#{id}
    </select>


</mapper>

3、IUserInfoService相关代码

package com.zhongruan.service;

import com.zhongruan.bean.UserInfo;

import java.util.List;

public interface IUserInfoService {
    public List<UserInfo> findAll();
    public void toUpdate(int id);
    public void insert(UserInfo userInfo);
    public void delete(int id);
    public UserInfo findUserById(int id);
    public void update(UserInfo userInfo);
}

4、UserInfoServiceImpl实现接口

package com.zhongruan.service.impl;

import com.zhongruan.bean.UserInfo;
import com.zhongruan.dao.IUserInfoDao;
import com.zhongruan.service.IUserInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service("userInfoServiceImpl")
public class UserInfoServiceImpl implements IUserInfoService {

    @Autowired
    IUserInfoDao userInfoDao;
    @Override
    public List<UserInfo> findAll() {
        return userInfoDao.findAll();
    }

    @Override
    public void toUpdate(int id) {
        userInfoDao.toUpdate(id);
    }

    @Override
    public void insert(UserInfo userInfo) {
        userInfoDao.insert(userInfo);
    }


    @Override
    public void delete(int id) {
        userInfoDao.delete(id);

    }

    @Override
    public UserInfo findUserById(int id) {
        return userInfoDao.findUserById(id);
    }

    @Override
    public void update(UserInfo userInfo) {
        userInfoDao.update(userInfo);
    }


}

5、UserInfoController控制跳转

package com.zhongruan.controller;

import com.sun.org.apache.xpath.internal.operations.Mod;
import com.zhongruan.bean.UserInfo;
import com.zhongruan.service.IUserInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import java.util.List;

@Controller
@RequestMapping("user")

public class UserInfoController {

    @Autowired
    IUserInfoService userInfoService;

    @RequestMapping("findAll.do")
    public ModelAndView findAll(){
        List<UserInfo> users = userInfoService.findAll();
        ModelAndView mv =new ModelAndView();
        mv.addObject("users",users);
        mv.setViewName("allUser");
        return mv;
    }

    @RequestMapping("delete.do")
    public ModelAndView delete(int id){
        userInfoService.delete(id);
        return findAll();
    }

    @RequestMapping("toUpdate.do")
    public ModelAndView toUpdate(int id){
        UserInfo userInfo=userInfoService.findUserById(id);
        ModelAndView mv =new ModelAndView();
        mv.addObject("userInfo",userInfo);
        mv.setViewName("updateUser");
        return mv;

    }

    @RequestMapping("update.do")
    public ModelAndView update(UserInfo userInfo){
        userInfoService.update(userInfo);
        return findAll();
    }

    @RequestMapping("insert")
    public ModelAndView insert(UserInfo userInfo){
        userInfoService.insert(userInfo);
        return findAll();
    }

    @RequestMapping("toInsert")
    public ModelAndView toInsert(){
        ModelAndView mv =new ModelAndView();
        mv.setViewName("addUser");
        return mv;
    }



}

6、addUser.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" isELIgnored="false"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>
<head>
    <title>新增用户</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    基于SSM框架的管理系统：简单实现增、删、改、查。
                </h1>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>新增用户</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/user/insert.do"
              method="post">
        用  户  id：<input type="text" name="id"><br><br><br>
        用户姓名：<input type="text" name="name"><br><br><br>
        用户密码：<input type="text" name="password"><br><br><br>
        <input type="submit" value="添加" >
    </form>

</div>

7、updateUser.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" isELIgnored="false"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>修改论文</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    基于SSM框架的管理系统：简单实现增、删、改、查。
                </h1>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>修改用户</small>
                </h1>
            </div>
        </div>
    </div>

    <form action="${pageContext.request.contextPath}/user/update.do"
          method="post">
        <input type="hidden" name="id" value="${userInfo.id}"/>
        用户姓名：<input type="text" name="name" value="${userInfo.name}"/>
        用户密码：<input type="text" name="password" value="${userInfo.password}"/>
        <input type="submit" value="提交" />
    </form>
</div>

四、结果展示

添加后

修改

修改后

删除