springboot+mybatis整合，实现增删改查
springboot+mybatis项目整合，实现增删改查
一、创建数据表
CREATE TABLE `user_info` (
`user_id` int(20) NOT NULL AUTO_INCREMENT,
`user_name` varchar(64) NOT NULL COMMENT '用户名称',
`login_name` varchar(64) NOT NULL COMMENT '登录名称',
`login_pass` varchar(32) NOT NULL COMMENT '登录密码',
`create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '创建时间',
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8;
二、springboot+mybatis 项目整合
1、创建项目file—new–maven project–next
2、选择以quickstart结尾的或者webapp结尾的，点击next
3、设置好group id 和项目名称。finish
4、在pom文件里面配置相关的依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0modelVersion>
<groupId>com.tc.usergroupId>
<artifactId>userartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>jarpackaging>
<name>username>
<description>Demo project for Spring Bootdescription>
<parent>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>2.1.3.RELEASEversion>
<relativePath />
parent>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<java.version>1.8java.version>
properties>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.mybatis.spring.bootgroupId>
<artifactId>mybatis-spring-boot-starterartifactId>
<version>1.3.1version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<scope>runtimescope>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-loggingartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-thymeleafartifactId>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
plugins>
build>
project>
5、引入相关依赖过后项目会报错
6、解决项目错误：右键项目–maven–update project勾选项目点击ok
7、创建相关文件及包
8、在application.properties里面配置数据库
spring.datasource.url = jdbc:mysql://192.168.3.21:3306/tc_db?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username = root
spring.datasource.password = 123456
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.max-active=20
spring.datasource.max-idle=8
spring.datasource.min-idle=8
spring.datasource.initial-size=10
mybatis.mapper-locations= classpath:mapper/*.xml
9、写实体类（User）并添加gettters和setters方法
package com.tc.demo.entity;
import java.util.Date;
public class User {
private Integer userId;
private String userName;
private String loginName;
private String loginPass;
private Date createTime;
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getLoginName() {
return loginName;
}
public void setLoginName(String loginName) {
this.loginName = loginName;
}
public String getLoginPass() {
return loginPass;
}
public void setLoginPass(String loginPass) {
this.loginPass = loginPass;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
@Override
public String toString() {
return "User [userId=" + userId + ", userName=" + userName + ", loginName=" + loginName + ", loginPass="
+ loginPass + ", createTime=" + createTime + "]";
}
}
10、写mapper接口，mapper接口用@Repository注解
package com.tc.demo.mapper;
import java.util.List;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;
import com.tc.demo.entity.User;
@Repository
public interface UserMapper {
/**
* 查询全部用户
* @return
*/
public List<User> listUser();
/**
* 新增用户信息
* @param user 用户信息
* @return 返回主键id
*/
public Integer insertUser(User user);
/**
* 根据主键userId查询对象
* @param userId 用户id
* @return 用户信息
*/
public User queryByUserId(@Param("userId")Integer userId);
/**
* 修改用户信息
* @param user
* @return
*/
public Integer updateUser(User user);
/**
* 根据用户id删除用户
* @param userId
* @return 返回 受影响的行
*/
public Integer delete(@Param("userId")Integer userId);
}
11、写mapper.xml文件(sql语句里面对应的id值是mapper类里面对应方法的方法名)
<mapper namespace="com.tc.demo.mapper.UserMapper">
<resultMap id="result" type="com.tc.demo.entity.User">
<result property="userId" column="user_id" />
<result property="userName" column="user_name" />
<result property="loginName" column="login_name"/>
<result property="loginPass" column="login_pass"/>
<result property="createTime" column="create_time"/>
resultMap>
<select id="listUser" resultMap="result" parameterType="com.tc.demo.entity.User">
SELECT
user_id
,user_name
,login_name
,login_pass
,create_time
FROM user_info
select>
<select id="queryByUserId" resultMap="result" parameterType="com.tc.demo.entity.User">
SELECT
user_id
,user_name
,login_name
,login_pass
FROM user_info where user_id=#{userId}
select>
<insert id="insertUser" parameterType="com.tc.demo.entity.User">
INSERT INTO user_info (
user_name
, login_name
, login_pass
, create_time
)VALUES(
#{userName}
,#{loginName}
,#{loginPass}
,#{createTime}
)
insert>
<update id="updateUser" parameterType="com.tc.demo.entity.User">
UPDATE user_info
SET
user_name = #{userName}
, login_name = #{loginName}
, login_pass = #{loginPass}
WHERE
user_id = #{userId}
update>
<delete id="delete" parameterType="java.lang.Integer">
DELETE FROM user_info WHERE user_id = #{userId}
delete>
mapper>
12、编写service接口，service层使用@Service注解
package com.tc.demo.service;
import java.util.List;
import org.springframework.stereotype.Service;
import com.tc.demo.entity.User;
@Service
public interface UserService {
/**
* 查询所有用户信息
* @return
*/
public List<User> listUser();
/**
* 根据用户id查询用户信息
* @param userId
* @return 返回User实体信息
*/
public User queryByUserId(Integer userId);
/**
* 新增用户信息
* @param user
* @return
*/
public Integer insertUser(User user);
/**
* 修改用户信息
* @param user
* @return
*/
public Integer updateUser(User user);
/**
* 根据用户id删除用户信息
* @param userId
* @return
*/
public Integer delete(Integer userId);
}
13、实现service接口（implements 需要实现接口的名）
package com.tc.demo.service.impl;
import java.util.Date;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.tc.demo.entity.User;
import com.tc.demo.mapper.UserMapper;
import com.tc.demo.service.UserService;
@Service
public class UserServiceImpl implements UserService{
//注入UserMapper
@Autowired
private UserMapper userMapper;
@Override
public List<User> listUser() {
//查询所有，调用usermapper中的查询方法listUser
return userMapper.listUser();
}
//新增用户信息
@Override
public Integer insertUser(User user) {
//给时间赋值
user.setCreateTime(new Date());
//调用usermapper中的新增方法insertUser
return userMapper.insertUser(user);
}
@Override
public User queryByUserId(Integer userId) {
//调用usermapper中的根据用户id查询用户信息的方法queryByUserId
return userMapper.queryByUserId(userId);
}
@Override
public Integer updateUser(User user) {
//调用usermapper中的修改方法updateUser
return userMapper.updateUser(user);
}
@Override
public Integer delete(Integer userId) {
//调用usermapper中的删除方法delete
return userMapper.delete(userId);
}
}
14、编写controller类，controller层使用@Controller注解
package com.tc.demo.controller;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import com.tc.demo.entity.User;
import com.tc.demo.service.UserService;
/**
*
* @ClassName: UserController
* @Description: 用户访问层
* @author 唐程
* @date 2020-04-02 10:22:42
*/
//@RestController 是 @Controller + @ResponseBody
@Controller
public class UserController {
//日志
private static final Logger logger = LoggerFactory.getLogger(UserController.class);
//@Autowired：实例化UserService类
@Autowired
private UserService userservice;
/**
* 新增用户信息
* @param user
* @return
*/
@RequestMapping("/addUser")
public String insert(User user,Model model){
//1. 获取表单数据 == user
//2. 调用业务方法
int rows = userservice.insertUser(user);
if(rows > 0){
//前端保存的返回值
model.addAttribute("msg", "新增成功");
}
return "success";
}
/**
* 根据用户id查询用户信息
* @param model
* @param userId
* @return
*/
@RequestMapping("/selectUserId")
public String queryByUserId(Model model,Integer userId){
User user=userservice.queryByUserId(userId);
//通过model把user查询到的值传到页面
model.addAttribute("u",user );
return "update";
}
/**
* 修改用户信息
* @param user
* @return
*/
@RequestMapping("/update")
public String update(User user,Model model){
//获取user对象
//调用修改方法
Integer rows= userservice.updateUser(user);
if( rows==null ){
//前端保存的返回值
model.addAttribute("msg", "修改成功");
}
return "redirect:/selectUserList";
}
/**
* 查询所有用户
* @param model 保存页面需要的参数
* @return 返回到的页面
*/
@RequestMapping("/selectUserList")
public String queryUserList(Model model){
//1.调用业务方法
List<User> list= userservice.listUser();
//2.把查询的用户集合信息
//通过model的addAttribute方法，把list集合值传给前端页面
//model.addAttribute("前端接收的变量名", "结果值");
model.addAttribute("userList", list);
//3.返回到页面
return "userlist";
}
/**
* 根据用户id删除用户信息
* @param userId
* @return
*/
@RequestMapping("/deleteUser")
public String deleteUser(Integer userId){
Integer rows = userservice.delete(userId);
logger.info("删除,影响行:"+rows);
return "redirect:/selectUserList";
}
}
15、画前端页面userlist.html
<html xmls:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Insert title heretitle>
head>
<body>
<table border="1" style="width: 100%">
<tr>
<td colspan="7">
<button type="button" onclick="addUser()">添加button>
td>
tr>
<tr>
<td>序列td>
<td>用户IDtd>
<td>用户名称td>
<td>登录名称td>
<td>登录密码td>
<td>创建时间td>
<td>操作td>
tr>
<tr th:each="obj,objStat:${userList}">
<td th:text="${objStat.index + 1}">td>
<td th:text="${obj.userId}">td>
<td th:text="${obj.userName}">Onionstd>
<td th:text="${obj.loginName}">td>
<td th:text="${obj.loginPass}">td>
<td th:text="${#dates.format(obj.createTime,'yyyy-MM-dd')}">td>
<td colspan="2">
<a th:href="@{/selectUserId(userId=${obj.userId})}">编辑a>
<a th:href="@{/deleteUser(userId=${obj.userId})}">删除a>
td>
tr>
table>
<script type="text/javascript">
function addUser(){
window.location.href="add.html";
}
script>
body>
html>
16、add.html页面
<html xmls:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Insert title heretitle>
head>
<body>
<form action="/addUser" method="post">
<table border="1">
<tr>
<input type="text" id="" name="userId" th:value="${u?.userId}"/>
<td>用户名称 : td>
<td><input type="text" id="" name="userName" th:value="${u?.userName}"/> td>
tr>
<tr>
<td>登录名称 : td>
<td><input type="text" id="" name="loginName" th:value="${u?.loginName}"/> td>
tr>
<tr>
<td>登录密码 : td>
<td><input type="text" id="" name="loginPass" th:value="${u?.loginPass}"/> td>
tr>
<tr>
<td colspan="2" style="text-align: center;">
<button type="submit">确定button>
td>
tr>
table>
form>
body>
html>
17、success.html页面
<html xmls:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Insert title heretitle>
head>
<body>
<span th:text=${msg}>span>
<a href="selectUserList">
进入列表页
a>
body>
html>
18、update.html页面
<html xmls:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Insert title heretitle>
head>
<body>
<span th:text=${msg}>span>
<a href="selectUserList">
进入列表页
a>
body>
html>
所有html页面中action的值都是对应的是对应方法的方法名
19、运行项目浏览器访问 localhost:8080/selectUserList ，点击按钮实现对应功能
