Spring对MySql数据库的增删改查操作

1. 新建一个文件，选择为JAVA EE web选项
   
2. 建好项目后，在web文件下建立lib包，并导入所需要的包（注意每个人的mysql版本不同，所需的jdbc包版本也不同，以自己的为主）
   
3. 在src下建立所需的文件夹
4. 将spring.xml文件拷贝到src下
   
5. 编辑spring.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--   扫描注解“@Service”-->
    <context:component-scan base-package="com.zhongruan"></context:component-scan>
    <!--   <bean id="userService" class="com.zhongruan.service.impl.UserServiceImpl"></bean>-->


<!--    <bean id="user" class="com.zhongruan.bean.User">-->
<!--        <property name="id" value="1"></property>-->
<!--        <property name="username" value="zfx"></property>-->
<!--        <property name="password" value="123"></property>-->
<!--    </bean>-->

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"></property>

        <property name="url" value="jdbc:mysql://localhost/zjgm?serverTimezone=CTT"></property>
        <property name="username" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>
</beans>

6.User.java

package com.zhongruan.bean;

public class User {
    private int id;
    private String username;
    private String password;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

7. IUserDao.java`

package com.zhongruan.dao;

import com.zhongruan.bean.User;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

public interface IUserDao {

    List<User> findall();

    void delete(int id);

    void add(String username,String password);

    void update(int id,String username,String password);
}

8. IUserDaoImpl.java

package com.zhongruan.dao.impl;

import com.zhongruan.bean.User;
import com.zhongruan.dao.IUserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;

import java.util.List;

@Component
public class UserDaoImpl implements IUserDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    public List<User> findall() {

        //创建容器存储
        BeanPropertyRowMapper<User> rowMapper = new BeanPropertyRowMapper<>(User.class);

        //写sql语句
        String sql = "select * from tb_user";

        //执行查询
        List<User> users = jdbcTemplate.query(sql, rowMapper);

        return users;
    }

    @Override
    public void delete(int id) {
        String sql = "delete from tb_user where id=?";
        jdbcTemplate.update(sql, id);
    }

    @Override
    public void add(String username, String password) {
        String sql = "insert into tb_user (username,password) values (?,?)";
        jdbcTemplate.update(sql, username, password);
    }

    @Override
    public void update(int id, String username, String password) {
        String sql = "update tb_user set username=?,password=? where id=?";
        jdbcTemplate.update(sql, username, password, id);
    }
}

9. IUSerService.java

package com.zhongruan.service;

import com.zhongruan.bean.User;

import java.util.List;

public interface IUserService {
    List<User> findall();

    void delete(int id);

    void add(String username,String password);

    void update(int id,String username,String password);
}

10.UserServiceImpl.java

package com.zhongruan.service.impl;

import com.zhongruan.bean.User;
import com.zhongruan.dao.IUserDao;
import com.zhongruan.dao.impl.UserDaoImpl;
import com.zhongruan.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements IUserService {

    @Autowired
    private IUserDao userDao;


    @Override
    public List<User> findall() {
        List<User> users = userDao.findall();
        return users;
    }

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

    @Override
    public void add(String username, String password) {
        userDao.add(username, password);
    }

    @Override
    public void update(int id, String username, String password) {
        userDao.update(id, username, password);
    }
}

11. Test.java

package com.zhongruan.test;

import com.zhongruan.bean.User;
import com.zhongruan.dao.IUserDao;
import com.zhongruan.service.IUserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.applet.AppletContext;
import java.util.List;

public class Test {
    public static void main(String[] args) {

        ApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");
//        IUserService userService= (IUserService) context.getBean("userServiceImpl");
//        userService.findAll();
//        User user= (User) context.getBean("user");
//        System.out.println(user);

//        IUserDao userDao= (IUserDao) context.getBean("userImpl");
//        List<User> users=userDao.findall();
//        System.out.println(users);
//
//        userDao.delete(4);
//        List<User> users1=userDao.findall();
//        System.out.println(users1);

        IUserService userService= (IUserService) context.getBean("userServiceImpl");
        List<User> users=userService.findall();
        System.out.println(users);
    }
}

12. 完整格式