spring-210728-02---JdbcTemplate操作数据库-添加&修改&删除功能

spring-210728-02—JdbcTemplate操作数据库-添加&修改&删除功能

• 演示
• UserDao.java（dao层接口）
• UserDaoImpl.java（这里实现DML操作）
• UserService.java（这里调用dao）
• TestUser01.java（测试）
• bean01.xml（Spring配置文件）
• User.java（实体类）

---

创建实体类
编写service和dao
	在dao进行数据库添加、修改、删除操作

---

演示

UserDao.java（dao层接口）

package com.bgy.spring.dao;
import com.bgy.spring.entity.User;

public interface UserDao {
    void add(User user);

    void updateUser(User user);

    void delete(String id);
}

---

UserDaoImpl.java（这里实现DML操作）

package com.bgy.spring.dao;

import com.bgy.spring.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

@Repository
public class UserDaoImpl implements UserDao{

    // 注入JdbcTemplate
    @Autowired
    private JdbcTemplate jdbcTemplate;

    // 添加的方法
    @Override
    public void add(User user) {

        // 创建sql语句
        String sql = "insert into t_user values(?,?,?)";

        // 调用方法实现
        /*
            jdbcTemplate.update(String sql , Object... args)
                第一个参数：sql语句
                第二个参数：可变参数，设置sql语句值
         */
        int update = jdbcTemplate.update(sql,user.getUserId(),user.getUsername(),user.getUstatus());
        System.out.println(update);
    }

    // 修改方法
    @Override
    public void updateUser(User user) {
       String sql = "update t_user set username=?,ustatus=? where user_id=?";

       Object[] args = {user.getUsername(),user.getUstatus(),user.getUserId()};
       int update = jdbcTemplate.update(sql, args);
       System.out.println(update);
    }

    // 删除方法
    @Override
    public void delete(String id) {
        String sql = "delete from t_user where user_id=?";
        int update = jdbcTemplate.update(sql, id);
        System.out.println(update);
    }
}

---

UserService.java（这里调用dao）

package com.bgy.spring.service;

import com.bgy.spring.dao.UserDao;
import com.bgy.spring.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {

    // 注入dao
    @Autowired
    private UserDao userDao;

    // 添加方法
    public void addUser(User user){
        userDao.add(user);
    }

    // 修改方法
    public void updateUser(User user){
        userDao.updateUser(user);
    }

    // 删除方法
    public void deleteUser(String id){
        userDao.delete(id);
    }
}

---

TestUser01.java（测试）

import com.bgy.spring.entity.User;
import com.bgy.spring.service.UserService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestUser01 {

    /**
     * 测试添加功能
     */
    @Test
    public void test01(){
        ApplicationContext context = new ClassPathXmlApplicationContext("bean01.xml");

        UserService userService = context.getBean("userService", UserService.class);

        User user = new User();
        user.setUserId("1004");
        user.setUsername("lisi");
        user.setUstatus("在B站学习Spring");
        userService.addUser(user);
    }

    /**
     * 测试修改功能
     */
    @Test
    public void test02(){
        ApplicationContext context = new ClassPathXmlApplicationContext("bean01.xml");

        UserService userService = context.getBean("userService", UserService.class);

        User user = new User();
        user.setUserId("1003");
        user.setUsername("wangwu");
        user.setUstatus("在划水......");
        userService.updateUser(user);
    }

    /**
     * 测试删除功能
     */
    @Test
    public void test03(){
        ApplicationContext context = new ClassPathXmlApplicationContext("bean01.xml");

        UserService userService = context.getBean("userService", UserService.class);

        userService.deleteUser("1004");
    }
}

---

bean01.xml（Spring配置文件）

<?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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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
                           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">


    <!-- 开启组件扫描 -->
    <context:component-scan base-package="com.bgy.spring"></context:component-scan>

    <!-- 数据库连接池 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
          destroy-method="close">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/spring_test_210728_01?serverTimezone=UTC&amp;useSSL=false" />
        <property name="username" value="root" />
        <property name="password" value="admin" />
    </bean>

    <!-- 创建JdbcTemplate对象 -->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">

        <!-- 注入DataSource -->
        <property name="dataSource" ref="dataSource"></property>

    </bean>
</beans>

---

User.java（实体类）

package com.bgy.spring.entity;

public class User {
    private String userId;
    private String username;
    private String ustatus;

    public String getUserId() {
        return userId;
    }
    public void setUserId(String userId) {
        this.userId = userId;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getUstatus() {
        return ustatus;
    }
    public void setUstatus(String ustatus) {
        this.ustatus = ustatus;
    }
}