Spring boot 整合JDBC 【springboot整合持久层技术系列】

第一步：首先导入Maven依赖：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.23</version>
</dependency>
<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
            <version>8.0.21</version>
 </dependency>

在application.properites文件中配置数据源

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.username=root
spring.datasource.password=123
spring.datasource.url=jdbc:mysql://localhost:3306/ssmbuild

创建一个User实体：

package com.example.demo.bean;

public class User {
    private Integer id;
    private String username;
    private String address;

    public Integer getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

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

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

//    public User(Integer id, String username, String address) {
//        this.id = id;
//        this.username = username;
//        this.address = address;
//    }

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

创建一个业务层 

package com.example.demo.service;

import com.example.demo.bean.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserService {

    @Autowired
    JdbcTemplate jdbcTemplate;
    public Integer addUser(User user){
        return jdbcTemplate.update("insert into user(username,address) values(?,?)",user.getUsername(),user.getAddress());
    }

    public Integer updateUsernameByid(User user){
        return jdbcTemplate.update("update user set username=? where id=?",user.getUsername(),user.getId());
    }

    public Integer deleteUserById(Integer id){
        System.out.println("hah");
        return jdbcTemplate.update("delete from user where id=?",id);
    }

    public List<User> getAllUser(){
        System.out.println("haha");
        System.out.println("jajaj");
        return jdbcTemplate.query("select * from user", new BeanPropertyRowMapper<>(User.class)
        );
    }
}

最后在单元测试类中进行测试： 

package com.example.demo;

import com.example.demo.bean.User;
import com.example.demo.service.UserService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest
public class DemoApplicationTests {

    @Autowired
    UserService userservice;

    @Test
    void contextLoads() {
        User user=new User();
        user.setAddress("张家口市");
        user.setUsername("家煦");
        userservice.addUser(user);


    }

    @Test
    public void Test1(){
        User user =new User();
        user.setAddress("保定");
        user.setUsername("李四");
        user.setId(1);
        userservice.updateUsernameByid(user);
    }

    @Test
    public void Test2(){
        User user=new User();
        user.setId(1);
        userservice.deleteUserById(1);
//        System.out.println(Test3());
    }

    @Test
    public void Test3(){
//        System.out.println(userservice.getAllUser());
        List<User> userlist=userservice.getAllUser();
        System.out.println(userlist);
        return userlist;
        System.out.println("123");


    }

}

以上就是JDBC和spring boot的整合