SpringBoot系列：使用原生JDBC实现对数据库的增删改查

application.yml

spring:datasource:username: rootpassword: 123456url: jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8driver-class-name: com.mysql.cj.jdbc.Driver

ApplicationTests

package com.xiao;import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;@SpringBootTest
class Springboot04DataApplicationTests {@AutowiredDataSource dataSource;@Testvoid contextLoads() {System.out.println(dataSource.getClass());//获得数据库链接try {Connection connection= dataSource.getConnection();System.out.println(connection);connection.close();} catch (SQLException throwables) {throwables.printStackTrace();}}}

JDBCController

package com.xiao.controller;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;import java.util.List;
import java.util.Map;@RestController
public class JDBCController {@AutowiredJdbcTemplate jdbcTemplate;@GetMapping("/userList")public List<Map<String,Object>> userList(){String sql="select * from user";List<Map<String,Object>> list_maps=jdbcTemplate.queryForList(sql);return list_maps;}@GetMapping("/addUser")public String addUser(){String sql="insert into mybatis.user(id,name,pwd) values(4,'小如','123456')";jdbcTemplate.update(sql);return "ok";}@GetMapping("/updateUser/{id}")public String updateUser(@PathVariable("id") int id){String sql="update mybatis.user set name=?,pwd=? where id="+id;Object[] objects=new Object[2];objects[0]="小品";objects[1]="3745678";jdbcTemplate.update(sql,objects);return "ok";}@GetMapping("/deleteUser/{id}")public String deleteUser(@PathVariable("id") int id){String sql="delete from mybatis.user where id=?";jdbcTemplate.update(sql,id);return "ok";}
}

使用springboot后，你会发现，即便是原生JDBC来进行CRUD，依然十分的简便，因为springboot帮我们做了很多事，一个DataSource，一个JdbcTemplate就省去了很多很多我们原先需要做的事了。