SpringBoot封装JDBC的实现步骤

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

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 DataSpringbootApplicationTests {

    @Autowired
    DataSource dataSource;
    @Test
    void contextLoads() throws SQLException {
        System.out.println("默认数据源");
        System.out.println(dataSource.getClass());
        System.out.println("获得数据库连接");
        Connection connection = dataSource.getConnection();
        System.out.println(connection);

        System.out.println("关闭数据源");
        connection.close();
    }
}

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 {
    @Autowired
    JdbcTemplate jdbcTemplate;
    //查询数据库所有信息
    @GetMapping("/userList")
    public List<Map<String,Object>> userList(){
        String sql = "select * from user";
        List<Map<String, Object>> mapList = jdbcTemplate.queryForList(sql);
        return  mapList;
    }
    @GetMapping("/addUser")
    public String addUser(){
        String sql = "insert into mybatis.user(id,name,pwd) values (4,'hhh','451651')";
        jdbcTemplate.update(sql);
        return "update-ok";
    }
    @GetMapping("/deleteUser/{id}")
    public String deleteUser(@PathVariable("id") int id){
        String sql = "delete from mybatis.user where id = ?";
        jdbcTemplate.update(sql,id);
        return "delete-ok";
    }
}