springboot连接mysql简单例子

第一步：    打开 https://start.spring.io/

输入 mysql   client，web，jdbc，jpa

然后  idea   import 进入idea

连接mysql逻辑

package com.segmentfault.springbootlesson61;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import sun.font.StandardGlyphVector;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.HashMap;
import java.util.Map;

/**
 * Created with IntelliJ IDEA.
 * User: @别慌
 * Date: 2019-07-31
 * Time: 11:04
 * Description:
 */
@RestController   //返回json数据类型
@RequestMapping("/user")    //获取web页面的mapping地址
public class jdbcController {

    @Autowired              //自动装配，根据类型进行装配，map<Object,String>  装配的值就是  int，string

    private DataSource dataSource;

    @GetMapping("get")

    public Map<Object,String> getuser(@RequestParam(value = "idd",defaultValue = "1") String idd ){
        // RequestParam   请求的参数
        Map<Object,String> data=new HashMap<Object,String>();

            Connection connection=null;
        try {
            connection=dataSource.getConnection();
            Statement statement=connection.createStatement();
            ResultSet resultSet=statement.executeQuery("select idd,name from song where idd ="+idd);
            while (resultSet.next()){
                int idd_=resultSet.getInt("idd");
                String name=resultSet.getString("name");

                data.put(idd_,name);
                System.out.println(idd_+"="+name);

            }


        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        return data;

    }
}

spring.datasource.url=jdbc:mysql://localhost:3306/test    //连接的mysqlurl地址

spring.datasource.username=root                           //连接的mysql账号密码
spring.datasource.password=123456

spring.datasource.driverClassName=com.mysql.jdbc.Driver   //连接的mysql数据驱动