创建Maven并且与Mysql连接_mysql数据库如何创建并与maven项目链接

创建MySQL

1、打开HeidiSQL

2、输入密码 点击开打

3、新建一个名为restaurant的数据库  点击确定

4、 在restaurant数据库中创建名为user的数据表，并且添加数据  点击保存

5、数据表创建成功

使用JAVA查询MySQL

1、在Maven中的pom.xml中添加MySQL查询语句  点击刷新按钮

 <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</version>
        </dependency>
 
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.3</version>
        </dependency>

2、在com.school下创建一个mapper的包

3、在mapper包下新建一个接口UserMapper，添加以下代码

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
 
@Mapper
public interface UserMapper {
    @Select("SELECT `name` FROM user WHERE id = #{id}")
    public String selectManmeById(long id);
}

4、在rescourcs下新建一个file的yml文件  命名为application.yml

5、在.yml中添加以下代码

spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/restaurant?serverTimezone=Asia/Shanghai
    username: root
    password: 123456
    driver-class-name: com.mysql.cj.jdbc.Driver
mybatis:
  configuration:
    map-underscore-to-camel-case: true
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

6、在controller下新建一个UserController类  并添加如下代码

import com.school.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
@ResponseBody
public class UserController {
    @Autowired
    private UserMapper userMapper;
    
    @RequestMapping("getName")
    public String getName(Long id){
        return userMapper.selectManmeById(id);
    }
}

7、运行Main  在浏览器中输入“http://127.0.0.1:8080/getName?id=1”  并且运行