Spring Boot使用JDBC方式连接MySQL

首先去spring官网下载一个名为test的Spring Boot项目模板：https://start.spring.io/

然后在mysql中的testdb数据库中新建一张名为test_user的表：

drop table if exists `test_user`;
create table `test_user` (
    `id` integer not null auto_increment primary key,
    `name` varchar(20),
    `password` varchar(20)
);
insert into test_user (`name`, `password`) values ('zifeiy', '123456'), ('apple', '654321');

项目中，首先在pom.xml中引入依赖：

		<dependency>
		    <groupId>mysql</groupId>
		    <artifactId>mysql-connector-java</artifactId>
		</dependency>
		<dependency>
		    <groupId>org.springframework.boot</groupId>
		    <artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>

在application.properties中填写MySQL连接相关的信息：

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/testdb
spring.datasource.username=root
spring.datasource.password=password
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

然后新建一个Java Bean：TestUser.java：

package com.zifeiy.test.po;

public class TestUser {
	private Integer id;
	private String name;
	private String password;
	
	// getters & setters
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
}

然后在测试类中编辑如下代码进行测试：

package com.zifeiy.test;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import javax.annotation.Resource;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.test.context.junit4.SpringRunner;

import com.zifeiy.test.po.TestUser;

@RunWith(SpringRunner.class)
@SpringBootTest
public class TestApplicationTests {
	
	@Resource
	private JdbcTemplate jdbcTemplate;

	@Test
	public void contextLoads() {
		String sql = "select * from test_user";
		List<TestUser> userList = (List<TestUser>) jdbcTemplate.query(sql, new RowMapper<TestUser>() {

			@Override
			public TestUser mapRow(ResultSet rs, int rowNum) throws SQLException {
				TestUser user = new TestUser();
				user.setId(rs.getInt("id"));
				user.setName(rs.getString("name"));
				user.setPassword(rs.getString("password"));
				return user;
			}
			
		});
		System.out.println("查询成功");
		for (TestUser user : userList) {
			System.out.println("id = " + user.getId() + " , name = " + user.getName() + " , password = " + user.getPassword());
		}
	}

}

在命令行中得到测试结果如下：

查询成功
id = 1 , name = zifeiy , password = 123456
id = 2 , name = apple , password = 654321