JDBC入门连接MySQL查数据

在MySQL中建立user表，插入数据

create table user(
id int,
name varchar(10),
age int
)engine myisam charset utf8;

insert into user(id,name,age) values
(1,'zhang',18),
(2,'lisi',20),
(3,'laowang',30);

新建java工程，导入驱动jar包

java类

package com.itheima.domain;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class JDBCTest {
	public static void main(String[] args) throws Exception {
		//1,加载驱动程序
		Class.forName("com.mysql.jdbc.Driver");
		//2,链接数据库
		Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/qq","root","111111");
		//3,得到发送查询语句的对象
		Statement stmt=conn.createStatement();
		//4,发送语句
		String sql="select id,name,age from user";
		ResultSet rs=stmt.executeQuery(sql);
		//5,打印
		while(rs.next()){
			System.out.print("id号:"+rs.getInt("id"));
			System.out.print("姓名:"+rs.getString("name"));
			System.out.println("年龄:"+rs.getInt("age"));
		}
		//6释放资源
		rs.close();
	    stmt.close();
	    conn.close();

	}

}

运行结果：

id号:1姓名:zhang年龄:18
id号:2姓名:lisi年龄:20
id号:3姓名:laowang年龄:30