使用SQL中的SELECT语句可以查询出数据库的全部结果，在JDBC的操作中数据库的所有查询记录将使用ResultSet进行接收，并使用ResultSet显示内容。

从user表中查询数据

//=================================================

// File Name :MySQL_demo

//------------------------------------------------------------------------------

// Author :Common

import java.sql.*;

//主类

//Function : MySQL_demo

public class MySQL_demo {

//定义MySQL的数据库驱动程序

public static final String DBDRIVER = "org.gjt.mm.mysql.Driver";

//定义MySQL数据库的连接地址

public static final String DBURL = "jdbc:mysql://localhost:3306/mysql_demo";

//MySQL数据库的连接用户名

public static final String DBUSER = "root";

//MySQL数据库的连接密码

public static final String DBPASS = "123456";

public static void main(String[] args) throws Exception {

// TODO 自动生成的方法存根

Connection conn = null;//数据库连接

Statement stmt = null;//数据库操作

ResultSet rs = null;//保存查询结果

String sql = "SELECT id,name,password,age,sex,birthday FROM user";

Class.forName(DBDRIVER);//加载驱动程序

//连接MySQL数据库时，要写上连接的用户名和密码

conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS);

stmt = conn.createStatement();//实例化Statement对象

rs = stmt.executeQuery(sql);//实例化ResultSet对象

while(rs.next()){

//int id = rs.getInt("id");

//String name = rs.getString("name");

//String pass = rs.getString("password");

//int age = rs.getInt("age");

//String sex = rs.getString("sex");

//Date d = rs.getDate("birthday");

int id = rs.getInt(1);

String name = rs.getString(2);

String pass = rs.getString(3);

int age = rs.getInt(4);

String sex = rs.getString(5);

Date d = rs.getDate(6);

System.out.println("编号："+id);

System.out.println("名字："+name);

System.out.println("密码："+pass);

System.out.println("年龄："+age);

System.out.println("性别："+sex);

System.out.println("生日："+d);

}

rs.close(); //关闭结果集

stmt.close(); //操作关闭

conn.close(); //数据库关闭

}

}