JAVA连接MySQL数据库----(常用数据库连接二)


1.安装好Mysql后打开命令行(按win+r后输入cmd),然后输入mysql -uroot -padmin,进入mysql,其中root为用户名,admin为密码,是安装mysql时设置的。

安装教程:http://blog.csdn.net/whzhaochao/article/details/12858711

2.创建数据库 

输入create database zhaochao;如图如所:


3.选择数据库,并创建表

输入:use zhaochao;选择数据库

输入: create table USER ( ID int ,UserName varchar(30),UserPasswd varchar(30));创建表


4.向表中插入数据

 insert into USER values (1,'zhaochao','zhaochao');

 insert into USER values (2,'admin','admin');

 select * from user;

5.eclipse中建立接口文件iConn.java

package com.zhaochao.dba;

import java.sql.Connection;
public interface iConn {
	Connection getConn();
}
6.建立MySQLConn.java实现iConn

package com.zhaochao.dba;

import java.sql.Connection;
import java.sql.DriverManager;

public class MySQLConn implements iConn {
	private static final String DBDRIVER = "org.gjt.mm.mysql.Driver" ;
	private static final String DBURL = "jdbc:mysql://localhost:3306/zhaochao" ;
	private static final String DBUSER = "root" ;
	private static final String DBPASS = "admin";
	private Connection conn=null;
	@Override
	public Connection getConn() {
		// TODO Auto-generated method stub
		try {
			Class.forName(DBDRIVER);
			this.conn=DriverManager.getConnection(DBURL, DBUSER, DBPASS);
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return this.conn;
	}

}
7.测试连接
package com.zhaochao.dba;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		TestMySQL();
	//	TestOracle();	
	//	TestDB2();
	//	TestSQLServer();
   //	TestAccess();
		
	}

	
	
	private static void TestMySQL() {
		Connection conn=null;
		PreparedStatement ps=null;
		ResultSet rs=null;
		iConn iconn=new MySQLConn();
		conn=iconn.getConn();
		String sql="select * from user";
		
		try {
			ps=conn.prepareStatement(sql);
			rs=ps.executeQuery();
			while(rs!=null && rs.next()){
				System.out.println(rs.getString(1)+"|"+rs.getString(2)+"|"+rs.getString(3));
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(conn!=null){
				try {
					conn.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(ps!=null){
				try {
					ps.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			if(rs!=null){
				try {
					rs.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}

}
	


8.运行结果

1|zhaochao|zhaochao
2|admin|admin

注意事项:

第一次运行会出错java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver,这是因为没有导入连接mysql的mysql-connector-java-5.1.6-bin.jar包,下载地址:http://download.csdn.net/detail/whzhaochao/6414157

下载好后,在工程中建立文件夹,将mysql-connector-java-5.1.6-bin.jar拷入文件夹中,右击mysql-connector-java-5.1.6-bin.jar-->build Path-->Add t Build Path,完成jar包的导入,然后再运行测试应该不会有问题。


posted @ 2013-10-17 16:07  赵侠客  阅读(164)  评论(0编辑  收藏  举报