package util;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.Statement;

public class DBHelper{

private static ?final String driver ?= "com.mysql.jdbc.Driver";//數(shù)據(jù)庫驅(qū)動(dòng)

//連接數(shù)據(jù)庫的URL地址

private static final String url = "jdbc:mysql://localhost:3306/shopping?useUnicode=true"

+ "&characterEncoding=UTF-8";

private static final String username = "root";//數(shù)據(jù)庫的用戶名

private static final String password = "123456";//數(shù)據(jù)庫的密碼

private static ?Connection conn;

//靜態(tài)代碼塊負(fù)責(zé)加載驅(qū)動(dòng)

static?

{

try

{

Class.forName(driver);

}

catch(Exception ex)

{

ex.printStackTrace();

}

}

//單例模式返回?cái)?shù)據(jù)庫連接對(duì)象

public static Connection getConnection() throws Exception

{

if(conn==null)

{

conn = DriverManager.getConnection(url, username, password);

}

return conn;

}

public static void main(String[] args) {

try

{

Connection conn = DBHelper.getConnection();

if(conn!=null)

{

System.out.println("數(shù)據(jù)庫連接正常！");

}

else

{

System.out.println("數(shù)據(jù)庫連接異常！");

}

}

catch(Exception ex)

{

ex.printStackTrace();

}

}

}