package util;

import java.sql.*;

public class DBHelper {

private static final String driver="com.microsoft.sqlserver.jdbc.SQLServerDriver";//數(shù)據(jù)庫驅(qū)動

? ? private static final String url="jdbc:sqlserver://localhost:1433; DatabaseName=shopping";//連接數(shù)據(jù)庫的URL地址

? ? private static final String username="sa";//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 = null ;

//靜態(tài)代碼塊負(fù)責(zé)加載驅(qū)動

static

{

try

{

Class.forName(driver);

}

catch(Exception ex)

{

ex.printStackTrace();

}

}

//單例模式返回數(shù)據(jù)庫連接對象

public static Connection getConnection() throws Exception

{

if(conn==null)

{

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

return conn;

}

return conn;

}

public static void main(String[] args){

try

{

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();

}

}

}