java连接数据库万能代码

import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;



public class connectURL {
protected static String dbClassName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
protected static String mydbUser = "sa";
protected static String mypassword = "123";

String connectionUrl = "jdbc:sqlserver://localhost:1433;" +
"databaseName=carpark;SelectMethod=Cursor";


private static Connection con = null;
Statement stmt = null;
ResultSet rs = null;

public connectURL(){

try {
if( con == null) {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
             con = DriverManager.getConnection(connectionUrl,mydbUser,mypassword);