數據庫的連接sqlserver

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Connect_sqlserver
{
 String url="jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=testDatabase";
 String username="sa";
 String password="13974224803";
 
 Connection con;
 Statement sql;
 ResultSet rs;
 
 public Connect_sqlserver()
 {
  try {
   Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
   con = DriverManager.getConnection(url, username, password);
   sql = con.createStatement();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 public ResultSet executeQuery(String sqlString)
 {
  rs=null;
  try {
   rs = sql.executeQuery(sqlString);
  } catch (SQLException e) {
   e.printStackTrace();
  }  
  return rs;
 }
 
 public void close()
 {
  try {
   sql.close();
   con.close();
  } catch (Exception e) {
   e.printStackTrace();
  }  
 }
 
 public static void main(String[] args)
 {
  Connect_sqlserver cs=new Connect_sqlserver();
  ResultSet rs;
  rs=cs.executeQuery("select * from userTable");
  try {
   while (rs.next())
   {
    System.out.print(rs.getString("user_name") + "/t");
    System.out.print(rs.getString("user_password") + "/t");
    System.out.println(rs.getString("user_age"));
   }
  } catch (Exception e) {
   e.printStackTrace();
  } 
  cs.close();
 }
}