php实现的单例模式的例子 -PHP-Tutorial-php.cn

php实现的单例模式的例子

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Freigeben： 2016-07-25 09:02:49

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/****------------------*******
* ghf@localhost.localdomain *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* @link http://bbs.it-home.org
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
****------------------*******/
define("DB_HOST","localhost");
define("DB_USER","root");
define("DB_PASS","");
define("DB_NAME","test"):
class DBConnect()
{
private static $DB;
private function & getCon()
{
if(self::DB == nuyll)
{
self::DB = &mysql_connect(DB_HOST,DB_USER,DB_PASS) or die("连接数据库失败！");
mysql_select_db(self::DB,DB_NAME);
}
return self::DB;
}
/*************
* insert or update data to database;
*
*/
public upDate($sql)
{
return mysql_query($sql,this.getCon());
}
/***************
* query data from database and return data that type is array
*/
public query($sql)
{
$rs = mysql_query($sql,this.getCon());
$rows = array();
$i = 0;
while($row = mysql_fetch_array($rs))
{
rows[$i] = $row;
$i++;
}
mysql_free_result($rs);
return $rows;
}
/************
* query database and return data rows;
*/
public query_num_rows($sql)
{
$rs = mysql_query($sql,this.getCon());
return mysql_num_row($rs);
}
/**********
* close dbconnection;
*/
public colse()
{
mysql_colse(this.getCon());
self::DB = null;
}
}
?>

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