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我有下面的类:PDO连接 - 最大连接
<?php
class Database {
protected static $_instance;
protected $_connection;
protected $_dbhost=DB_HOST;
protected $_dbname=DB_DBNAME;
protected $_username = DB_USER;
protected $_password = DB_PASS;
protected $_dbType = "mysql";
/**
* Singleton pattern implementation makes "new" unavailable
*/
protected function __construct()
{
$this->_connection =
new PDO($this->_dbType . ":host=" . $this->_dbhost . ";dbname=" . $this->_dbname, $this->_username, $this->_password, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8", PDO::ATTR_PERSISTENT => true));
}
public function getConnection()
{
return $this->_connection;
}
public static function getInstance()
{
if (null === self::$_instance) {
self::$_instance = new self();
}
return self::$_instance;
}
/**
* Singleton pattern implementation makes "clone" unavailable
*/
protected function __clone()
{}
}
?>
来源:https://stackoverflow.com/a/3010486
现在我有一个第二类,它具有所有访问数据库的功能。
我的问题:
我曾与我的脚本最大连接数的问题,所以我使用新的数据库类。在我的辅助类我不喜欢这样写道:
<?php
class helper {
function getAllInvitesFromPlayer($uid) {
$sql = "SELECT request_id FROM ".DBPREFIX."invites WHERE inviter_id = :uid AND joined = 1";
try {
$db = Database::getInstance()->getConnection();
$stmt = $db->prepare($sql);
$stmt->bindParam("uid", $uid);
$stmt->execute();
$content = $stmt->fetch(PDO::FETCH_LAZY);
$db = null;
return $content;
} catch(PDOException $e) {
echo $e->getMessage();
}
}
}
后的“尝试”是正确使用$db = Database::getInstance()->getConnection();
或应我在每一个功能“外包”到一个类变量和访问它像$this->_db;
,并尝试?
有什么更好的方法来避免与我的db连接太多?
它肯定更好的只是在文件中初始化助手类,对吧?并不总是调用$helper = new helper()
,因为这将始终创建一个新的数据库连接,对吧?
谢谢你的帮助!