关闭MySQL连接(PHP) [英] Close MySQL connection (PHP)
问题描述
我写了一个类来创建与MySQL的自动连接并创建查询.看起来是这样的:
I wrote a class to create an automated connection with MySQL and create queries. Here's how it looks like:
include("constants.php");
class MySQLDB {
var $connection;
function __construct() {
$this->connection = mysql_connect(DB_HOST, DB_USER, DB_PASS) or die(mysql_error());
mysql_select_db(DB_NAME, $this->connection);
mysql_set_charset('utf8', $this->connection);
}
// SELECT ALL FROM
function sf($unit, $table) {
return mysql_query("SELECT ".$unit." FROM ".$table, $this->connection);
}
// and so on...
}
$mysql = new MySQLDB;
现在,我认为在其他php页面中运行某些功能后关闭连接会更好.那么我该如何在课堂上做到这一点(最有效的方法)?
Now, I thought it would be better if I close the connection after I run some of this functions in other php pages. So how do I do that (the most effective way) in this class?
我尝试在课程末尾(在右括号之前)添加mysql_close($this->connection);
,但这给我一个错误.
I tried adding mysql_close($this->connection);
at the end of the class (before the close bracket) but it gives me an error.
推荐答案
您需要将该代码放置在名为__destruct()
的函数中,其方式与__construct()
相同.参见 http://php.net/manual/zh/language.oop5.decon .php 了解更多信息.
You'd need to place that code in a function named __destruct()
, much in the same way as __construct()
. See http://php.net/manual/en/language.oop5.decon.php for more information.
代码如下:
include("constants.php");
class MySQLDB {
var $connection;
var $sf;
function __construct() {
$this->connection = mysql_connect(DB_HOST, DB_USER, DB_PASS) or die(mysql_error());
mysql_select_db(DB_NAME, $this->connection);
mysql_set_charset('utf8', $this->connection);
}
// SELECT ALL FROM
function sf($unit, $table) {
return mysql_query("SELECT ".$unit." FROM ".$table, $this->connection);
$this->sf();
}
// and so on...
function __destruct() {
mysql_close($this->connection);
}
}
请注意,运行此方法时您并不完全知道 :这取决于对象何时被垃圾回收.但是正如Ken在下面指出的那样,执行mysql_close()
有利于对称,但不必释放资源.
Please note that you don't know exactly when this method is run: that depends on when the object is garbage collected. But as Ken noted below, executing mysql_close()
is good for symmetry, but not necessary to free resources.
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