PHP类 - 为每个实例存储MySQL连接

Question

I'm facing a problem which I don't know how to solve. Let's start explaining:

I've got the following class:

class MyClass{

    function MyClass($mysql_dbcon){
        $this->mysql_dbcon = $mysql_dbcon;
    }

    function execute(){
        include("myscript.php");
    }

}

myscript.php is an HTML template which uses Ajax to comunicate with other PHP scripts. Since these other PHP scripts aren't included directly in the class I'm not able to get the variable mysql_dbcon and use a different connection for each instance. Let's guess I've got the following instances:

$i1 = new Myclass($dbcon1);
$i1->execute();

$i2 = new Myclass($dbcon2);
$i2->execute();

Both instances will execute an Ajax function which call other processing scripts but these scripts can't access the instance's mysql_dbcon variable due to they're independent script executions.

How can I solve this? Is it correct to store the MySQL connection in $_SESSION so all the scripts can access it? Maybe this:

$_SESSION['instance_identifier'] = $this->mysql_dbcon;

What I want to achieve

I want to create a class in which the developer can set a MySQL connection and each instance can access to different databases so each instance will show data from different databases. The problem is the dynamic loading of that data.

Thanks in advance

Answer 1

You cannot solve it.

but this script can't access the instance's mysql_dbcon variable due to it's an independent script execution

Exactly. Period. You're starting an entirely different PHP script which shares absolutely nothing with the previous script. In fact, by the time the AJAX request is initiated by the browser, the "existing" MySQL connection will already be torn down and closed since the entire PHP script has already stopped.

"myscript.php" will simply have to open a new connection. You cannot serialise a connection into a session; it's not data which can be represented in a serialised form. This is exactly the same mechanism as any other two independent PHP files, the fact that include and AJAX are involved changes nothing.

Also see https://stackoverflow.com/a/13840431/476