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Editorial Team
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Asked: 2026-05-15T01:42:02+00:00

I would like to know whether this MySql statement will be executed correctly, SELECT

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I would like to know whether this MySql statement will be executed correctly, 

"SELECT sum(price) FROM products WHERE productid IN (SELECT productid FROM shoppingcart WHERE sessionid=".$this->$sessionid.")"

And if not please give me pointers as to where I am wrong.

Thanks

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1 Answer

  1. Editorial Team

    I’m sure you meant

    $this->sessionid

    not 

    $this->$sessionid

    (the second one returns value of property, which name is stored in sessionid, thus, when $sessionid is ‘abcdef’, it tries to return value of $this->abcdef property).

    Also, enclose in ‘ AND escape all parameters. 

    "SELECT sum(price) FROM products WHERE productid IN (SELECT productid FROM shoppingcart WHERE sessionid='".mysql_escape_string($this->sessionid)."')";
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