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I have been working a long time in buy.php and everything works but if I buy the same stock (AAPL) twice it insert a new row into table despite they have de same id, and symbol.

                //Pass it to capital leters
                $simbolo=strtoupper($_POST["symbol"]);

                query("INSERT INTO `Tabla para quotes` (id, symbol, shares) VALUES(?, ?, ?) ON DUPLICATE KEY UPDATE shares = shares + VALUES(shares)", $_SESSION["id"],$simbolo, $_POST["shares"]);
                //New chash
                query("UPDATE users SET cash = cash - ?  WHERE `id`=?",$costo,$_SESSION["id"]);
                //redirect to index
                redirect("index.php");

            }

Please help!

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1 Answer 1

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Check your table structure with phpmyadmin: there should be an index id_symbol of type BTREE unique not null.

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  • Thanks!! the problem was that I forgot to index them in phpmyadmin, now works fine :)
    – Naxel21
    Nov 3, 2014 at 12:15

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