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Asked: 2026-06-17T12:11:16+00:00

I’m having problems with a piece of code and wonder if someone can help.

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I’m having problems with a piece of code and wonder if someone can help.

I have a form that submits information to a MySQL database, I have the correct code for checking to see if the submitted product code already exists, and if so shows a warning message and the record is not added.

That code is:

$result = mysql_query("SELECT * FROM listing_1 WHERE product_code='$product_code'");
$num_rows = mysql_num_rows($result);
if ($num_rows) {
   adminwarnmessage("DUPLICATE REFERENCE CODE","FAILURE - <b>$product_name</b> has <b>NOT</b> been added because the reference number already exists.");
}

That works fine for Data Entry, however I have another form that allows users to edit the record, this is what is causing me a problem, as the above code only tells me that there is already a matching record in the database, Of course when I try to save (update) the record it now tells me I can’t because it is a duplicate.

What I would like to happen is that it doesn’t allow users to choose another productcode that already exists, but I want them to be able to update the record using the same product code the form fetched from the database.

Hope that makes sense, any help greatly appreciated.

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1 Answer

  1. Editorial Team

    EDIT
    I have resolved this issue by making $productcode field a unique Index.
    Now when editing if there is a duplicate..

    Mysql does not accept the update query, it returns an error code

    I trap that error code and include it in an if statement…

    if( mysql_errno() == ‘1062’ )

    adminwarnmessage(“DUPLICATE REFERENCE CODE”,”FAILURE – $product_name has NOT been added because the reference number already exists”);

    }
    adminmessage(“Item Updated”, Congratulations you updated $productname succesfully”);

    }

    This now allows editing of $productcode but does not allow it to be changed to one already used in the database.

    Thank you to everyone who took the time to offer help

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