Question

This is so baffling I MUST be missing something simple. I have a query that checks to see if the transaction I’m inserting already exists in order to prevent duplicates. Here’s the code:

function isaDupe($portableDB, $transactArray)
{
    $ref = $transactArray["reference"];
    $date = $transactArray["qdate"];
    $time =  $transactArray["time"];

  //prints the query so I can run by hand to test
    print "SELECT `counter` FROM transactions WHERE (`reference` = '$ref' AND `qdate` = '$date' AND `time` = '$time') ";

    if ($dupeSelectStmt = $portableDB->prepare("SELECT `counter` FROM transactions WHERE (`reference` = ? AND `qdate` = ? AND `time` = ?)"))
    {
        $dupeSelectStmt->bind_param('sss',$ref, $date, $time);
        $dupeSelectStmt->bind_result($counter);
        $dupeSelectStmt->execute();

        while ($dupeSelectStmt->fetch())
        {
            break;
        }

        $numRows = $portableDB->affected_rows;

        if ($numRows > 0)
            return TRUE;
        else if ($numRows == -1)
        {
            print " ERROR: ";
            print_r($portableDB->error);
            print_r($dupeSelectStmt->error);
            return FALSE;
        }
        else
            return FALSE;
    }
}

-If I run the query by hand through Workbench on the same server, I get 24 rows returned.

–this is the same if I prepare, set, and execute the statement by hand.

-affected_rows returns -1

–same if I do num_rows on the statement

-there is no error stored on the Statement or MySQLi object.

-if I put a print in the fetch() statement, it prints one row’s worth of data

-if I store the fetched rows into an array and count the results, it’s 1

-I’ve tried running it with each variable separately, same thing.

-other queries on the same server (heck, on the same MySQLi object) are working fine. SELECTS, UPDATES, and INSERTS.

Answer 1

The answer is I was forgetting to call mysqlistmt::store_result after mysqlistmt::execute().

Once I added $dupSelectStmt->store_result(); I was able to call $dupSelectStmt->num_rows and $portableDB->affected_rows and they both showed the 24 I knew I should be seeing.