How Can I Reliably Check the Success of a MySQL DELETE Query in PHP?

Determining the Success of MySQL Query in Modifying Database Tables

In PHP, to ascertain the success of a MySQL query that aims to modify table data, one faces the dilemma of identifying any potential errors or assessing the impact of the operation. This article addresses how to retrieve accurate information about the outcome of such queries.

Case Study: Deletion of Articles

Consider the following PHP code snippet that attempts to delete an article from a database:

if($cmd=="deleterec"){
    $deleteQuery = "DELETE FROM AUCTIONS1 WHERE ARTICLE_NO = ?";
    if ($delRecord = $con->prepare($deleteQuery)) {
        $delRecord->bind_param("s", $pk);
        $delRecord->execute();
        $delRecord->close();
        echo "true";
    } else {
        echo "false";
    }
}

Flaws and the Correct Approach

Initially, the code above only verifies whether the SQL statement is prepared correctly, failing to check if the record deletion was successful.

To resolve this, consider the following modification:

echo ($delRecord->affected_rows > 0) ? 'true' : 'false';
$delRecord->close();

The expression $delRecord->affected_rows provides the number of rows affected by the query. By checking if it exceeds zero, we can determine if any records were deleted successfully.

Additional Considerations

While this approach checks the query execution outcome, it's crucial to note that the JavaScript code receiving the result string from PHP must be configured to handle 'true' or 'false' appropriately to update the page via AJAX. Further investigation may be required to address any issues encountered during this process.

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