Testing the Success of MySQL Queries in Modifying Database Tables
In crafting applications that interact with databases, it's critical to verify the successful execution of queries that alter data within tables. In PHP, checking the outcome of such queries can pose challenges. Consider the following code snippet:
<code class="php">if($cmd=="deleterec"){
$deleteQuery = "DELETE FROM AUCTIONS1 WHERE ARTICLE_NO = ?";
if ($delRecord = $con->prepare($deleteQuery)) {
$delRecord->bind_param("s", $pk);
$delRecord->execute();
$delRecord->close();
echo "true";
} else {
echo "false";
}
}</code>
This code aims to handle a deletion request and return "true" if successful. However, it solely checks whether the statement is prepared correctly, not whether the record was actually deleted. To rectify this, consider the following approach:
<code class="php">... echo ($delRecord->affected_rows > 0) ? 'true' : 'false'; $delRecord->close();</code>
The affected_rows property returns the number of rows affected by the query. By checking if this value is greater than zero, you can accurately determine whether the record was successfully deleted.
Additionally, it's crucial to appropriately process the result string in your JavaScript code. If this is a source of trouble, providing more details about the JavaScript portion would enable a more comprehensive answer.
The above is the detailed content of How to Verify the Success of MySQL Delete Queries in PHP?. For more information, please follow other related articles on the PHP Chinese website!
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