How to Correctly Retrieve the Inserted Data ID through PHP insert_id When Database Connection is Lost

<span><span><span class="hljs-meta"><?php</span></span><span>
</span><span><span class="hljs-comment">// This part of the code is unrelated to the content, just for illustration</span></span><span>
</span><span><span class="hljs-variable">$unrelatedVar</span></span><span> = </span><span><span class="hljs-string">"This is unrelated PHP code"</span></span><span>;
</span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">dummyFunction</span></span><span>(</span><span><span class="hljs-params"></span></span>) {
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-string">"Hello World!"</span></span><span>;
}
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-title function_ invoke__">dummyFunction</span></span><span>();
</span><span><span class="hljs-meta">?></span></span><span>
<p></span><hr></p>
<p><h2>How to Correctly Retrieve the Inserted Data ID through PHP insert_id When Database Connection is Lost</h2></p>
<h3>3. Using LAST_INSERT_ID() to Avoid Dependence on Connection Objects</h3>
<p>Another method is to use LAST_INSERT_ID() directly in the SQL query. Even if the database connection is lost and reconnected, you can safely retrieve the last inserted ID (as long as it is within the same session).</p>
<pre class=""><code class="php">
// Retrieve ID after inserting data
$mysqli->query("INSERT INTO users (name, email) VALUES ('Bob', '[email protected]')");
$result = $mysqli->query("SELECT LAST_INSERT_ID() AS id");
$row = $result->fetch_assoc();
$insertId = $row['id'];

4. Handling Connection Loss

If a connection is lost during the insertion process, you can ensure data and ID integrity using the following strategies:

• Catch exceptions or errors and log the current operation.
• Re-establish the database connection.
• Use transactions or LAST_INSERT_ID() to retrieve the inserted ID.
• If necessary, query the inserted record's ID using a unique key or other conditions.

5. Summary

When using insert_id in PHP, it is crucial to ensure database connection stability and operation atomicity. Using transactions, LAST_INSERT_ID(), or re-querying the inserted record after failure are effective methods to ensure data consistency and correct ID retrieval.

By using these methods, you can safely and reliably retrieve the inserted data's ID even if the database connection is lost, preventing data inconsistency or loss.