Can mysql_insert_id be trusted to retrieve the correct ID in high-frequency insertion scenarios?

Ensuring Accurate ID Retrieval with mysql_insert_id: Is It Safe to Use?

The PHP function mysql_insert_id retrieves the ID of the last record inserted into a database table. However, concerns arise when multiple insertions occur rapidly, raising questions about whether mysql_insert_id can reliably provide the correct ID.

Question:

"Can mysql_insert_id be used to obtain the correct ID when multiple insertions occur frequently in a website?"

Answer:

The MySQL documentation provides reassurance on this matter:

"The ID that was generated is maintained in the server on a per-connection basis... This behavior ensures that each client can retrieve its own ID without concern for the activity of other clients."

In other words, each connection to the database maintains its own ID sequence, ensuring that the ID returned by mysql_insert_id is unique to that connection, regardless of other concurrent insertions. This mechanism eliminates potential conflicts and guarantees accurate ID retrieval.

Conclusion:

Yes, mysql_insert_id is safe to use in scenarios where multiple insertions occur rapidly. The per-connection ID maintenance mechanism ensures that each insertion receives its own unique ID, providing a reliable way to identify newly created records.

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