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Deleting Records with PDO

Use a bound primary key to remove exactly the intended record. rowCount reports affected rows, not guaranteed existence before deletion; never construct identifiers from request strings.

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Executing MySQLi Transactions

Turn a group of MySQLi writes into a commit-or-rollback unit. Use exceptions and rollback on Throwable; transactional storage engines such as InnoDB are required.

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Fetching Objects with PDO

PDO can hydrate query results as objects rather than associative arrays. FETCH_CLASS constructor/typing behavior requires attention; mapping deliberately is often clearer.

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Fetching Rows with PDO

Fetch a PDOStatement result one row at a time or as a bounded array. fetch returns false when rows end; do not mistake it for a valid empty row.

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