8/28/2023 0 Comments Pdo sqlite autoincrement![]() If the AUTOINCREMENT keyword appears after INTEGER PRIMARY KEY, thatĬhanges the automatic ROWID assignment algorithm to prevent the reuse of ROWIDs over the lifetime of the database. Installation The PDOSQLITE PDO driver is enabled by default. The keyword AUTOINCREMENT can be used with INTEGER field only. ![]() We can auto increment a field value by using AUTOINCREMENT keyword when creating a table with specific column name to auto incrementing it. Note: PDOSQLITE allows using strings apart from streams together with PDO::PARAMLOB. SQLite AUTOINCREMENT is a keyword used for auto incrementing a value of a field in the table. This is true regardless of whether or not the AUTOINCREMENT Introduction PDOSQLITE is a driver that implements the PHP Data Objects (PDO) interface to enable access to SQLite 3 databases. In other words, the purpose of AUTOINCREMENT is to prevent the reuse of ROWIDs from previously deleted rows. On an INSERT, if the ROWID or INTEGER PRIMARY KEY column is not explicitly given a value, then it will be filled automatically with an unused integer, usually one more than the largest ROWID currently in use. If the AUTOINCREMENT keyword appears after INTEGER PRIMARY KEY, that changes the automatic ROWID assignment algorithm to prevent the reuse of ROWIDs over the lifetime of the database. In SQLite, a column with type INTEGER PRIMARY KEY is an alias for the ROWID (except in WITHOUT ROWID tables) which is always a 64-bit signed ![]() The AUTOINCREMENT keyword imposes extra CPU, memory, disk space, andĭisk I/O overhead and should be avoided if not strictly needed. Here is what official SQLite documentation has to say on the subject (bold & italic are mine):
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