Why doesn't PDO's Oracle driver implement lastInsertId()?

Question

I get this error in PDO:

error: Message: PDO::lastInsertId() [pdo.lastinsertid]: SQLSTATE[IM001]: Driver does not support this function: driver does not support lastInsertId()

when trying to get last inserted id from an oracle database. I added the sequence string to the last insert id function but still not working. Google doesn't say much regarding this error on Oracle with PDO.

Answer 1

Oracle doesn't have autoincrement columns, so lastInsertId isn't supported in the same way as for MySQL. You have to implement the equivalent "by hand" using Oracle sequences.

Create an oracle sequence for every table that requires it, and use NEXTVAL to retrieve it whenever you need to do an insert, then use that value when inserting in the table.

$sh = $conn->prepare('SELECT uid_seq.NEXTVAL AS nextInsertID FROM DUAL');
$sh->execute();
$nextInsertId = $sh->fetchColumn(0);

$sh = $conn->prepare("INSERT INTO table (id, data) VALUES(?, 255)");
$sh->execute(array($nextInsertId));

Answer 2

In Oracle, you should have created an oracle sequence for tables which requires an auto increment column.

If you want to insert, then you can do it in the same time rather than query nextIncrementId and insert as below:

$sh = $conn->prepare("INSERT INTO table (id, data) VALUES(SEQUENCE_NAME.NEXTVAL, ?)");
$sh->execute(array($valueToBeInsertedInDataColumn));

If you just want to know the last insert id, then don't use nextval because whenever you call it, it increment the value to the next one. You should use CURRVAL for that purpose. Below is an example:

$sh = $conn->prepare("SELECT SEQUENCE_NAME.CURRVAL AS lastInsertId FROM DUAL");
$lastInserId = $sh->execute();

Debug: print_r($lastInserId);