pg_last_oid() is used to retrieve the
OID assigned to an inserted row.
OID field became an optional field from PostgreSQL 7.2 and will not be present by default in PostgreSQL 8.1. When the OID field is not present in a table, the programmer must use pg_result_status() to check for successful insertion.
To get the value of a
SERIAL field in an inserted
row, it is necessary to use the PostgreSQL
function, naming the sequence whose last value is required. If the
name of the sequence is unknown, the
PostgreSQL 8.0 function is necessary.
PostgreSQL 8.1 has a function
LASTVAL that returns
the value of the most recently used sequence in the session. This avoids
the need for naming the sequence, table or column altogether.
This function used to be called pg_getlastoid().
A string containing the OID assigned to the most recently inserted
row in the specified connection, or
FALSE on error or
no available OID.
$pgsql_conn = pg_connect("dbname=mark host=localhost");
$res1 = pg_query("CREATE TABLE test (a INTEGER) WITH OIDS");
$res2 = pg_query("INSERT INTO test VALUES (1)");
$oid = pg_last_oid($res2);