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Command: sqlite3_last_insert_rowid | Section: 3 | Source: NetBSD | File: sqlite3_last_insert_rowid.3
SQLITE3_LAST_INSERT_ROWID(3) FreeBSD Library Functions Manual
NAME
sqlite3_last_insert_rowid - Last Insert Rowid
SYNOPSIS
sqlite3_int64
sqlite3_last_insert_rowid(sqlite3*);
DESCRIPTION
Each entry in most SQLite tables (except for WITHOUT ROWID tables) has a
unique 64-bit signed integer key called the "rowid". The rowid is
always available as an undeclared column named ROWID, OID, or _ROWID_ as
long as those names are not also used by explicitly declared columns. If
the table has a column of type INTEGER PRIMARY KEY then that column is
another alias for the rowid.
The sqlite3_last_insert_rowid(D) interface usually returns the rowid of
the most recent successful INSERT into a rowid table or virtual table on
database connection D. Inserts into WITHOUT ROWID tables are not
recorded. If no successful INSERTs into rowid tables have ever occurred
on the database connection D, then sqlite3_last_insert_rowid(D) returns
zero.
As well as being set automatically as rows are inserted into database
tables, the value returned by this function may be set explicitly by
sqlite3_set_last_insert_rowid()
Some virtual table implementations may INSERT rows into rowid tables as
part of committing a transaction (e.g. to flush data accumulated in
memory to disk). In this case subsequent calls to this function return
the rowid associated with these internal INSERT operations, which leads
to unintuitive results. Virtual table implementations that do write to
rowid tables in this way can avoid this problem by restoring the original
rowid value using sqlite3_set_last_insert_rowid() before returning
control to the user.
If an INSERT occurs within a trigger then this routine will return the
rowid of the inserted row as long as the trigger is running. Once the
trigger program ends, the value returned by this routine reverts to what
it was before the trigger was fired.
An INSERT that fails due to a constraint violation is not a successful
INSERT and does not change the value returned by this routine. Thus
INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK, and INSERT OR ABORT
make no changes to the return value of this routine when their insertion
fails. When INSERT OR REPLACE encounters a constraint violation, it does
not fail. The INSERT continues to completion after deleting rows that
caused the constraint problem so INSERT OR REPLACE will always change the
return value of this interface.
For the purposes of this routine, an INSERT is considered to be
successful even if it is subsequently rolled back.
This function is accessible to SQL statements via the last_insert_rowid()
SQL function.
If a separate thread performs a new INSERT on the same database
connection while the sqlite3_last_insert_rowid() function is running and
thus changes the last insert rowid, then the value returned by
sqlite3_last_insert_rowid() is unpredictable and might not equal either
the old or the new last insert rowid.
SEE ALSO
sqlite3_last_insert_rowid(3), sqlite3_set_last_insert_rowid(3)
FreeBSD 14.1-RELEASE-p8 December 19, 2018 FreeBSD 14.1-RELEASE-p8