function db_next_id

Retrieves a unique id.

Use this function if for some reason you can't use a serial field. Using a serial field is preferred, and InsertQuery::execute() returns the value of the last ID inserted.

Parameters

$existing_id: After a database import, it might be that the sequences table is behind, so by passing in a minimum ID, it can be assured that we never issue the same ID.

Return value

An integer number larger than any number returned before for this sequence.

Related topics

Database abstraction layer
Allow the use of different database servers using the same code base.
4 calls to db_next_id()
actions_save in drupal/includes/actions.inc
Saves an action and its user-supplied parameter values to the database.
batch_process in drupal/includes/form.inc
Processes the batch.
DatabaseNextIdCase::testDbNextId in drupal/modules/simpletest/tests/database_test.test
Test that the sequences API work.
user_save in drupal/modules/user/user.module
Save changes to a user account or add a new user.

File

drupal/includes/database/database.inc, line 2712
Core systems for the database layer.

Code

function db_next_id($existing_id = 0) {
  return Database::getConnection()
    ->nextId($existing_id);
}