public function SelectQueryExtender::forUpdate in Drupal 7

Add FOR UPDATE to the query.

FOR UPDATE prevents the rows retrieved by the SELECT statement from being modified or deleted by other transactions until the current transaction ends. Other transactions that attempt UPDATE, DELETE, or SELECT FOR UPDATE of these rows will be blocked until the current transaction ends.

Parameters

$set: IF TRUE, FOR UPDATE will be added to the query, if FALSE then it won't.

Return value

QueryConditionInterface The called object.

Overrides SelectQueryInterface::forUpdate

File

includes/database/select.inc, line 790

Class

SelectQueryExtender

The base extender class for Select queries.

Code

public function forUpdate($set = TRUE) {
  $this->query
    ->forUpdate($set);
  return $this;
}