diff options
Diffstat (limited to 'includes/database/sqlite')
| -rw-r--r-- | includes/database/sqlite/database.inc | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/includes/database/sqlite/database.inc b/includes/database/sqlite/database.inc index e762a6ba7..eaeacb32d 100644 --- a/includes/database/sqlite/database.inc +++ b/includes/database/sqlite/database.inc @@ -167,6 +167,27 @@ class DatabaseConnection_sqlite extends DatabaseConnection { // DatabaseStatement_sqlite::execute() and cannot be cached. return $this->prepare($this->prefixTables($query)); } + + public function nextId($existing_id = 0) { + $transaction = $this->startTransaction(); + // We can safely use literal queries here instead of the slower query + // builder because if a given database breaks here then it can simply + // override nextId. However, this is unlikely as we deal with short strings + // and integers and no known databases require special handling for those + // simple cases. If another transaction wants to write the same row, it will + // wait until this transaction commits. + $stmt = $this->query('UPDATE {sequences} SET value = GREATEST(value, :existing_id) + 1', array( + ':existing_id' => $existing_id, + )); + if (!$stmt->rowCount()) { + $this->query('INSERT INTO {sequences} (value) VALUES (:existing_id + 1)', array( + ':existing_id' => $existing_id, + )); + } + // The transaction gets committed when the transaction object gets destroyed + // because it gets out of scope. + return $new_value; + } } /** |