function Upsert::execute

Overrides Upsert::execute

File

core/lib/Drupal/Core/Database/Driver/pgsql/Upsert.php, line 15

Class

Upsert

PostgreSQL implementation of \Drupal\Core\Database\Query\Upsert.

Namespace

Code

public function execute() {
    if (!$this->preExecute()) {
        return NULL;
    }
    // Default options for upsert queries.
    $this->queryOptions += [
        'throw_exception' => TRUE,
    ];
    // Default fields are always placed first for consistency.
    $insert_fields = array_merge($this->defaultFields, $this->insertFields);
    $table = $this->connection
        ->escapeTable($this->table);
    // We have to execute multiple queries, therefore we wrap everything in a
    // transaction so that it is atomic where possible.
    $transaction = $this->connection
        ->startTransaction();
    try {
        // First, lock the table we're upserting into.
        $this->connection
            ->query('LOCK TABLE {' . $table . '} IN SHARE ROW EXCLUSIVE MODE', [], $this->queryOptions);
        // Second, delete all items first so we can do one insert.
        $unique_key_position = array_search($this->key, $insert_fields);
        $delete_ids = [];
        foreach ($this->insertValues as $insert_values) {
            $delete_ids[] = $insert_values[$unique_key_position];
        }
        // Delete in chunks when a large array is passed.
        foreach (array_chunk($delete_ids, 1000) as $delete_ids_chunk) {
            $this->connection
                ->delete($this->table, $this->queryOptions)
                ->condition($this->key, $delete_ids_chunk, 'IN')
                ->execute();
        }
        // Third, insert all the values.
        $insert = $this->connection
            ->insert($this->table, $this->queryOptions)
            ->fields($insert_fields);
        foreach ($this->insertValues as $insert_values) {
            $insert->values($insert_values);
        }
        $insert->execute();
    } catch (\Exception $e) {
        // One of the queries failed, rollback the whole batch.
        $transaction->rollBack();
        // Rethrow the exception for the calling code.
        throw $e;
    }
    // Re-initialize the values array so that we can re-use this query.
    $this->insertValues = [];
    // Transaction commits here where $transaction looses scope.
    return TRUE;
}