public function NativeUpsert::execute in Drupal 8

Runs the query against the database.

Return value

\Drupal\Core\Database\StatementInterface|null A prepared statement, or NULL if the query is not valid.

Overrides Upsert::execute

File

core/lib/Drupal/Core/Database/Driver/pgsql/NativeUpsert.php, line 17

Class

NativeUpsert

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

Namespace

Drupal\Core\Database\Driver\pgsql

Code

public function execute() {
  if (!$this
    ->preExecute()) {
    return NULL;
  }
  $stmt = $this->connection
    ->prepareQuery((string) $this);

  // Fetch the list of blobs and sequences used on that table.
  $table_information = $this->connection
    ->schema()
    ->queryTableInformation($this->table);
  $max_placeholder = 0;
  $blobs = [];
  $blob_count = 0;
  foreach ($this->insertValues as $insert_values) {
    foreach ($this->insertFields as $idx => $field) {
      if (isset($table_information->blob_fields[$field])) {
        $blobs[$blob_count] = fopen('php://memory', 'a');
        fwrite($blobs[$blob_count], $insert_values[$idx]);
        rewind($blobs[$blob_count]);
        $stmt
          ->bindParam(':db_insert_placeholder_' . $max_placeholder++, $blobs[$blob_count], \PDO::PARAM_LOB);

        // Pre-increment is faster in PHP than increment.
        ++$blob_count;
      }
      else {
        $stmt
          ->bindParam(':db_insert_placeholder_' . $max_placeholder++, $insert_values[$idx]);
      }
    }

    // Check if values for a serial field has been passed.
    if (!empty($table_information->serial_fields)) {
      foreach ($table_information->serial_fields as $index => $serial_field) {
        $serial_key = array_search($serial_field, $this->insertFields);
        if ($serial_key !== FALSE) {
          $serial_value = $insert_values[$serial_key];

          // Sequences must be greater than or equal to 1.
          if ($serial_value === NULL || !$serial_value) {
            $serial_value = 1;
          }

          // Set the sequence to the bigger value of either the passed
          // value or the max value of the column. It can happen that another
          // thread calls nextval() which could lead to a serial number being
          // used twice. However, trying to insert a value into a serial
          // column should only be done in very rare cases and is not thread
          // safe by definition.
          $this->connection
            ->query("SELECT setval('" . $table_information->sequences[$index] . "', GREATEST(MAX(" . $serial_field . "), :serial_value)) FROM {" . $this->table . "}", [
            ':serial_value' => (int) $serial_value,
          ]);
        }
      }
    }
  }
  $options = $this->queryOptions;
  if (!empty($table_information->sequences)) {
    $options['sequence_name'] = $table_information->sequences[0];
  }

  // Re-initialize the values array so that we can re-use this query.
  $this->insertValues = [];

  // Create a savepoint so we can rollback a failed query. This is so we can
  // mimic MySQL and SQLite transactions which don't fail if a single query
  // fails. This is important for tables that are created on demand. For
  // example, \Drupal\Core\Cache\DatabaseBackend.
  $this->connection
    ->addSavepoint();
  try {
    $this->connection
      ->query($stmt, [], $options);
    $this->connection
      ->releaseSavepoint();
  } catch (\Exception $e) {
    $this->connection
      ->rollbackSavepoint();
    throw $e;
  }
  return TRUE;
}