function NativeUpsert::execute

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

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;
}