function InsertQuery_pgsql::execute

Overrides InsertQuery::execute

File

includes/database/pgsql/query.inc, line 16

Class

InsertQuery_pgsql

@file Query code for PostgreSQL embedded database engine.

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 = array();
    $blob_count = 0;
    foreach ($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], (string) $insert_values[$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];
                    // Force $last_insert_id to the specified value. This is only done
                    // if $index is 0.
                    if ($index == 0) {
                        $last_insert_id = $serial_value;
                    }
                    // 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 . "}", array(
                        ':serial_value' => (int) $serial_value,
                    ));
                }
            }
        }
    }
    if (!empty($this->fromQuery)) {
        // bindParam stores only a reference to the variable that is followed when
        // the statement is executed. We pass $arguments[$key] instead of $value
        // because the second argument to bindParam is passed by reference and
        // the foreach statement assigns the element to the existing reference.
        $arguments = $this->fromQuery
            ->getArguments();
        foreach ($arguments as $key => $value) {
            $stmt->bindParam($key, $arguments[$key]);
        }
    }
    // PostgreSQL requires the table name to be specified explicitly
    // when requesting the last insert ID, so we pass that in via
    // the options array.
    $options = $this->queryOptions;
    if (!empty($table_information->sequences)) {
        $options['sequence_name'] = $table_information->sequences[0];
    }
    elseif ($options['return'] == Database::RETURN_INSERT_ID) {
        $options['return'] = Database::RETURN_NULL;
    }
    // Only use the returned last_insert_id if it is not already set.
    if (!empty($last_insert_id)) {
        $this->connection
            ->query($stmt, array(), $options);
    }
    else {
        $last_insert_id = $this->connection
            ->query($stmt, array(), $options);
    }
    // Re-initialize the values array so that we can re-use this query.
    $this->insertValues = array();
    return $last_insert_id;
}