class DatabaseStatement_sqlite

Specific SQLite implementation of DatabaseConnection.

See DatabaseConnection_sqlite::PDOPrepare() for reasons why we must prefetch the data instead of using PDOStatement.


Expanded class hierarchy of DatabaseStatement_sqlite

See also


Related topics


drupal/includes/database/sqlite/, line 391
Database interface code for SQLite embedded database engine.

View source
class DatabaseStatement_sqlite extends DatabaseStatementPrefetch implements Iterator, DatabaseStatementInterface {

   * SQLite specific implementation of getStatement().
   * The PDO SQLite layer doesn't replace numeric placeholders in queries
   * correctly, and this makes numeric expressions (such as COUNT(*) >= :count)
   * fail. We replace numeric placeholders in the query ourselves to work
   * around this bug.
   * See for more details.
  protected function getStatement($query, &$args = array()) {
    if (count($args)) {
      // Check if $args is a simple numeric array.
      if (range(0, count($args) - 1) === array_keys($args)) {
        // In that case, we have unnamed placeholders.
        $count = 0;
        $new_args = array();
        foreach ($args as $value) {
          if (is_float($value) || is_int($value)) {
            if (is_float($value)) {
              // Force the conversion to float so as not to loose precision
              // in the automatic cast.
              $value = sprintf('%F', $value);
            $query = substr_replace($query, $value, strpos($query, '?'), 1);
          else {
            $placeholder = ':db_statement_placeholder_' . $count++;
            $query = substr_replace($query, $placeholder, strpos($query, '?'), 1);
            $new_args[$placeholder] = $value;
        $args = $new_args;
      else {
        // Else, this is using named placeholders.
        foreach ($args as $placeholder => $value) {
          if (is_float($value) || is_int($value)) {
            if (is_float($value)) {
              // Force the conversion to float so as not to loose precision
              // in the automatic cast.
              $value = sprintf('%F', $value);

            // We will remove this placeholder from the query as PDO throws an
            // exception if the number of placeholders in the query and the
            // arguments does not match.
            // PDO allows placeholders to not be prefixed by a colon. See
            // for
            // more.
            if ($placeholder[0] != ':') {
              $placeholder = ":$placeholder";
            // When replacing the placeholders, make sure we search for the
            // exact placeholder. For example, if searching for
            // ':db_placeholder_1', do not replace ':db_placeholder_11'.
            $query = preg_replace('/' . preg_quote($placeholder) . '\b/', $value, $query);

    return $this->dbh->PDOPrepare($query);

  public function execute($args = array(), $options = array()) {
    try {
      $return = parent::execute($args, $options);
    catch (PDOException $e) {
      if (!empty($e->errorInfo[1]) && $e->errorInfo[1] === 17) {
        // The schema has changed. SQLite specifies that we must resend the query.
        $return = parent::execute($args, $options);
      else {
        // Rethrow the exception.
        throw $e;

    // In some weird cases, SQLite will prefix some column names by the name
    // of the table. We post-process the data, by renaming the column names
    // using the same convention as MySQL and PostgreSQL.
    $rename_columns = array();
    foreach ($this->columnNames as $k => $column) {
      // In some SQLite versions, SELECT DISTINCT(field) will return "(field)"
      // instead of "field".
      if (preg_match("/^\((.*)\)$/", $column, $matches)) {
        $rename_columns[$column] = $matches[1];
        $this->columnNames[$k] = $matches[1];
        $column = $matches[1];

      // Remove "table." prefixes.
      if (preg_match("/^.*\.(.*)$/", $column, $matches)) {
        $rename_columns[$column] = $matches[1];
        $this->columnNames[$k] = $matches[1];
    if ($rename_columns) {
      // DatabaseStatementPrefetch already extracted the first row,
      // put it back into the result set.
      if (isset($this->currentRow)) {
        $this->data[0] = &$this->currentRow;

      // Then rename all the columns across the result set.
      foreach ($this->data as $k => $row) {
        foreach ($rename_columns as $old_column => $new_column) {
          $this->data[$k][$new_column] = $this->data[$k][$old_column];

      // Finally, extract the first row again.
      $this->currentRow = $this->data[0];

    return $return;


Contains filters are case sensitive
Namesort descending Modifiers Type Description
DatabaseStatementPrefetch::$columnNames protected property The list of column names in this result set.
DatabaseStatementPrefetch::$currentKey protected property The key of the current row.
DatabaseStatementPrefetch::$currentRow protected property The current row, retrieved in PDO::FETCH_ASSOC format.
DatabaseStatementPrefetch::$data protected property Main data store.
DatabaseStatementPrefetch::$dbh public property Reference to the database connection object for this statement.
DatabaseStatementPrefetch::$defaultFetchOptions protected property Holds supplementary default fetch options.
DatabaseStatementPrefetch::$defaultFetchStyle protected property Holds the default fetch style.
DatabaseStatementPrefetch::$driverOptions protected property Driver-specific options. Can be used by child classes.
DatabaseStatementPrefetch::$fetchOptions protected property Holds supplementary current fetch options (which will be used by the next fetch).
DatabaseStatementPrefetch::$fetchStyle protected property Holds the current fetch style (which will be used by the next fetch).
DatabaseStatementPrefetch::$queryString protected property The query string.
DatabaseStatementPrefetch::$resultRowCount protected property The number of rows in this result set.
DatabaseStatementPrefetch::$rowCount protected property The number of rows affected by the last query.
DatabaseStatementPrefetch::current public function Return the current row formatted according to the current fetch style.
DatabaseStatementPrefetch::fetch public function
DatabaseStatementPrefetch::fetchAll public function
DatabaseStatementPrefetch::fetchAllAssoc public function Returns the result set as an associative array keyed by the given field. Overrides DatabaseStatementInterface::fetchAllAssoc
DatabaseStatementPrefetch::fetchAllKeyed public function Returns the entire result set as a single associative array. Overrides DatabaseStatementInterface::fetchAllKeyed
DatabaseStatementPrefetch::fetchAssoc public function Fetches the next row and returns it as an associative array. Overrides DatabaseStatementInterface::fetchAssoc
DatabaseStatementPrefetch::fetchCol public function Returns an entire single column of a result set as an indexed array. Overrides DatabaseStatementInterface::fetchCol
DatabaseStatementPrefetch::fetchColumn public function
DatabaseStatementPrefetch::fetchField public function Returns a single field from the next record of a result set. Overrides DatabaseStatementInterface::fetchField
DatabaseStatementPrefetch::fetchObject public function
DatabaseStatementPrefetch::getQueryString public function Return the object's SQL query string. Overrides DatabaseStatementInterface::getQueryString
DatabaseStatementPrefetch::key public function
DatabaseStatementPrefetch::next public function
DatabaseStatementPrefetch::rewind public function
DatabaseStatementPrefetch::rowCount public function Returns the number of rows affected by the last SQL statement. Overrides DatabaseStatementInterface::rowCount
DatabaseStatementPrefetch::setFetchMode public function
DatabaseStatementPrefetch::throwPDOException protected function Throw a PDO Exception based on the last PDO error.
DatabaseStatementPrefetch::valid public function
DatabaseStatementPrefetch::__construct public function
DatabaseStatement_sqlite::execute public function Executes a prepared statement. Overrides DatabaseStatementPrefetch::execute
DatabaseStatement_sqlite::getStatement protected function SQLite specific implementation of getStatement(). Overrides DatabaseStatementPrefetch::getStatement