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class DatabaseConnection_mysql in Drupal 7

Hierarchy

Expanded class hierarchy of DatabaseConnection_mysql

Related topics

File

includes/database/mysql/database.inc, line 18
Database interface code for MySQL database servers.

View source
class DatabaseConnection_mysql extends DatabaseConnection {

  /**
   * Flag to indicate if the cleanup function in __destruct() should run.
   *
   * @var boolean
   */
  protected $needsCleanup = FALSE;

  /**
   * The list of MySQL reserved key words.
   *
   * @link https://dev.mysql.com/doc/refman/8.0/en/keywords.html
   */
  private $reservedKeyWords = array(
    'accessible',
    'add',
    'admin',
    'all',
    'alter',
    'analyze',
    'and',
    'as',
    'asc',
    'asensitive',
    'before',
    'between',
    'bigint',
    'binary',
    'blob',
    'both',
    'by',
    'call',
    'cascade',
    'case',
    'change',
    'char',
    'character',
    'check',
    'collate',
    'column',
    'condition',
    'constraint',
    'continue',
    'convert',
    'create',
    'cross',
    'cube',
    'cume_dist',
    'current_date',
    'current_time',
    'current_timestamp',
    'current_user',
    'cursor',
    'database',
    'databases',
    'day_hour',
    'day_microsecond',
    'day_minute',
    'day_second',
    'dec',
    'decimal',
    'declare',
    'default',
    'delayed',
    'delete',
    'dense_rank',
    'desc',
    'describe',
    'deterministic',
    'distinct',
    'distinctrow',
    'div',
    'double',
    'drop',
    'dual',
    'each',
    'else',
    'elseif',
    'empty',
    'enclosed',
    'escaped',
    'except',
    'exists',
    'exit',
    'explain',
    'false',
    'fetch',
    'first_value',
    'float',
    'float4',
    'float8',
    'for',
    'force',
    'foreign',
    'from',
    'fulltext',
    'function',
    'generated',
    'get',
    'grant',
    'group',
    'grouping',
    'groups',
    'having',
    'high_priority',
    'hour_microsecond',
    'hour_minute',
    'hour_second',
    'if',
    'ignore',
    'in',
    'index',
    'infile',
    'inner',
    'inout',
    'insensitive',
    'insert',
    'int',
    'int1',
    'int2',
    'int3',
    'int4',
    'int8',
    'integer',
    'interval',
    'into',
    'io_after_gtids',
    'io_before_gtids',
    'is',
    'iterate',
    'join',
    'json_table',
    'key',
    'keys',
    'kill',
    'lag',
    'last_value',
    'lead',
    'leading',
    'leave',
    'left',
    'like',
    'limit',
    'linear',
    'lines',
    'load',
    'localtime',
    'localtimestamp',
    'lock',
    'long',
    'longblob',
    'longtext',
    'loop',
    'low_priority',
    'master_bind',
    'master_ssl_verify_server_cert',
    'match',
    'maxvalue',
    'mediumblob',
    'mediumint',
    'mediumtext',
    'middleint',
    'minute_microsecond',
    'minute_second',
    'mod',
    'modifies',
    'natural',
    'not',
    'no_write_to_binlog',
    'nth_value',
    'ntile',
    'null',
    'numeric',
    'of',
    'on',
    'optimize',
    'optimizer_costs',
    'option',
    'optionally',
    'or',
    'order',
    'out',
    'outer',
    'outfile',
    'over',
    'partition',
    'percent_rank',
    'persist',
    'persist_only',
    'precision',
    'primary',
    'procedure',
    'purge',
    'range',
    'rank',
    'read',
    'reads',
    'read_write',
    'real',
    'recursive',
    'references',
    'regexp',
    'release',
    'rename',
    'repeat',
    'replace',
    'require',
    'resignal',
    'restrict',
    'return',
    'revoke',
    'right',
    'rlike',
    'row',
    'rows',
    'row_number',
    'schema',
    'schemas',
    'second_microsecond',
    'select',
    'sensitive',
    'separator',
    'set',
    'show',
    'signal',
    'smallint',
    'spatial',
    'specific',
    'sql',
    'sqlexception',
    'sqlstate',
    'sqlwarning',
    'sql_big_result',
    'sql_calc_found_rows',
    'sql_small_result',
    'ssl',
    'starting',
    'stored',
    'straight_join',
    'system',
    'table',
    'terminated',
    'then',
    'tinyblob',
    'tinyint',
    'tinytext',
    'to',
    'trailing',
    'trigger',
    'true',
    'undo',
    'union',
    'unique',
    'unlock',
    'unsigned',
    'update',
    'usage',
    'use',
    'using',
    'utc_date',
    'utc_time',
    'utc_timestamp',
    'values',
    'varbinary',
    'varchar',
    'varcharacter',
    'varying',
    'virtual',
    'when',
    'where',
    'while',
    'window',
    'with',
    'write',
    'xor',
    'year_month',
    'zerofill',
  );
  public function __construct(array $connection_options = array()) {

    // This driver defaults to transaction support, except if explicitly passed FALSE.
    $this->transactionSupport = !isset($connection_options['transactions']) || $connection_options['transactions'] !== FALSE;

    // MySQL never supports transactional DDL.
    $this->transactionalDDLSupport = FALSE;
    $this->connectionOptions = $connection_options;
    $charset = 'utf8';

    // Check if the charset is overridden to utf8mb4 in settings.php.
    if ($this
      ->utf8mb4IsActive()) {
      $charset = 'utf8mb4';
    }

    // The DSN should use either a socket or a host/port.
    if (isset($connection_options['unix_socket'])) {
      $dsn = 'mysql:unix_socket=' . $connection_options['unix_socket'];
    }
    else {

      // Default to TCP connection on port 3306.
      $dsn = 'mysql:host=' . $connection_options['host'] . ';port=' . (empty($connection_options['port']) ? 3306 : $connection_options['port']);
    }

    // Character set is added to dsn to ensure PDO uses the proper character
    // set when escaping. This has security implications. See
    // https://www.drupal.org/node/1201452 for further discussion.
    $dsn .= ';charset=' . $charset;
    $dsn .= ';dbname=' . $connection_options['database'];

    // Allow PDO options to be overridden.
    $connection_options += array(
      'pdo' => array(),
    );
    $connection_options['pdo'] += array(
      // So we don't have to mess around with cursors and unbuffered queries by default.
      PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE,
      // Because MySQL's prepared statements skip the query cache, because it's dumb.
      PDO::ATTR_EMULATE_PREPARES => TRUE,
    );
    if (defined('PDO::MYSQL_ATTR_MULTI_STATEMENTS')) {

      // An added connection option in PHP 5.5.21+ to optionally limit SQL to a
      // single statement like mysqli.
      $connection_options['pdo'] += array(
        PDO::MYSQL_ATTR_MULTI_STATEMENTS => FALSE,
      );
    }
    parent::__construct($dsn, $connection_options['username'], $connection_options['password'], $connection_options['pdo']);

    // Force MySQL to use the UTF-8 character set. Also set the collation, if a
    // certain one has been set; otherwise, MySQL defaults to 'utf8_general_ci'
    // for UTF-8.
    if (!empty($connection_options['collation'])) {
      $this->connection
        ->exec('SET NAMES ' . $charset . ' COLLATE ' . $connection_options['collation']);
    }
    else {
      $this->connection
        ->exec('SET NAMES ' . $charset);
    }

    // Set MySQL init_commands if not already defined.  Default Drupal's MySQL
    // behavior to conform more closely to SQL standards.  This allows Drupal
    // to run almost seamlessly on many different kinds of database systems.
    // These settings force MySQL to behave the same as postgresql, or sqlite
    // in regards to syntax interpretation and invalid data handling.  See
    // http://drupal.org/node/344575 for further discussion. Also, as MySQL 5.5
    // changed the meaning of TRADITIONAL we need to spell out the modes one by
    // one.
    $connection_options += array(
      'init_commands' => array(),
    );
    $sql_mode = 'REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO';

    // NO_AUTO_CREATE_USER was removed in MySQL 8.0.11
    // https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-11.html#mysqld-8-0-11-deprecation-removal
    if (version_compare($this->connection
      ->getAttribute(PDO::ATTR_SERVER_VERSION), '8.0.11', '<')) {
      $sql_mode .= ',NO_AUTO_CREATE_USER';
    }
    $connection_options['init_commands'] += array(
      'sql_mode' => "SET sql_mode = '{$sql_mode}'",
    );

    // Execute initial commands.
    foreach ($connection_options['init_commands'] as $sql) {
      $this->connection
        ->exec($sql);
    }
  }

  /**
   * {@inheritdoc}}
   */
  protected function setPrefix($prefix) {
    parent::setPrefix($prefix);

    // Successive versions of MySQL have become increasingly strict about the
    // use of reserved keywords as table names. Drupal 7 uses at least one such
    // table (system). Therefore we surround all table names with quotes.
    $quote_char = variable_get('mysql_identifier_quote_character', MYSQL_IDENTIFIER_QUOTE_CHARACTER_DEFAULT);
    foreach ($this->prefixSearch as $i => $prefixSearch) {
      if (substr($prefixSearch, 0, 1) === '{') {

        // If the prefix already contains one or more quotes remove them.
        // This can happen when - for example - DrupalUnitTestCase sets up a
        // "temporary prefixed database". Also if there's a dot in the prefix,
        // wrap it in quotes to cater for schema names in prefixes.
        $search = array(
          $quote_char,
          '.',
        );
        $replace = array(
          '',
          $quote_char . '.' . $quote_char,
        );
        $this->prefixReplace[$i] = $quote_char . str_replace($search, $replace, $this->prefixReplace[$i]);
      }
      if (substr($prefixSearch, -1) === '}') {
        $this->prefixReplace[$i] .= $quote_char;
      }
    }
  }

  /**
   * {@inheritdoc}
   */
  public function escapeField($field) {
    $field = parent::escapeField($field);
    return $this
      ->quoteIdentifier($field);
  }
  public function escapeFields(array $fields) {
    foreach ($fields as &$field) {
      $field = $this
        ->escapeField($field);
    }
    return $fields;
  }

  /**
   * {@inheritdoc}
   */
  public function escapeAlias($field) {
    $field = parent::escapeAlias($field);
    return $this
      ->quoteIdentifier($field);
  }

  /**
   * Quotes an identifier if it matches a MySQL reserved keyword.
   *
   * @param string $identifier
   *   The field to check.
   *
   * @return string
   *   The identifier, quoted if it matches a MySQL reserved keyword.
   */
  private function quoteIdentifier($identifier) {

    // Quote identifiers so that MySQL reserved words like 'function' can be
    // used as column names. Sometimes the 'table.column_name' format is passed
    // in. For example, menu_load_links() adds a condition on "ml.menu_name".
    if (strpos($identifier, '.') !== FALSE) {
      list($table, $identifier) = explode('.', $identifier, 2);
    }
    if (in_array(strtolower($identifier), $this->reservedKeyWords, TRUE)) {

      // Quote the string for MySQL reserved keywords.
      $quote_char = variable_get('mysql_identifier_quote_character', MYSQL_IDENTIFIER_QUOTE_CHARACTER_DEFAULT);
      $identifier = $quote_char . $identifier . $quote_char;
    }
    return isset($table) ? $table . '.' . $identifier : $identifier;
  }
  public function __destruct() {
    if ($this->needsCleanup) {
      $this
        ->nextIdDelete();
    }
  }
  public function queryRange($query, $from, $count, array $args = array(), array $options = array()) {
    return $this
      ->query($query . ' LIMIT ' . (int) $from . ', ' . (int) $count, $args, $options);
  }
  public function queryTemporary($query, array $args = array(), array $options = array()) {
    $tablename = $this
      ->generateTemporaryTableName();
    $this
      ->query('CREATE TEMPORARY TABLE {' . $tablename . '} Engine=MEMORY ' . $query, $args, $options);
    return $tablename;
  }
  public function driver() {
    return 'mysql';
  }
  public function databaseType() {
    return 'mysql';
  }
  public function mapConditionOperator($operator) {

    // We don't want to override any of the defaults.
    return NULL;
  }
  public function nextId($existing_id = 0) {
    $new_id = $this
      ->query('INSERT INTO {sequences} () VALUES ()', array(), array(
      'return' => Database::RETURN_INSERT_ID,
    ));

    // This should only happen after an import or similar event.
    if ($existing_id >= $new_id) {

      // If we INSERT a value manually into the sequences table, on the next
      // INSERT, MySQL will generate a larger value. However, there is no way
      // of knowing whether this value already exists in the table. MySQL
      // provides an INSERT IGNORE which would work, but that can mask problems
      // other than duplicate keys. Instead, we use INSERT ... ON DUPLICATE KEY
      // UPDATE in such a way that the UPDATE does not do anything. This way,
      // duplicate keys do not generate errors but everything else does.
      $this
        ->query('INSERT INTO {sequences} (value) VALUES (:value) ON DUPLICATE KEY UPDATE value = value', array(
        ':value' => $existing_id,
      ));
      $new_id = $this
        ->query('INSERT INTO {sequences} () VALUES ()', array(), array(
        'return' => Database::RETURN_INSERT_ID,
      ));
    }
    $this->needsCleanup = TRUE;
    return $new_id;
  }
  public function nextIdDelete() {

    // While we want to clean up the table to keep it up from occupying too
    // much storage and memory, we must keep the highest value in the table
    // because InnoDB  uses an in-memory auto-increment counter as long as the
    // server runs. When the server is stopped and restarted, InnoDB
    // reinitializes the counter for each table for the first INSERT to the
    // table based solely on values from the table so deleting all values would
    // be a problem in this case. Also, TRUNCATE resets the auto increment
    // counter.
    try {
      $max_id = $this
        ->query('SELECT MAX(value) FROM {sequences}')
        ->fetchField();

      // We know we are using MySQL here, no need for the slower db_delete().
      $this
        ->query('DELETE FROM {sequences} WHERE value < :value', array(
        ':value' => $max_id,
      ));
    } catch (PDOException $e) {
    }
  }

  /**
   * Overridden to work around issues to MySQL not supporting transactional DDL.
   */
  protected function popCommittableTransactions() {

    // Commit all the committable layers.
    foreach (array_reverse($this->transactionLayers) as $name => $active) {

      // Stop once we found an active transaction.
      if ($active) {
        break;
      }

      // If there are no more layers left then we should commit.
      unset($this->transactionLayers[$name]);
      if (empty($this->transactionLayers)) {
        if (!$this
          ->doCommit()) {
          throw new DatabaseTransactionCommitFailedException();
        }
      }
      else {

        // Attempt to release this savepoint in the standard way.
        try {
          $this
            ->query('RELEASE SAVEPOINT ' . $name);
        } catch (PDOException $e) {

          // However, in MySQL (InnoDB), savepoints are automatically committed
          // when tables are altered or created (DDL transactions are not
          // supported). This can cause exceptions due to trying to release
          // savepoints which no longer exist.
          //
          // To avoid exceptions when no actual error has occurred, we silently
          // succeed for MySQL error code 1305 ("SAVEPOINT does not exist").
          if ($e->errorInfo[1] == '1305') {

            // If one SAVEPOINT was released automatically, then all were.
            // Therefore, clean the transaction stack.
            $this->transactionLayers = array();

            // We also have to explain to PDO that the transaction stack has
            // been cleaned-up.
            $this
              ->doCommit();
          }
          else {
            throw $e;
          }
        }
      }
    }
  }

  /**
   * Do the actual commit, including a workaround for PHP 8 behaviour changes.
   *
   * @return bool
   *   Success or otherwise of the commit.
   */
  protected function doCommit() {
    if ($this->connection
      ->inTransaction()) {
      return $this->connection
        ->commit();
    }
    else {

      // In PHP 8.0 a PDOException is thrown when a commit is attempted with no
      // transaction active. In previous PHP versions this failed silently.
      return TRUE;
    }
  }

  /**
   * {@inheritdoc}
   */
  public function rollback($savepoint_name = 'drupal_transaction') {

    // MySQL will automatically commit transactions when tables are altered or
    // created (DDL transactions are not supported). Prevent triggering an
    // exception to ensure that the error that has caused the rollback is
    // properly reported.
    if (!$this->connection
      ->inTransaction()) {

      // Before PHP 8 $this->connection->inTransaction() will return TRUE and
      // $this->connection->rollback() does not throw an exception; the
      // following code is unreachable.
      // If \DatabaseConnection::rollback() would throw an
      // exception then continue to throw an exception.
      if (!$this
        ->inTransaction()) {
        throw new DatabaseTransactionNoActiveException();
      }

      // A previous rollback to an earlier savepoint may mean that the savepoint
      // in question has already been accidentally committed.
      if (!isset($this->transactionLayers[$savepoint_name])) {
        throw new DatabaseTransactionNoActiveException();
      }
      trigger_error('Rollback attempted when there is no active transaction. This can cause data integrity issues.', E_USER_WARNING);
      return;
    }
    return parent::rollback($savepoint_name);
  }
  public function utf8mb4IsConfigurable() {
    return TRUE;
  }
  public function utf8mb4IsActive() {
    return isset($this->connectionOptions['charset']) && $this->connectionOptions['charset'] === 'utf8mb4';
  }
  public function utf8mb4IsSupported() {

    // Ensure that the MySQL driver supports utf8mb4 encoding.
    $version = $this->connection
      ->getAttribute(PDO::ATTR_CLIENT_VERSION);
    if (strpos($version, 'mysqlnd') !== FALSE) {

      // The mysqlnd driver supports utf8mb4 starting at version 5.0.9.
      $version = preg_replace('/^\\D+([\\d.]+).*/', '$1', $version);
      if (version_compare($version, '5.0.9', '<')) {
        return FALSE;
      }
    }
    else {

      // The libmysqlclient driver supports utf8mb4 starting at version 5.5.3.
      if (version_compare($version, '5.5.3', '<')) {
        return FALSE;
      }
    }

    // Ensure that the MySQL server supports large prefixes and utf8mb4.
    try {
      $this
        ->query("CREATE TABLE {drupal_utf8mb4_test} (id VARCHAR(255), PRIMARY KEY(id(255))) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci ROW_FORMAT=DYNAMIC ENGINE=INNODB");
    } catch (Exception $e) {
      return FALSE;
    }
    $this
      ->query("DROP TABLE {drupal_utf8mb4_test}");
    return TRUE;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
DatabaseConnection::$connection protected property The actual PDO connection.
DatabaseConnection::$connectionOptions protected property The connection information for this connection object.
DatabaseConnection::$driverClasses protected property Index of what driver-specific class to use for various operations.
DatabaseConnection::$escapedAliases protected property List of escaped aliases names, keyed by unescaped aliases.
DatabaseConnection::$escapedNames protected property List of escaped database, table, and field names, keyed by unescaped names.
DatabaseConnection::$key protected property The key representing this connection.
DatabaseConnection::$logger protected property The current database logging object for this connection.
DatabaseConnection::$prefixes protected property The prefixes used by this database connection.
DatabaseConnection::$prefixReplace protected property List of replacement values for use in prefixTables().
DatabaseConnection::$prefixSearch protected property List of search values for use in prefixTables().
DatabaseConnection::$schema protected property The schema object for this connection.
DatabaseConnection::$statementClass protected property The name of the Statement class for this connection.
DatabaseConnection::$target protected property The database target this connection is for.
DatabaseConnection::$temporaryNameIndex protected property An index used to generate unique temporary table names.
DatabaseConnection::$transactionalDDLSupport protected property Whether this database connection supports transactional DDL.
DatabaseConnection::$transactionLayers protected property Tracks the number of "layers" of transactions currently active.
DatabaseConnection::$transactionSupport protected property Whether this database connection supports transactions.
DatabaseConnection::$unprefixedTablesMap protected property List of un-prefixed table names, keyed by prefixed table names.
DatabaseConnection::commit public function Throws an exception to deny direct access to transaction commits.
DatabaseConnection::defaultOptions protected function Returns the default query options for any given query.
DatabaseConnection::delete public function Prepares and returns a DELETE query object.
DatabaseConnection::destroy public function Destroys this Connection object.
DatabaseConnection::escapeLike public function Escapes characters that work as wildcard characters in a LIKE pattern.
DatabaseConnection::escapeTable public function Escapes a table name string.
DatabaseConnection::expandArguments protected function Expands out shorthand placeholders.
DatabaseConnection::filterComment protected function Sanitize a query comment string.
DatabaseConnection::generateTemporaryTableName protected function Generates a temporary table name.
DatabaseConnection::getConnectionOptions public function Returns the connection information for this connection object.
DatabaseConnection::getDriverClass public function Gets the driver-specific override class if any for the specified class.
DatabaseConnection::getKey public function Returns the key this connection is associated with.
DatabaseConnection::getLogger public function Gets the current logging object for this connection.
DatabaseConnection::getTarget public function Returns the target this connection is associated with.
DatabaseConnection::getUnprefixedTablesMap public function Gets a list of individually prefixed table names.
DatabaseConnection::insert public function Prepares and returns an INSERT query object.
DatabaseConnection::inTransaction public function Determines if there is an active transaction open.
DatabaseConnection::makeComment public function Flatten an array of query comments into a single comment string.
DatabaseConnection::makeSequenceName public function Creates the appropriate sequence name for a given table and serial field.
DatabaseConnection::merge public function Prepares and returns a MERGE query object.
DatabaseConnection::popTransaction public function Decreases the depth of transaction nesting. 1
DatabaseConnection::prefixTables public function Appends a database prefix to all tables in a query.
DatabaseConnection::prepareQuery public function Prepares a query string and returns the prepared statement. 2
DatabaseConnection::pushTransaction public function Increases the depth of transaction nesting. 1
DatabaseConnection::query public function Executes a query string against the database. 1
DatabaseConnection::schema public function Returns a DatabaseSchema object for manipulating the schema.
DatabaseConnection::select public function Prepares and returns a SELECT query object.
DatabaseConnection::setKey public function Tells this connection object what its key is.
DatabaseConnection::setLogger public function Associates a logging object with this connection.
DatabaseConnection::setTarget public function Tells this connection object what its target value is.
DatabaseConnection::startTransaction public function Returns a new DatabaseTransaction object on this connection.
DatabaseConnection::supportsTransactionalDDL public function Determines if this driver supports transactional DDL.
DatabaseConnection::supportsTransactions public function Determines if this driver supports transactions.
DatabaseConnection::tablePrefix public function Find the prefix for a table.
DatabaseConnection::transactionDepth public function Determines current transaction depth.
DatabaseConnection::truncate public function Prepares and returns a TRUNCATE query object.
DatabaseConnection::update public function Prepares and returns an UPDATE query object.
DatabaseConnection::version public function Returns the version of the database server.
DatabaseConnection::__call public function Proxy possible direct calls to the \PDO methods.
DatabaseConnection_mysql::$needsCleanup protected property Flag to indicate if the cleanup function in __destruct() should run.
DatabaseConnection_mysql::$reservedKeyWords private property The list of MySQL reserved key words.
DatabaseConnection_mysql::databaseType public function Returns the name of the PDO driver for this connection. Overrides DatabaseConnection::databaseType
DatabaseConnection_mysql::doCommit protected function Do the actual commit, including a workaround for PHP 8 behaviour changes.
DatabaseConnection_mysql::driver public function Returns the type of database driver. Overrides DatabaseConnection::driver
DatabaseConnection_mysql::escapeAlias public function Escapes an alias name string. Overrides DatabaseConnection::escapeAlias
DatabaseConnection_mysql::escapeField public function Escapes a field name string. Overrides DatabaseConnection::escapeField
DatabaseConnection_mysql::escapeFields public function
DatabaseConnection_mysql::mapConditionOperator public function Gets any special processing requirements for the condition operator. Overrides DatabaseConnection::mapConditionOperator
DatabaseConnection_mysql::nextId public function Retrieves an unique id from a given sequence. Overrides DatabaseConnection::nextId
DatabaseConnection_mysql::nextIdDelete public function
DatabaseConnection_mysql::popCommittableTransactions protected function Overridden to work around issues to MySQL not supporting transactional DDL. Overrides DatabaseConnection::popCommittableTransactions
DatabaseConnection_mysql::queryRange public function Runs a limited-range query on this database object. Overrides DatabaseConnection::queryRange
DatabaseConnection_mysql::queryTemporary public function Runs a SELECT query and stores its results in a temporary table. Overrides DatabaseConnection::queryTemporary
DatabaseConnection_mysql::quoteIdentifier private function Quotes an identifier if it matches a MySQL reserved keyword.
DatabaseConnection_mysql::rollback public function Rolls back the transaction entirely or to a named savepoint. Overrides DatabaseConnection::rollback
DatabaseConnection_mysql::setPrefix protected function } Overrides DatabaseConnection::setPrefix
DatabaseConnection_mysql::utf8mb4IsActive public function Checks whether utf8mb4 support is currently active. Overrides DatabaseConnection::utf8mb4IsActive
DatabaseConnection_mysql::utf8mb4IsConfigurable public function Checks whether utf8mb4 support is configurable in settings.php. Overrides DatabaseConnection::utf8mb4IsConfigurable
DatabaseConnection_mysql::utf8mb4IsSupported public function Checks whether utf8mb4 support is available on the current database system. Overrides DatabaseConnection::utf8mb4IsSupported
DatabaseConnection_mysql::__construct public function Overrides DatabaseConnection::__construct
DatabaseConnection_mysql::__destruct public function