/*
CONNECTION METHODS
11987
public function connect() {
		if ($this->connection instanceof \SQLite3)
			return $this->connection;
	
		try {
			$this->connection = empty($this->config['encription_key']) ? new \SQLite3($this->config['filename'], $this->config['flags']) : new \SQLite3($this->config['filename'], $this->config['flags'], $this->config['encription_key']);	
			//add regexp functions
			$this->connection->createFunction('REGEXP', [$this, 'regexp']);
			$this->connection->createFunction('IREGEXP', [$this, 'iregexp']);
		}
		catch (\Exception $e) {
			throw new SQLiteConnectionException($e->getMessage());
		}
	
		return $this->connection;
	}
1133652
function Connection(opts) {

    EventEmitter.call(this);

    opts = opts || {};

    _.defaults(opts, {
        host: 'localhost',
        port: '11211',
        reconnect: true,
        maxValueSize: 1048576
    });

    this.host = opts.host;
    this.port = opts.port;

    this.commandBuffer = new Immutable.List();

    if (opts.onConnect) {
        this.onConnect = opts.onConnect;
    }

    if (opts.onError) {
        this.onError = opts.onError;
    } else {
        this.onError = function onError(err) { this.emit('error'); console.error(err); };
    }
    this.bufferBeforeError = opts.bufferBeforeError;
    this.netTimeout = opts.netTimeout || 500;
    this.backoffLimit = opts.backoffLimit || 10000;
    this.reconnect = opts.reconnect;
    this.disconnecting = false;
    this.ready = false;
    this.backoff = opts.backoff || 10;
    this.maxValueSize = opts.maxValueSize;
    this.writeBuffer = new Immutable.List();

    this.connect();
}
318489
@Override
    public void connect(String server, int port, Map<String, Object> connectionParams, IPendingServiceCallback connectCallback) {
        connect(server, port, connectionParams, connectCallback, null);
    }
80866
function _connect($argHostname, $argUsername, $argPassword, $argDatabasename)
	{
		if (!function_exists('sybase_connect')) return null;

		// Sybase connection on custom port
		if ($this->port) {
			$argHostname .= ':' . $this->port;
		}

		if ($this->charSet) {
			$this->_connectionID = sybase_connect($argHostname,$argUsername,$argPassword, $this->charSet);
		} else {
			$this->_connectionID = sybase_connect($argHostname,$argUsername,$argPassword);
		}

		if ($this->_connectionID === false) return false;
		if ($argDatabasename) return $this->SelectDB($argDatabasename);
		return true;
	}
665372
private function connect()
    {
        $headers = [];
        if ($this->lastId) {
            $headers['Last-Event-ID'] = $this->lastId;
        }

        $this->response = $this->client->request('GET', $this->url, [
            'stream' => true,
            'headers' => $headers,
        ]);

        if ($this->response->getStatusCode() == 204) {
            throw new RuntimeException('Server forbid connection retry by responding 204 status code.');
        }
    }
10328
public function _connect()
    {
        $siteINI = eZINI::instance( 'site.ini' );

        // DB Connection setup
        // This part is not actually required since _connect will only be called
        // once, but it is useful to run the unit tests. So be it.
        // @todo refactor this using eZINI::setVariable in unit tests
        if ( self::$dbparams === null )
        {
            $fileINI = eZINI::instance( 'file.ini' );

            self::$dbparams = array();
            self::$dbparams['host']       = $fileINI->variable( 'eZDFSClusteringSettings', 'DBHost' );
            $dbPort = $fileINI->variable( 'eZDFSClusteringSettings', 'DBPort' );
            self::$dbparams['port']       = $dbPort !== '' ? $dbPort : null;
            self::$dbparams['socket']     = $fileINI->variable( 'eZDFSClusteringSettings', 'DBSocket' );
            self::$dbparams['dbname']     = $fileINI->variable( 'eZDFSClusteringSettings', 'DBName' );
            self::$dbparams['user']       = $fileINI->variable( 'eZDFSClusteringSettings', 'DBUser' );
            self::$dbparams['pass']       = $fileINI->variable( 'eZDFSClusteringSettings', 'DBPassword' );

            self::$dbparams['max_connect_tries'] = $fileINI->variable( 'eZDFSClusteringSettings', 'DBConnectRetries' );
            self::$dbparams['max_execute_tries'] = $fileINI->variable( 'eZDFSClusteringSettings', 'DBExecuteRetries' );

            self::$dbparams['sql_output'] = $siteINI->variable( "DatabaseSettings", "SQLOutput" ) == "enabled";

            self::$dbparams['cache_generation_timeout'] = $siteINI->variable( "ContentSettings", "CacheGenerationTimeout" );
        }

        $serverString = self::$dbparams['host'];
        if ( self::$dbparams['socket'] )
            $serverString .= ':' . self::$dbparams['socket'];
        elseif ( self::$dbparams['port'] )
            $serverString .= ':' . self::$dbparams['port'];

        $maxTries = self::$dbparams['max_connect_tries'];
        $tries = 0;
        eZDebug::accumulatorStart( 'mysql_cluster_connect', 'MySQL Cluster', 'Cluster database connection' );
        while ( $tries < $maxTries )
        {
            if ( $this->db = mysqli_connect( self::$dbparams['host'], self::$dbparams['user'], self::$dbparams['pass'], self::$dbparams['dbname'], self::$dbparams['port'] ) )
                break;
            ++$tries;
        }
        eZDebug::accumulatorStop( 'mysql_cluster_connect' );
        if ( !$this->db )
        {
            throw new eZClusterHandlerDBNoConnectionException(
                $serverString,
                self::$dbparams['user'],
                self::$dbparams['pass'],
                'Error ' . mysqli_connect_errno() . ': ' . mysqli_connect_error()
            );
        }

        /*if ( !mysql_select_db( self::$dbparams['dbname'], $this->db ) )
            throw new eZClusterHandlerDBNoDatabaseException( self::$dbparams['dbname'] );*/

        // DFS setup
        $this->dfsbackend = eZDFSFileHandlerBackendFactory::build();

        $charset = trim( $siteINI->variable( 'DatabaseSettings', 'Charset' ) );
        if ( $charset === '' )
        {
            $charset = eZTextCodec::internalCharset();
        }

        if ( $charset )
        {
            if ( !mysqli_set_charset( $this->db, eZMySQLCharset::mapTo( $charset ) ) )
            {
                $this->_fail( "Failed to set Database charset to $charset." );
            }
        }
    }
1082535
public function connection( $name = null )
	{
		list( $name, $type ) = $this->parseConnectionName( $name );

		// If we haven't created this connection, we'll create it based on the config
		// provided in the application. Once we've created the connections we will
		// set the "fetch mode" for PDO which determines the query return types.
		if ( !isset( $this->connections[$name] ) )
		{
			$connection = $this->makeConnection( $name );

			$this->setPdoForType( $connection, $type );

			$this->connections[$name] = $this->prepare( $connection );
		}

		return $this->connections[$name];
	}
980696
protected function connect()
    {
        // Build a database connection if we don't have one connected

        $adapter = '\\Pixie\\ConnectionAdapters\\' . ucfirst(strtolower($this->adapter));

        $adapterInstance = $this->container->build($adapter, array($this->container));

        $pdo = $adapterInstance->connect($this->adapterConfig);
        $this->setPdoInstance($pdo);

        // Preserve the first database connection with a static property
        if (!static::$storedConnection) {
            static::$storedConnection = $this;
        }
    }
473917
@Override
    public void connect(String server, int port, String application) {
        log.debug("connect server: {} port {} application {}", new Object[] { server, port, application });
        connect(server, port, application, null);
    }
5000
private function connect () {
        if ($this->isConnected()) {
            return;
        }

        parent::__construct(
            $this->data_source->getDSN(),
            $this->data_source->getUser(),
            $this->data_source->getPassword(),
            $this->data_source->getDriverOptions()
        );

        parent::setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);
        parent::setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
        parent::setAttribute(\PDO::ATTR_STATEMENT_CLASS, ['Gajus\Doll\PDOStatement', [$this]]);
        parent::setAttribute(\PDO::ATTR_DEFAULT_FETCH_MODE, \PDO::FETCH_ASSOC);

        $this->is_connected = true;

        foreach ($this->attributes as $attribute => $value) {
            $this->setAttribute($attribute, $value);
        }

        if ($this->getAttribute(\Gajus\Doll\PDO::ATTR_LOGGING)) {
            parent::exec('SET `profiling` = 1');
            parent::exec('SET `profiling_history_size` = 100');
        }
    }
1030901
public Connection getConnection() throws SQLException {
    try {
      if (urlParser == null) {
        initialize();
      }

      return MariaDbConnection.newConnection(urlParser, null);
    } catch (SQLException e) {
      throw ExceptionMapper.getException(e, null, null, false);
    }
  }
270867
Connection getConnection() throws ClassNotFoundException, SQLException{

    Class.forName(job.get(DBConfiguration.DRIVER_CLASS_PROPERTY));

    if(job.get(DBConfiguration.USERNAME_PROPERTY) == null) {
      return DriverManager.getConnection(job.get(DBConfiguration.URL_PROPERTY));
    } else {
      return DriverManager.getConnection(
          job.get(DBConfiguration.URL_PROPERTY), 
          job.get(DBConfiguration.USERNAME_PROPERTY), 
          job.get(DBConfiguration.PASSWORD_PROPERTY));
    }
  }
853411
public function _connect()
    {
        $siteINI = eZINI::instance( 'site.ini' );
        // DB Connection setup
        // This part is not actually required since _connect will only be called
        // once, but it is useful to run the unit tests. So be it.
        // @todo refactor this using eZINI::setVariable in unit tests
        if ( parent::$dbparams === null )
        {
            $fileINI = eZINI::instance( 'file.ini' );

            parent::$dbparams = array();
            parent::$dbparams['host']       = $fileINI->variable( 'eZDFSClusteringSettings', 'DBHost' );
            $dbPort = $fileINI->variable( 'eZDFSClusteringSettings', 'DBPort' );
            parent::$dbparams['port']       = $dbPort !== '' ? $dbPort : null;
            parent::$dbparams['socket']     = $fileINI->variable( 'eZDFSClusteringSettings', 'DBSocket' );
            parent::$dbparams['dbname']     = $fileINI->variable( 'eZDFSClusteringSettings', 'DBName' );
            parent::$dbparams['user']       = $fileINI->variable( 'eZDFSClusteringSettings', 'DBUser' );
            parent::$dbparams['pass']       = $fileINI->variable( 'eZDFSClusteringSettings', 'DBPassword' );

            parent::$dbparams['max_connect_tries'] = $fileINI->variable( 'eZDFSClusteringSettings', 'DBConnectRetries' );
            parent::$dbparams['max_execute_tries'] = $fileINI->variable( 'eZDFSClusteringSettings', 'DBExecuteRetries' );

            parent::$dbparams['sql_output'] = $siteINI->variable( "DatabaseSettings", "SQLOutput" ) == "enabled";

            parent::$dbparams['cache_generation_timeout'] = $siteINI->variable( "ContentSettings", "CacheGenerationTimeout" );
        }

        $serverString = parent::$dbparams['host'];
        if ( parent::$dbparams['socket'] )
            $serverString .= ':' . parent::$dbparams['socket'];
        elseif ( parent::$dbparams['port'] )
            $serverString .= ':' . parent::$dbparams['port'];

        $maxTries = parent::$dbparams['max_connect_tries'];
        $tries = 0;
        eZPerfLogger::accumulatorStart( 'mysql_cluster_connect', 'MySQL Cluster', 'Cluster database connection' );
        while ( $tries < $maxTries )
        {
            if ( $this->db = mysqli_connect( parent::$dbparams['host'], parent::$dbparams['user'], parent::$dbparams['pass'], parent::$dbparams['dbname'], parent::$dbparams['port'] ) )
                break;
            ++$tries;
        }
        eZPerfLogger::accumulatorStop( 'mysql_cluster_connect' );
        if ( !$this->db )
        {
            throw new eZClusterHandlerDBNoConnectionException(
                $serverString,
                self::$dbparams['user'],
                self::$dbparams['pass'],
                'Error ' . mysqli_connect_errno() . ': ' . mysqli_connect_error()
            );
        }

        /*if ( !mysql_select_db( parent::$dbparams['dbname'], $this->db ) )
           throw new eZClusterHandlerDBNoDatabaseException( parent::$dbparams['dbname'] );*/

        // DFS setup
        if ( $this->dfsbackend === null )
        {
            $this->dfsbackend = new eZDFSFileHandlerTracing47DFSBackend();
        }

        $charset = trim( $siteINI->variable( 'DatabaseSettings', 'Charset' ) );
        if ( $charset === '' )
        {
            $charset = eZTextCodec::internalCharset();
        }

        if ( $charset )
        {
            if ( !mysqli_set_charset( $this->db, eZMySQLCharset::mapTo( $charset ) ) )
            {
                $this->_fail( "Failed to set Database charset to $charset." );
            }
        }
    }
801496
private function connection_init()
    {
        $opts = $this->config;

        // Headers format
        $headers = [];
        foreach ($opts['headers'] as $key => $value)
            $headers[] = "$key: $value";

        $connection = new JsonRPC\Client($opts['url'], $opts['timeout'], $headers);

        $connection->ssl_verify_peer = $opts['ssl_verify_peer'];
        $connection->debug           = $opts['debug'];
        $connection->named_arguments = isset($opts['named_arguments']) && $opts['named_arguments']===true;

        if (isset($opts['username']) && $opts['username']) {
            $connection->authentication($opts['username'], $opts['password']);
        }

        return $connection;
    }
163494
function Connection(options) {
  //*****************************************************************
  // public API functions
  //*****************************************************************

  /**
   * Connect event
   *
   * @returns {Promise} promise
   */
  this.connect = () => {
    switch (_status) {
      case Status.NOT_CONNECTED:
        _status = Status.CONNECTING;
        return new Promise(function(resolve, reject) {
          _registerHandshakeCmd(resolve, reject);
        });

      case Status.CLOSING:
      case Status.CLOSED:
        return Promise.reject(
          Errors.createError(
            'Connection closed',
            true,
            info,
            '08S01',
            Errors.ER_CONNECTION_ALREADY_CLOSED
          )
        );

      case Status.CONNECTING:
      case Status.AUTHENTICATING:
        return Promise.reject(
          Errors.createError(
            'Connection is already connecting',
            true,
            info,
            '08S01',
            Errors.ER_ALREADY_CONNECTING
          )
        );
    }
    //status Connected
    return Promise.resolve(this);
  };

  /**
   * Permit to change user during connection.
   * All user variables will be reset, Prepare commands will be released.
   * !!! mysql has a bug when CONNECT_ATTRS capability is set, that is default !!!!
   *
   * @param options   connection options
   * @returns {Promise} promise
   */
  this.changeUser = options => {
    if (!info.isMariaDB()) {
      return Promise.reject(
        Errors.createError(
          'method changeUser not available for MySQL server due to Bug #83472',
          false,
          info,
          '0A000',
          Errors.ER_MYSQL_CHANGE_USER_BUG
        )
      );
    }

    return new Promise(function(resolve, reject) {
      _addCommand(
        new ChangeUser(
          options,
          resolve,
          _authFailHandler.bind(this, reject),
          _addCommand.bind(this)
        )
      );
    });
  };

  /**
   * Start transaction
   *
   * @returns {Promise} promise
   */
  this.beginTransaction = () => {
    return this.query('START TRANSACTION');
  };

  /**
   * Commit a transaction.
   *
   * @returns {Promise} command if commit was needed only
   */
  this.commit = () => {
    return _changeTransaction('COMMIT');
  };

  /**
   * Roll back a transaction.
   *
   * @returns {Promise} promise
   */
  this.rollback = () => {
    return _changeTransaction('ROLLBACK');
  };

  /**
   * Execute query using text protocol.
   *
   * @param sql     sql parameter Object can be used to supersede default option.
   *                Object must then have sql property.
   * @param values  object / array of placeholder values (not mandatory)
   * @returns {Promise} promise
   */
  this.query = (sql, values) => {
    let _cmdOpt, _sql;
    if (typeof sql === 'object') {
      _cmdOpt = sql;
      _sql = _cmdOpt.sql;
    } else {
      _sql = sql;
    }

    return new Promise(function(resolve, reject) {
      const cmd = new Query(resolve, reject, _cmdOpt, opts, _sql, values);
      if (opts.trace) Error.captureStackTrace(cmd);
      _addCommand(cmd);
    });
  };

  /**
   * Execute batch using text protocol.
   *
   * @param sql     sql parameter Object can be used to supersede default option.
   *                Object must then have sql property.
   * @param initialValues  object / array of placeholder values (not mandatory)
   * @returns {Promise} promise
   */
  this.batch = (sql, initialValues) => {
    let _options, _sql;
    if (typeof sql === 'object') {
      _options = sql;
      _sql = _options.sql;
    } else {
      _sql = sql;
    }

    return new Promise(function(resolve, reject) {
      let useBulk = canUseBulk(initialValues);

      const cmd = useBulk
        ? new BatchBulk(resolve, reject, _options, opts, _sql, initialValues)
        : new BatchRewrite(
            resolve,
            reject,
            _options,
            opts,
            _sql,
            initialValues
          );
      if (opts.trace) Error.captureStackTrace(cmd);
      _addCommand(cmd);
    });
  };

  /**
   * Execute query returning a Readable Object that will emit columns/data/end/error events
   * to permit streaming big result-set
   *
   * @param sql     sql parameter Object can be used to supersede default option.
   *                Object must then have sql property.
   * @param values  object / array of placeholder values (not mandatory)
   * @returns {Readable}
   */
  this.queryStream = (sql, values) => {
    let _cmdOpt, _sql;
    if (typeof sql === 'object') {
      _cmdOpt = sql;
      _sql = _cmdOpt.sql;
    } else {
      _sql = sql;
    }

    const cmd = new Stream(_cmdOpt, opts, _sql, values, _socket);
    if (opts.trace) Error.captureStackTrace(cmd);
    _addCommand(cmd);
    return cmd.inStream;
  };

  /**
   * Send an empty MySQL packet to ensure connection is active, and reset @@wait_timeout
   *
   * @returns {Promise} promise
   */
  this.ping = () => {
    return new Promise(function(resolve, reject) {
      return _addCommand(new Ping(resolve, reject));
    });
  };

  /**
   * Send a reset command that will
   * - rollback any open transaction
   * - reset transaction isolation level
   * - reset session variables
   * - delete user variables
   * - remove temporary tables
   * - remove all PREPARE statement
   *
   * @returns {Promise} promise
   */
  this.reset = () => {
    if (
      (info.isMariaDB() && info.hasMinVersion(10, 2, 4)) ||
      (!info.isMariaDB() && info.hasMinVersion(5, 7, 3))
    ) {
      return new Promise(function(resolve, reject) {
        return _addCommand(new Reset(resolve, reject));
      });
    }
    return Promise.reject(
      new Error(
        'Reset command not permitted for server ' + this.info.serverVersion
      )
    );
  };

  /**
   * Indicates the state of the connection as the driver knows it
   * @returns {boolean}
   */
  this.isValid = () => {
    return _status === Status.CONNECTED;
  };

  /**
   * Terminate connection gracefully.
   *
   * @returns {Promise} promise
   */
  this.end = () => {
    _addCommand = _addCommandDisabled;
    clearTimeout(_timeout);

    if (
      _status !== Status.CLOSING &&
      _status !== Status.CLOSED &&
      _status !== Status.NOT_CONNECTED
    ) {
      _status = Status.CLOSING;
      return new Promise(function(resolve, reject) {
        const ended = () => {
          _status = Status.CLOSED;
          _socket.destroy();
          _socket.unref();
          _clear();
          _receiveQueue.clear();
          resolve();
        };
        const quitCmd = new Quit(ended, ended);
        _sendQueue.push(quitCmd);
        _receiveQueue.push(quitCmd);
        if (_sendQueue.length === 1) {
          process.nextTick(_nextSendCmd.bind(this));
        }
      });
    }
    return Promise.resolve();
  };

  /**
   * Alias for destroy.
   */
  this.close = function() {
    this.destroy();
  };

  /**
   * Force connection termination by closing the underlying socket and killing server process if any.
   */
  this.destroy = () => {
    _addCommand = _addCommandDisabled;
    clearTimeout(_timeout);
    if (_status !== Status.CLOSING && _status !== Status.CLOSED) {
      _status = Status.CLOSING;
      _sendQueue.clear();
      if (_receiveQueue.length > 0) {
        //socket is closed, but server may still be processing a huge select
        //only possibility is to kill process by another thread
        //TODO reuse a pool connection to avoid connection creation
        const self = this;
        const killCon = new Connection(opts);
        killCon
          .connect()
          .then(() => {
            //*************************************************
            //kill connection
            //*************************************************
            const killResHandler = () => {
              const destroyError = Errors.createError(
                'Connection destroyed, command was killed',
                true,
                info,
                '08S01',
                Errors.ER_CMD_NOT_EXECUTED_DESTROYED
              );
              socketErrorDispatchToQueries(destroyError);
              process.nextTick(() => {
                if (_socket) _socket.destroy();
              });
              _status = Status.CLOSED;
              killCon.end().catch(() => {});
            };

            killCon
              .query('KILL ' + info.threadId)
              .then(killResHandler)
              .catch(killResHandler);
          })
          .catch(err => {
            //*************************************************
            //failing to create a kill connection, end normally
            //*************************************************
            const ended = () => {
              let sock = _socket;
              _clear();
              _status = Status.CLOSED;
              setImmediate(resolve);
              sock.destroy();
              _receiveQueue.clear();
            };
            const quitCmd = new Quit(ended, ended);
            _sendQueue.push(quitCmd);
            _receiveQueue.push(quitCmd);
            if (_sendQueue.length === 1) {
              process.nextTick(_nextSendCmd.bind(self));
            }
          });
      } else {
        _status = Status.CLOSED;
        _socket.destroy();
      }
    }
    _clear();
  };

  this.pause = () => {
    _socket.pause();
  };

  this.resume = () => {
    _socket.resume();
  };

  this.escape = value => {
    throw Errors.createError(
      '"Connection.escape intentionally not implemented. please use Connection.query(sql, values), it will be more secure and faster',
      false,
      info,
      '0A000',
      Errors.ER_NOT_IMPLEMENTED_ESCAPE
    );
  };

  this.escapeId = value => {
    throw Errors.createError(
      '"Connection.escapeId intentionally not implemented. please use Connection.query(sql, values), it will be more secure and faster',
      false,
      info,
      '0A000',
      Errors.ER_NOT_IMPLEMENTED_ESCAPEID
    );
  };

  this.format = (sql, values) => {
    throw Errors.createError(
      '"Connection.format intentionally not implemented. please use Connection.query(sql, values), it will be more secure and faster',
      false,
      info,
      '0A000',
      Errors.ER_NOT_IMPLEMENTED_FORMAT
    );
  };

  //*****************************************************************
  // additional public methods
  //*****************************************************************

  /**
   * return current connected server version information.
   *
   * @returns {*}
   */
  this.serverVersion = () => {
    if (!info.serverVersion)
      throw new Error(
        'cannot know if server information until connection is established'
      );
    return info.serverVersion.raw;
  };

  /**
   * Change option "debug" during connection.
   * @param val   debug value
   */
  this.debug = val => {
    opts.debug = val;
  };

  this.debugCompress = val => {
    opts.debugCompress = val;
  };

  //*****************************************************************
  // internal public testing methods
  //*****************************************************************

  function TestMethods() {}
  TestMethods.prototype.getCollation = () => {
    return opts.collation;
  };

  TestMethods.prototype.getSocket = () => {
    return _socket;
  };

  this.__tests = new TestMethods();

  //*****************************************************************
  // internal methods
  //*****************************************************************

  this._status = () => {
    return _status;
  };

  /**
   * Execute query using text protocol with callback emit columns/data/end/error
   * events to permit streaming big result-set
   *
   * @param sql     sql parameter Object can be used to supersede default option.
   *                Object must then have sql property.
   * @param values  object / array of placeholder values (not mandatory)
   * @param cb      callback
   * @returns {Query} query
   */
  this._queryCallback = (sql, values, cb) => {
    let _cmdOpts, _sql, _values;
    let _cb = cb;
    if (typeof sql === 'object') {
      _cmdOpts = sql;
      _sql = _cmdOpts.sql;
    } else {
      _sql = sql;
    }

    if (typeof values === 'function') {
      _cb = values;
    } else if (values !== undefined) {
      _values = values;
    }

    let cmd;
    if (_cb) {
      const resolve = rows => {
        const meta = rows.meta;
        delete rows.meta;
        _cb(null, rows, meta);
      };
      cmd = new Query(resolve, _cb, _cmdOpts, opts, _sql, _values);
    } else {
      cmd = new Query(() => {}, () => {}, _cmdOpts, opts, _sql, _values);
    }
    cmd.handleNewRows = row => {
      cmd._rows[cmd._responseIndex].push(row);
      cmd.emit('data', row);
    };

    if (opts.trace) Error.captureStackTrace(cmd);
    _addCommand(cmd);
    return cmd;
  };

  /**
   * Execute a batch using text protocol with callback emit columns/data/end/error
   * events to permit streaming big result-set
   *
   * @param sql     sql parameter Object can be used to supersede default option.
   *                Object must then have sql property.
   * @param values  object / array of placeholder values (not mandatory)
   * @param cb      callback
   * @returns {Query} query
   */
  this._batchCallback = (sql, values, cb) => {
    let _cmdOpts, _sql, _values;
    let _cb = cb;
    if (typeof sql === 'object') {
      _cmdOpts = sql;
      _sql = _cmdOpts.sql;
    } else {
      _sql = sql;
    }

    if (typeof values === 'function') {
      _cb = values;
    } else if (values !== undefined) {
      _values = values;
    }

    let cmd;

    let useBulk = canUseBulk(_values);

    const fct = useBulk ? BatchBulk : BatchRewrite;

    if (_cb) {
      const resolve = rows => {
        const meta = rows.meta;
        delete rows.meta;
        _cb(null, rows, meta);
      };
      cmd = new fct(resolve, _cb, _cmdOpts, opts, _sql, _values);
    } else {
      cmd = new fct(() => {}, () => {}, _cmdOpts, opts, _sql, _values);
    }
    cmd.handleNewRows = row => {
      cmd._rows[cmd._responseIndex].push(row);
      cmd.emit('data', row);
    };

    if (opts.trace) Error.captureStackTrace(cmd);
    _addCommand(cmd);
    return cmd;
  };

  /**
   * Use Batch rewrite or MariaDB bulk protocol.
   *
   * @param _values current batch values
   * @return {boolean} indicating if must use rewrite or bulk
   */
  const canUseBulk = _values => {
    let useBulk = info.isMariaDB() && info.hasMinVersion(10, 2, 7) && opts.bulk;
    if (useBulk) {
      //ensure that there is no stream object
      if (_values !== undefined) {
        const values = Array.isArray(_values) ? _values : [_values];
        const paramLen = Array.isArray(values[0]) ? values[0].length : 1;
        if (!opts.namedPlaceholders) {
          for (let r = 0; r < values.length; r++) {
            let row = values[r];
            if (!Array.isArray(row)) row = [row];
            if (paramLen !== row.length) {
              useBulk = false;
              break;
            }
            for (let j = 0; j < paramLen; j++) {
              const val = row[j];
              if (
                val !== null &&
                typeof val === 'object' &&
                typeof val.pipe === 'function' &&
                typeof val.read === 'function'
              ) {
                useBulk = false;
                break;
              }
            }
            if (!useBulk) break;
          }
        } else {
          for (let r = 0; r < values.length; r++) {
            let row = values[r];
            const keys = Object.keys(row);
            for (let j = 0; j < keys.length; j++) {
              const val = row[keys[j]];
              if (
                val !== null &&
                typeof val === 'object' &&
                typeof val.pipe === 'function' &&
                typeof val.read === 'function'
              ) {
                useBulk = false;
                break;
              }
            }
            if (!useBulk) break;
          }
        }
      }
    }
    return useBulk;
  };

  /**
   * Add handshake command to queue.
   *
   * @private
   */
  const _registerHandshakeCmd = (resolve, rejected) => {
    const _authFail = _authFailHandler.bind(this, rejected);
    const _authSucceed = _authSucceedHandler.bind(this, resolve, _authFail);

    const handshake = new Handshake(
      _authSucceed,
      _authFail,
      _createSecureContext.bind(this, _authFail),
      _addCommand.bind(this),
      _getSocket
    );
    Error.captureStackTrace(handshake);

    handshake.once('end', () => {
      process.nextTick(_nextSendCmd);
    });

    _receiveQueue.push(handshake);
    _initSocket(_authFail);
  };

  const _executeSessionVariableQuery = () => {
    if (opts.sessionVariables) {
      const values = [];
      let sessionQuery = 'set ';
      let keys = Object.keys(opts.sessionVariables);
      if (keys.length > 0) {
        return new Promise(function(resolve, reject) {
          for (let k = 0; k < keys.length; ++k) {
            sessionQuery +=
              (k !== 0 ? ',' : '') +
              '@@' +
              keys[k].replace(/[^a-z0-9_]/gi, '') +
              '=?';
            values.push(opts.sessionVariables[keys[k]]);
          }
          const errorHandling = initialErr => {
            reject(
              Errors.createError(
                'Error setting session variable (value ' +
                  JSON.stringify(opts.sessionVariables) +
                  '). Error: ' +
                  initialErr.message,
                true,
                info,
                '08S01',
                Errors.ER_SETTING_SESSION_ERROR,
                null
              )
            );
          };
          const cmd = new Query(
            resolve,
            errorHandling,
            null,
            opts,
            sessionQuery,
            values
          );
          if (opts.trace) Error.captureStackTrace(cmd);
          _addCommand(cmd);
        });
      }
    }
    return Promise.resolve();
  };

  /**
   * Asking server timezone if not set
   * @returns {Promise<void>|Promise<T | never>}
   * @private
   */
  const _checkServerTimezone = () => {
    if (opts.timezone === 'local' || opts.tz) {
      return Promise.resolve();
    }
    return this.query('SELECT @@system_time_zone stz, @@time_zone tz').then(
      res => {
        const serverTimezone = res[0].tz === 'SYSTEM' ? res[0].stz : res[0].tz;
        const serverZone = moment.tz.zone(serverTimezone);
        if (serverZone) {
          if (serverTimezone === moment.tz.guess()) {
            //db server and client use same timezone, avoid any conversion
            opts.tz = null;
          } else {
            opts.tz = moment.tz.setDefault(serverTimezone);
          }
        } else {
          return Promise.reject(
            Errors.createError(
              "Automatic timezone setting fails. Server timezone '" +
                serverTimezone +
                "' does't have a corresponding IANA timezone. Option timezone must be set according to server timezone",
              true,
              info,
              '08S01',
              Errors.ER_WRONG_AUTO_TIMEZONE
            )
          );
        }
        return Promise.resolve();
      }
    );
  };

  const _executeInitQuery = () => {
    if (opts.initSql) {
      const initialArr = Array.isArray(opts.initSql)
        ? opts.initSql
        : [opts.initSql];
      const initialPromises = [];
      initialArr.forEach(sql => {
        initialPromises.push(
          new Promise(function(resolve, reject) {
            const errorHandling = initialErr => {
              reject(
                Errors.createError(
                  'Error executing initial sql command: ' + initialErr.message,
                  true,
                  info,
                  '08S01',
                  Errors.ER_INITIAL_SQL_ERROR,
                  null
                )
              );
            };
            const cmd = new Query(
              resolve,
              errorHandling,
              null,
              opts,
              sql,
              null
            );
            if (opts.trace) Error.captureStackTrace(cmd);
            _addCommand(cmd);
          })
        );
      });
      return Promise.all(initialPromises);
    }
    return Promise.resolve();
  };

  const _getSocket = () => {
    return _socket;
  };

  /**
   * Initialize socket and associate events.
   * @private
   */
  const _initSocket = authFailHandler => {
    if (opts.socketPath) {
      _socket = Net.connect(opts.socketPath);
    } else {
      _socket = Net.connect(opts.port, opts.host);
    }

    if (opts.connectTimeout) {
      _timeout = setTimeout(
        _connectTimeoutReached,
        opts.connectTimeout,
        authFailHandler
      );
    }

    const _socketError = _socketErrorHandler.bind(this, authFailHandler);

    _socket.on('data', _in.onData.bind(_in));
    _socket.on('error', _socketError);
    _socket.on('end', _socketError);
    _socket.on(
      'connect',
      function() {
        clearTimeout(_timeout);
        if (_status === Status.CONNECTING) {
          _status = Status.AUTHENTICATING;
          _socketConnected = true;
          _socket.setTimeout(
            opts.socketTimeout,
            _socketTimeoutReached.bind(this, authFailHandler)
          );
          _socket.setNoDelay(true);
        }
      }.bind(this)
    );

    _socket.writeBuf = _socket.write;
    _socket.flush = () => {};
    _out.setStream(_socket);
  };

  /**
   * Authentication success result handler.
   *
   * @private
   */
  const _authSucceedHandler = (resolve, rejected) => {
    //enable packet compression according to option
    if (opts.logPackets) info.enableLogPacket();
    if (opts.compress) {
      if (info.serverCapabilities & Capabilities.COMPRESS) {
        _out.setStream(new CompressionOutputStream(_socket, opts, info));
        _in = new CompressionInputStream(_in, _receiveQueue, opts, info);
        _socket.removeAllListeners('data');
        _socket.on('data', _in.onData.bind(_in));
      } else {
        console.error(
          "connection is configured to use packet compression, but the server doesn't have this capability"
        );
      }
    }

    if (opts.pipelining) {
      _addCommand = _addCommandEnablePipeline;
      const commands = _receiveQueue.toArray();
      commands.forEach(cmd => {
        const listeners = cmd.listeners('end');
        cmd.removeListener('end', listeners[0]);
        cmd.once('send_end', () => {
          setImmediate(_nextSendCmd);
        });
      });
    }

    const errorInitialQueries = err => {
      if (!err.fatal) this.end().catch(err => {});
      process.nextTick(rejected, err);
    };

    _executeSessionVariableQuery()
      .then(() => {
        return _checkServerTimezone();
      })
      .then(() => {
        return _executeInitQuery();
      })
      .then(() => {
        _status = Status.CONNECTED;
        process.nextTick(resolve, this);
      })
      .catch(errorInitialQueries);
  };

  /**
   * Authentication failed result handler.
   *
   * @private
   */
  const _authFailHandler = (reject, err) => {
    process.nextTick(reject, err);
    //remove handshake command
    _receiveQueue.shift();

    _fatalError(err, true);
  };

  /**
   * Create TLS socket and associate events.
   *
   * @param rejected  rejected function when error
   * @param callback  callback function when done
   * @private
   */
  const _createSecureContext = (rejected, callback) => {
    const _socketError = _socketErrorHandler.bind(this, rejected);
    const sslOption = Object.assign({}, opts.ssl, {
      servername: opts.host,
      socket: _socket
    });

    try {
      const secureSocket = tls.connect(sslOption, callback);

      secureSocket.on('data', _in.onData.bind(_in));
      secureSocket.on('error', _socketError);
      secureSocket.on('end', _socketError);
      secureSocket.writeBuf = secureSocket.write;
      secureSocket.flush = () => {};

      _socket.removeAllListeners('data');
      _socket = secureSocket;

      _out.setStream(secureSocket);
    } catch (err) {
      _socketError(err);
    }
  };

  /**
   * Handle packet when no packet is expected.
   * (there can be an ERROR packet send by server/proxy to inform that connection is ending).
   *
   * @param packet  packet
   * @private
   */
  const _unexpectedPacket = function(packet) {
    if (packet && packet.peek() === 0xff) {
      //can receive unexpected error packet from server/proxy
      //to inform that connection is closed (usually by timeout)
      let err = packet.readError(info);
      if (
        err.fatal &&
        (_status !== Status.CLOSING && _status !== Status.CLOSED)
      ) {
        this.emit('error', err);
        this.end();
      }
    } else if (_status !== Status.CLOSING && _status !== Status.CLOSED) {
      this.emit(
        'error',
        Errors.createError(
          'receiving packet from server without active commands\n' +
            'conn:' +
            (info.threadId ? info.threadId : -1) +
            '(' +
            packet.pos +
            ',' +
            packet.end +
            ')\n' +
            Utils.log(opts, packet.buf, packet.pos, packet.end),
          true,
          info,
          '08S01',
          Errors.ER_UNEXPECTED_PACKET
        )
      );
      this.destroy();
    }
  };

  /**
   * Change transaction state.
   *
   * @param sql sql
   * @returns {Promise} promise
   * @private
   */
  const _changeTransaction = sql => {
    //if command in progress, driver cannot rely on status and must execute query
    if (_status === Status.CLOSING || _status === Status.CLOSED) {
      return Promise.reject(
        Errors.createError(
          'Cannot execute new commands: connection closed\nsql: ' + sql,
          true,
          info,
          '08S01',
          Errors.ER_CMD_CONNECTION_CLOSED
        )
      );
    }

    //Command in progress => must execute query
    //or if no command in progress, can rely on status to know if query is needed
    if (
      _receiveQueue.peekFront() ||
      info.status & ServerStatus.STATUS_IN_TRANS
    ) {
      return new Promise(function(resolve, reject) {
        const cmd = new Query(resolve, reject, null, opts, sql, null);
        if (opts.trace) Error.captureStackTrace(cmd);
        _addCommand(cmd);
      });
    }
    return Promise.resolve();
  };

  /**
   * Handle connection timeout.
   *
   * @private
   */
  const _connectTimeoutReached = function(authFailHandler) {
    _timeout = null;
    const handshake = _receiveQueue.peekFront();
    authFailHandler(
      Errors.createError(
        'Connection timeout',
        true,
        info,
        '08S01',
        Errors.ER_CONNECTION_TIMEOUT,
        handshake ? handshake.stack : null
      )
    );
  };

  /**
   * Handle socket timeout.
   *
   * @private
   */
  const _socketTimeoutReached = function() {
    const err = Errors.createError(
      'socket timeout',
      true,
      info,
      '08S01',
      Errors.ER_SOCKET_TIMEOUT
    );
    const packetMsgs = info.getLastPackets();
    if (packetMsgs !== '') {
      err.message = err.message + '\nlast received packets:\n' + packetMsgs;
    }
    _fatalError(err, true);
  };

  /**
   * Add command to command sending and receiving queue.
   *
   * @param cmd         command
   * @returns {*}       current command
   * @private
   */
  const _addCommandEnable = cmd => {
    cmd.once('end', () => {
      setImmediate(_nextSendCmd);
    });

    //send immediately only if no current active receiver
    if (_sendQueue.isEmpty() && _status === Status.CONNECTED) {
      if (_receiveQueue.peekFront()) {
        _receiveQueue.push(cmd);
        _sendQueue.push(cmd);
        return cmd;
      }

      _receiveQueue.push(cmd);
      cmd.start(_out, opts, info);
    } else {
      _receiveQueue.push(cmd);
      _sendQueue.push(cmd);
    }
    return cmd;
  };

  /**
   * Add command to command sending and receiving queue using pipelining
   *
   * @param cmd         command
   * @returns {*}       current command
   * @private
   */
  const _addCommandEnablePipeline = cmd => {
    cmd.once('send_end', () => {
      setImmediate(_nextSendCmd);
    });

    _receiveQueue.push(cmd);
    if (_sendQueue.isEmpty()) {
      cmd.start(_out, opts, info);
      if (cmd.sending) {
        _sendQueue.push(cmd);
        cmd.prependOnceListener('send_end', () => {
          _sendQueue.shift();
        });
      }
    } else {
      _sendQueue.push(cmd);
    }
    return cmd;
  };

  /**
   * Replacing command when connection is closing or closed to send a proper error message.
   *
   * @param cmd         command
   * @private
   */
  const _addCommandDisabled = cmd => {
    cmd.throwNewError(
      'Cannot execute new commands: connection closed\n' + cmd.displaySql(),
      true,
      info,
      '08S01',
      Errors.ER_CMD_CONNECTION_CLOSED
    );
  };

  /**
   * Handle socket error.
   *
   * @param authFailHandler   authentication handler
   * @param err               socket error
   * @private
   */
  const _socketErrorHandler = function(authFailHandler, err) {
    if (_status === Status.CLOSING || _status === Status.CLOSED) return;

    _socket.writeBuf = () => {};
    _socket.flush = () => {};

    //socket has been ended without error
    if (!err) {
      err = Errors.createError(
        'socket has unexpectedly been closed',
        true,
        info,
        '08S01',
        Errors.ER_SOCKET_UNEXPECTED_CLOSE
      );
    } else {
      err.fatal = true;
      this.sqlState = 'HY000';
    }

    const packetMsgs = info.getLastPackets();
    if (packetMsgs !== '') {
      err.message += '\nlast received packets:\n' + packetMsgs;
    }

    switch (_status) {
      case Status.CONNECTING:
      case Status.AUTHENTICATING:
        const currentCmd = _receiveQueue.peekFront();
        if (currentCmd && currentCmd.stack && err) {
          err.stack +=
            '\n From event:\n' +
            currentCmd.stack.substring(currentCmd.stack.indexOf('\n') + 1);
        }
        authFailHandler(err);
        break;

      default:
        _fatalError(err, false);
    }
  };

  /**
   * Fatal unexpected error : closing connection, and throw exception.
   *
   * @param self    current connection
   * @private
   */
  const _fatalErrorHandler = function(self) {
    return function(err, avoidThrowError) {
      if (_status === Status.CLOSING || _status === Status.CLOSED) {
        socketErrorDispatchToQueries(err);
        return;
      }
      const mustThrowError = _status !== Status.CONNECTING;
      _status = Status.CLOSING;

      //prevent executing new commands
      _addCommand = _addCommandDisabled;

      if (_socket) {
        _socket.removeAllListeners('error');
        _socket.removeAllListeners('timeout');
        _socket.removeAllListeners('close');
        _socket.removeAllListeners('data');
        if (!_socket.destroyed) _socket.destroy();
        _socket = undefined;
      }
      _status = Status.CLOSED;

      const errorThrownByCmd = socketErrorDispatchToQueries(err);
      if (mustThrowError) {
        if (self.listenerCount('error') > 0) {
          self.emit('error', err);
          self.emit('end');
          _clear();
        } else {
          self.emit('end');
          _clear();
          //error will be thrown if no error listener and no command did throw the exception
          if (!avoidThrowError && !errorThrownByCmd) throw err;
        }
      } else {
        _clear();
      }
    };
  };

  /**
   * Dispatch fatal error to current running queries.
   *
   * @param err        the fatal error
   * @return {boolean} return if error has been relayed to queries
   */
  const socketErrorDispatchToQueries = err => {
    let receiveCmd;
    let errorThrownByCmd = false;
    while ((receiveCmd = _receiveQueue.shift())) {
      if (receiveCmd && receiveCmd.onPacketReceive) {
        errorThrownByCmd = true;
        setImmediate(receiveCmd.throwError.bind(receiveCmd), err, info);
      }
    }
    return errorThrownByCmd;
  };

  /**
   * Will send next command in queue if any.
   *
   * @private
   */
  const _nextSendCmd = () => {
    let sendCmd;
    if ((sendCmd = _sendQueue.shift())) {
      if (sendCmd.sending) {
        _sendQueue.unshift(sendCmd);
      } else {
        sendCmd.start(_out, opts, info);
        if (sendCmd.sending) {
          sendCmd.prependOnceListener('send_end', () => {
            _sendQueue.shift();
          });
          _sendQueue.unshift(sendCmd);
        }
      }
    }
  };

  /**
   * Clearing connection variables when ending.
   *
   * @private
   */
  const _clear = () => {
    _sendQueue.clear();
    _out = undefined;
    _socket = undefined;
  };

  //*****************************************************************
  // internal variables
  //*****************************************************************

  EventEmitter.call(this);
  const opts = Object.assign({}, options);
  const info = new ConnectionInformation();
  const _sendQueue = new Queue();
  const _receiveQueue = new Queue();
  let _status = Status.NOT_CONNECTED;
  let _socketConnected = false;
  let _socket = null;
  let _timeout = null;
  let _addCommand = _addCommandEnable;
  const _fatalError = _fatalErrorHandler(this);
  let _out = new PacketOutputStream(opts, info);
  let _in = new PacketInputStream(
    _unexpectedPacket.bind(this),
    _receiveQueue,
    _out,
    opts,
    info
  );

  //add alias threadId for mysql/mysql2 compatibility
  Object.defineProperty(this, 'threadId', {
    get() {
      return info ? info.threadId : undefined;
    }
  });
  Object.defineProperty(this, 'info', {
    get() {
      return info;
    }
  });
}
1352340
@Deprecated
    public void connect(Object from, String from_out, Object to, String to_in) {
        controller.connect(from, from_out, to, to_in);
    }
272753
@Override
	public final Connection createConnection() throws JMSException
    {
    	String username = getStringProperty(Context.SECURITY_PRINCIPAL,null);
    	String password = getStringProperty(Context.SECURITY_CREDENTIALS,null);
    	
        return createConnection(username,password);
    }