/*!
\private
Opens a new connection to a MySQL database and returns the connection
550814
function connect( $server, $db, $user, $password, $socketPath, $charset = null, $port = false )
    {
        $connection = false;

        if ( $socketPath !== false )
        {
            ini_set( "mysqli.default_socket", $socketPath );
        }

        if ( $this->UsePersistentConnection == true )
        {
            // Only supported on PHP 5.3 (mysqlnd)
            if ( version_compare( PHP_VERSION, '5.3' ) > 0 )
                $server = 'p:' . $server;
            else
                eZDebug::writeWarning( 'mysqli only supports persistent connections when using php 5.3 and higher', __METHOD__ );
        }

        $oldHandling = eZDebug::setHandleType( eZDebug::HANDLE_EXCEPTION );
        eZDebug::accumulatorStart( 'mysqli_connection', 'mysqli_total', 'Database connection' );
        try {
            $connection = mysqli_connect( $server, $user, $password, null, (int)$port, $socketPath );
        } catch( ErrorException $e ) {}
        eZDebug::accumulatorStop( 'mysqli_connection' );
        eZDebug::setHandleType( $oldHandling );

        $maxAttempts = $this->connectRetryCount();
        $waitTime = $this->connectRetryWaitTime();
        $numAttempts = 1;
        while ( !$connection && $numAttempts <= $maxAttempts )
        {
            sleep( $waitTime );

            $oldHandling = eZDebug::setHandleType( eZDebug::HANDLE_EXCEPTION );
            eZDebug::accumulatorStart( 'mysqli_connection', 'mysqli_total', 'Database connection' );
            try {
                $connection = mysqli_connect( $server, $user, $password, null, (int)$port, $socketPath );
            } catch( ErrorException $e ) {}
            eZDebug::accumulatorStop( 'mysqli_connection' );
            eZDebug::setHandleType( $oldHandling );

            $numAttempts++;
        }
        $this->setError();

        $this->IsConnected = true;

        if ( !$connection )
        {
            eZDebug::writeError( "Connection error: Couldn't connect to database server. Please try again later or inform the system administrator.\n{$this->ErrorMessage}", __CLASS__ );
            $this->IsConnected = false;
            throw new eZDBNoConnectionException( $server, $this->ErrorMessage, $this->ErrorNumber );
        }

        if ( $this->IsConnected && $db != null )
        {
            $ret = mysqli_select_db( $connection, $db );
            if ( !$ret )
            {
                $this->setError( $connection );
                eZDebug::writeError( "Connection error: Couldn't select the database. Please try again later or inform the system administrator.\n{$this->ErrorMessage}", __CLASS__ );
                $this->IsConnected = false;
            }
        }

        if ( $charset !== null )
        {
            $originalCharset = $charset;
            $charset = eZCharsetInfo::realCharsetCode( $charset );
        }

        if ( $this->IsConnected and $charset !== null )
        {
            $status = mysqli_set_charset( $connection, eZMySQLCharset::mapTo( $charset ) );
            if ( !$status )
            {
                $this->setError();
                eZDebug::writeWarning( "Connection warning: " . mysqli_errno( $connection ) . ": " . mysqli_error( $connection ), "eZMySQLiDB" );
            }
        }

        return $connection;
    }
1198483
function handleDisconnect() {
    _connection = _mysql.createConnection(_dbConfig);

    _connection.connect(function (err) {
        if (err) {
            console.log('error when connecting to db:', err);
            setTimeout(handleDisconnect, 2000);
        }
    });

    _connection.on('error', function (err) {
        console.log('db error', err);
        if (err.code === 'PROTOCOL_CONNECTION_LOST') {
            handleDisconnect();
        } else {
            throw err;
        }
    });
}
1365870
private function getConnection()
    {
        if ($this->newConnection) {
            $this->mysqlRef = new MysqlConnection($this->host, $this->user, $this->password, $this->name, $this->key, $this->cert, $this->ca);
            $this->mysqlRef->connect();
        }else {
            $this->mysqlRef = $this->mysqlConnections->getConnection($this, $this->host, $this->user, $this->password, $this->name, $this->key, $this->cert, $this->ca);
        }
        $this->mysqliRef = $this->mysqlRef->getMysqli();
    }
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;
    }
  });
}
181728
function read($key)
	{
		$conn	= ADODB_Session::_conn();
		$data	= ADODB_Session::dataFieldName();
		$filter	= ADODB_Session::filter();
		$table	= ADODB_Session::table();

		if (!$conn) {
			return '';
		}

		//assert('$table');

		$qkey = $conn->quote($key);
		$binary = $conn->dataProvider === 'mysql' ? '/*! BINARY */' : '';

		$sql = "SELECT $data FROM $table WHERE sesskey = $binary $qkey AND expiry >= " . time();
		/* Lock code does not work as it needs to hold transaction within whole page, and we don't know if
		  developer has commited elsewhere... :(
		 */
		#if (ADODB_Session::Lock())
		#	$rs = $conn->RowLock($table, "$binary sesskey = $qkey AND expiry >= " . time(), $data);
		#else

			$rs = $conn->Execute($sql);
		//ADODB_Session::_dumprs($rs);
		if ($rs) {
			if ($rs->EOF) {
				$v = '';
			} else {
				$v = reset($rs->fields);
				$filter = array_reverse($filter);
				foreach ($filter as $f) {
					if (is_object($f)) {
						$v = $f->read($v, ADODB_Session::_sessionKey());
					}
				}
				$v = rawurldecode($v);
			}

			$rs->Close();

			ADODB_Session::_crc(strlen($v) . crc32($v));
			return $v;
		}

		return '';
	}
276271
function open()
    {
        if (is_resource($this->_db)) {
            $this->_opened = true;
            return $this->_createTable();
        } else {
            /* Set the connection function based on the 'persistent' option. */
            if (empty($this->_options['persistent'])) {
                $connectFunction = 'sqlite_open';
            } else {
                $connectFunction = 'sqlite_popen';
            }

            /* Attempt to connect to the database. */
            if ($this->_db = $connectFunction($this->_options['filename'],
                                              (int)$this->_options['mode'],
                                              $error)) {
                $this->_opened = true;
                return $this->_createTable();
            }
        }

        return $this->_opened;
    }
1348314
function _connect($argHostname, $argUsername, $argPassword, $argDatabasename)
	{
		if (!function_exists('sqlsrv_connect')) return null;
		$connectionInfo = $this->connectionInfo;
		$connectionInfo["Database"]=$argDatabasename;
		$connectionInfo["UID"]=$argUsername;
		$connectionInfo["PWD"]=$argPassword;
		
		foreach ($this->connectionParameters as $parameter=>$value)
		    $connectionInfo[$parameter] = $value;
		
		if ($this->debug) ADOConnection::outp("<hr>connecting... hostname: $argHostname params: ".var_export($connectionInfo,true));
		//if ($this->debug) ADOConnection::outp("<hr>_connectionID before: ".serialize($this->_connectionID));
		if(!($this->_connectionID = sqlsrv_connect($argHostname,$connectionInfo))) {
			if ($this->debug) ADOConnection::outp( "<hr><b>errors</b>: ".print_r( sqlsrv_errors(), true));
			return false;
		}
		//if ($this->debug) ADOConnection::outp(" _connectionID after: ".serialize($this->_connectionID));
		//if ($this->debug) ADOConnection::outp("<hr>defined functions: <pre>".var_export(get_defined_functions(),true)."</pre>");
		return true;
	}
144519
function connect(options) {
  // Default driver is MySQL.
  activeBackend = options.driver || 'mysql';

  // Save the connection options for later use.
  connectionOptions = options;

  if (activeBackend === 'mysql') {
    // Save a reference to the MySQL client object for later use.
    activeDb = mysql.createClient(options);

    if (activeDb !== null) {
      activeDb.on('error', function (err) {
        console.log(err);
      });
    }
  }

  return activeDb;
}
1325618
function connectToDB(connObject, ssl, _callback) {
        let connection;
        let sslObject;
        let connectionObject;
        if (ssl == true) {
            sslObject = {
                ca: fs.readFileSync(connObject.certificatePath),
            };
        }
        console.log('Setting connection params');
        if (connObject.dbtype === 'mysql') {
            if (ssl == true) {
                connectionObject = {
                    host: connObject.server,
                    port: connObject.port,
                    user: connObject.username,
                    password: connObject.password,
                    database: connObject.database,
                    connectTimeout: connObject.connTimeout,
                    ssl: sslObject,
                };
            } else {
                connectionObject = {
                    host: connObject.server,
                    port: connObject.port,
                    user: connObject.username,
                    password: connObject.password,
                    database: connObject.database,
                    connectTimeout: connObject.timeout,
                };
            }

            console.log('After initializing params for connection');
            // check if db connection string is provided
            if (checkTypes.assigned(connObject.connectionString)) {
                connection = mysql.createConnection(connectString);
            } else {
                connection = mysql.createConnection(connectionObject);
            }
            console.log('Calling connection connect');
            connection.connect(function(err) {
                _callback(err, connection);
                return connection;
            });
            return connection;
        } else {
            // TBD: Add implementation for handling other types of database and drivers.
            console.log('Invalid Database Type');
            return 0;
        }
    }
840317
function connect_cb(err, db) {
	if (err) {
	    next(err);
	} else {
	    if (db && db instanceof sqlite) {     // Sqlite only
		app.db = db;
		// Use the query escaping facilities of mysql
		app.db.escape = SqliteString.escape;
		app.db.escapeId = SqliteString.escapeId;
		app.db.format = SqliteString.format;
		// Wrap exec with a signature similar to mysql's
		// prepared queries
		app.db.query = function(sql, values, callback) {
		    // prepare the statement
		    if (typeof values == 'function') {
			callback = values;
		    } else {
			sql = app.db.format(sql, values);
		    }
		    // Log some info
		    console.log('SQL query:', sql);
		    // execute the statement
		    app.db.exec(sql, callback);
		};
		app.db.end = function() {};
	    } else {                              // MySql only
		app.db.format = MySqlString.format;
		// Wrap qyery with some logging some logging 
		var _query = app.db.query;
		app.db.query = function(sql, values, callback) {
		    var _sql = sql;
		    // prepare the statement (just for logging)
		    if (typeof values != 'function')
			_sql = app.db.format(sql, values);
		    // Log some info
		    console.log('SQL query:', _sql);
		    // execute the statement
		    return _query.call(this, sql, values, callback);
		};
	    }
	    next();
	}
    }
288558
function query($sql)
    {
        $res = false;

        for ($i = 0; $i < 2; $i++)
        {
            $res = mysql_query($sql, $this->conn);
            if ($res === false)
            {
                if (mysql_errno($this->conn) == 2006 or mysql_errno($this->conn) == 2013 or (mysql_errno($this->conn) == 0 and !$this->ping()))
                {
                    $r = $this->checkConnection();
                    if ($r === true)
                    {
                        continue;
                    }
                }
                \Swoole\Error::info(__CLASS__." SQL Error", $this->errorMessage($sql));
                return false;
            }
            break;
        }

        if (!$res)
        {
            Swoole\Error::info(__CLASS__." SQL Error", $this->errorMessage($sql));
            return false;
        }
        if (is_bool($res))
        {
            return $res;
        }
        return new MySQLRecord($res);
    }
1033160
public function getConnection()
    {
        if (empty($this->connection)) {

            if (empty($this->connectionConfig) || !is_array($this->connectionConfig))
                throw new DatabaseException("Connection config is empty or not an array.");

            $connCount = count($this->connectionConfig);
            for($i = 0; $i < $connCount; ++$i)
            {
                $connectionInfo = $this->connectionConfig[$i];

                if (empty($connectionInfo['port']))
                    $connectionInfo['port'] = 3306;

                $dsn = "mysql:dbname={$connectionInfo['database']};host={$connectionInfo['host']};port={$connectionInfo['port']}";
                if (!empty($connectionInfo['unix_socket']))
                    $dsn .= ';unix_socket='.$connectionInfo['unix_socket'];

                try {

                    $trx_attempt = 0;
                    while ($trx_attempt < $this->deadlockRetries) {

                        try {

                            $this->connection = new PDO($dsn, $connectionInfo['username'], $connectionInfo['password'], array(
                                PDO::ATTR_PERSISTENT => (!empty($connectionInfo['persistent'])?StringUtils::strToBool($connectionInfo['persistent']):false),
                                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                                PDO::ATTR_CASE => PDO::CASE_NATURAL,
                                PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true,
                                PDO::MYSQL_ATTR_DIRECT_QUERY => true,
                                PDO::ATTR_TIMEOUT => (!empty($connectionInfo['timeout'])?$connectionInfo['timeout']:30) ));


                            $this->connDebugString = $connectionInfo['host'].':'.$connectionInfo['database'];
                            $this->currentDBName = $connectionInfo['database'];

                            $this->Logger->debug(array(
                                'SQL'                    => 'CONNECTION - DB: '.$this->connDebugString,
                            ));

                            return $this->connection;

                        } catch (PDOException $pe) {
                            if ((strpos($pe->getMessage(), 'Too many connections') !== FALSE) && ++$trx_attempt < $this->deadlockRetries)
                            {
                                usleep( pow(2,$trx_attempt) * 100000 );
                                continue;
                            }

                            throw $pe;
                        }
                    }

                } catch(PDOException $pe)
                {

                    // if the last connection fails
                    if($i == ($connCount-1))
                        throw new SQLConnectionException($pe->getMessage());
                }
            }
        }

        return $this->connection;
    }
519129
public function connect() {
        if (!function_exists('\mysql_connect')) throw new RuntimeException('Undefined function mysql_connect(), mysql extension is not available');

        $host = $this->host; if ($this->port) $host .= ':'.$this->port;
        $user = $this->username;
        $pass = $this->password;

        // connect
        try {                                                                      // flags: CLIENT_FOUND_ROWS = 2
            $php_errormsg = '';
            $this->hConnection = mysql_connect($host, $user, $pass, $newLink=true/*, $flags=2*/);
            !$this->hConnection && trigger_error($php_errormsg, E_USER_ERROR);
        }
        catch (\Exception $ex) {
            if (!$ex instanceof IRosasurferException)
                $ex = new DatabaseException($ex->getMessage(), $ex->getCode(), $ex);
            throw $ex->addMessage('Can not connect to MySQL server on "'.$host.'"');
        }

        $this->setConnectionOptions();
        $this->selectDatabase();
        return $this;
    }
358831
function db_init() {
        if ($this->is_configured() === false) {
            throw new moodle_exception('auth_dbcantconnect', 'auth_db');
        }

        // Connect to the external database (forcing new connection).
        $authdb = ADONewConnection($this->config->type);
        if (!empty($this->config->debugauthdb)) {
            $authdb->debug = true;
            ob_start(); //Start output buffer to allow later use of the page headers.
        }
        $authdb->Connect($this->config->host, $this->config->user, $this->config->pass, $this->config->name, true);
        $authdb->SetFetchMode(ADODB_FETCH_ASSOC);
        if (!empty($this->config->setupsql)) {
            $authdb->Execute($this->config->setupsql);
        }

        return $authdb;
    }
1010545
private function openConnection($persistent=FALSE) {

		// continue only if not already connected
		if (is_a($this->handler, 'PDO')) {
			return;
		}
		
		switch (DBMS) {
			
			default:
			case 'mysql':
				$dsn = 'mysql:host=' . DB_HOST . ';dbname=' . DB_NAME;
				$options = array(
					\PDO::ATTR_PERSISTENT			=> (bool)$persistent,
					\PDO::MYSQL_ATTR_INIT_COMMAND	=> "SET NAMES utf8",
					\PDO::MYSQL_ATTR_FOUND_ROWS		=> TRUE);
				break;

			case 'mssql':
				$dsn = 'dblib:host=' . DB_HOST . ';dbname=' . DB_NAME;
				$options = [];
				break;
		
		}
		
		try {
				
			$this->handler = new \PDO($dsn, DB_USER, DB_PASS, $options);
				
			if (is_a($this->handler, 'PDO')) {
				$this->handler->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
			} else {
				throw new \PDOException('Db handler is not valid, connection failed');
			}
			
		} catch (\Exception $e) {

			exit($e->getMessage());
			
		}
		
	}
309215
function CreateConnection (gammu, opts) {

    gammu.Debug (3, "MySQL creating connection [%s]", gammu.uid);
    gammu.base = mysql.createConnection(opts);

    // register event for asynchronous server errors
    gammu.base.on('error', function(err) {
        gammu.Debug (1, "MySQL server error=[%s]", err);

        // Sever was restarted or network connection was lost let restart connection
        if(err.code === 'PROTOCOL_CONNECTION_LOST') {
            gammu.Debug.call (gammu, 4, "MySQL connection lost [%s/%d] automatic connect retry in 10s]", gammu.uid);
            setTimeout(function () {CreateConnection (gammu,opts);}, MYSQL_RECONNECT_TIMER);
        } else {
            throw err;  // server variable configures this)
        }
    });

    // force an initial connectiion at object construction time
    gammu.base.connect (function(err) {
        if (err) {
            gammu.Debug.call (gammu, 1, "MySQL connection fail [%s] automatic connect retry in 10s]", err);
            setTimeout(function () {CreateConnection (gammu,opts);}, MYSQL_RECONNECT_TIMER);

        } else {
            gammu.Debug.call (gammu, 5,"MySQL Connect Done [%s]",  gammu.uid);
        }
    });
}
841149
private function conn()
    {
        if (!isset(self::$_db_handle[$this->db_config_name])) {
            $dbdriver = 'DB_' . Config::get('dbdriver');
            include_once __DIR__ . '/' . $dbdriver . '.php';

            $dbdriver = '\\ePHP\\Model\\' . $dbdriver;
            self::$_db_handle[$this->db_config_name] = $this->db = new $dbdriver($this->db_config_name);
        } else {
            $this->db = self::$_db_handle[$this->db_config_name];
        }

        return $this->db;
    }