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C# TdsParserStateObject.TrySkipBytes方法代码示例

本文整理汇总了C#中System.Data.SqlClient.TdsParserStateObject.TrySkipBytes方法的典型用法代码示例。如果您正苦于以下问题:C# TdsParserStateObject.TrySkipBytes方法的具体用法?C# TdsParserStateObject.TrySkipBytes怎么用?C# TdsParserStateObject.TrySkipBytes使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在System.Data.SqlClient.TdsParserStateObject的用法示例。


在下文中一共展示了TdsParserStateObject.TrySkipBytes方法的11个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C#代码示例。

示例1: TryReadSqlVariant

        //
        // Read in a SQLVariant
        //
        // SQLVariant looks like:
        // struct
        // {
        //      BYTE TypeTag
        //      BYTE cbPropBytes
        //      BYTE[] Properties
        //      BYTE[] DataVal
        // }
        internal bool TryReadSqlVariant(SqlBuffer value, int lenTotal, TdsParserStateObject stateObj)
        {
            // get the SQLVariant type
            byte type;
            if (!stateObj.TryReadByte(out type))
            {
                return false;
            }
            ushort lenMax = 0; // maximum lenData of value inside variant

            // read cbPropBytes
            byte cbPropsActual;
            if (!stateObj.TryReadByte(out cbPropsActual))
            {
                return false;
            }
            MetaType mt = MetaType.GetSqlDataType(type, 0 /*no user datatype*/, 0 /* no lenData, non-nullable type */);
            byte cbPropsExpected = mt.PropBytes;

            int lenConsumed = TdsEnums.SQLVARIANT_SIZE + cbPropsActual; // type, count of propBytes, and actual propBytes
            int lenData = lenTotal - lenConsumed; // length of actual data

            // read known properties and skip unknown properties
            Debug.Assert(cbPropsActual >= cbPropsExpected, "cbPropsActual is less that cbPropsExpected!");

            //
            // now read the value
            //
            switch (type)
            {
                case TdsEnums.SQLBIT:
                case TdsEnums.SQLINT1:
                case TdsEnums.SQLINT2:
                case TdsEnums.SQLINT4:
                case TdsEnums.SQLINT8:
                case TdsEnums.SQLFLT4:
                case TdsEnums.SQLFLT8:
                case TdsEnums.SQLMONEY:
                case TdsEnums.SQLMONEY4:
                case TdsEnums.SQLDATETIME:
                case TdsEnums.SQLDATETIM4:
                case TdsEnums.SQLUNIQUEID:
                    if (!TryReadSqlValueInternal(value, type, lenData, stateObj))
                    {
                        return false;
                    }
                    break;

                case TdsEnums.SQLDECIMALN:
                case TdsEnums.SQLNUMERICN:
                    {
                        Debug.Assert(cbPropsExpected == 2, "SqlVariant: invalid PropBytes for decimal/numeric type!");

                        byte precision;
                        if (!stateObj.TryReadByte(out precision))
                        {
                            return false;
                        }
                        byte scale;
                        if (!stateObj.TryReadByte(out scale))
                        {
                            return false;
                        }

                        // skip over unknown properties
                        if (cbPropsActual > cbPropsExpected)
                        {
                            if (!stateObj.TrySkipBytes(cbPropsActual - cbPropsExpected))
                            {
                                return false;
                            }
                        }

                        if (!TryReadSqlDecimal(value, TdsEnums.MAX_NUMERIC_LEN, precision, scale, stateObj))
                        {
                            return false;
                        }
                        break;
                    }

                case TdsEnums.SQLBIGBINARY:
                case TdsEnums.SQLBIGVARBINARY:
                    //Debug.Assert(TdsEnums.VARNULL == lenData, "SqlVariant: data length for Binary indicates null?");
                    Debug.Assert(cbPropsExpected == 2, "SqlVariant: invalid PropBytes for binary type!");

                    if (!stateObj.TryReadUInt16(out lenMax))
                    {
                        return false;
                    }
//.........这里部分代码省略.........
开发者ID:nnyamhon,项目名称:corefx,代码行数:101,代码来源:TdsParser.cs

示例2: TrySkipPlpValue

        internal bool TrySkipPlpValue(ulong cb, TdsParserStateObject stateObj, out ulong totalBytesSkipped)
        {
            // Read and skip cb bytes or until  ReadPlpLength returns 0.
            int bytesSkipped;
            totalBytesSkipped = 0;

            if (stateObj._longlenleft == 0)
            {
                ulong ignored;
                if (!stateObj.TryReadPlpLength(false, out ignored))
                {
                    return false;
                }
            }

            while ((totalBytesSkipped < cb) &&
                    (stateObj._longlenleft > 0))
            {
                if (stateObj._longlenleft > Int32.MaxValue)
                    bytesSkipped = Int32.MaxValue;
                else
                    bytesSkipped = (int)stateObj._longlenleft;
                bytesSkipped = ((cb - totalBytesSkipped) < (ulong)bytesSkipped) ? (int)(cb - totalBytesSkipped) : bytesSkipped;

                if (!stateObj.TrySkipBytes(bytesSkipped))
                {
                    return false;
                }
                stateObj._longlenleft -= (ulong)bytesSkipped;
                totalBytesSkipped += (ulong)bytesSkipped;

                if (stateObj._longlenleft == 0)
                {
                    ulong ignored;
                    if (!stateObj.TryReadPlpLength(false, out ignored))
                    {
                        return false;
                    }
                }
            }

            return true;
        }
开发者ID:nnyamhon,项目名称:corefx,代码行数:43,代码来源:TdsParser.cs

示例3: TryProcessColumnHeaderNoNBC

        private bool TryProcessColumnHeaderNoNBC(SqlMetaDataPriv col, TdsParserStateObject stateObj, out bool isNull, out ulong length)
        {
            if (col.metaType.IsLong && !col.metaType.IsPlp)
            {
                //
                // we don't care about TextPtrs, simply go after the data after it
                //
                byte textPtrLen;
                if (!stateObj.TryReadByte(out textPtrLen))
                {
                    isNull = false;
                    length = 0;
                    return false;
                }

                if (0 != textPtrLen)
                {
                    // read past text pointer
                    if (!stateObj.TrySkipBytes(textPtrLen))
                    {
                        isNull = false;
                        length = 0;
                        return false;
                    }

                    // read past timestamp
                    if (!stateObj.TrySkipBytes(TdsEnums.TEXT_TIME_STAMP_LEN))
                    {
                        isNull = false;
                        length = 0;
                        return false;
                    }

                    isNull = false;
                    return TryGetDataLength(col, stateObj, out length);
                }
                else
                {
                    isNull = true;
                    length = 0;
                    return true;
                }
            }
            else
            {
                // non-blob columns
                ulong longlen;
                if (!TryGetDataLength(col, stateObj, out longlen))
                {
                    isNull = false;
                    length = 0;
                    return false;
                }
                isNull = IsNull(col.metaType, longlen);
                length = (isNull ? 0 : longlen);
                return true;
            }
        }
开发者ID:nnyamhon,项目名称:corefx,代码行数:58,代码来源:TdsParser.cs

示例4: TrySkipValue

        /// <summary>
        /// This method skips bytes of a single column value from the media. It supports NBCROW and handles all types of values, including PLP and long
        /// </summary>
        internal bool TrySkipValue(SqlMetaDataPriv md, int columnOrdinal, TdsParserStateObject stateObj)
        {
            if (stateObj.IsNullCompressionBitSet(columnOrdinal))
            {
                return true;
            }

            if (md.metaType.IsPlp)
            {
                ulong ignored;
                if (!TrySkipPlpValue(UInt64.MaxValue, stateObj, out ignored))
                {
                    return false;
                }
            }
            else if (md.metaType.IsLong)
            {
                Debug.Assert(!md.metaType.IsPlp, "Plp types must be handled using SkipPlpValue");

                byte textPtrLen;
                if (!stateObj.TryReadByte(out textPtrLen))
                {
                    return false;
                }

                if (0 != textPtrLen)
                {
                    if (!stateObj.TrySkipBytes(textPtrLen + TdsEnums.TEXT_TIME_STAMP_LEN))
                    {
                        return false;
                    }

                    int length;
                    if (!TryGetTokenLength(md.tdsType, stateObj, out length))
                    {
                        return false;
                    }
                    if (!stateObj.TrySkipBytes(length))
                    {
                        return false;
                    }
                }
            }
            else
            {
                int length;
                if (!TryGetTokenLength(md.tdsType, stateObj, out length))
                {
                    return false;
                }

                // if false, no value to skip - it's null
                if (!IsNull(md.metaType, (ulong)length))
                {
                    if (!stateObj.TrySkipBytes(length))
                    {
                        return false;
                    }
                }
            }

            return true;
        }
开发者ID:nnyamhon,项目名称:corefx,代码行数:66,代码来源:TdsParser.cs

示例5: TryProcessAltMetaData

        internal bool TryProcessAltMetaData(int cColumns, TdsParserStateObject stateObj, out _SqlMetaDataSet metaData)
        {
            Debug.Assert(cColumns > 0, "should have at least 1 column in altMetaData!");

            metaData = null;

            _SqlMetaDataSet altMetaDataSet = new _SqlMetaDataSet(cColumns);
            int[] indexMap = new int[cColumns];

            if (!stateObj.TryReadUInt16(out altMetaDataSet.id))
            {
                return false;
            }

            byte byCols;
            if (!stateObj.TryReadByte(out byCols))
            {
                return false;
            }

            while (byCols > 0)
            {
                if (!stateObj.TrySkipBytes(2))
                { // ignore ColNum ...
                    return false;
                }
                byCols--;
            }

            // pass 1, read the meta data off the wire
            for (int i = 0; i < cColumns; i++)
            {
                // internal meta data class
                _SqlMetaData col = altMetaDataSet[i];

                byte op;
                if (!stateObj.TryReadByte(out op))
                {
                    return false;
                }
                ushort operand;
                if (!stateObj.TryReadUInt16(out operand))
                {
                    return false;
                }

                if (!TryCommonProcessMetaData(stateObj, col))
                {
                    return false;
                }

                indexMap[i] = i;
            }

            altMetaDataSet.indexMap = indexMap;
            altMetaDataSet.visibleColumns = cColumns;

            metaData = altMetaDataSet;
            return true;
        }
开发者ID:nnyamhon,项目名称:corefx,代码行数:60,代码来源:TdsParser.cs

示例6: TryProcessColInfo

        // augments current metadata with table and key information
        private bool TryProcessColInfo(_SqlMetaDataSet columns, SqlDataReader reader, TdsParserStateObject stateObj, out _SqlMetaDataSet metaData)
        {
            Debug.Assert(columns != null && columns.Length > 0, "no metadata available!");

            metaData = null;

            for (int i = 0; i < columns.Length; i++)
            {
                _SqlMetaData col = columns[i];

                byte ignored;
                if (!stateObj.TryReadByte(out ignored))
                { // colnum, ignore
                    return false;
                }
                if (!stateObj.TryReadByte(out ignored))
                { // tablenum, ignore
                    return false;
                }

                // interpret status
                byte status;
                if (!stateObj.TryReadByte(out status))
                {
                    return false;
                }

                col.isKey = (TdsEnums.SQLKey == (status & TdsEnums.SQLKey));
                col.isHidden = (TdsEnums.SQLHidden == (status & TdsEnums.SQLHidden));

                // read off the base table name if it is different than the select list column name
                if (TdsEnums.SQLDifferentName == (status & TdsEnums.SQLDifferentName))
                {
                    byte len;
                    if (!stateObj.TryReadByte(out len))
                    {
                        return false;
                    }
                    if (!stateObj.TrySkipBytes(len * ADP.CharSize))
                    {
                        return false;
                    }
                }


                if (TdsEnums.SQLExpression == (status & TdsEnums.SQLExpression))
                {
                    col.updatability = 0;
                }
            }

            // set the metadata so that the stream knows some metadata info has changed
            metaData = columns;
            return true;
        }
开发者ID:nnyamhon,项目名称:corefx,代码行数:56,代码来源:TdsParser.cs

示例7: TryProcessLoginAck

        private bool TryProcessLoginAck(TdsParserStateObject stateObj, out SqlLoginAck sqlLoginAck)
        {
            SqlLoginAck a = new SqlLoginAck();

            sqlLoginAck = null;

            // read past interface type and version
            if (!stateObj.TrySkipBytes(1))
            {
                return false;
            }

            byte[] b = new byte[TdsEnums.VERSION_SIZE];
            if (!stateObj.TryReadByteArray(b, 0, b.Length))
            {
                return false;
            }
            a.tdsVersion = (UInt32)((((((b[0] << 8) | b[1]) << 8) | b[2]) << 8) | b[3]); // bytes are in motorola order (high byte first)
            UInt32 majorMinor = a.tdsVersion & 0xff00ffff;
            UInt32 increment = (a.tdsVersion >> 16) & 0xff;

            // Server responds:
            // 0x07000000 -> Sphinx         // Notice server response format is different for bwd compat
            // 0x07010000 -> Shiloh RTM     // Notice server response format is different for bwd compat
            // 0x71000001 -> Shiloh SP1
            // 0x72xx0002 -> Yukon RTM
            // information provided by S. Ashwin

            switch (majorMinor)
            {
                case TdsEnums.YUKON_MAJOR << 24 | TdsEnums.YUKON_RTM_MINOR:     // Yukon
                    if (increment != TdsEnums.YUKON_INCREMENT) { throw SQL.InvalidTDSVersion(); }
                    break;
                case TdsEnums.KATMAI_MAJOR << 24 | TdsEnums.KATMAI_MINOR:
                    if (increment != TdsEnums.KATMAI_INCREMENT) { throw SQL.InvalidTDSVersion(); }
                    _isKatmai = true;
                    break;
                case TdsEnums.DENALI_MAJOR << 24 | TdsEnums.DENALI_MINOR:
                    if (increment != TdsEnums.DENALI_INCREMENT) { throw SQL.InvalidTDSVersion(); }
                    _isDenali = true;
                    break;
                default:
                    throw SQL.InvalidTDSVersion();
            }

            _isKatmai |= _isDenali;

            stateObj._outBytesUsed = stateObj._outputHeaderLen;
            byte len;
            if (!stateObj.TryReadByte(out len))
            {
                return false;
            }

            if (!stateObj.TrySkipBytes(len * ADP.CharSize))
            {
                return false;
            }
            if (!stateObj.TryReadByte(out a.majorVersion))
            {
                return false;
            }
            if (!stateObj.TryReadByte(out a.minorVersion))
            {
                return false;
            }
            byte buildNumHi, buildNumLo;
            if (!stateObj.TryReadByte(out buildNumHi))
            {
                return false;
            }
            if (!stateObj.TryReadByte(out buildNumLo))
            {
                return false;
            }

            a.buildNum = (short)((buildNumHi << 8) + buildNumLo);

            Debug.Assert(_state == TdsParserState.OpenNotLoggedIn, "ProcessLoginAck called with state not TdsParserState.OpenNotLoggedIn");
            _state = TdsParserState.OpenLoggedIn;

            {
                if (_fMARS)
                {
                    _resetConnectionEvent = new AutoResetEvent(true);
                }
            }

            // Fail if SSE UserInstance and we have not received this info.
            if (_connHandler.ConnectionOptions.UserInstance &&
                ADP.IsEmpty(_connHandler.InstanceName))
            {
                stateObj.AddError(new SqlError(0, 0, TdsEnums.FATAL_ERROR_CLASS, Server, SQLMessage.UserInstanceFailure(), "", 0));
                ThrowExceptionAndWarning(stateObj);
            }

            sqlLoginAck = a;
            return true;
        }
开发者ID:nnyamhon,项目名称:corefx,代码行数:99,代码来源:TdsParser.cs

示例8: TryProcessSessionState


//.........这里部分代码省略.........
                return false;
            }
            if (status > 1)
            {
                throw SQL.ParsingError();
            }
            bool recoverable = status != 0;
            length -= 5;
            while (length > 0)
            {
                byte stateId;
                if (!stateObj.TryReadByte(out stateId))
                {
                    return false;
                }
                int stateLen;
                byte stateLenByte;
                if (!stateObj.TryReadByte(out stateLenByte))
                {
                    return false;
                }
                if (stateLenByte < 0xFF)
                {
                    stateLen = stateLenByte;
                }
                else
                {
                    if (!stateObj.TryReadInt32(out stateLen))
                    {
                        return false;
                    }
                }
                byte[] buffer = null;
                lock (sdata._delta)
                {
                    if (sdata._delta[stateId] == null)
                    {
                        buffer = new byte[stateLen];
                        sdata._delta[stateId] = new SessionStateRecord { _version = seqNum, _dataLength = stateLen, _data = buffer, _recoverable = recoverable };
                        sdata._deltaDirty = true;
                        if (!recoverable)
                        {
                            checked { sdata._unrecoverableStatesCount++; }
                        }
                    }
                    else
                    {
                        if (sdata._delta[stateId]._version <= seqNum)
                        {
                            SessionStateRecord sv = sdata._delta[stateId];
                            sv._version = seqNum;
                            sv._dataLength = stateLen;
                            if (sv._recoverable != recoverable)
                            {
                                if (recoverable)
                                {
                                    Debug.Assert(sdata._unrecoverableStatesCount > 0, "Unrecoverable states count >0");
                                    sdata._unrecoverableStatesCount--;
                                }
                                else
                                {
                                    checked { sdata._unrecoverableStatesCount++; }
                                }
                                sv._recoverable = recoverable;
                            }
                            buffer = sv._data;
                            if (buffer.Length < stateLen)
                            {
                                buffer = new byte[stateLen];
                                sv._data = buffer;
                            }
                        }
                    }
                }
                if (buffer != null)
                {
                    if (!stateObj.TryReadByteArray(buffer, 0, stateLen))
                    {
                        return false;
                    }
                }
                else
                {
                    if (!stateObj.TrySkipBytes(stateLen))
                        return false;
                }

                if (stateLenByte < 0xFF)
                {
                    length -= 2 + stateLen;
                }
                else
                {
                    length -= 6 + stateLen;
                }
            }
            sdata.AssertUnrecoverableStateCountIsCorrect();

            return true;
        }
开发者ID:nnyamhon,项目名称:corefx,代码行数:101,代码来源:TdsParser.cs

示例9: TryProcessEnvChange


//.........这里部分代码省略.........
                        Debug.Assert(env.oldLength == 0 || env.oldLength == 8, "Improper length for old transaction id!");

                        if (env.oldLength > 0)
                        {
                            if (!stateObj.TryReadInt64(out env.oldLongValue))
                            {
                                return false;
                            }
                            Debug.Assert(env.oldLongValue != SqlInternalTransaction.NullTransactionId, "Old transaction id is null?"); // the server guarantees that zero is an invalid transaction id.
                        }
                        else
                        {
                            env.oldLongValue = SqlInternalTransaction.NullTransactionId; // the server guarantees that zero is an invalid transaction id.
                        }

                        // env.length includes 1 byte type token
                        env.length = 3 + env.newLength + env.oldLength;
                        break;

                    case TdsEnums.ENV_LOGSHIPNODE:
                        // env.newBinValue is secondary node, env.oldBinValue is witness node
                        // comes before LoginAck so we can't assert this
                        if (!TryReadTwoStringFields(env, stateObj))
                        {
                            return false;
                        }
                        break;

                    case TdsEnums.ENV_SPRESETCONNECTIONACK:
                        if (!TryReadTwoBinaryFields(env, stateObj))
                        {
                            return false;
                        }
                        break;

                    case TdsEnums.ENV_USERINSTANCE:
                        if (!TryReadTwoStringFields(env, stateObj))
                        {
                            return false;
                        }
                        break;

                    case TdsEnums.ENV_ROUTING:
                        ushort newLength;
                        if (!stateObj.TryReadUInt16(out newLength))
                        {
                            return false;
                        }
                        env.newLength = newLength;
                        byte protocol;
                        if (!stateObj.TryReadByte(out protocol))
                        {
                            return false;
                        }
                        ushort port;
                        if (!stateObj.TryReadUInt16(out port))
                        {
                            return false;
                        }
                        UInt16 serverLen;
                        if (!stateObj.TryReadUInt16(out serverLen))
                        {
                            return false;
                        }
                        string serverName;
                        if (!stateObj.TryReadString(serverLen, out serverName))
                        {
                            return false;
                        }
                        env.newRoutingInfo = new RoutingInfo(protocol, port, serverName);
                        UInt16 oldLength;
                        if (!stateObj.TryReadUInt16(out oldLength))
                        {
                            return false;
                        }
                        if (!stateObj.TrySkipBytes(oldLength))
                        {
                            return false;
                        }
                        env.length = env.newLength + oldLength + 5; // 5=2*sizeof(UInt16)+sizeof(byte) [token+newLength+oldLength]
                        break;

                    // ENVCHANGE tokens not supported by CoreCLR
                    case TdsEnums.ENV_ENLISTDTC:
                    case TdsEnums.ENV_DEFECTDTC:
                    case TdsEnums.ENV_TRANSACTIONENDED:
                    case TdsEnums.ENV_PROMOTETRANSACTION:
                    case TdsEnums.ENV_TRANSACTIONMANAGERADDRESS:
                        throw SQL.UnsupportedFeatureAndToken(_connHandler, ((TdsEnums.EnvChangeType)env.type).ToString());

                    default:
                        Debug.Assert(false, "Unknown environment change token: " + env.type);
                        break;
                }
                processedLength += env.length;
            }

            sqlEnvChange = envarray;
            return true;
        }
开发者ID:nnyamhon,项目名称:corefx,代码行数:101,代码来源:TdsParser.cs

示例10: TryRun


//.........这里部分代码省略.........
                                        stateObj.AddError(error);

                                        // Else we have a fatal error and we need to change the behavior
                                        // since we want the complete error information in the exception.
                                        // Besides - no further results will be received.
                                        runBehavior = RunBehavior.UntilDone;
                                    }
                                }
                            }
                            else if (error.Class >= TdsEnums.FATAL_ERROR_CLASS)
                            {
                                stateObj.AddError(error);
                            }
                            break;
                        }

                    case TdsEnums.SQLCOLINFO:
                        {
                            if (null != dataStream)
                            {
                                _SqlMetaDataSet metaDataSet;
                                if (!TryProcessColInfo(dataStream.MetaData, dataStream, stateObj, out metaDataSet))
                                {
                                    return false;
                                }
                                if (!dataStream.TrySetMetaData(metaDataSet, false))
                                {
                                    return false;
                                }
                                dataStream.BrowseModeInfoConsumed = true;
                            }
                            else
                            { // no dataStream
                                if (!stateObj.TrySkipBytes(tokenLength))
                                {
                                    return false;
                                }
                            }
                            break;
                        }

                    case TdsEnums.SQLDONE:
                    case TdsEnums.SQLDONEPROC:
                    case TdsEnums.SQLDONEINPROC:
                        {
                            // RunBehavior can be modified
                            if (!TryProcessDone(cmdHandler, dataStream, ref runBehavior, stateObj))
                            {
                                return false;
                            }
                            if ((token == TdsEnums.SQLDONEPROC) && (cmdHandler != null))
                            {
                                cmdHandler.OnDoneProc();
                            }

                            break;
                        }

                    case TdsEnums.SQLORDER:
                        {
                            // don't do anything with the order token so read off the pipe
                            if (!stateObj.TrySkipBytes(tokenLength))
                            {
                                return false;
                            }
                            break;
开发者ID:nnyamhon,项目名称:corefx,代码行数:67,代码来源:TdsParser.cs

示例11: TryProcessAltMetaData

        internal bool TryProcessAltMetaData(int cColumns, TdsParserStateObject stateObj, out _SqlMetaDataSet metaData) {
            Debug.Assert(cColumns > 0, "should have at least 1 column in altMetaData!");

            metaData = null;
            _SqlMetaDataSet altMetaDataSet = new _SqlMetaDataSet(cColumns, null);
            int[] indexMap = new int[cColumns];

            if (!stateObj.TryReadUInt16(out altMetaDataSet.id)) {
                return false;
            }

            byte byCols;
            if (!stateObj.TryReadByte(out byCols)) {
                return false;
            }

            while (byCols > 0) {
                if (!stateObj.TrySkipBytes(2)) { // ignore ColNum ...
                    return false;
                }
                byCols--;
            }

            // pass 1, read the meta data off the wire
            for (int i = 0; i < cColumns; i++) {
                // internal meta data class
                _SqlMetaData col = altMetaDataSet[i];

                if (!stateObj.TryReadByte(out col.op)) {
                    return false;
                }
                if (!stateObj.TryReadUInt16(out col.operand)) {
                    return false;
                }

                // TCE is not applicable to AltMetadata.
                if (!TryCommonProcessMetaData(stateObj, col, null, fColMD: false, columnEncryptionSetting: SqlCommandColumnEncryptionSetting.Disabled)) {
                    return false;
                }

                if (ADP.IsEmpty(col.column)) {
                    // create column name from op
                    switch (col.op) {
                        case TdsEnums.AOPAVG:
                            col.column = "avg";
                            break;

                        case TdsEnums.AOPCNT:
                            col.column = "cnt";
                            break;

                        case TdsEnums.AOPCNTB:
                            col.column = "cntb";
                            break;

                        case TdsEnums.AOPMAX:
                            col.column = "max";
                            break;

                        case TdsEnums.AOPMIN:
                            col.column = "min";
                            break;

                        case TdsEnums.AOPSUM:
                            col.column = "sum";
                            break;

                        case TdsEnums.AOPANY:
                            col.column = "any";
                            break;

                        case TdsEnums.AOPNOOP:
                            col.column = "noop";
                            break;

                        case TdsEnums.AOPSTDEV:
                            col.column = "stdev";
                            break;

                        case TdsEnums.AOPSTDEVP:
                            col.column = "stdevp";
                            break;

                        case TdsEnums.AOPVAR:
                            col.column = "var";
                            break;

                        case TdsEnums.AOPVARP:
                            col.column = "varp";
                            break;
                    }
                }
                indexMap[i] = i;
            }

            altMetaDataSet.indexMap = indexMap;
            altMetaDataSet.visibleColumns = cColumns;

            metaData = altMetaDataSet;
            return true;
//.........这里部分代码省略.........
开发者ID:iskiselev,项目名称:JSIL.NetFramework,代码行数:101,代码来源:TdsParser.cs


注:本文中的System.Data.SqlClient.TdsParserStateObject.TrySkipBytes方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。