private static void ReadMetadata(TdsPackageReader reader, ColumnMetadata col)
{
// read user type - 4 bytes Yukon, 2 backwards
reader.ReadUInt32();
// read the 2 flags and set appropriate flags in structure
col.Flag1 = reader.ReadByte();
col.Flag2 = reader.ReadByte();
var tdsType = col.TdsType = reader.ReadByte();
var tmp = col.MetaType = TdsMetaType.TdsTypes[tdsType];
col.IsPlp = tmp.IsPlp;
col.IsTextOrImage = tmp.IsTextOrImage;
var length = ReadTdsTypeLen(reader, tmp.LenBytes);
if (length == TdsEnums.SQL_USHORTVARMAXLEN && tmp.LenBytes == 2)
{
col.IsPlp = true;
}
if (tdsType == TdsEnums.SQLUDT)
{
reader.ReadUdtMetadata();
}
if (tdsType == TdsEnums.SQLXMLTYPE)
{
ReadXmlSchema(reader);
}
if (tmp.HasPrecision)
{
reader.ReadByte();
}
if (tmp.HasScale)
{
col.Scale = reader.ReadByte();
}
if (tmp.HasCollation)
{
col.Encoding = GetEncodingFromCollation(reader);
}
if (col.TdsType == TdsEnums.SQLTEXT || col.TdsType == TdsEnums.SQLNTEXT || col.TdsType == TdsEnums.SQLIMAGE)
{
ReadMultiPartTableName(reader);
}
col.Column = reader.ReadString(reader.ReadByte());
}
// read feature ID
public static void FeatureExtAck(this TdsPackageReader reader)
{
while (true)
{
var featureId = reader.ReadByte();
if (featureId == TdsEnums.FEATUREEXT_TERMINATOR)
{
break;
}
var dataLen = reader.ReadUInt32();
var data = reader.GetBytes(checked ((int)dataLen));
if (dataLen > 0)
{
OnFeatureExtAck(featureId, data);
}
}
}
public static void ParseSessionState(this TdsPackageReader reader, int length)
{
var sdata = reader.CurrentSession.CurrentSessionData;
if (length < 5)
{
throw SQL.ParsingError();
}
var seqNum = reader.ReadUInt32();
if (seqNum == uint.MaxValue)
{
reader.CurrentSession.DoNotPoolThisConnection = true;
}
var status = reader.ReadByte();
if (status > 1)
{
throw SQL.ParsingError();
}
var recoverable = status != 0;
length -= 5;
while (length > 0)
{
var stateId = reader.ReadByte();
var stateLenByte = reader.ReadByte();
var stateLen = stateLenByte < 0xFF
? stateLenByte
: reader.ReadInt32();
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)
{
var 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)
{
reader.ReadByteArray(buffer, 0, stateLen);
}
else
{
reader.GetBytes(stateLen);
}
length -= stateLenByte < 0xFF
? 2 + stateLen
: 6 + stateLen;
}
}
private static MetadataBulkCopy ReadMetadata(TdsPackageReader reader)
{
var col = new MetadataBulkCopy();
// read user type - 4 bytes Yukon, 2 backwards
reader.ReadUInt32();
// read the 2 flags and set appropriate flags in structure
col.Flag1 = reader.ReadByte();
col.Flag2 = reader.ReadByte();
var tdsType = reader.ReadByte();
col.TdsType = tdsType;
var tmp = col.MetaType = TdsMetaType.TdsTypes[tdsType];
col.IsPlp = tmp.IsPlp;
col.IsTextOrImage = tmp.IsTextOrImage;
var length = col.Length = reader.ReadTdsTypeLen(tmp.LenBytes);
if (length == TdsEnums.SQL_USHORTVARMAXLEN && tmp.LenBytes == 2)
{
col.IsPlp = true;
}
if (tdsType == TdsEnums.SQLUDT)
{
reader.ReadUdtMetadata();
}
if (tdsType == TdsEnums.SQLXMLTYPE)
{
reader.ReadXmlSchema();
}
if (tmp.HasPrecision)
{
col.Precision = reader.ReadByte();
}
if (tmp.HasScale)
{
col.Scale = reader.ReadByte();
}
if (tmp.HasCollation)
{
col.Collation = reader.ReadCollation();
col.Encoding = reader.CurrentSession.GetEncodingFromCache(col.Collation.GetCodePage());
}
if (col.IsTextOrImage)
{
col.PartTableName = reader.ReadMultiPartTableName();
}
//bulkcopy typeCorrection
if (tdsType == TdsEnums.SQLXMLTYPE)
{
col.TdsType = TdsEnums.SQLNVARCHAR;
col.Length = TdsEnums.SQL_USHORTVARMAXLEN;
col.Collation = new SqlCollations();
}
if (tdsType == TdsEnums.SQLUDT)
{
col.TdsType = TdsEnums.SQLBIGVARBINARY;
col.Length = TdsEnums.SQL_USHORTVARMAXLEN;
}
col.Column = reader.ReadString(reader.ReadByte());
return(col);
}
