public string AlternateServer = null; // server name to reroute the connection to
public void Read(TDSReader r)
{
Length = r.ReadUInt16();
r.TokenStart(Length);
EnvChangeType = (TDSEnvChgTokens)r.ReadByte();
if (EnvChangeType == TDSEnvChgTokens.PromoteTrans)
{
r.TokenDone(); // Length always 1 for this token type
}
switch (EnvChangeType)
{
case TDSEnvChgTokens.Database: // 1 Database name
case TDSEnvChgTokens.Language: // 2 Language
case TDSEnvChgTokens.CharSet: // 3 Character set - TDS 7.0
case TDSEnvChgTokens.PacketSize: // 4 Packet Size
case TDSEnvChgTokens.UnicodeSortLocale: // 5 Unicode data sorting locale id - TDS 7.0
case TDSEnvChgTokens.UnicodeCompareFlags: // 6 Unicode data sorting comparison flags - TDS 7.0
case TDSEnvChgTokens.MirrorPartner: // 13 Database mirroring partner
case TDSEnvChgTokens.UserInfo: // 19 User instance
{
NewValue = r.ReadUnicodeString1(); // returns "" if length argument is zero
OldValue = r.ReadUnicodeString1();
break;
}
case TDSEnvChgTokens.Collation: // 7 SQL collation - generally 5 bytes
case TDSEnvChgTokens.BeginTrans: // 8 Begin transaction - old data is always 0x00 length
case TDSEnvChgTokens.CommitTrans: // 9 Commit transaction - new data is always 0x00 length
case TDSEnvChgTokens.RollbackTrans: // 10 Rollback transaction - new data is always 0x00 length
case TDSEnvChgTokens.EnlistDTC: // 11 Enlist TDS transaction - new data is always 0x00 length
case TDSEnvChgTokens.DefectTrans: // 12 Defect transaction - old data is always 0x00 length
case TDSEnvChgTokens.TransMgrAddress: // 16 Transaction Manager Address- old data is always 0x00 length - unused token
case TDSEnvChgTokens.TransEnded: // 17 Transaction Ended - new data is always 0x00 length
case TDSEnvChgTokens.ResetCompletedAck: // 18 Reset achknowledgement - new data and old data both 0x00 length
{
NewBytes = r.ReadBytes1();
OldBytes = r.ReadBytes1();
break;
}
case TDSEnvChgTokens.PromoteTrans: // 15 Promote transaction - new data length is 4 bytes, old data is always 0x00 length
{
NewBytes = r.ReadBytes4();
r.ReadByte(); // no real old data, just a 1 byte 0-length indicator
break;
}
case TDSEnvChgTokens.Routing: // 20 Routing - old data length is always 0x0000
{
// new value
ushort RoutingDataLength = r.ReadUInt16(); // may be sent if ReadOnlyIntent is true in TDS 7.1 - 7.3; could be sent in 7.4 even if the flag is false
if (RoutingDataLength > 0)
{
Protocol = r.ReadByte();
ProtocolProperty = r.ReadUInt16();
AlternateServer = r.ReadUnicodeString2();
}
// old value
r.ReadUInt16();
break;
}
}
if (EnvChangeType != TDSEnvChgTokens.PromoteTrans)
{
r.TokenDone(); // Length for this token is always 1 even if there is more data; r.DoneToken(0 is called earlier for this token type
}
}
