internal SqlDataReader TdsExecuteTransactionManagerRequest(
byte[] buffer,
TdsEnums.TransactionManagerRequestType request,
string transactionName,
TdsEnums.TransactionManagerIsolationLevel isoLevel,
int timeout,
SqlInternalTransaction transaction,
TdsParserStateObject stateObj
)
{
Debug.Assert(this == stateObj.Parser, "different parsers");
if (TdsParserState.Broken == State || TdsParserState.Closed == State)
{
return null;
}
// Promote, Commit and Rollback requests for
// delegated transactions often happen while there is an open result
// set, so we need to handle them by using a different MARS session,
// otherwise we'll write on the physical state objects while someone
// else is using it. When we don't have MARS enabled, we need to
// lock the physical state object to syncronize it's use at least
// until we increment the open results count. Once it's been
// incremented the delegated transaction requests will fail, so they
// won't stomp on anything.
Debug.Assert(!_connHandler.ThreadHasParserLockForClose || _connHandler._parserLock.ThreadMayHaveLock(), "Thread claims to have parser lock, but lock is not taken");
bool callerHasConnectionLock = _connHandler.ThreadHasParserLockForClose; // If the thread already claims to have the parser lock, then we will let the caller handle releasing it
if (!callerHasConnectionLock)
{
_connHandler._parserLock.Wait(canReleaseFromAnyThread: false);
_connHandler.ThreadHasParserLockForClose = true;
}
// Capture _asyncWrite (after taking lock) to restore it afterwards
bool hadAsyncWrites = _asyncWrite;
try
{
// Temprarily disable async writes
_asyncWrite = false;
stateObj._outputMessageType = TdsEnums.MT_TRANS; // set message type
stateObj.SetTimeoutSeconds(timeout);
stateObj.SniContext = SniContext.Snix_Execute;
const int marsHeaderSize = 18; // 4 + 2 + 8 + 4
const int totalHeaderLength = 22; // 4 + 4 + 2 + 8 + 4
Debug.Assert(stateObj._outBytesUsed == stateObj._outputHeaderLen, "Output bytes written before total header length");
// Write total header length
WriteInt(totalHeaderLength, stateObj);
// Write mars header length
WriteInt(marsHeaderSize, stateObj);
WriteMarsHeaderData(stateObj, _currentTransaction);
WriteShort((short)request, stateObj); // write TransactionManager Request type
bool returnReader = false;
switch (request)
{
case TdsEnums.TransactionManagerRequestType.Begin:
Debug.Assert(null != transaction, "Should have specified an internalTransaction when doing a BeginTransaction request!");
// Only assign the passed in transaction if it is not equal to the current transaction.
// And, if it is not equal, the current actually should be null. Anything else
// is a unexpected state. The concern here is mainly for the mixed use of
// T-SQL and API transactions.
// Expected states:
// 1) _pendingTransaction = null, _currentTransaction = null, non null transaction
// passed in on BeginTransaction API call.
// 2) _currentTransaction != null, _pendingTransaction = null, non null transaction
// passed in but equivalent to _currentTransaction.
// #1 will occur on standard BeginTransactionAPI call. #2 should only occur if
// t-sql transaction started followed by a call to SqlConnection.BeginTransaction.
// Any other state is unknown.
if (_currentTransaction != transaction)
{
Debug.Assert(_currentTransaction == null || true == _fResetConnection, "We should not have a current Tx at this point");
PendingTransaction = transaction;
}
stateObj.WriteByte((byte)isoLevel);
stateObj.WriteByte((byte)(transactionName.Length * 2)); // Write number of bytes (unicode string).
WriteString(transactionName, stateObj);
break;
case TdsEnums.TransactionManagerRequestType.Commit:
Debug.Assert(transactionName.Length == 0, "Should not have a transaction name on Commit");
stateObj.WriteByte((byte)0); // No xact name
stateObj.WriteByte(0); // No flags
Debug.Assert(isoLevel == TdsEnums.TransactionManagerIsolationLevel.Unspecified, "Should not have isolation level other than unspecified on Commit!");
// WriteByte((byte) 0, stateObj); // IsolationLevel
// WriteByte((byte) 0, stateObj); // No begin xact name
break;
case TdsEnums.TransactionManagerRequestType.Rollback:
stateObj.WriteByte((byte)(transactionName.Length * 2)); // Write number of bytes (unicode string).
WriteString(transactionName, stateObj);
stateObj.WriteByte(0); // No flags
Debug.Assert(isoLevel == TdsEnums.TransactionManagerIsolationLevel.Unspecified, "Should not have isolation level other than unspecified on Commit!");
// WriteByte((byte) 0, stateObj); // IsolationLevel
// WriteByte((byte) 0, stateObj); // No begin xact name
break;
case TdsEnums.TransactionManagerRequestType.Save:
stateObj.WriteByte((byte)(transactionName.Length * 2)); // Write number of bytes (unicode string).
WriteString(transactionName, stateObj);
break;
default:
Debug.Assert(false, "Unexpected TransactionManagerRequest");
break;
}
Task writeTask = stateObj.WritePacket(TdsEnums.HARDFLUSH);
Debug.Assert(writeTask == null, "Writes should not pend when writing sync");
stateObj._pendingData = true;
stateObj._messageStatus = 0;
SqlDataReader dtcReader = null;
stateObj.SniContext = SniContext.Snix_Read;
if (returnReader)
{
dtcReader = new SqlDataReader(null, CommandBehavior.Default);
Debug.Assert(this == stateObj.Parser, "different parser");
#if DEBUG
// Remove the current owner of stateObj - otherwise we will hit asserts
stateObj.Owner = null;
#endif
dtcReader.Bind(stateObj);
// force consumption of metadata
_SqlMetaDataSet metaData = dtcReader.MetaData;
}
else
{
Run(RunBehavior.UntilDone, null, null, null, stateObj);
}
return dtcReader;
}
catch (Exception e)
{
if (!ADP.IsCatchableExceptionType(e))
{
throw;
}
FailureCleanup(stateObj, e);
throw;
}
finally
{
// SQLHotfix 50000518
// make sure we don't leave temporary fields set when leaving this function
_pendingTransaction = null;
_asyncWrite = hadAsyncWrites;
if (!callerHasConnectionLock)
{
_connHandler.ThreadHasParserLockForClose = false;
_connHandler._parserLock.Release();
}
}
}
private void FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, string resetOptionsString)
{
this.NotifyDependency();
if (runBehavior == RunBehavior.UntilDone)
{
try
{
this._stateObj.Parser.Run(RunBehavior.UntilDone, this, ds, null, this._stateObj);
}
catch (Exception exception2)
{
if (ADP.IsCatchableExceptionType(exception2))
{
if (this._inPrepare)
{
this._inPrepare = false;
this.IsDirty = true;
this._execType = EXECTYPE.PREPAREPENDING;
}
if (ds != null)
{
ds.Close();
}
}
throw;
}
}
if (ds != null)
{
ds.Bind(this._stateObj);
this._stateObj = null;
ds.ResetOptionsString = resetOptionsString;
this._activeConnection.AddWeakReference(ds, 1);
try
{
this._cachedMetaData = ds.MetaData;
ds.IsInitialized = true;
}
catch (Exception exception)
{
if (ADP.IsCatchableExceptionType(exception))
{
if (this._inPrepare)
{
this._inPrepare = false;
this.IsDirty = true;
this._execType = EXECTYPE.PREPAREPENDING;
}
ds.Close();
}
throw;
}
}
}
private SqlDataReader InternalPrepare(CommandBehavior behavior)
{
SqlDataReader dataStream = null;
if (this.IsDirty)
{
this.Unprepare(false);
this.IsDirty = false;
}
if (this._activeConnection.IsShiloh)
{
this._execType = EXECTYPE.PREPAREPENDING;
}
else
{
this.BuildPrepare(behavior);
this._inPrepare = true;
dataStream = new SqlDataReader(this, behavior);
try
{
this._stateObj.Parser.TdsExecuteRPC(this._rpcArrayOf1, this.CommandTimeout, false, null, this._stateObj, System.Data.CommandType.StoredProcedure == this.CommandType);
this._stateObj.Parser.Run(RunBehavior.UntilDone, this, dataStream, null, this._stateObj);
}
catch
{
this._inPrepare = false;
throw;
}
dataStream.Bind(this._stateObj);
this._execType = EXECTYPE.PREPARED;
Bid.Trace("<sc.SqlCommand.Prepare|INFO> %d#, Command prepared.\n", this.ObjectID);
}
if (this.Statistics != null)
{
this.Statistics.SafeIncrement(ref this.Statistics._prepares);
}
this._activeConnection.AddPreparedCommand(this);
return dataStream;
}
internal SqlDataReader TdsExecuteTransactionManagerRequest(byte[] buffer, TdsEnums.TransactionManagerRequestType request, string transactionName, TdsEnums.TransactionManagerIsolationLevel isoLevel, int timeout, SqlInternalTransaction transaction, TdsParserStateObject stateObj, bool isDelegateControlRequest)
{
SqlDataReader reader2;
if ((TdsParserState.Broken == this.State) || (this.State == TdsParserState.Closed))
{
return null;
}
bool lockTaken = false;
lock (this._connHandler)
{
try
{
try
{
if (this._isYukon && !this.MARSOn)
{
Monitor.Enter(this._physicalStateObj, ref lockTaken);
}
if (!isDelegateControlRequest)
{
this._connHandler.CheckEnlistedTransactionBinding();
}
stateObj._outputMessageType = 14;
stateObj.SetTimeoutSeconds(timeout);
stateObj.SniContext = SniContext.Snix_Execute;
if (this._isYukon)
{
this.WriteMarsHeader(stateObj, this._currentTransaction);
}
this.WriteShort((short) request, stateObj);
bool flag = false;
switch (request)
{
case TdsEnums.TransactionManagerRequestType.GetDTCAddress:
this.WriteShort(0, stateObj);
flag = true;
goto Label_0193;
case TdsEnums.TransactionManagerRequestType.Propagate:
if (buffer == null)
{
break;
}
this.WriteShort(buffer.Length, stateObj);
this.WriteByteArray(buffer, buffer.Length, 0, stateObj);
goto Label_0193;
case TdsEnums.TransactionManagerRequestType.Begin:
if (this._currentTransaction != transaction)
{
this.PendingTransaction = transaction;
}
this.WriteByte((byte) isoLevel, stateObj);
this.WriteByte((byte) (transactionName.Length * 2), stateObj);
this.WriteString(transactionName, stateObj);
goto Label_0193;
case TdsEnums.TransactionManagerRequestType.Commit:
this.WriteByte(0, stateObj);
this.WriteByte(0, stateObj);
goto Label_0193;
case TdsEnums.TransactionManagerRequestType.Rollback:
this.WriteByte((byte) (transactionName.Length * 2), stateObj);
this.WriteString(transactionName, stateObj);
this.WriteByte(0, stateObj);
goto Label_0193;
case TdsEnums.TransactionManagerRequestType.Save:
this.WriteByte((byte) (transactionName.Length * 2), stateObj);
this.WriteString(transactionName, stateObj);
goto Label_0193;
default:
goto Label_0193;
}
this.WriteShort(0, stateObj);
Label_0193:
stateObj.WritePacket(1);
stateObj._pendingData = true;
SqlDataReader reader = null;
stateObj.SniContext = SniContext.Snix_Read;
if (flag)
{
reader = new SqlDataReader(null, CommandBehavior.Default);
reader.Bind(stateObj);
_SqlMetaDataSet metaData = reader.MetaData;
}
else
{
this.Run(RunBehavior.UntilDone, null, null, null, stateObj);
}
if ((request == TdsEnums.TransactionManagerRequestType.Begin) || (request == TdsEnums.TransactionManagerRequestType.Propagate))
{
if ((transaction != null) && (transaction.TransactionId == this._retainedTransactionId))
{
return reader;
}
this._retainedTransactionId = 0L;
}
return reader;
}
catch (Exception exception)
{
if (!ADP.IsCatchableExceptionType(exception))
{
throw;
}
this.FailureCleanup(stateObj, exception);
throw;
}
return reader2;
}
finally
{
this._pendingTransaction = null;
if (lockTaken)
{
Monitor.Exit(this._physicalStateObj);
}
}
}
return reader2;
}
