private OleDbDataReader ExecuteReaderInternal(CommandBehavior behavior, string method)
{
OleDbDataReader dataReader = null;
OleDbException nextResultsFailure = null;
int state = ODB.InternalStateClosed;
try
{
ValidateConnectionAndTransaction(method);
if (0 != (CommandBehavior.SingleRow & behavior))
{
// CommandBehavior.SingleRow implies CommandBehavior.SingleResult
behavior |= CommandBehavior.SingleResult;
}
object executeResult;
int resultType;
switch (CommandType)
{
case 0: // uninitialized CommandType.Text
case CommandType.Text:
case CommandType.StoredProcedure:
resultType = ExecuteCommand(behavior, out executeResult);
break;
case CommandType.TableDirect:
resultType = ExecuteTableDirect(behavior, out executeResult);
break;
default:
throw ADP.InvalidCommandType(CommandType);
}
if (_executeQuery)
{
try
{
dataReader = new OleDbDataReader(_connection, this, 0, this.commandBehavior);
switch (resultType)
{
case ODB.ExecutedIMultipleResults:
dataReader.InitializeIMultipleResults(executeResult);
dataReader.NextResult();
break;
case ODB.ExecutedIRowset:
dataReader.InitializeIRowset(executeResult, ChapterHandle.DB_NULL_HCHAPTER, _recordsAffected);
dataReader.BuildMetaInfo();
dataReader.HasRowsRead();
break;
case ODB.ExecutedIRow:
dataReader.InitializeIRow(executeResult, _recordsAffected);
dataReader.BuildMetaInfo();
break;
case ODB.PrepareICommandText:
if (!_isPrepared)
{
PrepareCommandText(2);
}
OleDbDataReader.GenerateSchemaTable(dataReader, _icommandText, behavior);
break;
default:
Debug.Assert(false, "ExecuteReaderInternal: unknown result type");
break;
}
executeResult = null;
_hasDataReader = true;
_connection.AddWeakReference(dataReader, OleDbReferenceCollection.DataReaderTag);
// command stays in the executing state until the connection
// has a datareader to track for it being closed
state = ODB.InternalStateOpen;
}
finally
{
if (ODB.InternalStateOpen != state)
{
this.canceling = true;
if (null != dataReader)
{
((IDisposable)dataReader).Dispose();
dataReader = null;
}
}
}
Debug.Assert(null != dataReader, "ExecuteReader should never return a null DataReader");
}
else
{ // optimized code path for ExecuteNonQuery to not create a OleDbDataReader object
try
{
if (ODB.ExecutedIMultipleResults == resultType)
{
UnsafeNativeMethods.IMultipleResults multipleResults = (UnsafeNativeMethods.IMultipleResults)executeResult;
// may cause a Connection.ResetState which closes connection
nextResultsFailure = OleDbDataReader.NextResults(multipleResults, _connection, this, out _recordsAffected);
}
}
finally
{
try
{
if (null != executeResult)
{
Marshal.ReleaseComObject(executeResult);
executeResult = null;
}
CloseFromDataReader(ParameterBindings);
}
catch (Exception e)
{
// UNDONE - should not be catching all exceptions!!!
if (!ADP.IsCatchableExceptionType(e))
{
throw;
}
if (null != nextResultsFailure)
{
nextResultsFailure = new OleDbException(nextResultsFailure, e);
}
else
{
throw;
}
}
}
}
}
finally
{ // finally clear executing state
try
{
if ((null == dataReader) && (ODB.InternalStateOpen != state))
{
ParameterCleanup();
}
}
catch (Exception e)
{
// UNDONE - should not be catching all exceptions!!!
if (!ADP.IsCatchableExceptionType(e))
{
throw;
}
if (null != nextResultsFailure)
{
nextResultsFailure = new OleDbException(nextResultsFailure, e);
}
else
{
throw;
}
}
if (null != nextResultsFailure)
{
throw nextResultsFailure;
}
}
return(dataReader);
}
private OleDbDataReader ExecuteReaderInternal(CommandBehavior behavior, string method)
{
OleDbDataReader dataReader = null;
OleDbException previous = null;
int num2 = 0;
try
{
object obj2;
int num;
this.ValidateConnectionAndTransaction(method);
if ((CommandBehavior.SingleRow & behavior) != CommandBehavior.Default)
{
behavior |= CommandBehavior.SingleResult;
}
switch (this.CommandType)
{
case ((System.Data.CommandType) 0):
case System.Data.CommandType.Text:
case System.Data.CommandType.StoredProcedure:
num = this.ExecuteCommand(behavior, out obj2);
break;
case System.Data.CommandType.TableDirect:
num = this.ExecuteTableDirect(behavior, out obj2);
break;
default:
throw ADP.InvalidCommandType(this.CommandType);
}
if (this._executeQuery)
{
try
{
dataReader = new OleDbDataReader(this._connection, this, 0, this.commandBehavior);
switch (num)
{
case 0:
dataReader.InitializeIMultipleResults(obj2);
dataReader.NextResult();
break;
case 1:
dataReader.InitializeIRowset(obj2, ChapterHandle.DB_NULL_HCHAPTER, this._recordsAffected);
dataReader.BuildMetaInfo();
dataReader.HasRowsRead();
break;
case 2:
dataReader.InitializeIRow(obj2, this._recordsAffected);
dataReader.BuildMetaInfo();
break;
case 3:
if (!this._isPrepared)
{
this.PrepareCommandText(2);
}
OleDbDataReader.GenerateSchemaTable(dataReader, this._icommandText, behavior);
break;
}
obj2 = null;
this._hasDataReader = true;
this._connection.AddWeakReference(dataReader, 2);
num2 = 1;
return(dataReader);
}
finally
{
if (1 != num2)
{
this.canceling = true;
if (dataReader != null)
{
dataReader.Dispose();
dataReader = null;
}
}
}
}
try
{
if (num == 0)
{
UnsafeNativeMethods.IMultipleResults imultipleResults = (UnsafeNativeMethods.IMultipleResults)obj2;
previous = OleDbDataReader.NextResults(imultipleResults, this._connection, this, out this._recordsAffected);
}
}
finally
{
try
{
if (obj2 != null)
{
Marshal.ReleaseComObject(obj2);
obj2 = null;
}
this.CloseFromDataReader(this.ParameterBindings);
}
catch (Exception exception3)
{
if (!ADP.IsCatchableExceptionType(exception3))
{
throw;
}
if (previous == null)
{
throw;
}
previous = new OleDbException(previous, exception3);
}
}
}
finally
{
try
{
if ((dataReader == null) && (1 != num2))
{
this.ParameterCleanup();
}
}
catch (Exception exception2)
{
if (!ADP.IsCatchableExceptionType(exception2))
{
throw;
}
if (previous == null)
{
throw;
}
previous = new OleDbException(previous, exception2);
}
if (previous != null)
{
throw previous;
}
}
return(dataReader);
}
