internal QueryDataReader(ResultIterator resultIterator, bool schemaOnly)
{
_resultIterator = resultIterator;
_schemaOnly = schemaOnly;
_isBof = true;
if (!schemaOnly)
{
_resultIterator.Initialize();
_resultIterator.Open();
}
}
public override AlgebraNode VisitResultAlgebraNode(ResultAlgebraNode node)
{
ResultIterator resultIterator = new ResultIterator();
resultIterator.RowBuffer = new object[node.OutputList.Length];
resultIterator.Input = ConvertAlgebraNode(node.Input);
resultIterator.InputOutput = new IteratorOutput[node.OutputList.Length];
resultIterator.ColumnNames = new string[node.OutputList.Length];
resultIterator.ColumnTypes = new Type[node.OutputList.Length];
for (int i = 0; i < node.OutputList.Length; i++)
{
IteratorOutput iteratorOutput = new IteratorOutput();
iteratorOutput.SourceIndex = Array.IndexOf(node.Input.OutputList, node.OutputList[i]);
iteratorOutput.TargetIndex = i;
resultIterator.InputOutput[i] = iteratorOutput;
resultIterator.ColumnNames[i] = node.ColumnNames[i];
resultIterator.ColumnTypes[i] = node.OutputList[i].DataType;
}
SetLastIterator(node, resultIterator);
return(node);
}
public override AlgebraNode VisitResultAlgebraNode(ResultAlgebraNode node)
{
ResultIterator resultIterator = new ResultIterator();
resultIterator.RowBuffer = new object[node.OutputList.Length];
resultIterator.Input = ConvertAlgebraNode(node.Input);
resultIterator.InputOutput = new IteratorOutput[node.OutputList.Length];
resultIterator.ColumnNames = new string[node.OutputList.Length];
resultIterator.ColumnTypes = new Type[node.OutputList.Length];
for (int i = 0; i < node.OutputList.Length; i++)
{
IteratorOutput iteratorOutput = new IteratorOutput();
iteratorOutput.SourceIndex = Array.IndexOf(node.Input.OutputList, node.OutputList[i]);
iteratorOutput.TargetIndex = i;
resultIterator.InputOutput[i] = iteratorOutput;
resultIterator.ColumnNames[i] = node.ColumnNames[i];
resultIterator.ColumnTypes[i] = node.OutputList[i].DataType;
}
SetLastIterator(node, resultIterator);
return node;
}
private void Compile()
{
if (DataContext == null)
throw ExceptionBuilder.PropertyNotInitialized("DataContext");
if (Text == null || Text.Length == 0)
throw ExceptionBuilder.PropertyNotInitialized("Text");
// Compile query
ClearCompiledState();
Compiler compiler = new Compiler(_errorCollector);
_resultAlgebraNode = compiler.CompileQuery(Text, Scope);
if (_errorCollector.ErrorsSeen)
{
IList<CompilationError> errors = _errorCollector.GetErrors();
OnCompilationFailed(new CompilationFailedEventArgs(errors));
throw ExceptionBuilder.QueryCompilationFailed(errors);
}
OnCompilationSucceeded(EventArgs.Empty);
_resultIterator = IteratorCreator.Convert(DataContext.MetadataContext, true, _resultAlgebraNode);
}
protected override void ClearCompiledState()
{
_resultAlgebraNode = null;
_resultIterator = null;
_errorCollector.Reset();
}
