public static void ProcessIsNullPatcherTransformations(SymbolTable symbolTable)
{
var snapshotSymbolTable = new List <IReferenceableItem>(symbolTable);
foreach (var astNamedNode in snapshotSymbolTable)
{
var nullPatcherNode = astNamedNode as AstIsNullPatcherNode;
if (nullPatcherNode != null && astNamedNode.FirstThisOrParent <ITemplate>() == null)
{
var astDerivedColumnListNode = new AstDerivedColumnListNode(nullPatcherNode.ParentItem)
{
Name = nullPatcherNode.Name,
ValidateExternalMetadata = nullPatcherNode.ValidateExternalMetadata
};
foreach (AstIsNullPatcherColumnNode patchColumn in nullPatcherNode.Columns)
{
var column = new AstDerivedColumnNode(astDerivedColumnListNode)
{
Name = patchColumn.Name,
ReplaceExisting = true,
Expression = String.Format(CultureInfo.InvariantCulture, "ISNULL({0}) ? {1} : {0}", patchColumn.Name, patchColumn.DefaultValue),
DerivedColumnType = VulcanEngine.IR.Ast.ColumnType.Object
};
astDerivedColumnListNode.Columns.Add(column);
}
Utility.Replace(nullPatcherNode, new List <AstTransformationNode> {
astDerivedColumnListNode
});
}
}
}
private void EmitReplaceExisting(AstDerivedColumnNode dc)
{
IDTSInputColumn100 col = SetInputColumnUsage(0, dc.Name, DTSUsageType.UT_READWRITE, true);
IDTSVirtualInput100 vi = Component.InputCollection[0].GetVirtualInput();
Expression expression = ExpressionHandler.ExpressionCleanerAndInputMapBuilder(dc.Expression, this, vi, DTSUsageType.UT_READONLY);
col.CustomPropertyCollection["Expression"].Value = expression.ProcessedExpression;
col.CustomPropertyCollection["FriendlyExpression"].Value = expression.FriendlyExpression;
}
private void EmitAddNewColumn(AstDerivedColumnNode column)
{
IDTSOutputColumn100 col = Component.OutputCollection[0].OutputColumnCollection.New();
col.Name = column.Name;
col.ErrorRowDisposition = DTSRowDisposition.RD_IgnoreFailure;
col.TruncationRowDisposition = DTSRowDisposition.RD_FailComponent;
// TODO: Workaround for AstDesigner bug where IsExplicitlySet isn't working
col.SetDataTypeProperties(
GetDataTypeFromString(column.DerivedColumnType),
column.IsLengthExplicitlySet || column.Length > 0 ? column.Length : 0,
column.IsPrecisionExplicitlySet || column.Precision > 0 ? column.Precision : 0,
column.IsScaleExplicitlySet || column.Scale > 0 ? column.Scale : 0,
column.IsCodepageExplicitlySet || column.Codepage > 0 ? column.Codepage : 0);
col.ExternalMetadataColumnID = 0;
col.ErrorOrTruncationOperation = "Computation";
IDTSVirtualInput100 vi = Component.InputCollection[0].GetVirtualInput();
IDTSCustomProperty100 propExpression = col.CustomPropertyCollection.New();
propExpression.Name = "Expression";
Expression exp = ExpressionHandler.ExpressionCleanerAndInputMapBuilder(column.Expression.Trim(), this, vi, DTSUsageType.UT_READONLY);
propExpression.Value = exp.ProcessedExpression;
propExpression.ContainsID = exp.ContainsId;
IDTSCustomProperty100 propFriendlyExpression = col.CustomPropertyCollection.New();
propFriendlyExpression.Name = "FriendlyExpression";
propFriendlyExpression.Value = exp.FriendlyExpression;
propFriendlyExpression.ExpressionType = DTSCustomPropertyExpressionType.CPET_NOTIFY;
propFriendlyExpression.ContainsID = exp.ContainsId;
}
