Are there any admins that can chime in on this?
I'm running into another issue where an artificial property with a converter on it is causing issues in concurrency.
A nullable datetime column is mapped to an artificial nullable datetime property with a converter that is supposed to convert nulls and dates before 1899 in the database to nulls in the application.
I think this is causing an issue where when I try to update an artificial datetime property, the optimistic concurrency verification is attempting to find the row by using 'null', when in the database it's '1899-1-1'. So the row is not found, exception is thrown.
Some code to aid in troubleshooting.
mappingConfiguration.HasArtificialPrimitiveProperty(udf.FieldName, typeof(Nullable<DateTime>)).HasFieldName(fieldName).ToColumn(udf.FieldName).WithConverter<DateTimeConverter>();publicclassDateTimeConverter : AdoTypeConverter{ publicoverrideType DefaultType { get{ returntypeof(DateTime?); } } publicoverrideobjectRead(refDataHolder holder) { //check if the value is dbnull boolisNull = holder.Reader.IsDBNull(holder.Position); //set wheather or not there is a value holder.NoValue = isNull; //if the value is null, then we need to return default values DateTime? value = null; if(!isNull) { //the value is not null, so here we want to pull the value out, and convert it value = holder.Reader.GetValue(holder.Position) asDateTime?; //if the value is nullabel, or needs to be boxed, we set the ObjectValue Property of the DataHolder if(value.RemoveTime() <= InteumDate.EMPTY_DATE) value = null; } holder.ObjectValue = value; //now we return our value returnvalue; } publicoverridevoidWrite(refDataHolder holder) { //set the db type holder.Parameter.DbType = System.Data.DbType.DateTime; //if there is no value we could specify what to set the db field to if(holder.NoValue) { holder.Parameter.Value = InteumDate.EMPTY_DATE; } else { holder.Parameter.Value = holder.ObjectValue == null? InteumDate.EMPTY_DATE : holder.ObjectValue asDateTime?; } } publicoverrideboolCreateLiteralSql(refDataHolder holder) { //If there is no value, then we just want to query against null. if(holder.NoValue) { holder.StringValue = "NULL"; //returning false indicates that no quotes are required. We want NULL instead of 'NULL' returnfalse; } else { holder.DateTimeValue = (holder.ObjectValue asDateTime?).GetValueOrDefault(InteumDate.EMPTY_DATE); // return true indicates that quotes are needed around the value returntrue; } }}Exception message:
"Row not found: GenericOID@50ac1abb TECHNOL PRIMARYKEY=4210
UPDATE [TECHNOL] SET [RUPDATEDD] = ?, [UDFG6EDDT] = ? WHERE [PRIMARYKEY] = ? AND [RUPDATEDD] = ? AND [UDFG6EDDT] is null"
The value for column UDFG6EDDT in the database is (SQL Server) '1899-1-1'. So natually, there is no row found with the given filter. How is this fixed?