Probelm with query that contains parameter and reportviewer

Question

Hi,
I writing a windows application with oracle database.
I have a query like that
select * from table1 where table1.Field1 In (:param)
I create my parameter like that
Dim param as string = " 'value1', value2, 'value3' "
When i run the query it returns nothing. I think the problem is because of the double quote (") arround the param.
Does someone have an idea?
Thanks

Answer 1

This error is typical. Parameter is approapriate anyplace where you could use Oracle literal, e.g. instead of
select * from table1 where table1.Field1 In (1, 2, 3) you might use
select * from table1 where table1.Field1 In (:a1, :a2, :a3),
but SQL like
select * from table1 where table1.Field1 In ('1, 2, 3')
is most likely sensless
Generally speaking you should not use parameterized IN expression when parameters are elements of the list that is defined interactively. Better approach is to dynamically generate IN list and concatenate it to SQL string:
stSQL = 'select * from table1 where table1.Field1 In (' || v1 || ',' || 'v2' || ')'
and that's it.
Usually number of variants is limited and you do not make your Oracle server to over-parse.