Question

Adding an If/Else statement to a sql query

Asked by: BobCSD

I have a sql query (not pl/sql stored procedure, a query)... in Oracle 10g.

I want to do an if/else or case statement within the query. Is that possible from a sql statement run in asp.net by using an OracleCommand?

I have the query below.

On the MYORDER value, I want to pass in a value for if the listorder is moved higher, and this is the current questionvalue, then MYORDER is 1.
if the listorder is  moved higher and this is not the current questionvalue then MYORDER is 0.
And if it is the current questionvalue, then MYORDER is 0, and else it is 1.

Like this:
CASE
WHEN @pageMovedHigher = 1 AND
questionValueId = @questionValueId THEN 1
-- sort passed in item with lower number
WHEN @pageMovedHigher = 1 AND
questionValueId <> @questionValueId THEN 0
-- the old item will get a higher number
WHEN questionValueId = @questionValueId THEN 0
-- tie-breaker to make sure new item stays at item, and old item increments to higher number
ELSE 1
END

I want to add that to my query.
Can I do that in the sql snippet below in oracle10g, but NOT in a stored procedure?
thanks.

sql.AppendLine("UPDATE " & Me.DatabaseTableName & " qv ")
                sql.AppendLine("SET ListOrder = (select newListOrder from ")
                sql.AppendLine("(select questionValueID, row_number() over (order by ListOrder,:MYORDER) newListOrder ")
                sql.AppendLine("from(" & Me.DatabaseTableName & ") ")
                sql.AppendLine("where(QuestionSetId = :QUESTIONSETID1) ")
                sql.AppendLine(") sq ")
                sql.AppendLine("where(sq.questionValueId = qv.questionValueID) ")
                sql.AppendLine(") ")
                sql.AppendLine("where(qv.questionSetId = :QUESTIONSETID2) ")

                                  
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Asked On
2009-08-25 at 08:15:19ID24680110
Tags

Oracle 10g

,

Case / If syntax

,

ASP.NET

Topics

Oracle 10.x

,

Programming for ASP.NET

,

PL / SQL

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: BobCSDPosted on 2009-08-25 at 08:16:38ID: 25178468

associating an email addy. nevermind this one. wish you could do that by just editing your question when you forget. Or just have a default to it.

 

 

by: mwvisa1Posted on 2009-08-25 at 09:41:28ID: 25179440

BobCSD, you should be able to do that with CASE if I am understanding you correctly.

So instead of:
(order by ListOrder,:MYORDER)

you could have:
(order by ListOrder, CASE WHEN @pageMovedHigher = 1 AND questionValueId = @questionValueId THEN 1 WHEN @pageMovedHigher = 1 AND questionValueId <> @questionValueId THEN 0 WHEN questionValueId = @questionValueId THEN 0 ELSE 1 END)

As long as you properly pass in the parameters to the OracleCommand object.

Hope that helps.


--isa

 

by: BobCSDPosted on 2009-08-25 at 10:20:57ID: 25179874

I'll give that a shot and let you know. thanks!

 

by: BobCSDPosted on 2009-08-28 at 08:27:16ID: 31620207

Perfect! thanks!

20120131-EE-VQP-002

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