Compare query's parameter with IS NULL return exception on SQLCE 3.5: SQLCE, SQL CE, query, parameter, IS NULL, compact edition

Compare query's parameter with IS NULL return exception on SQLCE 3.5

I'm currently developing an mobile application with SQL Compare Edition 3.5 (SP1).

When I try the execute the following query:
SELECT TOP (1) [Field1] FROM [Table Name] WHERE ([ID] = @ID) OR ([ID] IS NULL AND @ID IS NULL)

This exception was thrown:
The specified argument value for the function is not valid. [ Argument # = 1,Name of function(if known) = isnull ]

When I took off "@ID IS NULL" from the query, it executes correctly. However, the part I took off is required.

Can anyone show me how to compare query's parameter with IS NULL? Or there is any other ways that I can work around, thanks?

p.s. this query works fine on Server edition of SQL Server

SELECT TOP (1) [Field1] FROM [Table Name] WHERE ([ID] = @ID) OR ([ID] IS NULL AND @ID IS NULL)

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Public Shared Function FieldToField(ByVal tableName As String, ByVal returnFieldName As [Enum], ByVal fieldName As [Enum], ByVal fieldValue As Object) As Object Return ExecuteScalar("SELECT TOP (1) [" & returnFieldName.ToString & "] FROM [" & tableName & "] WHERE ([" & fieldName.ToString & "] = @" & fieldName.ToString & ") OR ([" & fieldName.ToString & "] IS NULL AND @" & fieldName.ToString & " IS NULL)", New SqlCeParameter("@" & fieldName.ToString, ToFieldValue(fieldValue))) End Function

You said this was a sproc, but it's not. It's just dynamic sql. Boxing? Boxing deals with converting value types to/from reference types. Do you mean casting?

If you're having sql parsing errors then why don't you just stop trying to parse them? You are passed in a value (of type object). Why try to pass that into sql, only to have it check to see if it's null? You already know whether it is or not. I really see no reason at all to pass that value in via a param, and considering it's proven problematic, I would have jumped off that horse a while ago.

I'm not even convinced you should be using a parameter in the first place. You're already building dynamic sql, so why build it half dynamic/half parameterized? If you do eliminate the param you might just have to test the object class to see if the value needs to be quoted or not.

if fieldValue is null then
 
Return ExecuteScalar("SELECT TOP (1) [" & returnFieldName.ToString & "] FROM [" & tableName & "] WHERE " & fieldName.ToString & "] IS NULL")
 
else
 
Return ExecuteScalar("SELECT TOP (1) [" & returnFieldName.ToString & "] FROM [" & tableName & "] WHERE ([" & fieldName.ToString & "] = @" & fieldName.ToString & "), New SqlCeParameter("@" & fieldName.ToString, ToFieldValue(fieldValue)))
 
endif

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dim whereClause as string if fieldValue is null then whereClause = string.format("[{0}] is null", fieldName) else whereClause = string.format("[{0}] = {1}", fieldName, ToFieldValue(fieldValue)) endif dim sql as string sql = string.format("SELECT TOP (1) [{0}] FROM [{1}] WHERE {2}", returnFieldName, tableName, whereClause) Return ExecuteScalar(sql)

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Compare query's parameter with IS NULL return exception on SQLCE 3.5

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