The specified cast from a materialized 'system.int32' type to the 'system.boolean' type is not valid.

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While calling the storeprocedure i got the error in storeprocedure at this line

"case when Id is null then 0 else 1 end as isparent"

this line meaning is if Id is null 0 will pass to the isparent otherwise pass 1 to isparent.

Please help me.
Thank you

What I have tried:

this line meaning is if Id is null 0 will pass to the isparent otherwise pass 1 to isparent.

Posted 27-Sep-20 20:57pm

Krishna Veni

Updated 28-Sep-20 2:53am

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OriginalGriff · Answer 1 · 2020-09-27T21:19:00

We can't tell based on that little fragment.
If I use that in an SQL statement and run it against my DB:

SQL

SELECT TOP 10 
   CASE WHEN Id IS NULL 
        THEN 0 
        ELSE 1 
   END AS IsParent 
FROM MyTable

It works fine: I get a single column containing 10 1's or 0's.

So you need to look at your SP in more detail, and work out where that code fragment is being used and what the rest of the SP / your app is doing with that result - somewhere it's expecting a boolean and getting that integer, but we have no idea where!

We can't do that for you: we don't have access to anything except exactly what you type!

Richard Deeming · Answer 2 · 2020-09-28T02:54:00

Solution 2

You are returning an int, which maps to the System.Int32 type. But you're trying to map it to a System.Boolean, so you need to return a bit instead:

SQL

CASE WHEN Id Is Null THEN CAST(0 As bit) Else CAST(1 As bit) END As IsParent

Posted 28-Sep-20 2:54am

Richard Deeming