Question

My code :

int key = 0;
            //get primary key of inserted row
            key = db.Query("SELECT max(event_id) FROM event where title=" + cevent.title +  "AND description=" + cevent.description + "AND event_start=" + cevent.start  + "AND event_end=" + cevent.end);

Error message :

Cannot implicitly convert type
‘System.Collections.Generic.IEnumerable’ to ‘int’

I am using C#, WebMatrix and SQL Server. WebMatrix. If I try and run ExecuteScalar instead of Query, I get

‘WebMatrix.Data.Database’ does not contain a definition for
‘ExecuteScalar’

Does anyone know what I can do to fix my code?

Answer 1

It sounds like you want Database.QueryValue instead.

// No need to declare it beforehand...
int key = (int) db.QueryValue(...);

And as in your previous question, you should absolutely not be embedding the query parameter values within the SQL.

Database.QueryValue is documented as:

Executes a SQL query that returns a single scalar value as the result.

… which sounds exactly right to me. It would be worth browsing through the docs – they’re not very detailed, but it would at least show you what’s available.