Question

I’m trying to check if a specific ID exists in a table named “Products” in my sqlite database.

def existsCheck( db, id )
    temp = db.execute( "select exists(
        select 1
        from Products
        where promoID = ?
    ) ", [id] )
end

that’s my current code but that returns an array which means I have to deal with conversion before I can use it as a boolean. Any ideas how I can change it so that it returns an int with the value 1?

Answer 1

There is no need to use a subquery:

def existsCheck( db, id )
    db.execute( "select 1
                 from Products
                 where promoID = ?",
                [id] ).length > 0
end

This returns a boolean result.