Question

I have a function that finds an oid from a field in a table. According to the docs, the oid field is automatically created and auto incremented. Sounds great.

def teddy_bear_id_by_url(url)
  query = "select oid from teddy_bears where url = \"#{url}\""
  res = $db.execute(query)
  return res
end

Unfortunately this code returns a [] (empty array), when running the query in the sqlite shell gives a ‘good’ value (e.g. 4).

def teddy_bear_id_by_url(url)
  return $db.execute("select oid from teddy_bears where url = '?'", url)
end

The above doesn’t work either.

I did indeed check that urlcontains what I think it does.

What might be happening?

Answer 1

There’s probably something funny going on in your url that, combined with your string interpolation, is messing up your SQL. Your best bet is to use placeholders with your execute call:

$db.execute("select oid from teddy_bears where url = ?", url)