From: "Jan E." <lists@...>
Date: 2012-08-11T02:02:52+09:00
Subject: Re: Help with database-related code pls

Kaye Ng wrote in post #1071965:
> Thank you Rex, but how is it an array of hashes?
>
> 'puts person.inspect' returns:
>
> {"id"=>3, "name"=>"Dave Ellefson", "job"=>"Bassist", "gender"=>"Male",
> "age"=>47, 0=>3, 1=>"Dave Ellefson", 2=>"Bassist", 3=>"Male", 4=>47}
>
> Isn't {key => value, key => value, etc. etc} just a Hash? (not an array
> of hashes)

Yes it is. And that was to be expected, because "person" is the result 
of the "first" method. So it's the first row of the table.

I guess this was a misunderstanding, and they actually wanted you to 
inspect the query result (without the "first"). However, this probably 
won't reveal anything useful. I'm pretty sure it's not an actual array 
of hashes but rather some kind of result object (which only behaves like 
an array).

Anyway, do you understand now why there's a "first"? Calling "execute" 
returns some kind of enumeration object for the rows of the query 
result. And if you want to get a specific row, you have to fetch it from 
this object. You can also call "each" on the result to loop through the 
rows:

result = $db.execute("SELECT * FROM people WHERE name = ? OR id = ?",
           idorname, idorname.to_i)
result.each do |row|
  p row
end

This should display all rows one after another.

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