如何使用ruby从存储过程中调用一个值

Question

我想从数据库存储过程中调用一个值。程序IBAccountList）是：

SELECT ac.CUAccountID, ac.AccountNumber, ac.BalanceDate, p.Description, ac.ParentAccountID, p.ProductTypeID,
CASE p.ProductTypeID WHEN 1 THEN 
    dbo._Balance(ac.DRAmount, ac.CRAmount) * -1 
ELSE 
    dbo._Balance(ac.DRAmount, ac.CRAmount) 
END AS Balance, 
CASE p.ProductTypeID WHEN 1 THEN 
    NULL 
ELSE (
    SELECT dbo._Balance(intr.DRAmount, intr.CRAmount) 
    FROM CUAccount intr
    WHERE intr.ParentAccountID = ac.CUAccountID
) 
END AS Interest  
FROM CUAccount ac
INNER JOIN CUProduct p ON ac.ProductID = p.ProductID 
WHERE CustomerID = @CustomerID AND
ac.Active = 1 AND
ac.ParentAccountID IS NULL 
ORDER BY ac.AccountNumber

我希望从此存储过程中获取ProductTypeID。我将如何在红宝石中引用它。我目前正在尝试以下方法：

def fetch_account_type(number)
  @accounttype = @db.call('IBAccountList', @id).map do |accounttype|
  {accounttype: accounttype['ProductTypeID']}
  end
end