get table with default values if no row present from StoredProcedure - objective-c

Question

I have iPhone APP which was released today. Data for the app is coming from Database. While testing I noticed for one of the SPs which returns Dataset having 4 tables from Table to Table3. Table3 some time does not exist depending on the WHERE claus for some of the Client. Inside the app I have assumed it is present so result I am getting is in the for of dictionary of array. I am directly checking for ObjectATIndex. When table does not return condition fail and App crash.
Since App released today itself I cannot change code as of now.
Can I send some default values inside table.
Suppose my query for the table is
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: <Author,,Name>
-- ALTER date: <ALTER Date,,>
-- Description: <Description,,>
-- =============================================
ALTER PROCEDURE [dbo].[_spGetEmpList]
#strComCode as varchar(50),
#iDepID as INT,
#strType AS varchar(20)
AS
BEGIN
DECLARE #bNameOrder as bit
SET NOCOUNT ON;
SELECT #bNameOrder = dbo.svnGetSetupOption(#iDepID,
'LastNamePreceedsFirstName',
#strComCode)
IF ( #bNameOrder IS NULL )
SET #bNameOrder = 0
IF(#strType = 'Emp')
BEGIN
--0**************************************
SELECT EmpID AS ResourceID, EmpNumber
FROM Emuloyeetbl
WHERE Emuloyeetbl.IsActive = 1 AND DepID = #iDepID
ORDER BY EmpFName
--1**************************************
SELECT DepartmentName
FROM tblDepartment
WHERE IsActive = 1
--2**************************************
SELECT OptionValue AS EmpRole
FROM EmpRole
WHERE OptionName = 'EmployeeRole' AND DepID = #iDepID AND IsActive = 1
--3**************************************
Select EmployeeFirstName + ' '+EmplouyeeLastName as EmpName
from EmpTable
Where DepID = #iDepID AND EmpSalary < 10
END
END
Above query does not return any rows, but inside my app I am checking for table(I assumed table will be present), is there any way I can check if row
exist or not if not then send some empty value for EmpName, at least app will not Crach.....

Answer 1

I dont think this is a good solution overall. Seeing that you are stuck, maybe this will work for you.
Create Table #EmpTable (EmployeeFirstName Varchar(8000), EmployeeLastName Varchar(8000), EmpSalary Decimal(15,2))
Insert #EmpTable Values ('Jill', 'Jacobs', 20000)
Insert #EmpTable Values ('Joe', 'Johnson', 60000)
The query looks like this:
If Exists(Select null from #EmpTable Where EmpSalary < #Filter)
Select EmployeeFirstName + ' '+EmployeeLastName as EmpName from #EmpTable Where EmpSalary < #Filter
Else
Select '' as EmpName
-- If looking for less than 10 a blank row is returned.
Declare #Filter Decimal = 10
If Exists(Select null from #EmpTable Where EmpSalary < #Filter)
Select EmployeeFirstName + ' '+EmployeeLastName as EmpName from #EmpTable Where EmpSalary < #Filter
Else
Select '' as EmpName
-- This returns the record for Jill Jacobs
Declare #Filter Decimal = 30000
If Exists(Select null from #EmpTable Where EmpSalary < #Filter)
Select EmployeeFirstName + ' '+EmployeeLastName as EmpName from #EmpTable Where EmpSalary < #Filter
Else
Select '' as EmpName

Answer 2

i have not created any table, but as Joe C mentioned i have used If Exists.
simple way:
IF EXISTS( Select EmployeeFirstName + ' '+EmplouyeeLastName as EmpName
from EmpTable
Where DepID = #iDepID AND EmpSalary < 10)
BEGIN
Select EmployeeFirstName + ' '+EmplouyeeLastName as EmpName
from EmpTable
Where DepID = #iDepID AND EmpSalary < 10
ORDER BY EmpName
END
ELSE
BEGIN
SELECT '' AS EmpName
END
Thank you Joe C for quick help.

Answer 3

This is an alternative answer with CTE:
CREATE TABLE EmpTable( EmployeeFirstName VARCHAR( 10 ), EmplouyeeLastName VARCHAR( 10 ), EmpSalary INT )
INSERT INTO EmpTable
VALUES
( 'John', 'Smith', 9 ),
( 'Bob', 'Smith', 11 )
DECLARE #MaxSalary INT
SET #MaxSalary = 7
;WITH EmpTable2 (EmpName)
AS
(
SELECT EmployeeFirstName + ' '+EmplouyeeLastName as EmpName
FROM EmpTable
WHERE EmpSalary < #MaxSalary
)
SELECT *
FROM EmpTable2
/* Add Dummy row when no records have been returned by CTE */
UNION ALL
SELECT 'None' AS EmpName
WHERE NOT EXISTS( SELECT * FROM EmpTable2 )
The above code puts a CTE around your original query. The part following UNION ALL conditionally adds a "Dummy" row if no records have been returned by CTE.
Another way:
SELECT EmpName
FROM
( SELECT EmpName, COUNT(*) OVER() AS Cnt
FROM
( SELECT EmployeeFirstName + ' ' + EmplouyeeLastName AS EmpName
FROM EmpTable
WHERE EmpSalary < #MaxSalary
UNION ALL
SELECT 'None' AS EmpName
) AS a
) AS b
WHERE ( Cnt > 1 AND EmpName != 'None' ) OR Cnt = 1