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What is quicker Code or Procedure

Hello, Could somebody tell what (and why) is faster the code below or the stored procedure. I'm trying to figure out what code I should place in stored procedures and what to use C# for.

/// <summary>
/// Generates barcode from DB
/// </summary>
/// <param name="nSupplierID"></param>
/// <param name="nItemIndex">The 1 based index of item in the products table</param>
/// <returns></returns>
private string GenerateBarcode(int nSupplierID, int nItemIndex)
//First get the supplier code
string strSQL = "SELECT Supplier_Code FROM tblSuppliers WHERE Supplier_ID = " + nSupplierID.ToString();
this.m_sqlCommand.CommandText = strSQL;
string strSupplierCode = (string)m_sqlCommand.ExecuteScalar();
//Build the barcode form i.e. Month+Year+SupplierCode
string strBarcodeForm = DateTime.Now.ToString("MMyy") +  strSupplierCode;
//Find the MAX barcode of this format in the DB, eg. SELECT MAX(BarCode) FROM tblProducts WHERE BarCode LIKE '0804PAM%'
strSQL = "SELECT MAX(BarCode) FROM tblProducts WHERE BarCode LIKE '" + strBarcodeForm + "%'";
string strBarcode = "";

this.m_sqlCommand.CommandText = strSQL;
strBarcode = (string)m_sqlCommand.ExecuteScalar();
catch(InvalidCastException ex)
//If no value for the perticular barcode format exist in DB an InvalidCastException occurs
Debug.WriteLine("GenetrateBarcode() - " + ex.ToString());
strBarcode = strBarcodeForm + "00001";
return strBarcode;

//If a barode of that format exists we must increment and return it
int strBarcodeIndex = Convert.ToInt32(strBarcode.Substring(strBarcode.Length - 5, 5));
strBarcodeIndex += nItemIndex;
//2) Create Barcode
strBarcode = strBarcodeForm + strBarcodeIndex.ToString("00000");
return strBarcode;

Or the below stored procedure

ALTER PROCEDURE dbo.GenerateBarcode
      @pSupplierID int,
      @pBarcode VARCHAR(20) OUTPUT,
      @pProductIndex int
SET @BarcodeDate = GETDATE()

DECLARE @BarcodeIndex NVARCHAR(10)
--Construct Date Part
SET @BarcodeIndex = STUFF('00', 2-len(MONTH(GETDATE()))+1, 2, MONTH(GETDATE())) + right(CONVERT(nvarchar, YEAR(GETDATE())), 2)

--Add Supplier Code
SELECT @BarcodeIndex = @BarcodeIndex + (SELECT Supplier_Code FROM tblSuppliers WHERE Supplier_ID = @pSupplierID)

--Get the highest value of this type of barcode
SELECT @pBarcode = MAX(BarCode) FROM tblProducts WHERE BarCode LIKE (@BarcodeIndex + '%')

--Increment Barcode
DECLARE @nNewIndex int
--Parse last 5 chars from Barcode (e.g. 0804JOM"000020")
SET @nNewIndex = CONVERT(int, SUBSTRING( @pBarcode, LEN(@pBarcode) - 4, 5)) + @pProductIndex
SET @pBarcode = @BarcodeIndex + RIGHT('00000' + CAST(@nNewIndex AS VARCHAR(5)), 5)

3 Solutions
auk_ieAuthor Commented:
PS. both the above do pretty mush the same except stored procedure is missing an if block
they will be pretty much the same speed ... within a few ms of each other the sproc will be a little bit faster because your C# code is making 2 round trips to the database but you could do it in a single trip and they would be nearly identical.
This is a matter of situation. If they are both on the different machines then you could get an advantage with the web server, or app server being a big workhorse. Basically it depends on how the systems are setup. If you are expecting a lot of app trafic and only a couple hits to the database then put the stored proc, if your app server is rarely used but this database is heavily used then use the c# function.
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Mohammed NasmanSoftware DeveloperCommented:
Hello auk_ie

  Using Stored Procedure is faster than using sent query, also using Query with parameters is faster than passing variable with sql statmenent for example in the above query you used
.. Supplier_ID = " + nSupplierID.ToString();
if you change the sql statment as follow:
Supplier_ID = @SupID" ;

then pass the paramemter to the command

SqlParameter p = new SqlParameter("@EmpId",SqlType.VarChar,10);
p.Direction = ParameterDirection.Input;
p.Value = nSupplierID.ToString();

This way sql server will excute it faster than the one you wrote


auk_ieAuthor Commented:
Thanks, its clear that stored procedure live closer to the DB layer and will be faster, but what about the code in the strored procedure:

--Increment Barcode
DECLARE @nNewIndex int
--Parse last 5 chars from Barcode (e.g. 0804JOM"000020")
SET @nNewIndex = CONVERT(int, SUBSTRING( @pBarcode, LEN(@pBarcode) - 4, 5)) + @pProductIndex
SET @pBarcode = @BarcodeIndex + RIGHT('00000' + CAST(@nNewIndex AS VARCHAR(5)), 5)

Should I do basic formatting like this in CSharp and leave the dataaccess bit to a stored procedure. Is it correct for me to persume that stroed procedures are interpreted and slower because of it. In that case what interprets and executes the stored procedure code?
the big issue is not necesarily which is faster but which is better encapsulation ... i.e. do you have other places who need the data formatted the same way ? (lets say a report or a 3rd party who queries ?) if yes then putting it in the db is a good idea, so that you may maintain consistancy throughout the different places viewing the data.
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