Only functions and extended stored procedures can be executed from within a function

[paulnamroud]

Hi everybody,

When i try to excute a function i got the following error message:
" Only functions and extended stored procedures can be executed from within a function."

I wrote the following stored procedure wich update the sequence id :
--------------------------------------------------------------------
CREATE PROCEDURE dbo.pr_get_id_s equence
(@p_nom_sequenc e varchar(100),
@p_nom_table varchar(100),
@p_id_sequence numeric OUTPUT ) AS

-- return an error if sequence does not exist
-- so we will know if someone truncates the table
DECLARE @v_id_sequence numeric

SET @v_id_sequence = -1

UPDATE GST_SEQUENCE
SET @v_id_sequence = ID_SEQUENCE = ID_SEQUENCE + 1
WHERE NOM_SEQUENCE = @p_nom_sequence
AND NOM_TABLE = @p_nom_table

SET @p_id_sequence = @v_id_sequence
RETURN @p_id_sequence


Then, i wrote the following function which return the last value of sequence id:
-----------------------------------------------------------------
CREATE FUNCTION dbo.fu_get_id_s equence
(@p_nom_sequenc e varchar(100),
@p_nom_table varchar(100)
) returns int AS

BEGIN
DECLARE @v_id_sequence numeric

Execute dbo.pr_get_id_s equence @p_nom_sequence , @p_nom_table, @v_id_sequence


RETURN @v_id_sequence

END

And, when i try to call the function, i got the error message:
--------------------------------------------------------------
select dbo.fu_get_id_s equence ('SEQ', 'TABLE')


By the way i'm using SQL Server 2005. Also, I tried to create the function by incliding the UPDATE statement but it didn't work.

Can anyone help me ?
Thank you

Paul

[almaz]

The error messages clearly point to the source of error: you cannot call stored procedures, as well as perform updates, deletes and inserts in T-SQL functions. That's why you cannot execute your function. You'll have to create stored procedure instead of function to be able to call another stored procedure. Also, all output parameters should be explicitly marked as output when you call a stored procedure:

Execute dbo.pr_get_id_s equence @p_nom_sequence , @p_nom_table, @v_id_sequence output

[jmvspam]

This UDF will help you

Hello everybody,

I recently had a similar issue. In fact the error message is not properly formatted since sp_executesql is an extended stored procedure as you can check by the following script:
select objectproperty( object_id('sp_e xecutesql'),'Is ExtendedProc')
returns
1
Since we can’t use sp_executesql even it’s a XP, I had to found another workaround by using sp_OAMethod: My scenario was: how to find dynamically the number of rows in a table according some criteria (null values in my scenario). Using sp_OAMethod I built the following function:

--------------------------------
IF object_id(N'dbo .fc_ContaRegist ros_x_Criterio' ) is not null DROP FUNCTION [dbo].[fc_ContaRegistr os_x_Criterio]
GO
SET QUOTED_IDENTIFI ER ON
GO
SET ANSI_NULLS ON
GO
CREATE FUNCTION dbo.fc_ContaReg istros_x_Criter io (
@str_TBName VARCHAR(100),
@str_Criter VARCHAR(500))
RETURNS BIGINT
AS
BEGIN
-- Objetivo : Contar numero de registros de uma determinada tabela de acordo com o critério passado
-- Criação : Josué Monteiro Viana - 09/07/09
/*
Exemplo:
DECLARE @count INT
SET @count = dbo.fc_ContaReg istros_x_Criter io('master.dbo. sysobjects', '')
PRINT @count
SET @count = dbo.fc_ContaReg istros_x_Criter io('crk.dbo.aca o', 'where cod_acao is null')
PRINT @count
*/
DECLARE
@int_objSQL INT,
@int_erros INT,
@int_objSelectC ountResult INT,
@bint_SelectCou nt BIGINT,
@sql NVARCHAR(2000)

EXEC @int_erros = sp_OACreate 'SQLDMO.SQLServ er', @int_objSQL OUTPUT
EXEC @int_erros = sp_OASetPropert y @int_objSQL, 'LoginSecure', TRUE
EXEC @int_erros = sp_OAMethod @int_objSQL, 'Connect', null, '.'
--SET @sql = 'SELECT count(*) FROM ' + @str_TBName + ' WHERE ' + @str_Criter
SET @sql = 'SELECT count(*) FROM ' + @str_TBName + ' ' + @str_Criter
SET @sql = 'ExecuteWithRes ults("' + @sql + '")'
EXEC @int_erros = sp_OAMethod @int_objSQL, @sql, @int_objSelectC ountResult OUTPUT
EXEC @int_erros = sp_OAMethod @int_objSelectC ountResult, 'GetRangeString (1, 1)', @bint_SelectCou nt OUT
EXEC @int_erros = sp_OADestroy @int_objSQL
-- debug info: not valid inside a fc
--if @int_erros <> 0 EXEC sp_OAGetErrorIn fo @int_objSQL else print 'ok'
if @int_erros <> 0 SET @bint_SelectCou nt = @int_erros
RETURN @bint_SelectCou nt
END
GO
SET QUOTED_IDENTIFI ER OFF
GO
SET ANSI_NULLS ON
GO
--------------------------------

I know your case is a little different, but I’m sure you can use this udf as a guideline to help you.

Best wishes,
Josue Monteiro Viana