Need help on Return Value from EXEC()

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Need help on Return Value from EXEC()

Author

Topic

deepakl_2000
Starting Member

8 Posts

Posted - 2009-11-11 : 10:55:20

Hi Forum Memebers,
I have the below issue.


@Group_Name=ABC
SET @ComplexitySQL ='SELECT Complexity FROM  LookUp_Table WHERE Group_Name='''+@Group_Name+''''
EXEC @ComplexitySQL --- WORKS FINE AND DISPLAYS THE SQL.
--REQUIREMENT --> I need the return VALUE OF THIS EXECUTED SQL

----------------------------
Requirement:
----------------------------
1 Issue > It displays the @ComplexitySQL whiich is fine but i need to
Extract the Complexity from Above table --> FOR EXAMPLE:'Average'
I dont know how to Extract the result of EXEC()....Please help

2 Issue > Once I get the return Value from above executed Sql statement.i,e

Assuming i get the @RETURN_VALUE =AVERAGE
I need to do a
SELECT @RETURN_VALUE from SOMEOTHERTABLE WHERE CONDITION=@CONDITION which should be equivalent to
SELECT AVERAGE from SOMEOTHERTABLE WHERE CONDITION=@CONDITION
--->How to Accomplish this....Please help me Please.....

Hope you got what im asking.....
Please help me to achieve this in MY SQL SERVER 2000

Thanks and Regards
Deepak Lal

TG
Master Smack Fu Yak Hacker

6065 Posts

Posted - 2009-11-11 : 11:42:26

not sure why you need dynamic sql for this? Why not:
select complexity from lookup_table where group_name = @group_Name

or assuming one value is returned from that statement:
declare @return_val <complexity's datatype>
select @return_val = complexity from lookup_table where group_name = @group_Name

Be One with the Optimizer
TG

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2009-11-11 : 12:25:54

and if you really want to use dynamic sql due to any complex scenario which you not specified, you need to use sp_executesql rather than EXEC to return variable values through dynamic sql.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2009-11-11 : 12:27:43

http://msdn.microsoft.com/en-us/library/ms188001.aspx

deepakl_2000
Starting Member

8 Posts

Posted - 2009-11-11 : 13:25:26

Hi All,


declare @return_val <complexity's datatype>
select @return_val = complexity from lookup_table where group_name = @group_Name
PRINT @return_val --prints the SQL STATEMENT BUT NOT THE RETURN VALUE

I have done this before as i have told you in my original post but it is printing the SQL STATEMENT QUERY instead of the return value.

Can you tell me how to achieve it.??

sp_executesql will not work either because i do not want to hardcode the value in my program.

I need the value to be passed as a dynamic parameter to my select statement which will return a Value.

Further i need te below to happen

2 Issue > Once I get the return Value from above executed Sql statement.i,e
Assuming i get the @RETURN_VALUE =AVERAGE
I need to do a

 
SELECT @RETURN_VALUE from SOMEOTHERTABLE WHERE CONDITION=@CONDITION

which should be equivalent to
SELECT AVERAGE from SOMEOTHERTABLE WHERE CONDITION=@CONDITION
How should i achieve this issue?

please help me guysss....

When the Going gets Tougher,The Tougher gets Going.

TG
Master Smack Fu Yak Hacker

6065 Posts

Posted - 2009-11-11 : 13:45:21

So your [Complexity] column (for that row) contains the value 'AVERAGE' and the table [SOMEOTHERTABLE] has a column called: [AVERAGE] ??

EDIT:
Well, whatever your requirements are take a look at this example and see if it helps:


create table #lookup_table (group_name varchar(10), complexity varchar(10))
create table #someothertable (average int, condition int)

insert #lookup_table values ('group1', 'AVERAGE')
insert #someothertable values (10, 1)

declare @group varchar(10)
       ,@condition int
       ,@sql nvarchar(200)
       ,@return_val int

select @group = 'group1'
       ,@condition = 1

select @sql = N'select @rv = ' + l.complexity + ' from #someothertable where condition = ' + convert(varchar(1), @condition)
from   #lookup_table l
where  group_name = @group

--print @sql
exec sp_executesql @sql, N'@rv int output', @rv = @return_val output

select @return_val [@return_val]

drop table #lookup_table
drop table #someothertable

OUTPUT:
@return_val
-----------
10

Be One with the Optimizer
TG

deepakl_2000
Starting Member

8 Posts

Posted - 2009-11-12 : 02:08:47

Hi TG,
Thanks for your valuable inputs i did as you have instructed but still im stuck with this issue....

Please need help on this..
im getting the below error.


Procedure expects parameter '@statement' of type 'ntext/nchar/nvarchar'

When the Going gets Tougher,The Tougher gets Going.

TG
Master Smack Fu Yak Hacker

6065 Posts

Posted - 2009-11-12 : 10:19:02

Please notice the datatype of the parameters I declared. sp_exectutesql requires Nvarchar not varchar.

,@sql nvarchar(200)

Be One with the Optimizer
TG

deepakl_2000
Starting Member

8 Posts

Posted - 2009-11-14 : 05:07:04

Thanks a ton TG .,,,,,it worked....

When the Going gets Tougher,The Tougher gets Going.

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