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Stored Procedure EXEC @string get output

Posted on 2002-03-16
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Last Modified: 2013-11-18
Hi,

This is sort of an on going thing I've been working out (with help from EE). I have a SP that needs to work with a dynamic table name which is passed in as a parameter. I've got this working in most cases but am stuck trying to return a variable from the executed string to the rest of the stored procedure. Previously I have managed to define a global cursor which is created in the EXEC statement but available to the rest of the SP.

How do you specify a global @variable?

I have code some thing like:

CREATE PROCEDURE someName
@tablePreifx varchar(50),
@Date as dateTime,
@needToGetThisOut nvarchar(50) output

SET @sSQL = '

SET @needToGetThisOut = (SELECT someColumn FROM [' + @tablePrefix  + 'Bookings]
WHERE Date = @Date'
EXEC sp_executesql @sSQL, N'@Date datetime', @Date = @Date

SELECT @needToGetThisOut

With this code the @needToGetThisOut is null, it does hold the value it was assigned in the sSQL string.

I know that to use the @Date var dynamically (which is required in the real SP) in the sSQL string, it needed to be defined and passed in on the execute line.

 I guess I need away to pass out the variable from the execute string, or make it global? How do I do either of these?

Thanks in Advance,

Andrew
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Question by:andyknott
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12 Comments
 
LVL 6

Expert Comment

by:curtis591
ID: 6870912
I think it will work if after the first select in the string you put your second select
What I am talking about is take this part and go like this
....
WHERE Date = @Date'
and go like
...
WHERE Date = @Date
SELECT @needToGetThisOut '
 
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Author Comment

by:andyknott
ID: 6870924
Hi,

I tried that, the parameter value does not get back to the command that called it.

Thanks
0
 
LVL 6

Expert Comment

by:curtis591
ID: 6870935
Will this work for you?

SET @sSQL = 'SELECT someColumn FROM [' + @tablePrefix +'Bookings]
WHERE Date = ''' + convert(char(10),@Date,101)   +''''


EXEC sp_executesql @sSQL
0
 

Author Comment

by:andyknott
ID: 6870947
That would work in the example above - but not in the real SP which i did not post as it is long and complicated. The actual one uses the value of @Date dynamically. Also it would not help me get the output var out.

Is there away to pass a param out, just like I pass the @date in. Or a global @var? I've done something similar with a global cursor - created it in an executes string but used it in the rest of the SP afterwards.

Thanks
0
 
LVL 6

Expert Comment

by:curtis591
ID: 6870948
Will this work for you?

SET @sSQL = 'SELECT someColumn FROM [' + @tablePrefix +'Bookings]
WHERE Date = ''' + convert(char(10),@Date,101)   +''''


EXEC sp_executesql @sSQL
0
 
LVL 6

Expert Comment

by:curtis591
ID: 6870961
Whoops I didn't mean to do that.  Darn refresh button.  Hmm.  I am not sure how you can get around it.  I have never had a case with the output parameter.   Sorry.
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Author Comment

by:andyknott
ID: 6870967
Thanks anyway,

Hopefully someone will have an idea.
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LVL 18

Expert Comment

by:nigelrivett
ID: 6871097
Is what you want just to set a parameter via sp_executesql?

declare @i int
exec sp_executesql N'select @i = 999', N'@i int output', @i output
select @i



To get the return from an SP call

declare @OutputParameter varchar(100) ,
        @error int ,
        @SPName varchar(128) ,
        @SPCall nvarchar(128) ,
        @rc int
select @SPCall = 'exec ' + @SPName + ' @OutputParameter output'
exec @rc = sp_executesql @SPCall, N'@OutputParameter varchar(100) output', @OutputParameter output
select @Error = @@error

0
 

Author Comment

by:andyknott
ID: 6871233
Hi nigelrivett,

Thanks for the response.

declare @i int
exec sp_executesql N'select @i = 999', N'@i int output', @i output
select @i

This looks like exactly what i need. I can't get it to work though. I have many inputs (like @Date) in my example that get passed in. What would the exec sp_executesql line look like with inputs as well?

Currently my exec statement looks something like -

EXEC sp_executesql @tempStr, N'
@Time dateTime,
@Name nvarchar(60),
@No_Of_Guests tinyint,
@User_ID int,
@Booked_By_User bit,
@Special_Text nvarchar(200),
@Pay_Scheme nvarchar(60),
@Time_Created dateTime',

@Time = @Time,
@Name = @Name,
@No_Of_Guests = @No_Of_Guests,
@User_ID = @User_ID,
@Booked_By_User = @Booked_By_User,
@Special_Text = @Special_Text,
@Pay_Scheme = @Pay_Scheme,
@Time_Created = @Time_Created

Thanks
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LVL 18

Accepted Solution

by:
nigelrivett earned 50 total points
ID: 6873032
What is @tempStr
If it is like the example then it is just setting variables.

In which case
declare @Time datetime ,
@Name nvarchar(60)
declare @tempStr nvarchar(1000) ,
@Params nvarchar(1000)
select @tempStr = 'select @Time = getdate(), @Name = ''me'''
select @Params = '
@Time dateTime output,
@Name nvarchar(60) output'

EXEC sp_executesql @tempStr, @Params ,
@Time output, @Name output

select @Time, @Name

should work.
Just add the other variables.
Maybe you are hitting a string size limit?
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Expert Comment

by:Moondancer
ID: 6913506
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ID: 7082345
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