Stored Procedure EXEC @string get output


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:

@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,

Who is Participating?
nigelrivettConnect With a Mentor Commented:
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?
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 '
andyknottAuthor Commented:

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

Cloud Class® Course: CompTIA Cloud+

The CompTIA Cloud+ Basic training course will teach you about cloud concepts and models, data storage, networking, and network infrastructure.

Will this work for you?

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

EXEC sp_executesql @sSQL
andyknottAuthor Commented:
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.

Will this work for you?

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

EXEC sp_executesql @sSQL
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.
andyknottAuthor Commented:
Thanks anyway,

Hopefully someone will have an idea.
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

andyknottAuthor Commented:
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

ADMINISTRATION WILL BE CONTACTING YOU SHORTLY.  Moderators Computer101 or Netminder will return to finalize these if still open in seven days.  Please post closing recommendations before that time.

Question(s) below appears to have been abandoned. Your options are:
1. Accept a Comment As Answer (use the button next to the Expert's name).
2. Close the question if the information was not useful to you, but may help others. You must tell the participants why you wish to do this, and allow for Expert response.  This choice will include a refund to you, and will move this question to our PAQ (Previously Asked Question) database.  If you found information outside this question thread, please add it.
3. Ask Community Support to help split points between participating experts, or just comment here with details and we'll respond with the process.
4. Delete the question (if it has no potential value for others).
   --> Post comments for expert of your intention to delete and why
   --> You cannot delete a question with comments, special handling by a Moderator is required.

For special handling needs, please post a zero point question in the link below and include the URL (question QID/link) that it regards with details.
Please click the Help Desk link on the left for Member Guidelines, Member Agreement and the Question/Answer process for further information, if needed.

Click you Member Profile to view your question history and keep them all current with updates as the collaboration effort continues, to track all your open and locked questions at this site.  If you are an EE Pro user, use the Power Search option to find them.  Anytime you have questions which are LOCKED with a Proposed Answer but does not serve your needs, please reject it and add comments as to why.  In addition, when you do grade the question, if the grade is less than an A, please add a comment as to why.  This helps all involved, as well as future persons who may access this item in the future to seek help.

To view your open questions, please click the following link(s) and keep them all current with updates.

------------>  EXPERTS:  Please leave any comments regarding your closing recommendations if this item remains inactive another seven (7) days.  Also, if you are interested in the cleanup effort, please click this link

Moderators will finalize this question if still open in 7 days, by either moving this to the PAQ (Previously Asked Questions) at zero points, deleting it or awarding expert(s) when recommendations are made, or an independent determination can be made.  Expert input is always appreciated to determine the fair outcome.
Thank you everyone.
Moderator @ Experts Exchange
Zero response, finalized by Moondancer - EE Moderator
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.