execute a string

I am trying to create a string dynamically and then get it executed.  My problem is that the string may be 100 chars long or up to 600 chars.  I can get the sql to create the srting in the correct syntax.  I have used a very simple of select in order to make it easy

my problem is that the code below Parses Ok but when I execute it says

Msg 2812, Level 16, State 62, Line 5
Could not find stored procedure 's'.

This is confusing as I am not trying to create a SP

Also, is there specific syntax that I am missing

Any ideas please

Thanks from the novice

Adrian
declare @string as varchar
 
set @string = 'select * from [dbo].[expenseheader]'
 
EXEC @string

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wrcplcAsked:
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Raja Jegan RSQL Server DBA & Architect, EE Solution GuideCommented:
Hope this helps:
declare @string nvarchar(1000);
set @string = 'select * from [dbo].[expenseheader]';
EXEC sp_executesql @string;

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Guy Hengel [angelIII / a3]Billing EngineerCommented:
2 errors: varchar must be size specified
exec (string), oitherwise string is considered a stored proc
declare @string as varchar(200)
 
set @string = 'select * from [dbo].[expenseheader]'
 
EXEC(@string)

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Raja Jegan RSQL Server DBA & Architect, EE Solution GuideCommented:
>> EXEC @string

As you call exec statement here it searches for a procedure next and throws out that error.
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Chandan_GowdaCommented:
declare @string as varchar
set @string = 'select * from [dbo].[expenseheader]'
EXEC (@string )
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Chandan_GowdaCommented:
you dont have to change anything...Just add brackets
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Raja Jegan RSQL Server DBA & Architect, EE Solution GuideCommented:
angelIII,

I suggested using sp_executesql since this syntax EXEC(@string) will be deprecated after 2005
And string should be declared as nvarchar instead of varchar.

Kindly correct if I am wrong.
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wrcplcAuthor Commented:
Thank you all.  So many so quick.

Sorry to have taken your time but feel safe in the knowledge you have all saved me from hours of research

Again, thanks

adrian
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
Hi,
>I suggested using sp_executesql since this syntax EXEC(@string) will be deprecated after 2005
new to me, but good to know.
you could have put that in the first comment :)

>And string should be declared as nvarchar instead of varchar.
for sp_executesql: yes, required.
for exec: not required

for  the rest, I explained the 2 original issues with the code in my comment.

a3
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Microsoft SQL Server 2005

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