Dyncamic SQL

Hi
I am trying to populate a Temp table with dynamic SQL but it does not seem
to work and the error message returned is that is it an invalid object,
leading me to believe that it does not get created:
-- ****************************************
********
USE Pubs
GO
SET @.SQLString = ' SELECT * INTO #TempParamFilter FROM Authors '
EXEC (@.SQLString)
SELECT * FROM #TempParamFilter
-- ****************************************
********
Is there something wrong with my syntax?
Kind Regards
RickyThe problem is SCOPE. The # temp table you created goes away after the
dynamic SQL finishes executing. Based on what you posted, you don't even
need dynamic SQL to do this particular job:
USE Pubs
GO
SELECT * INTO #TempParamFilter FROM Authors
SELECT * FROM #TempParamFilter
DROP TABLE #TempParamFilter
"Ricky" <ricky@.msn.com> wrote in message
news:eFBaWbVkGHA.1260@.TK2MSFTNGP05.phx.gbl...
> Hi
> I am trying to populate a Temp table with dynamic SQL but it does not seem
> to work and the error message returned is that is it an invalid object,
> leading me to believe that it does not get created:
> -- ****************************************
********
> USE Pubs
> GO
> SET @.SQLString = ' SELECT * INTO #TempParamFilter FROM Authors '
> EXEC (@.SQLString)
> SELECT * FROM #TempParamFilter
>
> -- ****************************************
********
> Is there something wrong with my syntax?
> Kind Regards
> Ricky
>|||Hi Mike
It was a simple example, I should have posted the real situation. What I am
really trying to achieve is a dynamic WHERE clause, appended to a table and
then populate a temporary table. Is this possible.
I mention Dynamic WHERE clause, since the Column may change, depending on
the parameter supplied.
e.g
@.StockParam = 'Q1HTS'
then WHERE clause would be : WHERE QStock = @.StockParam
or
@.StockParam = 'T1HTS'
then WHERE clause would be : WHERE AlphaStock = @.StockParam
so what I thought about doing, was to have my basic select statement and
then append a dynamic WHERE clause as a variable and then populate a #Table
to SELECT from , later when compiling the final recordset.
Hope this makes sense.
Kind Regards
Ricky
"Mike C#" <xyz@.xyz.com> wrote in message
news:ePpmqeVkGHA.4304@.TK2MSFTNGP03.phx.gbl...
> The problem is SCOPE. The # temp table you created goes away after the
> dynamic SQL finishes executing. Based on what you posted, you don't even
> need dynamic SQL to do this particular job:
> USE Pubs
> GO
> SELECT * INTO #TempParamFilter FROM Authors
> SELECT * FROM #TempParamFilter
> DROP TABLE #TempParamFilter
> "Ricky" <ricky@.msn.com> wrote in message
> news:eFBaWbVkGHA.1260@.TK2MSFTNGP05.phx.gbl...
seem
>|||The problem is that the temp table is available only within the scope of
EXEC. Either use a global temp table or use the SELECT within the scope of
the EXEC like:
SET @.SQLString = ' SELECT * INTO #TempParamFilter FROM Authors;
SELECT * FROM #TempParamFilter '
EXEC (@.SQLString) ;
Anith|||Probably not the most performant, but
WHERE
QStock = CASE @.StockParam
WHEN 'Q1HTS' THEN @.StockParam
ELSE QStock END
AND
AlphaStock = CASE @.StockParam
WHEN 'T1HTS' THEN @.StockParam
ELSE AlphaStock END
What do you need a #temp table for?
"Ricky" <ricky@.msn.com> wrote in message
news:uZZ7NjVkGHA.3816@.TK2MSFTNGP02.phx.gbl...
> Hi Mike
> It was a simple example, I should have posted the real situation. What I
> am
> really trying to achieve is a dynamic WHERE clause, appended to a table
> and
> then populate a temporary table. Is this possible.
> I mention Dynamic WHERE clause, since the Column may change, depending on
> the parameter supplied.
> e.g
>
> @.StockParam = 'Q1HTS'
> then WHERE clause would be : WHERE QStock = @.StockParam
> or
> @.StockParam = 'T1HTS'
> then WHERE clause would be : WHERE AlphaStock = @.StockParam
> so what I thought about doing, was to have my basic select statement and
> then append a dynamic WHERE clause as a variable and then populate a
> #Table
> to SELECT from , later when compiling the final recordset.
> Hope this makes sense.
> Kind Regards
> Ricky
>
>
> "Mike C#" <xyz@.xyz.com> wrote in message
> news:ePpmqeVkGHA.4304@.TK2MSFTNGP03.phx.gbl...
> seem
>|||Hi Anith
How does the second SELECT embedded in the Dynamic SQL overcome the issue?
Kind Regards
Ricky
"Anith Sen" <anith@.bizdatasolutions.com> wrote in message
news:%23BOJrnVkGHA.1640@.TK2MSFTNGP02.phx.gbl...
> The problem is that the temp table is available only within the scope of
> EXEC. Either use a global temp table or use the SELECT within the scope of
> the EXEC like:
> SET @.SQLString = ' SELECT * INTO #TempParamFilter FROM Authors;
> SELECT * FROM #TempParamFilter '
> EXEC (@.SQLString) ;
> --
> Anith
>|||"Ricky" <ricky@.msn.com> wrote in message
news:uZZ7NjVkGHA.3816@.TK2MSFTNGP02.phx.gbl...
> Hi Mike
> It was a simple example, I should have posted the real situation. What I
> am
> really trying to achieve is a dynamic WHERE clause, appended to a table
> and
> then populate a temporary table. Is this possible.
> I mention Dynamic WHERE clause, since the Column may change, depending on
> the parameter supplied.
> e.g
>
> @.StockParam = 'Q1HTS'
> then WHERE clause would be : WHERE QStock = @.StockParam
> or
> @.StockParam = 'T1HTS'
> then WHERE clause would be : WHERE AlphaStock = @.StockParam
> so what I thought about doing, was to have my basic select statement and
> then append a dynamic WHERE clause as a variable and then populate a
> #Table
> to SELECT from , later when compiling the final recordset.
It's possible if you create the temp table before executing the dynamic sql.
Here's an example to get you started. Note that the temp table is created
outside of the dynamic SQL, but the dynamic SQL has access to it. It won't
work the other way around. Also note that this example uses sp_executesql
to parameterize the query. sp_executesql requires NVARCHAR data, and helps
protect against SQL injection:
USE pubs
GO
CREATE TABLE #temp_emp(emp_id VARCHAR(9) NOT NULL PRIMARY KEY,
fname VARCHAR(30) NOT NULL,
minit CHAR(1) NOT NULL,
lname VARCHAR(30) NOT NULL)
DECLARE @.emp_last_name NVARCHAR(30)
SELECT @.emp_last_name = N'Smith'
DECLARE @.dyn_sql NVARCHAR(512)
SELECT @.dyn_sql = N'INSERT INTO #temp_emp (emp_id, fname, minit, lname) ' +
N'SELECT emp_id, fname, minit, lname ' +
N'FROM employee ' +
N'WHERE lname = @.lname'
EXEC dbo.sp_executesql @.dyn_sql, N'@.lname NVARCHAR(30)', @.lname =
@.emp_last_name
SELECT *
FROM #temp_emp
DROP TABLE #temp_emp|||> How does the second SELECT embedded in the Dynamic SQL overcome the issue?
Because a single EXEC() call represents one 'scope' (I'm not sure if that's
a valid noun there, but oh well). The second SELECT is occuring in the same
scope as that which created the #temp table.|||Another way to think about the scope of something like EXEC() is a typical
popup window in a browser (the good kind, not the annoying advertisements).
In most cases, the popup window could jump through several different pages
and do all kinds of things, and the window that opened it couldn't care less
and usually doesn't have any knowledge of what is going on in the popup.
"Ricky" <ricky@.msn.com> wrote in message
news:OPO%23KpVkGHA.1272@.TK2MSFTNGP03.phx.gbl...
> Hi Anith
> How does the second SELECT embedded in the Dynamic SQL overcome the issue?
> Kind Regards
> Ricky
> "Anith Sen" <anith@.bizdatasolutions.com> wrote in message
> news:%23BOJrnVkGHA.1640@.TK2MSFTNGP02.phx.gbl...
>|||"Aaron Bertrand [SQL Server MVP]" <ten.xoc@.dnartreb.noraa> wrote in message
news:u4VydtVkGHA.4368@.TK2MSFTNGP03.phx.gbl...
> Because a single EXEC() call represents one 'scope' (I'm not sure if
> that's a valid noun there, but oh well). The second SELECT is occuring in
> the same scope as that which created the #temp table.
You know, I always hated the phrase "well-defined scope" for table
variables, etc. It implies that everything else has "poorly-defined scope"
:) But from a marketing perspective I guess "well-defined scope" sounds
better than "limited scope" or "extremely tight scope" :)