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Read a Temp Table in a stored procedure

Posted on 2006-11-14
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Last Modified: 2008-02-01
In sql server 2000.
I have a temp table in a stored procedure,
I want to read through the temp table and examine each column in each of the rows of that table.
How would I do that.
I also need to determine if the table is empty or not before I start reading it.

Thanks

Laurence

 
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Question by:misdevelopers
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6 Comments
 
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Expert Comment

by:rw3admin
ID: 17943368
You mean inside the proc? you can read the temp table just like regular table, you cannot reference this table outside the proc as Temp table is only local to the proc, actually local only to the session in which proc ran so you cannot say

select * from sMyProc.#TmpTable
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Author Comment

by:misdevelopers
ID: 17943378
Yes, I want to reference it inside the proc.
But I don't want to just create a recordset from the temp table.
I want to read through the temp table and examine each row and each column in each row.

I want to pass back just a few values from the recordset as OUPUT parameters,
rather than having to pass back the recordset (that was created from the temp table).

This is called thousands of times, for a report.

Laurence  
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Expert Comment

by:Anthony Perkins
ID: 17943620
>>But I don't want to just create a recordset from the temp table.<<
The big question is: Why are you doing this?  This is the least efficient way of doing things using T-SQL.  However if you insist look up DECLARE CURSOR in BOL.
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Expert Comment

by:Yogeshup
ID: 17944641
acperkins is right. Maybe you should try assigning the values required to variables using TSQL. That would be much faster. What would be the size of the temporary table? Is it necessary that you do it row-by-row and column-by-column? Maybe I can help if you ca explain what exactly you are looking for.
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Expert Comment

by:imran_fast
ID: 17946719
hi misdevelopers,
Read about table variables and functions inside books online may be that is what you are looking for.
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Accepted Solution

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rw3admin earned 125 total points
ID: 17948248
Laurence
>>I want to read through the temp table and examine each row and each column in each row.<<
I assume there is no human interaction involved in analyzing each row and each column in each row.
you definetly need some programming to logic to take different action for different values in rows/columns.
You can do all of that programatically and in the very same procedure.
Cursors are best at stepping through records and analyzing each column in the current fetched row. Thats exactly what experts here.
If editing current proc is an issue and you dont want to change code in this one, and this proc is just returning data from a temp table or set of temp and physical tables (joining them), then you can still create another proc, create a temp table in that proc and capture data returned from first proc into your second procs temp table.... for example.. and this is very very basic example.

your first proc looks like

create proc sTest_1
as
Select 1 as ID, 2 as Val

You can create second proc as

create proc sTest_2
as
Create Table #T (ID int, Val int) -- create temp table in second proc
Insert #T -- now insert data set returned from 1st proc (sTest_1)
Exec sTest_1
--------- now add your whatever logic here....
declare cursor.......
....
...
..
..

rw3admin



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