How do I use dynamic table name in SQL function

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Hi,

I have a sql store procedure than runnig in parallel.
The process write to temp table that contain session id in the last
so that each process has its own temp table.

example

SQL

##temp_table + CONVERT(varchar(10),(select @@SPID))

The tables that created

##temp_table_121
##temp_table_122

The problem

I need to select data from these tables in function.
But in function I can't use dynamic sql.

How can I use these tables in function?

What I have tried:

Using dynamic sql in function - I gen an error

Posted 7-Sep-16 22:58pm

Member 8092498

Updated 10-Sep-16 20:22pm

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Herman<T>.Instance 8-Sep-16 5:44am

Add brackets [] around it like:
[##temp_table_121]
[##temp_table_122]

Member 8092498 8-Sep-16 5:56am

I don't know the name of the tables.
I retreive it by using ##temp_table + CONVERT(varchar(10),(select @@SPID))
so it's dynamic

PeejayAdams 8-Sep-16 6:05am

It simply can't be done in a UDF. You could try using a CLR function.

Member 8092498 8-Sep-16 6:52am

What is CLR function?

Karthik_Mahalingam 9-Sep-16 1:24am

udf ?

2 solutions

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David_Wimbley · Answer 1 · 2016-09-08T08:00:00

Solution 1

Based on what i think you are trying to do, you need to use exec sp_executesql. Here is an example.

SQL

IF OBJECT_ID('tempdb..#MyTempTable') IS NOT NULL DROP TABLE #MyTempTable
		CREATE TABLE #MyTempTable
		(
			Id INT NULL
		)

DECLARE @TableName VARCHAR(200) = '#MyTempTable';

DECLARE @Sql NVARCHAR(500) = 'SELECT * FROM ' + @TableName;


EXEC sp_executesql @Sql

Posted 8-Sep-16 8:00am

David_Wimbley

Updated 8-Sep-16 8:01am

v2

Comments

Member 8092498 11-Sep-16 1:40am

I can't use sp_executesql in sql function..

Member 8092498 · Answer 2 · 2016-09-10T20:22:00

Solution 2

My solution:
I have created a SQL table type.
In the store procedure than run the function I have declared an object of this type, insert the temp table data to this object and passed it to the function.

Posted 10-Sep-16 20:22pm

Member 8092498