SQL Server dynamic SQL statements assign values to variables

Source: Internet
Author: User

Execute the following SQL

Declare   @ T   Int

Exec ( 'Set @ T = 1 ' )

Print ( @ T )

The following error is reported!

Server: Message 137, Level 15, status 2, Row 1

Variables must be declared
'@ T'.


Actually, variables and dynamic statements cannot be shared,

In this case,
Declare @ T Int

Set @ T=1

Print(@ T)


Exec ( ' Declare @ t int;

Set @ T = 1;

Print (@ T) ' )

But sometimes you must combine variables with dynamic SQL.

For example, you define an output parameter in the stored procedure, ◎ count int output

The best way to obtain this value is dynamic SQL. Is there any good way?

The system stored procedure, sp_executesql


Declare   @ Sql2   Nvarchar ( 500 )

Set   @ Sql2   =   ' Select @ COUNT = count (distinct ( ' + @ Groupby + ' ) From tg_entry where ' + @ Sqlwhere

Execute Sp_executesql

@ Sql2 ,

N ' @ Count int output ' ,

@ Total_count Output


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