T-SQL loop over SQL Select query results

select @id=table.id from table and I need to loop over the results so I can exec a store  procedure for each row exec stored_proc @varName=@id,@otherVarName='test'

How can I do this in a T-SQL script?

You could use a CURSOR in this case:

DECLARE @id INT
DECLARE @name NVARCHAR(100)
DECLARE @getid CURSOR

SET @getid = CURSOR FOR
SELECT table.id,
       table.name
FROM   table

OPEN @getid
FETCH NEXT
FROM @getid INTO @id, @name
WHILE @@FETCH_STATUS = 0
BEGIN
    EXEC stored_proc @varName=@id, @otherVarName='test', @varForName=@name
    FETCH NEXT
    FROM @getid INTO @id, @name
END

CLOSE @getid
DEALLOCATE @getid

Cursor is a database objects to retrieve data from a result set one row at a time, instead of the T-SQL commands that operate on all the rows in the result set at one time. We use cursor when we need to update records in a database table in singleton fashion means row by row.


Cursor Flow



Declare Cursor

A cursor is declared by defining the SQL statement that returns a result set.


Open

A Cursor is opened and populated by executing the SQL statement defined by the cursor.


Fetch

When cursor is opened, rows can be fetched from the cursor one by one or in a block to do data manipulation.


Close

After data manipulation, we should close the cursor explicitly.


Deallocate

Finally, we need to delete the cursor definition and released all the system resources associated with the cursor.





Syntax of Cursor


Declare Cursor SQL Comaand is used to define the cursor with many options that impact the scalablity and loading behaviour of the cursor. The basic syntax is given below


 DECLARE cursor_name CURSOR
 [LOCAL | GLOBAL] --define cursor scope
 [FORWARD_ONLY | SCROLL] --define cursor movements (forward/backward)
 [STATIC | KEYSET | DYNAMIC | FAST_FORWARD] --basic type of cursor
 [READ_ONLY | SCROLL_LOCKS | OPTIMISTIC] --define locks
 FOR select_statement --define SQL Select statement
 FOR UPDATE [col1,col2,...coln] --define columns that need to be updated 





Syntax to Open Cursor


A Cursor can be opened locally or globally. By default it is opened locally. The basic syntax to open cursor is given below:


 OPEN [GLOBAL] cursor_name --by default it is local 





Syntax to Fetch Cursor


Fetch statement provides the many options to retrieve the rows from the cursor. NEXT is the default option. The basic syntax to fetch cursor is given below:


 FETCH [NEXT|PRIOR|FIRST|LAST|ABSOLUTE n|RELATIVE n]
FROM [GLOBAL] cursor_name 
INTO @Variable_name[1,2,..n] 





Syntax to Close Cursor


Close statement closed the cursor explicitly. The basic syntax to close cursor is given below:


 CLOSE cursor_name --after closing it can be reopen 





Syntax to Deallocate Cursor


Deallocate statement delete the cursor definition and free all the system resources associated with the cursor. The basic syntax to close cursor is given below:


 DEALLOCATE cursor_name --after deallocation it can't be reopen