Can you change databases inside a SQL cursor? - tsql

Question

I have a cursor, inside a proc that is run from a db we use to store utilities. I need the cursor to dynamically change databases before is does the FETCH NEXT FROM /INTO #; part so that it loops through the correct rows in the correct database.
CREATE OR ALTER PROCEDURE utils.post_cohesity_restore
AS
Begin
/* PURPOSE: re-attaches orphaned users and grants permissions after a Cohesity restore */
SET NOCOUNT ON;
DECLARE
#juris char(20),
#sql char(400),
#sql_A char(400),
#database sysname,
#users char(20);
SELECT
#database = destination_database_name
FROM
[msdb].[dbo].[restorehistory]
WHERE
restore_date >= dateadd(DAY,-3,getDate())
AND (LOWER(destination_database_name) LIKE '%clientdata%'
OR LOWER(destination_database_name) LIKE '%analysis%'
OR LOWER(destination_database_name) LIKE '%migration%')
SELECT
#juris = LEFT(#database,
CASE
WHEN CHARINDEX('ClientData', #database) <> 0
THEN (CHARINDEX('ClientData', #database)-1)
WHEN CHARINDEX('Migration', #database) <> 0
THEN (CHARINDEX('Migration', #database)-1)
WHEN CHARINDEX('Analysis', #database) <> 0
THEN (CHARINDEX('Analysis', #database)-1)
END)
DECLARE users_cursor CURSOR
FOR SELECT
dp.[name] as username
FROM sys.database_principals AS dp
LEFT JOIN sys.server_principals AS sp
ON dp.[name] = sp.[name]
WHERE
sp.sid <> dp.sid;
OPEN users_cursor;
FETCH NEXT FROM users_cursor INTO
#users;
WHILE ##FETCH_STATUS = 0
BEGIN
SET #sql = ('USE ' + #database
+ '; ALTER USER ' + rtrim(#users) + ' WITH LOGIN = ' + rtrim(#users))
PRINT #sql; -- for testing/seeing the EXEC below
EXEC (#sql);
FETCH NEXT FROM users_cursor INTO
#users;
END;
CLOSE users_cursor;
DEALLOCATE users_cursor;
SET #sql_A = ('USE ' + #database
+ '; GRANT EXECUTE TO [analyst]; GRANT VIEW DEFINITION TO [analyst];'
+ ' ALTER ROLE [ddladmin] ADD MEMBER [analyst]; ALTER ROLE [datawriter] ADD MEMBER [analyst];')
PRINT #sql_A; -- for testing/seeing the EXEC below
EXEC (#sql_A );
END
I need to switch to the db that populates #database right around this point so that the users end up being form that database.
DECLARE users_cursor CURSOR
FOR SELECT
dp.[name] as username
FROM sys.database_principals AS dp
LEFT JOIN sys.server_principals AS sp
ON dp.[name] = sp.[name]
WHERE
sp.sid <> dp.sid;
OPEN users_cursor;
FETCH NEXT FROM users_cursor INTO
#users;
Any thoughts? It is even possible?

Answer 1

I ended up saving an edited version of the proc above in each database then creating an SSA job that a)identifies the database and b)calls that database's version of the proc.