Question

I have a stored procedure build update query and store in temp table each time in loop.

Total query built UNKNOWN (2 to 4)

How can I put multi query in a transaction?

For example, temp table contains following rows in column EXPSQL (nvarchar)

id   EXPSQL
1    Update tableA SET Name = 'Test' WHERE id=1
2    Update tableB SET Name = 'Test2' WHERE id=10

How can I begin a transaction for a loop to exec above query? or is there any other way?

while @id < total
begin
    set @id = @id +1
    select @SQL = EXPSQL FROM #TEMPTABLE WHERE id=@id
    EXEC (@SQL)
end

Thanks

Answer 1

If you want to execute all as one:

begin transaction

while @id < total
begin
    set @id = @id +1
    select @SQL = EXPSQL FROM #TEMPTABLE WHERE id=@id
    EXEC (@SQL)

    -- if a error occurs go back to the original state
    if(@@error <> 0)
       rollback transaction
end

commit transaction

---

If you want to execute each one individually:

while @id < total
begin
    set @id = @id +1
    select @SQL = EXPSQL FROM #TEMPTABLE WHERE id=@id

    begin transaction
    EXEC (@SQL)

    -- if a error occurs go back to the original state
    if(@@error <> 0)
       rollback transaction
    else
       commit transaction
end