sqlserver transaction nesting

Reference https://www.cnblogs.com/JentleWang/p/3654603.html

       https://blog.csdn.net/tuzhen007/article/details/11183961

 

create proc proc_example
as
begin
    --declare a variable to store the number of transactions currently opened
    declare @exist_trancount int
    select @exist_trancount = @@trancount

    if @exist_trancount > 0
        --Create transaction savepoint
        save transaction tran_proc
    else
        -- start a new transaction
        begin transaction tran_proc
        
    /*
        Stored procedure business processing code
        ·········
    */
    if @@error<>0
        goto error


    if @exist_trancount = 0
        -- commit transaction
        commit tran tran_proc
        return 1
    error:
        --Rollback transaction or transaction savepoint
        rollback transaction tran_proc
        return -1

end

• A committed transaction cannot be undone or rolled back.
• @@trancount is equal to 0 when there are no open transactions.
• Execute the begin tran [tranName] statement to increment @@trancount by 1.
• Execute the commit tran [tranName] statement to decrease @@trancount by 1.
• Executing a rollback tran rolls back the entire transaction and sets @@trancount to 0.