How to roll back when procedure fails

Question

Hi All,
In my process using procedures i am droping the temp tables and creating temp tables ,if any procedures fails how should roll back all the process
Procedure1(droping tables)----->procedure2(creating table1)--------->procedure3(creating table2)------->procedure4(Validaating accounts in table2 and creating seperate table)
Any suggestion please
Thanks in Advance

Answer 1

Let's say in your package you have your 4 procedures (Proc1, Proc2, Proc3, Proc4).
Also create 3 additional procedures:
RollBack1 -> Does the opposite to Proc1 (i.e. if Proc1 drops a table, then Rollback1 will create it)
RollBack2 -> Does the opposite to Proc2
RollBack3 -> Does the opposite to Proc3
Your logic will be:
If Proc1 is successful, then execute Proc2.
If Proc1 is unsuccessful, then end.
If Proc2 is successful, then execute Proc3.
If Proc2 is unsuccessful, then use an on failure path (red line) to execute RollBack1.
If Proc3 is successful, then execute Proc4.
If Proc3 is unsuccessful, then use an on failure path (red line) to execute RollBack2, followed by RollBack1.
If Proc4 is successful, then end.
If Proc4 is unsuccessful, then use an on failure path (red line) to execute RollBack3, followed by RollBack2, followed by RollBack1.
It mightn't be necessary to undo everything - but you'll know your own business needs to make a decision on that.