How to maintain Atomicity in Appian - while Persisting Transactional Data

RE: How to maintain Atomicity in Appian - while Persisting Transactional Data

chandu — Wed, 01 Aug 2018 16:55:17 GMT

This is the good approach I can say. Using stored procedure is other option but we can make use of WTMDS here, since your requirement will get satisfied by WTMDS.

RE: How to maintain Atomicity in Appian - while Persisting Transactional Data

Stefan Helzle — Wed, 01 Aug 2018 11:41:15 GMT

Our best practice to put logic into a WTMDS node is to use expressions returning a list of entityData structures. This way you can do any checks you like and only write to DB if all your items is OK. The write to DB itself will be transactional.

RE: How to maintain Atomicity in Appian - while Persisting Transactional Data

mohamedt808 — Wed, 01 Aug 2018 11:22:59 GMT

@ejass, why not place a null check ??

RE: How to maintain Atomicity in Appian - while Persisting Transactional Data

dipaki — Wed, 01 Aug 2018 10:01:54 GMT

Thanks for your words. I am glad you find it helpful!

RE: How to maintain Atomicity in Appian - while Persisting Transactional Data

anjiv0001 — Wed, 01 Aug 2018 09:40:05 GMT

Thank you Dipaki for your detailed explaination about stored procedure in <a href="mindmajix.com/.../a>

RE: How to maintain Atomicity in Appian - while Persisting Transactional Data

ejass — Wed, 01 Aug 2018 09:18:52 GMT

Hi Shanmukha,
Yes i was having the logic for checking and validating the data for persisting. But i was testing the Atomicity of the Write to Multiple Data Store Entities..

If the Write to Multiple Data Store Entities Service is providing the Atomicity as default then i can avoid using the Stored Procedures for insert/update for the transactional Data.

RE: How to maintain Atomicity in Appian - while Persisting Transactional Data

Shanmukha — Wed, 01 Aug 2018 09:01:36 GMT

Hi Ejass,

Did you have any logic in front of the node(multiple data store) to check that whether the 1st entity is empty or not like it is empty you don't need to call the next node (in your case it is multiple data store). This might be basic thing you might have already checked it but just wanted to double check wit you.

RE: How to maintain Atomicity in Appian - while Persisting Transactional Data

ejass — Wed, 01 Aug 2018 08:50:15 GMT

Alright jurim409, But if one Entity is empty... it should not do any update in any of the other Entities... This is the condition

RE: How to maintain Atomicity in Appian - while Persisting Transactional Data

dipaki — Wed, 01 Aug 2018 08:36:17 GMT

Hi ejass ,

I was having the same kind of requirement. In such cases I would suggest to use Stored procedure in database and call execute the stored procedure using executestoredprocedure() plug-in function. Write your insert queries in between START TRANSACTION and COMMIT/ROLLBACK

BEGIN

...

START TRANSACTION;

..statement 1..
..statement 2..
..statement 3..

IF <condition> THEN
COMMIT;
ELSE
ROLLBACK
END IF;

END

RE: How to maintain Atomicity in Appian - while Persisting Transactional Data

jurim409 — Wed, 01 Aug 2018 08:29:53 GMT

Hi ejass,
according to me, you have to insert a condition in the 2nd a!entityData of the multipleDataStore. So, if 1st entity is empty, you don't update the 2nd Entity