This is a coding example working on IRIS 2020.1 and on Caché 2018.1.3 It will not be kept in sync with new versions It is also NOT serviced by InterSystems Support !
Other Sync-Tools just work from Caché/IRIS to Caché/IRIS.
Synchronizing your data to some external DB requires some other solution.
The solution is available in Caché/IRIS since quite some time and works excellent.
^OBJ.DSTIME does the magic.
It was built to allow data synchronization with DeepSee.
It keeps a very simple journal on Object/Table changes by signaling Modified,New,Deleted
This could be useful not only for DeepSee but for any other type of Table Synchronization.
The Global ^OBJ.DSTIME has 2 additional features
It is wrapped in a persistent class %SYSTEM.DSTIME
so you can use it also as normal SQL Table to select your changes
It maintains a version ID (named DSTIME) that allows control of synchronized junks:
+ you fetch the last version
+ increase the version
+ and then you upload your changes wherever you require them
And as you do the synchronization by pure SQL your target can be any DB understanding SQL.
I extended class %SYSTEM.DSTIME to allow Pure SQL Operation
The demo class is a copy of Sample.Person amd it runs in namespace SAMPLES.
SAMPLES>write ##class(OBJ.Person).Populate(15) 15 SAMPLES>do $system.SQL.Shell() SAMPLES>>DELETE FROM OBJ.PERSON WHERE ID IN (2,5,9) SAMPLES>>Update OBJ.PERSON SET NAME='Robert' WHERE ID IN (3,7)
Now we can take a look on OBJ.DSTIME
SAMPLES>>SELECT * FROM OBJ.DSTIME DSTIME ClassName ObjectId FilingOp LastVersion Version 0 OBJ.Person 1 1 0 0 0 OBJ.Person 2 2 0 0 0 OBJ.Person 3 0 0 0 0 OBJ.Person 4 1 0 0 0 OBJ.Person 5 2 0 0 0 OBJ.Person 6 1 0 0 0 OBJ.Person 7 0 0 0 0 OBJ.Person 8 1 0 0 0 OBJ.Person 9 2 0 0 0 OBJ.Person 10 1 0 0 0 OBJ.Person 11 1 0 0 0 OBJ.Person 12 1 0 0 0 OBJ.Person 13 1 0 0 0 OBJ.Person 14 1 0 0 0 OBJ.Person 15 1 0 0
next we set a new version
and generate some more Persons
These new records have a new version.
So you may export easily all changes from the previous version of OBJ.DSTIME
during normal operation while any additional changes are logged with the new version.
INSERT INTO MySQL.Person (name,DOB,SSN) select Name,DOB,SSN from OBJ.Person p JOIN OBJ.DSTIME d on p.ID = d.ObjectId where d.ClassName='OBJ.Person' and Version = 0
This solution uses the actual content of your Objects / Tables. So if the version of the object log is out of date you may see some newer content if additional changes were applied since.