How do I use persistence.persit in javascript?

chaoshome · January 11, 2025, 5:47pm

I’m trying to write data into the jdbc / sqlite persistence in a javascript rule but it doesn’t seem to work correctly.
This is what I try:

var ZDT = (ZDT === undefined) ? Java.type("java.time.ZonedDateTime") : ZDT;
test = items.getItem('test');

today = ZDT.now();
test.sendCommand(-16)
test.persistence.persist(time.toZDT('2025-01-01T12:00'), '-10', 'jdbc')
test.persistence.persist(today, '-15', 'jdbc')

And this is what I get in the sqlite database:

sqlite> SELECT time, value from  test_0173;
┌─────────────────────────┬───────┐
│          time           │ value │
├─────────────────────────┼───────┤
│ 2025-01-11 18:23:54.490 │ -16.0 │
│ 1735729200000           │ -10.0 │
│ 1736616614191           │ -15.0 │
└─────────────────────────┴───────┘

The first line from openhab has a correct datetime but the two others don’t.
How can I set the datetime correctly?

rlkoshak · January 12, 2025, 4:34pm

You are mixing and matching java.time.ZonedDateTime and the JS native joda-js ZonedsDateTime.

You should stick to the JS native. When interacting with the API provided by openhab-js a JS ZDT is always expected.

test = items.getItem('test');

test.sendCommand(-16)
test.persistence.persist(time.toZDT('2025-01-01T12:00'), '-10', 'jdbc')
test.persistence.persist(time.toZDT(), '-15', 'jdbc')

The other two are stored as epoch I think which is a correct date time, It’s just not formatted nicely. The last line represents January 11, 2025 5:30:14.191 PM GMT and the middle line represents Wednesday, January 1, 2025 11:00:00 AM GMT.

I don’t know why it’s different between the built in persistence and using the .persist command but all the entries have a correct timestamp, just in two different formats.

chaoshome · January 12, 2025, 5:25pm

Unfortunately even if they are valid timestamps, openhab can’t properly deal with them. I run this script for a new item (which is configured for jdbc persistence):

test = items.getItem('testPersistence');

test.persistence.persist(time.toZDT().minusMinutes(2), '1', 'jdbc')
test.persistence.persist(time.toZDT().minusMinutes(1), '2', 'jdbc')
test.persistence.persist(time.toZDT(), '3', 'jdbc')
test.sendCommand(4)

Then I tried to make a chart with the analyzer:

So the timestamp seems to be interpreted as a very old value.