Find an Object State
Find an object state at a given time in Python.

Step 1. Connect to a database

Connect to an existing database with multiple commit activities.

Code: Connect to an existing database

import os
import time
import datetime
from terminusdb_client import WOQLClient
from terminusdb_client import WOQLQuery as WOQL
server_url = "http://127.0.0.1:6363"
db = "seshat"
user = "admin"
account = "admin"
key = "root"
client = WOQLClient(server_url)
client.connect(user=user, account=account, key=key, db=db)

Step 2. Get the initial commit

Get the timestamp of the last commit before the date specified in date_string, using the timetuple() method.

Code: Get the timestamp of a commit

date_string = "14/10/2020"
timestamp = time.mktime(datetime.datetime.strptime(date_string, "%d/%m/%Y").timetuple())

Step 3. Get the subsequent commit

Get the next commit after the timestamp retrieved in step 2 and store commit data in commit_query.

Code: Get the details of the subsequent commit

commit_query = WOQL().using("admin/seshat/local/_commits",
WOQL().limit(1,
WOQL.woql_and(
WOQL().triple("v:Branch", "ref:branch_name", "v2"),
WOQL().triple("v:Branch", "ref:ref_commit", " v:Head"),
WOQL().path("v:Head", "ref:commit_parent+", "v:Tail", "v:Path"),
WOQL().triple("v:Tail", "ref:commit_id", "v:TailID"),
WOQL().triple("v:Tail", "ref:commit_timestamp", "v:TimeStamp"),
WOQL().greater(timestamp, "v:TimeStamp"),
)))

Step 4. Get the commit identifier

Get the commit identifier into variable commit_id after running the commit_query defined in step 3.

Code: Get the commit id

results = client.query(commit_query)
commit_id = results['bindings'][0]['TailID']['@value']

Step 5. Get the commit object state

Get the commit object associated with the commit_id obtained in step 4. Note the full path of the commit_id.

Code: Get the commit object state

path = f"admin/seshat/local/commit/{commit_id}"
object_query = WOQL().using(path,
WOQL().read_object("terminusdb:///data/afghazn", "v:Document"))
results = client.query(object_query)
print(results)
Export as PDF
Copy link
On this page
Step 1. Connect to a database
Step 2. Get the initial commit
Step 3. Get the subsequent commit
Step 4. Get the commit identifier
Step 5. Get the commit object state