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test_examples.py
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1118 lines (933 loc) · 37.6 KB
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# Copyright 2017 MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""MongoDB documentation examples in Python."""
import threading
import sys
sys.path[0:0] = [""]
import pymongo
from pymongo.errors import ConnectionFailure, OperationFailure
from pymongo.read_concern import ReadConcern
from pymongo.write_concern import WriteConcern
from test import client_context, unittest, IntegrationTest
from test.utils import rs_or_single_client
class TestSampleShellCommands(unittest.TestCase):
@classmethod
@client_context.require_connection
def setUpClass(cls):
cls.client = rs_or_single_client(w="majority")
# Run once before any tests run.
cls.client.pymongo_test.inventory.drop()
@classmethod
def tearDownClass(cls):
client_context.client.drop_database("pymongo_test")
def tearDown(self):
# Run after every test.
self.client.pymongo_test.inventory.drop()
def test_first_three_examples(self):
db = client_context.client.pymongo_test
# Start Example 1
db.inventory.insert_one(
{"item": "canvas",
"qty": 100,
"tags": ["cotton"],
"size": {"h": 28, "w": 35.5, "uom": "cm"}})
# End Example 1
self.assertEqual(db.inventory.count_documents({}), 1)
# Start Example 2
cursor = db.inventory.find({"item": "canvas"})
# End Example 2
self.assertEqual(cursor.count(), 1)
# Start Example 3
db.inventory.insert_many([
{"item": "journal",
"qty": 25,
"tags": ["blank", "red"],
"size": {"h": 14, "w": 21, "uom": "cm"}},
{"item": "mat",
"qty": 85,
"tags": ["gray"],
"size": {"h": 27.9, "w": 35.5, "uom": "cm"}},
{"item": "mousepad",
"qty": 25,
"tags": ["gel", "blue"],
"size": {"h": 19, "w": 22.85, "uom": "cm"}}])
# End Example 3
self.assertEqual(db.inventory.count_documents({}), 4)
def test_query_top_level_fields(self):
db = client_context.client.pymongo_test
# Start Example 6
db.inventory.insert_many([
{"item": "journal",
"qty": 25,
"size": {"h": 14, "w": 21, "uom": "cm"},
"status": "A"},
{"item": "notebook",
"qty": 50,
"size": {"h": 8.5, "w": 11, "uom": "in"},
"status": "A"},
{"item": "paper",
"qty": 100,
"size": {"h": 8.5, "w": 11, "uom": "in"},
"status": "D"},
{"item": "planner",
"qty": 75, "size": {"h": 22.85, "w": 30, "uom": "cm"},
"status": "D"},
{"item": "postcard",
"qty": 45,
"size": {"h": 10, "w": 15.25, "uom": "cm"},
"status": "A"}])
# End Example 6
self.assertEqual(db.inventory.count_documents({}), 5)
# Start Example 7
cursor = db.inventory.find({})
# End Example 7
self.assertEqual(len(list(cursor)), 5)
# Start Example 9
cursor = db.inventory.find({"status": "D"})
# End Example 9
self.assertEqual(len(list(cursor)), 2)
# Start Example 10
cursor = db.inventory.find({"status": {"$in": ["A", "D"]}})
# End Example 10
self.assertEqual(len(list(cursor)), 5)
# Start Example 11
cursor = db.inventory.find({"status": "A", "qty": {"$lt": 30}})
# End Example 11
self.assertEqual(len(list(cursor)), 1)
# Start Example 12
cursor = db.inventory.find(
{"$or": [{"status": "A"}, {"qty": {"$lt": 30}}]})
# End Example 12
self.assertEqual(len(list(cursor)), 3)
# Start Example 13
cursor = db.inventory.find({
"status": "A",
"$or": [{"qty": {"$lt": 30}}, {"item": {"$regex": "^p"}}]})
# End Example 13
self.assertEqual(len(list(cursor)), 2)
def test_query_embedded_documents(self):
db = client_context.client.pymongo_test
# Start Example 14
# Subdocument key order matters in a few of these examples so we have
# to use bson.son.SON instead of a Python dict.
from bson.son import SON
db.inventory.insert_many([
{"item": "journal",
"qty": 25,
"size": SON([("h", 14), ("w", 21), ("uom", "cm")]),
"status": "A"},
{"item": "notebook",
"qty": 50,
"size": SON([("h", 8.5), ("w", 11), ("uom", "in")]),
"status": "A"},
{"item": "paper",
"qty": 100,
"size": SON([("h", 8.5), ("w", 11), ("uom", "in")]),
"status": "D"},
{"item": "planner",
"qty": 75,
"size": SON([("h", 22.85), ("w", 30), ("uom", "cm")]),
"status": "D"},
{"item": "postcard",
"qty": 45,
"size": SON([("h", 10), ("w", 15.25), ("uom", "cm")]),
"status": "A"}])
# End Example 14
# Start Example 15
cursor = db.inventory.find(
{"size": SON([("h", 14), ("w", 21), ("uom", "cm")])})
# End Example 15
self.assertEqual(len(list(cursor)), 1)
# Start Example 16
cursor = db.inventory.find(
{"size": SON([("w", 21), ("h", 14), ("uom", "cm")])})
# End Example 16
self.assertEqual(len(list(cursor)), 0)
# Start Example 17
cursor = db.inventory.find({"size.uom": "in"})
# End Example 17
self.assertEqual(len(list(cursor)), 2)
# Start Example 18
cursor = db.inventory.find({"size.h": {"$lt": 15}})
# End Example 18
self.assertEqual(len(list(cursor)), 4)
# Start Example 19
cursor = db.inventory.find(
{"size.h": {"$lt": 15}, "size.uom": "in", "status": "D"})
# End Example 19
self.assertEqual(len(list(cursor)), 1)
def test_query_arrays(self):
db = client_context.client.pymongo_test
# Start Example 20
db.inventory.insert_many([
{"item": "journal",
"qty": 25,
"tags": ["blank", "red"],
"dim_cm": [14, 21]},
{"item": "notebook",
"qty": 50,
"tags": ["red", "blank"],
"dim_cm": [14, 21]},
{"item": "paper",
"qty": 100,
"tags": ["red", "blank", "plain"],
"dim_cm": [14, 21]},
{"item": "planner",
"qty": 75,
"tags": ["blank", "red"],
"dim_cm": [22.85, 30]},
{"item": "postcard",
"qty": 45,
"tags": ["blue"],
"dim_cm": [10, 15.25]}])
# End Example 20
# Start Example 21
cursor = db.inventory.find({"tags": ["red", "blank"]})
# End Example 21
self.assertEqual(len(list(cursor)), 1)
# Start Example 22
cursor = db.inventory.find({"tags": {"$all": ["red", "blank"]}})
# End Example 22
self.assertEqual(len(list(cursor)), 4)
# Start Example 23
cursor = db.inventory.find({"tags": "red"})
# End Example 23
self.assertEqual(len(list(cursor)), 4)
# Start Example 24
cursor = db.inventory.find({"dim_cm": {"$gt": 25}})
# End Example 24
self.assertEqual(len(list(cursor)), 1)
# Start Example 25
cursor = db.inventory.find({"dim_cm": {"$gt": 15, "$lt": 20}})
# End Example 25
self.assertEqual(len(list(cursor)), 4)
# Start Example 26
cursor = db.inventory.find(
{"dim_cm": {"$elemMatch": {"$gt": 22, "$lt": 30}}})
# End Example 26
self.assertEqual(len(list(cursor)), 1)
# Start Example 27
cursor = db.inventory.find({"dim_cm.1": {"$gt": 25}})
# End Example 27
self.assertEqual(len(list(cursor)), 1)
# Start Example 28
cursor = db.inventory.find({"tags": {"$size": 3}})
# End Example 28
self.assertEqual(len(list(cursor)), 1)
def test_query_array_of_documents(self):
db = client_context.client.pymongo_test
# Start Example 29
# Subdocument key order matters in a few of these examples so we have
# to use bson.son.SON instead of a Python dict.
from bson.son import SON
db.inventory.insert_many([
{"item": "journal",
"instock": [
SON([("warehouse", "A"), ("qty", 5)]),
SON([("warehouse", "C"), ("qty", 15)])]},
{"item": "notebook",
"instock": [
SON([("warehouse", "C"), ("qty", 5)])]},
{"item": "paper",
"instock": [
SON([("warehouse", "A"), ("qty", 60)]),
SON([("warehouse", "B"), ("qty", 15)])]},
{"item": "planner",
"instock": [
SON([("warehouse", "A"), ("qty", 40)]),
SON([("warehouse", "B"), ("qty", 5)])]},
{"item": "postcard",
"instock": [
SON([("warehouse", "B"), ("qty", 15)]),
SON([("warehouse", "C"), ("qty", 35)])]}])
# End Example 29
# Start Example 30
cursor = db.inventory.find(
{"instock": SON([("warehouse", "A"), ("qty", 5)])})
# End Example 30
self.assertEqual(len(list(cursor)), 1)
# Start Example 31
cursor = db.inventory.find(
{"instock": SON([("qty", 5), ("warehouse", "A")])})
# End Example 31
self.assertEqual(len(list(cursor)), 0)
# Start Example 32
cursor = db.inventory.find({'instock.0.qty': {"$lte": 20}})
# End Example 32
self.assertEqual(len(list(cursor)), 3)
# Start Example 33
cursor = db.inventory.find({'instock.qty': {"$lte": 20}})
# End Example 33
self.assertEqual(len(list(cursor)), 5)
# Start Example 34
cursor = db.inventory.find(
{"instock": {"$elemMatch": {"qty": 5, "warehouse": "A"}}})
# End Example 34
self.assertEqual(len(list(cursor)), 1)
# Start Example 35
cursor = db.inventory.find(
{"instock": {"$elemMatch": {"qty": {"$gt": 10, "$lte": 20}}}})
# End Example 35
self.assertEqual(len(list(cursor)), 3)
# Start Example 36
cursor = db.inventory.find({"instock.qty": {"$gt": 10, "$lte": 20}})
# End Example 36
self.assertEqual(len(list(cursor)), 4)
# Start Example 37
cursor = db.inventory.find(
{"instock.qty": 5, "instock.warehouse": "A"})
# End Example 37
self.assertEqual(len(list(cursor)), 2)
def test_query_null(self):
db = client_context.client.pymongo_test
# Start Example 38
db.inventory.insert_many([{"_id": 1, "item": None}, {"_id": 2}])
# End Example 38
# Start Example 39
cursor = db.inventory.find({"item": None})
# End Example 39
self.assertEqual(len(list(cursor)), 2)
# Start Example 40
cursor = db.inventory.find({"item": {"$type": 10}})
# End Example 40
self.assertEqual(len(list(cursor)), 1)
# Start Example 41
cursor = db.inventory.find({"item": {"$exists": False}})
# End Example 41
self.assertEqual(len(list(cursor)), 1)
def test_projection(self):
db = client_context.client.pymongo_test
# Start Example 42
db.inventory.insert_many([
{"item": "journal",
"status": "A",
"size": {"h": 14, "w": 21, "uom": "cm"},
"instock": [{"warehouse": "A", "qty": 5}]},
{"item": "notebook",
"status": "A",
"size": {"h": 8.5, "w": 11, "uom": "in"},
"instock": [{"warehouse": "C", "qty": 5}]},
{"item": "paper",
"status": "D",
"size": {"h": 8.5, "w": 11, "uom": "in"},
"instock": [{"warehouse": "A", "qty": 60}]},
{"item": "planner",
"status": "D",
"size": {"h": 22.85, "w": 30, "uom": "cm"},
"instock": [{"warehouse": "A", "qty": 40}]},
{"item": "postcard",
"status": "A",
"size": {"h": 10, "w": 15.25, "uom": "cm"},
"instock": [
{"warehouse": "B", "qty": 15},
{"warehouse": "C", "qty": 35}]}])
# End Example 42
# Start Example 43
cursor = db.inventory.find({"status": "A"})
# End Example 43
self.assertEqual(len(list(cursor)), 3)
# Start Example 44
cursor = db.inventory.find(
{"status": "A"}, {"item": 1, "status": 1})
# End Example 44
for doc in cursor:
self.assertTrue("_id" in doc)
self.assertTrue("item" in doc)
self.assertTrue("status" in doc)
self.assertFalse("size" in doc)
self.assertFalse("instock" in doc)
# Start Example 45
cursor = db.inventory.find(
{"status": "A"}, {"item": 1, "status": 1, "_id": 0})
# End Example 45
for doc in cursor:
self.assertFalse("_id" in doc)
self.assertTrue("item" in doc)
self.assertTrue("status" in doc)
self.assertFalse("size" in doc)
self.assertFalse("instock" in doc)
# Start Example 46
cursor = db.inventory.find(
{"status": "A"}, {"status": 0, "instock": 0})
# End Example 46
for doc in cursor:
self.assertTrue("_id" in doc)
self.assertTrue("item" in doc)
self.assertFalse("status" in doc)
self.assertTrue("size" in doc)
self.assertFalse("instock" in doc)
# Start Example 47
cursor = db.inventory.find(
{"status": "A"}, {"item": 1, "status": 1, "size.uom": 1})
# End Example 47
for doc in cursor:
self.assertTrue("_id" in doc)
self.assertTrue("item" in doc)
self.assertTrue("status" in doc)
self.assertTrue("size" in doc)
self.assertFalse("instock" in doc)
size = doc['size']
self.assertTrue('uom' in size)
self.assertFalse('h' in size)
self.assertFalse('w' in size)
# Start Example 48
cursor = db.inventory.find({"status": "A"}, {"size.uom": 0})
# End Example 48
for doc in cursor:
self.assertTrue("_id" in doc)
self.assertTrue("item" in doc)
self.assertTrue("status" in doc)
self.assertTrue("size" in doc)
self.assertTrue("instock" in doc)
size = doc['size']
self.assertFalse('uom' in size)
self.assertTrue('h' in size)
self.assertTrue('w' in size)
# Start Example 49
cursor = db.inventory.find(
{"status": "A"}, {"item": 1, "status": 1, "instock.qty": 1})
# End Example 49
for doc in cursor:
self.assertTrue("_id" in doc)
self.assertTrue("item" in doc)
self.assertTrue("status" in doc)
self.assertFalse("size" in doc)
self.assertTrue("instock" in doc)
for subdoc in doc['instock']:
self.assertFalse('warehouse' in subdoc)
self.assertTrue('qty' in subdoc)
# Start Example 50
cursor = db.inventory.find(
{"status": "A"},
{"item": 1, "status": 1, "instock": {"$slice": -1}})
# End Example 50
for doc in cursor:
self.assertTrue("_id" in doc)
self.assertTrue("item" in doc)
self.assertTrue("status" in doc)
self.assertFalse("size" in doc)
self.assertTrue("instock" in doc)
self.assertEqual(len(doc["instock"]), 1)
def test_update_and_replace(self):
db = client_context.client.pymongo_test
# Start Example 51
db.inventory.insert_many([
{"item": "canvas",
"qty": 100,
"size": {"h": 28, "w": 35.5, "uom": "cm"},
"status": "A"},
{"item": "journal",
"qty": 25,
"size": {"h": 14, "w": 21, "uom": "cm"},
"status": "A"},
{"item": "mat",
"qty": 85,
"size": {"h": 27.9, "w": 35.5, "uom": "cm"},
"status": "A"},
{"item": "mousepad",
"qty": 25,
"size": {"h": 19, "w": 22.85, "uom": "cm"},
"status": "P"},
{"item": "notebook",
"qty": 50,
"size": {"h": 8.5, "w": 11, "uom": "in"},
"status": "P"},
{"item": "paper",
"qty": 100,
"size": {"h": 8.5, "w": 11, "uom": "in"},
"status": "D"},
{"item": "planner",
"qty": 75,
"size": {"h": 22.85, "w": 30, "uom": "cm"},
"status": "D"},
{"item": "postcard",
"qty": 45,
"size": {"h": 10, "w": 15.25, "uom": "cm"},
"status": "A"},
{"item": "sketchbook",
"qty": 80,
"size": {"h": 14, "w": 21, "uom": "cm"},
"status": "A"},
{"item": "sketch pad",
"qty": 95,
"size": {"h": 22.85, "w": 30.5, "uom": "cm"},
"status": "A"}])
# End Example 51
# Start Example 52
db.inventory.update_one(
{"item": "paper"},
{"$set": {"size.uom": "cm", "status": "P"},
"$currentDate": {"lastModified": True}})
# End Example 52
for doc in db.inventory.find({"item": "paper"}):
self.assertEqual(doc["size"]["uom"], "cm")
self.assertEqual(doc["status"], "P")
self.assertTrue("lastModified" in doc)
# Start Example 53
db.inventory.update_many(
{"qty": {"$lt": 50}},
{"$set": {"size.uom": "in", "status": "P"},
"$currentDate": {"lastModified": True}})
# End Example 53
for doc in db.inventory.find({"qty": {"$lt": 50}}):
self.assertEqual(doc["size"]["uom"], "in")
self.assertEqual(doc["status"], "P")
self.assertTrue("lastModified" in doc)
# Start Example 54
db.inventory.replace_one(
{"item": "paper"},
{"item": "paper",
"instock": [
{"warehouse": "A", "qty": 60},
{"warehouse": "B", "qty": 40}]})
# End Example 54
for doc in db.inventory.find({"item": "paper"}, {"_id": 0}):
self.assertEqual(len(doc.keys()), 2)
self.assertTrue("item" in doc)
self.assertTrue("instock" in doc)
self.assertEqual(len(doc["instock"]), 2)
def test_delete(self):
db = client_context.client.pymongo_test
# Start Example 55
db.inventory.insert_many([
{"item": "journal",
"qty": 25,
"size": {"h": 14, "w": 21, "uom": "cm"},
"status": "A"},
{"item": "notebook",
"qty": 50,
"size": {"h": 8.5, "w": 11, "uom": "in"},
"status": "P"},
{"item": "paper",
"qty": 100,
"size": {"h": 8.5, "w": 11, "uom": "in"},
"status": "D"},
{"item": "planner",
"qty": 75,
"size": {"h": 22.85, "w": 30, "uom": "cm"},
"status": "D"},
{"item": "postcard",
"qty": 45,
"size": {"h": 10, "w": 15.25, "uom": "cm"},
"status": "A"}])
# End Example 55
self.assertEqual(db.inventory.count_documents({}), 5)
# Start Example 57
db.inventory.delete_many({"status": "A"})
# End Example 57
self.assertEqual(db.inventory.count_documents({}), 3)
# Start Example 58
db.inventory.delete_one({"status": "D"})
# End Example 58
self.assertEqual(db.inventory.count_documents({}), 2)
# Start Example 56
db.inventory.delete_many({})
# End Example 56
self.assertEqual(db.inventory.count_documents({}), 0)
@client_context.require_version_min(3, 5, 11)
@client_context.require_replica_set
def test_change_streams(self):
db = client_context.client.pymongo_test
done = False
def insert_docs():
while not done:
db.inventory.insert_one({"username": "alice"})
db.inventory.delete_one({"username": "alice"})
t = threading.Thread(target=insert_docs)
t.start()
try:
# 1. The database for reactive, real-time applications
# Start Changestream Example 1
cursor = db.inventory.watch()
document = next(cursor)
# End Changestream Example 1
# Start Changestream Example 2
cursor = db.inventory.watch(full_document='updateLookup')
document = next(cursor)
# End Changestream Example 2
# Start Changestream Example 3
resume_token = document.get("_id")
cursor = db.inventory.watch(resume_after=resume_token)
document = next(cursor)
# End Changestream Example 3
# Start Changestream Example 4
pipeline = [
{"$match": {
"$or": [
{"fullDocument.username": "alice"},
{"operationType": {"$in": ["delete"]}}]
}
}
]
cursor = db.inventory.watch(pipeline=pipeline)
document = next(cursor)
# End Changestream Example 4
finally:
done = True
t.join()
def test_aggregate_examples(self):
db = client_context.client.pymongo_test
# Start Aggregation Example 1
db.sales.aggregate([
{"$match": {"items.fruit": "banana"}},
{"$sort": {"date": 1}}
])
# End Aggregation Example 1
# Start Aggregation Example 2
db.sales.aggregate([
{"$unwind": "$items"},
{"$match": {"items.fruit": "banana"}},
{"$group": {
"_id": {"day": {"$dayOfWeek": "$date"}},
"count": {"$sum": "$items.quantity"}}
},
{"$project": {
"dayOfWeek": "$_id.day",
"numberSold": "$count",
"_id": 0}
},
{"$sort": {"numberSold": 1}}
])
# End Aggregation Example 2
# Start Aggregation Example 3
db.sales.aggregate([
{"$unwind": "$items"},
{"$group": {
"_id": {"day": {"$dayOfWeek": "$date"}},
"items_sold": {"$sum": "$items.quantity"},
"revenue": {
"$sum": {
"$multiply": [
"$items.quantity", "$items.price"]
}
}
}
},
{"$project": {
"day": "$_id.day",
"revenue": 1,
"items_sold": 1,
"discount": {
"$cond": {
"if": {"$lte": ["$revenue", 250]},
"then": 25,
"else": 0
}
}
}
}
])
# End Aggregation Example 3
# $lookup was new in 3.2. The let and pipeline options
# were added in 3.6.
if client_context.version.at_least(3, 6, 0):
# Start Aggregation Example 4
db.air_alliances.aggregate([
{"$lookup": {
"from": "air_airlines",
"let": {"constituents": "$airlines"},
"pipeline": [
{"$match": {"$expr": {"$in": ["$name", "$$constituents"]}}}
],
"as": "airlines"
}
},
{"$project": {
"_id": 0,
"name": 1,
"airlines": {
"$filter": {
"input": "$airlines",
"as": "airline",
"cond": {"$eq": ["$$airline.country", "Canada"]}
}
}
}
}
])
# End Aggregation Example 4
def test_commands(self):
db = client_context.client.pymongo_test
db.restaurants.insert_one({})
# Start runCommand Example 1
db.command("buildInfo")
# End runCommand Example 1
# Start runCommand Example 2
db.command("collStats", "restaurants")
# End runCommand Example 2
def test_index_management(self):
db = client_context.client.pymongo_test
# Start Index Example 1
db.records.create_index("score")
# End Index Example 1
# Start Index Example 1
db.restaurants.create_index(
[("cuisine", pymongo.ASCENDING), ("name", pymongo.ASCENDING)],
partialFilterExpression={"rating": {"$gt": 5}}
)
# End Index Example 1
@client_context.require_version_min(3, 6, 0)
@client_context.require_replica_set
def test_misc(self):
# Marketing examples
client = client_context.client
self.addCleanup(client.drop_database, "test")
self.addCleanup(client.drop_database, "my_database")
# 2. Tunable consistency controls
collection = client.my_database.my_collection
with client.start_session() as session:
collection.insert_one({'_id': 1}, session=session)
collection.update_one(
{'_id': 1}, {"$set": {"a": 1}}, session=session)
for doc in collection.find({}, session=session):
pass
# 3. Exploiting the power of arrays
collection = client.test.array_updates_test
collection.update_one(
{'_id': 1},
{"$set": {"a.$[i].b": 2}},
array_filters=[{"i.b": 0}])
class TestTransactionExamples(IntegrationTest):
@classmethod
@client_context.require_connection
def setUpClass(cls):
super(TestTransactionExamples, cls).setUpClass()
cls.client = rs_or_single_client(w="majority")
@client_context.require_transactions
def test_transactions(self):
# Transaction examples
client = self.client
self.addCleanup(client.drop_database, "hr")
self.addCleanup(client.drop_database, "reporting")
employees = client.hr.employees
events = client.reporting.events
employees.insert_one({"employee": 3, "status": "Active"})
events.insert_one(
{"employee": 3, "status": {"new": "Active", "old": None}})
# Start Transactions Intro Example 1
def update_employee_info(session):
employees_coll = session.client.hr.employees
events_coll = session.client.reporting.events
with session.start_transaction(
read_concern=ReadConcern("snapshot"),
write_concern=WriteConcern(w="majority")):
employees_coll.update_one(
{"employee": 3}, {"$set": {"status": "Inactive"}},
session=session)
events_coll.insert_one(
{"employee": 3, "status": {
"new": "Inactive", "old": "Active"}},
session=session)
while True:
try:
# Commit uses write concern set at transaction start.
session.commit_transaction()
print("Transaction committed.")
break
except (ConnectionFailure, OperationFailure) as exc:
# Can retry commit
if exc.has_error_label(
"UnknownTransactionCommitResult"):
print("UnknownTransactionCommitResult, retrying "
"commit operation ...")
continue
else:
print("Error during commit ...")
raise
# End Transactions Intro Example 1
with client.start_session() as session:
update_employee_info(session)
employee = employees.find_one({"employee": 3})
self.assertIsNotNone(employee)
self.assertEqual(employee['status'], 'Inactive')
# Start Transactions Retry Example 1
def run_transaction_with_retry(txn_func, session):
while True:
try:
txn_func(session) # performs transaction
break
except (ConnectionFailure, OperationFailure) as exc:
print("Transaction aborted. Caught exception during "
"transaction.")
# If transient error, retry the whole transaction
if exc.has_error_label("TransientTransactionError"):
print("TransientTransactionError, retrying"
"transaction ...")
continue
else:
raise
# End Transactions Retry Example 1
with client.start_session() as session:
run_transaction_with_retry(update_employee_info, session)
employee = employees.find_one({"employee": 3})
self.assertIsNotNone(employee)
self.assertEqual(employee['status'], 'Inactive')
# Start Transactions Retry Example 2
def commit_with_retry(session):
while True:
try:
# Commit uses write concern set at transaction start.
session.commit_transaction()
print("Transaction committed.")
break
except (ConnectionFailure, OperationFailure) as exc:
# Can retry commit
if exc.has_error_label("UnknownTransactionCommitResult"):
print("UnknownTransactionCommitResult, retrying "
"commit operation ...")
continue
else:
print("Error during commit ...")
raise
# End Transactions Retry Example 2
# Test commit_with_retry from the previous examples
def _insert_employee_retry_commit(session):
with session.start_transaction():
employees.insert_one(
{"employee": 4, "status": "Active"},
session=session)
events.insert_one(
{"employee": 4, "status": {"new": "Active", "old": None}},
session=session)
commit_with_retry(session)
with client.start_session() as session:
run_transaction_with_retry(_insert_employee_retry_commit, session)
employee = employees.find_one({"employee": 4})
self.assertIsNotNone(employee)
self.assertEqual(employee['status'], 'Active')
# Start Transactions Retry Example 3
def run_transaction_with_retry(txn_func, session):
while True:
try:
txn_func(session) # performs transaction
break
except (ConnectionFailure, OperationFailure) as exc:
# If transient error, retry the whole transaction
if exc.has_error_label("TransientTransactionError"):
print("TransientTransactionError, retrying "
"transaction ...")
continue
else:
raise
def commit_with_retry(session):
while True:
try:
# Commit uses write concern set at transaction start.
session.commit_transaction()
print("Transaction committed.")
break
except (ConnectionFailure, OperationFailure) as exc:
# Can retry commit
if exc.has_error_label("UnknownTransactionCommitResult"):
print("UnknownTransactionCommitResult, retrying "
"commit operation ...")