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db_operations.py
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db_operations.py
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import pymongo
import certifi
import pandas as pd
class MongoDBManagement:
def __init__(self, username, password):
try:
self.username = username
self.password = password
self.uri = f"mongodb+srv://{self.username}:{self.password}@cluster0.99jtb.mongodb.net/myFirstDatabase?retryWrites=true&w=majority"
except Exception as e:
raise Exception("__init__: Something went wrong on initiation process\n" + str(e))
def get_mongodb_clientobj(self):
try:
mongo_client = pymongo.MongoClient(self.uri, tlsCAFile=certifi.where())
return mongo_client
except Exception as e:
raise Exception("get_mongodb_clientobj: Something went wrong on creation of client object\n" + str(e))
'''
#closing mongo_db connection explicitly is not required as it is handled by MongoClient() for auto connection
def close_mongodb_connection(self, mongo_client):
try:
mongo_client.close()
except Exception as e:
raise Exception("close_mongodb_connection: Something went wrong on closing connection\n" + str(e))
'''
def is_database_present(self, db_name):
try:
mongo_client = self.get_mongodb_clientobj()
if db_name in mongo_client.list_database_names():
return True
else:
return False
except Exception as e:
raise Exception("is_database_present: Failed to check database existence \n" + str(e))
def fetch_database(self, db_name):
try:
mongo_client = self.get_mongodb_clientobj()
database = mongo_client[db_name]
return database
except Exception as e:
raise Exception(f"fetch_database: Failed on creating database\n" + str(e))
def drop_database(self, db_name):
try:
mongo_client = self.get_mongodb_clientobj()
if db_name in mongo_client.list_database_names():
mongo_client.drop_database(db_name)
return True
else:
return False
except Exception as e:
raise Exception(f"drop_database: Failed to delete database {db_name}\n" + str(e))
def fetch_collection(self, collection_name, db_name):
try:
database = self.fetch_database(db_name)
return database[collection_name]
except Exception as e:
raise Exception(f"fetch_collection: Failed to get the database list.")
def is_collection_present(self, collection_name, db_name):
try:
database = self.fetch_database(db_name=db_name)
if collection_name in database.list_collection_names():
return True
else:
return False
except Exception as e:
raise Exception(f"is_collection_present: Failed to check collection\n" + str(e))
def drop_collection(self, collection_name, db_name):
try:
database = self.fetch_database(db_name)
if collection_name in database.list_collection_names():
database[collection_name].drop()
return True
else:
return False
except Exception as e:
raise Exception(f"drop_collection: Failed to drop collection {collection_name}")
def insert_record(self, collection_name, db_name, record):
try:
return self.fetch_collection(collection_name, db_name).insert_one(record)
except Exception as e:
raise Exception("insert_record: Error inserting record")
def insert_records(self, collection_name, db_name, records):
try:
return self.fetch_collection(collection_name, db_name).insert_many(records)
except Exception as e:
raise Exception("insert_records: Error inserting records")
def find_record(self, collection_name, db_name):
try:
return self.fetch_collection(collection_name, db_name).find_one()
except Exception as e:
raise Exception("find_record: Error in fetching first record")
def find_records(self, collection_name, db_name, query=None):
try:
if query is not None:
return self.fetch_collection(collection_name, db_name).find(query)
else:
return self.fetch_collection(collection_name, db_name).find()
except Exception as e:
raise Exception("find_records: Error in fetching records with provided query")
def update_one_record(self, collection_name, db_name, filter=None, new_value=None):
try:
return self.fetch_collection(collection_name, db_name).update_one(filter,new_value)
except Exception as e:
raise Exception("update_one_record: Error in updating record with provided filter")
def update_records(self, collection_name, db_name, filter=None, new_value=None):
try:
return self.fetch_collection(collection_name, db_name).update(filter,new_value)
except Exception as e:
raise Exception("update_records: Error in updating records with provided filter")
def delete_record(self, collection_name, db_name, query=None):
try:
if query is not None:
return self.fetch_collection(collection_name, db_name).delete_one(query)
else:
return self.fetch_collection(collection_name, db_name).delete_one({})
except Exception as e:
raise Exception("delete_record: Error in deleting record with provided query")
def delete_records(self, collection_name, db_name, query=None):
try:
if query is not None:
return self.fetch_collection(collection_name, db_name).delete_many(query)
else:
return self.fetch_collection(collection_name, db_name).delete_many({})
except Exception as e:
raise Exception("delete_records: Error in deleting records with provided query")
def collection_to_dataframe(self, collection_name, db_name):
try:
df = pd.Dataframe(self.find_records(collection_name, db_name))
return df
except Exception as e:
raise Exception(f"collection_to_dataframe: Failed to get DatFrame from provided collection and database.\n" + str(e))
def dataframe_to_collection(self, collection_name, db_name, df):
try:
records = df.to_dict(orient='records')
return self.insert_records(collection_name, db_name, records)
except Exception as e:
raise Exception(f"collection_to_dataframe: Failed to get DatFrame from provided collection and database.\n" + str(e))