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db_connection_mongo.py
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db_connection_mongo.py
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#-------------------------------------------------------------------------
# AUTHOR: Theo Nakfoor
# FILENAME: db_connection_mongo.py
# SPECIFICATION: A simple program to handle creation, update, deletion and index generation commands for a MongoDB database.
# FOR: CS 4250- Assignment #2
# TIME SPENT: 1h
#-----------------------------------------------------------*/
from pymongo import MongoClient # import mongo client to connect
#IMPORTANT NOTE: DO NOT USE ANY ADVANCED PYTHON LIBRARY TO COMPLETE THIS CODE SUCH AS numpy OR pandas. You have to work here only with
# standard arrays
#importing some Python libraries
# --> add your Python code here
def connectDataBase():
client = MongoClient("localhost", 27017)
return client["local"]
def createDocument(col, docId, docText, docTitle, docDate, docCat):
terms = []
docTextCleaned = "".join([ t if (t.isalnum() or t.isspace()) else "" for t in docText])
for term in set(docTextCleaned.lower().split(" ")):
terms.append({
"term": term,
"count": docText.lower().count(term),
"num_chars": len(term)
})
document = {
"_id": docId,
"title": docTitle,
"text": docText,
"num_chars": len(docText),
"date": { "$date": docDate },
"category": docCat,
"terms": terms
}
col.insert_one(document)
def deleteDocument(col, docId):
col.delete_one({ "_id": docId })
def updateDocument(col, docId, docText, docTitle, docDate, docCat):
deleteDocument(col, docId)
createDocument(col, docId, docText, docTitle, docDate, docCat)
def getIndex(col):
cursor = col.aggregate([{ "$unwind": "$terms" }, { "$group": { "_id": "$terms.term", "documents": { "$push": { "$concat": ["$title", ":", { "$toString": "$terms.count"}] } } } }, { "$project": { "_id": 0, "term": "$_id", "documents": 1}}])
return { record["term"]:record["documents"] for record in list(cursor)}