Update Collection – Цуглуулга шинэчлэх #
You can update a record, or document as it is called in MongoDB, by using the update_one() method.
The first parameter of the update_one() method is a query object defining which document to update.
Note: If the query finds more than one record, only the first occurrence is updated.
The second parameter is an object defining the new values of the document.
Example – Жишээ #
Change the address from “Valley 345” to “Canyon 123”:
“Valley 345” гэсэн хаягийг “Canyon 123” болгож шинэчлэх:
import pymongo
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["mydatabase"]
mycol = mydb["customers"]
myquery = { "address": "Valley 345" }
newvalues = { "$set": { "address": "Canyon 123" } }
mycol.update_one(myquery, newvalues)
#print "customers" after the update:
for x in mycol.find():
print(x)
Update Many – Олныг шинэчлэх #
To update all documents that meets the criteria of the query, use the update_many() method.
Note: If the query finds more than one record, only the first occurrence is updated.
Тэмдэглэл: Хэрэв асуулгын дагуу нэгээс олон бүртгэл олдвол зөвхөн эхний тохиолдлыг шинэчилнэ.
The second parameter is an object defining the new values of the document.
Example – Жишээ #
Update all documents where the address starts with the letter “S”:
Хаяг дах бүх “S”-ээр эхэлсэн үгсийг шинэчлэх:
import pymongo
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["mydatabase"]
mycol = mydb["customers"]
myquery = { "address": { "$regex": "^S" } }
newvalues = { "$set": { "name": "Minnie" } }
x = mycol.update_many(myquery, newvalues)
print(x.modified_count, "documents updated.")
