Python MongoDB Update
Update Collection
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
Change the address from "Valley 345" to "Canyon 123":
import pymongo
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["mydatabase"]
mycol = mydb["customers"]
myquery = { "address": "Valley 345" }
newvalues = { "$set": {
"address": "Canyon 123" } }
mycol.update_one(myquery, newvalues)
#print "customers" after the update:
for x in mycol.find():
print(x)
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Update Many
To update all documents that meets the criteria of the query, use
the update_many() method.
Example
Update all documents were the address starts with the letter "S":
import pymongo
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["mydatabase"]
mycol = mydb["customers"]
myquery = { "address": { "$regex": "^S" } }
newvalues = { "$set": {
"name": "Minnie" } }
x = mycol.update_many(myquery, newvalues)
print(x.modified_count, "documents updated.")
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