This MongoDB Insert lesson is for a beginner. Read the short notes, run each example, then change one name or number and run it again.
insert_one adds one document. insert_many adds a list. MongoDB adds an _id when you do not supply one.
The example appends a document to the stand-in collection.
Example 1: Start here
On a real client the call is collection.insert_one({"name": "Meera", "track": "Python"}).
collection = [] # a list; the values stay in this order
collection.append({"name": "Meera", "track": "Python"}) # add one item at the end of the list
print(collection)
Example 2: Filter the rows
MongoDB Insert is easier to see as a list of records. The filter keeps every row whose seats value is at least 10.
rows = [{"topic": "MongoDB Insert", "seats": 23}, {"topic": "SQL", "seats": 12}] # a list; the values stay in this order
print([row["topic"] for row in rows if row["seats"] >= 10]) # keep the items that pass the test
Example 3: Update one field
An update changes one field and leaves the rest of the record alone. On a database you would run an UPDATE or an update_one for the same change.
row = {"topic": "MongoDB Insert", "seats": 23} # a dictionary; each key has one value
row["seats"] = row["seats"] + 1 # change this one field
print(row)
Example 4: Count the matches
Counting matches is the idea behind COUNT(*). Here the number 23 appears twice.
rows = [23, 4, 23] # a list; the values stay in this order
print(sum(1 for value in rows if value == 23)) # keep the items that pass the test
On a real client the call is collection.insert_one({"name": "Meera", "track": "Python"}).
