MongoDB with Python - Basics IV - Update & Delete Operation

Welcome to one more quick session on MongoDB CRUD Basics with Update and Delete Operations. MDB Provides below methods under these operations -

** Update
      * update_one
      * update_many
      * replace_one

** Delete
      * delete_one
      * delete_many

For on Mongo DB -> Link

As it is quite clear from the name itself (_one and _many) that these methods perform the operation on single or multiple records based on the passed condition.
There are so many operator supported by update statement, few are as below -

$set - Add new or update field value
$unset  - Remove field
$inc - increment the current value
$push - push element into array field
$push with $each - push multiple elements into array field
$pop - pull out last value from array field

There are many more Update operators support by MongoDB, Full list can be found HERE


CRUD Operation - (Update & Delete) : Link

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MongoDB with Python - Basics III - Find/Select Operation

Hoping you guys are enjoying the NoSql journey so far (previous posts links), till now we have seen basic CRUD operation. From this post onward, I am diving in details of these operations and starting with FIND or SELECT operation in MongoDB. We will learn what are the ways and options provided by MongoDB to select or project the data.

When you start working with complex queries you might {as I have said "Might"} face difficulties with tracking of braces {([ as I've experienced the same with me/my team/students and colleagues. But no worries, Jupyter Notebook provides a  couple highlighter for braces when selected or you can use notepad++ also (which I think is not so useful as you are not gonna copy/paste the syntax so frequently).

I advise everyone to avoid the writing queries directly on mongo shell prompt as it doesn't provide any intelligence and not so good in fixing queries if made mistake.

I am sure you will love this post as well and if have any question feel free to ask in comment section below.

For on Mongo DB -> Link

There are many more Find/Read Operators supported by MongoDB, Full list can be found HERE

CRUD Operation - (Read) : Link




Next Post on this Series and more on MongoDB can be find here -> LINK

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MongoDB with Python - Basics II - CRUD Operations

In this post, we will learn about the Advance Find and Create Operations with Sort, Skip and Limit functionality. Pymongo driver support almost same kind of syntax for python which mongo shell used.
The benefit of python (or any programming language) + mongo is to use both langauge/db functionality to work with mongo. Though, to perform the same operation is faster then performing by python but it depends on the activity you are performing.

CRUD Operation - (Create, Read, Update & Delete) : Link




Next Post on this Series and more on MongoDB can be find here -> LINK

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MongoDB with Python - Basics I - CRUD Operations

In Previous few posts (Link), We have learnt about MongoDB Cloud Setup, Installation and Basic commands to do CRUD operation with MongoDB. It can be accessed by programming language such as python, java, and node.js by using respective native drivers. We will start with PyMongo (python driver) to access mongo from python.

CRUD Operation - (Create, Read, Update & Delete) : Link




Next Post on this Series and more on MongoDB can be find here -> LINK

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R Points #1 - Matrix & Factor Basics

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R Points #0 - Basics n Vector

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Python - Get line no with print statement

Sometime when we are working on some code and there are lot of print statement, It's difficult to check for which print statement produce this statement.

It helps a lot while debugging the code and helped me to create better python learning script which will generate the output with the code line no which is easy to relate.

Code:

from inspect import currentframe

def lno():
    cf = currentframe()
    val = str(cf.f_back.f_lineno)+". "
    return val

print "this is Me", lno()
print lno(), "Hi! there"

Output:

this is Me  8.

9.  Hi! there

** This is a little overhead on the code as with each print statement the function is being called. So use it wisely :-)

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