SQLAlchemy Turns Python Objects Into Database Entries

Рет қаралды 154,497

Жыл бұрын

Today we learn about SQLAlchemy, which is an SQL Toolkit and ORM that allows us to map Python classes to database tables.
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Пікірлер: 113

@rogueb1t Жыл бұрын

Ive watched this video sooooo many times! Brilliant tutorial on using SQLAlchemy to abstract SQL from python. I also loved your CLASSES video! Its helped me develop my code so much faster. Cheers dude!"

@kharutyunyan82 Жыл бұрын

One of the best channels in youtube! Thanks for your work!!!

@rpf23543 Жыл бұрын

Very great article. Short, distinct on the point - Thank you!

@dustinrolsander8336 Жыл бұрын

Very clean and easy to understand, thanks for the video. Just a small hint: at 18:51 you couldn't see the table, bc the database windows won't refresh automatically in PyCharm. You have to click the refresh button at the top of the panel (third symbol in ur case). Then it will show the additionally created tables.

@reginaldmaisonneuve7594 4 ай бұрын

Nicely done. Simple and effective example that immediately clarified proper structure.

@stevekruger7807 3 ай бұрын

Thanks! Very clear, easy to follow, learned enough to get me started!

@juliusokwe9524 7 ай бұрын

Clear and informative video. I have just started to learn orm and sqlalchemy and this video is superb. Thanks for sharing.

@andymandrill Жыл бұрын

This has been an awesome tutorial TY, I learned enough to continue my project ! Geatings from colombia !

@ootbinc Жыл бұрын

Great video! I currently create and update SQL rows by calling stored procedures. I want to give SQLAlchemy a try.

@Nithishraj-dr4yr Жыл бұрын

stright to the point..awesome man

@sandhiyasuresh2275 Жыл бұрын

really great session , everything is clear and easy to understand. thank you...

@radio_electronics4047 Жыл бұрын

One of the imports used is deprecated. For SQLAlchemy 2.0.10 the import for the declarative_base needs to look like this: from sqlalchemy.orm import declarative_base

@Melukote_Sriharsha 9 ай бұрын

Thanks

@aleksalukic1904 Жыл бұрын

this video has saved me a lot of time. thanks for your work :*

@Troteos 4 ай бұрын

Another great video. You are such a good teacher, while your style of explaining things seems so effortless.

@benshapiro9731 Жыл бұрын

Hey man solid video, but should add a note that you are, in fact, using the legacy (albeit backward compatible) syntax here. Mapped_column() is now the new factory function for the Column() class

@ThatGuyEster Жыл бұрын

This is a treasure! Thank you so much!

@nujanai Жыл бұрын

Excellent tutorial. Thank you for the content.

@bundesdavid Жыл бұрын

Thank you very much for the help! :^) At 14:00 you could also use results = session.query(Person).filter(Person.lastname == "Smith").all() with the .all() at the end you select every element fitting to the filter!

@joxa6119 9 ай бұрын

Life saver!

@vipulkumar2845 8 күн бұрын

damn, you're tutorials are way too advanced, Lots of love man!!

@Cire-my6ur 4 ай бұрын

1:09 this is exactly what I was looking for. THANK YOU!

@Mustafa-qs2rq Жыл бұрын

This was very well explained.

@michaelnockov2096 4 ай бұрын

Thank you for this video, I was looking for soft introduction to sqlalchemy. Their documentation is quite difficult and their quick start actually don’t show the easiest ways to use it

@sivajyothichandra 25 күн бұрын

In the last query execution it results out the object of respective classes. In the iteration of the loop, print(r) displayed both classes __repr__ method string format

@janHodle 11 ай бұрын

Isn‘t the use of Column legacy? I know this video is 8 months old. I think a better way is to use: first_name: Mapped[str] = mapped_column(String, nullable=True)…. If the information are optional one can use Optional from the typing library

@spanish360 11 ай бұрын

So with this I am now writing data from a PLC to a database to keep records for longer periods of time with out having to hold the data or do the logic inside of the PLC, thanks so much!

@pedromarques5510 11 ай бұрын

hey, i am very curious about your work. i used to work with plcs but only assembly/wiring... i am now studying cs. could u please share your foundations? some key course maybe. thanks in advance. (can be in spanish, gracias)

@pythonwriter8233 Жыл бұрын

Informative thanks!

@toobeeus4648 8 ай бұрын

Thanks. That helped a lot!

@andreasfloter3904 7 ай бұрын

Your video gives a good introduction to SQLalchemy. I would like to make one comment though. As far as I know best practice for table creation is to use singular nouns and not pural names. It would be also easier if the object name and the table name is the same. So in your example it would have been better e.g. to use for class Person __tablename__ = "person".

@alefalfa Жыл бұрын

thanks. fantastic video!

@bakalmode5903 Жыл бұрын

great video keep it up!

@abigaildawson_dev 4 ай бұрын

At 13:55, you can add .all() at the end to return a list of the results, instead of iterating over them and printing: results = session.query(Person).filter(Person.lastname == "Blue").all()

@patinronin2991 10 ай бұрын

Hello, i have the same problem like you, when i add a table the base.metadata.create_all() dosnt create the table, how to solve that ? In a poppulated database is not a option to delete the db, i used alembic but some times dosnt generate the revision file with the changes.

@piotrmazgaj Жыл бұрын

Uuuuu... exactly what I was looking for! Thanks!

@chriskeo392 Жыл бұрын

plenty of these on KZfaq already

@piotrmazgaj Жыл бұрын

@@chriskeo392 not on SQL Alchemy. Not in good english,

@piotrmazgaj Жыл бұрын

@@chriskeo392 not in GOOD english, read carefully please.

@chriskeo392 Жыл бұрын

@@piotrmazgaj I think you need to look up English tutorials instead 🤡

@princescadelpe Жыл бұрын

Can we create an engine if are database user only has Create, Drop, Delete permissions, or does our database user need to have All permissions set up?

@mouhamedtoure2800 11 ай бұрын

How do you configure pycharm and sqlserver to follow this tutotrial?

@nocopyrightgameplaystockvi231 Жыл бұрын

I am thinking of making a similar module for my own project.

@corazondepapel9346 Жыл бұрын

Bruh, I had no idea you could do this with SQLAlchemy. I use SQL a lot and always hated writing qries on Python

@fexofenadinaGenerica Жыл бұрын

There are other alternatives to sqlalchemy too, like the peewee orm which is very nice as well

@chikkivenu6632 8 ай бұрын

Quick Question: How can we have multiple databases made and used? reason for asking is to create the microservice architecture environment.

@mikedurham4448 11 ай бұрын

this alchemy is the dope for us olderfarts trying to createwhile learning something to use -and hopefully rebuild some monstrosity i built in excel way back ..lol.. +

@pkavenger9990 Жыл бұрын

Actually the reason why people call it sequel instead of SQL is because at first it was SEQL Structured English Query Language but then they skiped the E.

@nickmills8476 10 ай бұрын

Nice video! The model constructors are generated automatically by sqlalchemy.

@sinkingboat101 Жыл бұрын

Question: At around 7:00 the variable "firstname" defined inside the class is also defined as a variable in the constructor __init__ method. Usually, a class attribute can be called with self. ... , so is the init method overwriting the column definition or is the self.firstname call non-unique?

@benshapiro9731 Жыл бұрын

In python there is a distinction between and instance attribute and class attribute. The class attribute is in the class’s __dict__ while the instance attr is in the instance’s __dict__. Sql alchemy’s major flaw is that it relies on this approach instead of a more pythonic one

@JLSXMK8 Жыл бұрын

This would also be awesome for teaching/learning SQL. You can tell SQLAlchemy what you want to do, and use the output to learn how to do it in SQL.

@lovemich4237 6 ай бұрын

Thank you man.

@stardustsong1680 Жыл бұрын

Maybe you should use Jupyter notebook to avoid deleting the database every time running the code.

@DimitrisKougioumtzis 7 күн бұрын

very helpull thanks a lot but in the constructor of the object i use def __init__(self,**kwargs): self.__dict__.update((k, v) for k, v in kwargs.items()) when an object contains a lot of attributes

@Somish3 6 ай бұрын

what if I have 5000 entries to insert? Is there any batch way, like a loop to read data from csv and add to the SQL DB or any other less manual way?

@user-cf6pr1zy9m 10 ай бұрын

from sqlalchemy import inspect inspector = inspect(engine) if not inspector.has_table('DB'): Base.metadata.create_all(engine)

@surajpatil8670 4 ай бұрын

Which plugin did you use to directly view .db file in Pycharm?

@NeuralNine 4 ай бұрын

It is a feature of PyCharm. If it does not work for you, maybe it is only available in the Professional edition.

@funy0n583 Жыл бұрын

If anybody is getting a warning saying: "Deprecated API features detected! These feature(s) are not compatible with SQLAlchemy 2.0." you can fix it by changing "from sqlalchemy.ext.declarative import declarative_base" to "from sqlalchemy.orm import declarative_base"

@aswathvanan3833 Жыл бұрын

can you use it with routes

@user-ur1kq6nu1u 11 ай бұрын

Great Help

@machoToni 11 ай бұрын

Nice and simple

@tahmidhossain6349 5 ай бұрын

Well what happens if I want to access a database which already exists

@dmitrykononenko6411 Жыл бұрын

Is it possible to use sqlalchemy for more advanced sql queries? For example, I mean joining, subqueries or CVEs. Also how to do queries on views?

@konjikiyami7301 Жыл бұрын

Yes, you can use SQLAlchemy to perform advanced queries, and you can further customize the Python models, relationships, etc. If you find that the syntax of a query gets challenging in SQLAlchemy (has happened to me a few times), it also provides methods for you to be able to write the raw SQL yourself, and have the engine execute the query. I generally just wrote raw SQL when having to query views, though I admit most of my usecases did not need views, so I never dove too far with them.

@surajprasad118 8 ай бұрын

Brilliant video Thank You Sir :) Can I do the same with an auto increment column ? Thanks

@A.Mercier 8 ай бұрын

I think you just have to add autoincrement attribute when specifying the id column: eg: id = Column(Integer, primary_key=True, autoincrement=True)

@al-edrisy1129 Жыл бұрын

sorry but how did you open the database in pycharm ?

@j.k.notrowling2449 6 ай бұрын

Could you share the code you write in the tutorial?

@codebusters007 Жыл бұрын

This is a really helpful video! Do you use some sort of a plugin to view the database inside PyCharm? :)

@dijla_younis Жыл бұрын

On vs code i use sqlite viewer to view the database

@bakasenpaidesu Жыл бұрын

Need SQLModel tutorial becz itz hard to find... the one already exist doesn't help me at all ...

@MattDlax5 Жыл бұрын

Thank you bro

@sonblue34 Жыл бұрын

In this, you are creating your Engine in one file What am I to do if I have Classes in separate files? I assume I'm not to make multiple Engines for each Class and I'm not entirely sure how I make one engine for everything outside of the scope of the single file. I intend to use the async variation of this and multiple users will be potentially calling things.

@tim.martin Жыл бұрын

Create the engine and session, create functions returning pointers to each (eg, GetEngine()) , save as "db . py". In another file: import db import db engine = db.GetEngine() session = db.GetSession()

@blackdragon5728 4 ай бұрын

UserWarning: pandas only supports SQLAlchemy connectable (engine/connection) or database string URI or sqlite3 DBAPI2 connection. Other DBAPI2 objects are not tested. Please consider using SQLAlchemy. MD_agric_df = pd.read_sql_query(text(sql_query), connection) i got this error guys hope someone help ASAP in my jupyter notebook please

@BathingAfrican Жыл бұрын

could you do a odoo tutorial?

@bradzoltick6465 6 ай бұрын

Thank you.

@powlock1994 Жыл бұрын

Hello, is there any better way to create a table with hundreds of columns, instead of writing them by hands as arguments in the class? Thanks Regards

@robertstanton4694 5 ай бұрын

Where do you have the data containing hundreds of columns currently?

@MichaelDeBusk Жыл бұрын

"Persons" is indeed a valid English word, and would be the more appropriate choice for the database.

@A.Mercier 8 ай бұрын

re-writing __init__ function is useless if you don't implement custom behaviors within it and is only prone to raise errors

@MartinSh429 Жыл бұрын

I work with pycharm for my classes, but never tried to create a database in pycharm. is that something that I have to add to pycharm? I have to use to PgAdmin everysingle time and use postgres

@MartinSh429 Жыл бұрын

figured it out finally!

@bennet5467 9 ай бұрын

good stuff

@RobdarkRobdark Жыл бұрын

Can I use the dataclasses to simplify the class definition ?

@patinronin2991 10 ай бұрын

Yes You can do it

@fexofenadinaGenerica Жыл бұрын

Nice!

@silentgaming678 Жыл бұрын

What is the use of the representation function i did not understand. Can anyone explain?

@patinronin2991 10 ай бұрын

When You print a object in python it prints in the screen the result of rep method, You can Overdrive this method inside your class to print what You want.

@premmanu6557 Жыл бұрын

Can you do a vid on how to build a neural network to extract data from a lisence

@patinronin2991 10 ай бұрын

You can use object character recognition (ocr) i don't remember what's the name of the package in python

@akartaltepe Жыл бұрын

Is sqlalchemy usable with @dataclass?

@patinronin2991 10 ай бұрын

Yes, You can use it

@christiankoch4627 Жыл бұрын

I prefer querys it is faster for large and complex databases

@astianmuchui 6 ай бұрын

Perfect

@SkyFly19853 Жыл бұрын

Can it be used for video game development in Python?

@ptichiy-krik Жыл бұрын

Yes, of course. You can use this for an easier way to read and write persistent data. Fast-changing data, such as the position of an opponent, is stored in RAM, while slower-changing and longer-term data, such as a high score table, is stored in a database. To work with the database, you can use SQAlchemy

@SkyFly19853 Жыл бұрын

@@ptichiy-krik And that's what I am interested in. Thank you for your explanation.