![]() ** Ever since I was a little baby I was programming in a language called Ruby and using an ORM called ActiveRecord. SQLAlchemy is… an acquired taste, but it’s very popular, and because it’s so popular I am absolutely certain that my distaste for SQLAlchemy is because I’m too stupid to understand it**, so we’re going to use it for this example. Peewee is one that’s pretty simple to get running with, but it isn’t as popular as SQLAlchemy. There are a handful of ORMs that work for Python, and plenty that work with Flask. ORM means Object-relational mapping, which doesn’t mean anything to anyone and no one will ever ask you about that ![]() So the Gods invented ORMs, which basically mean “instead of writing SQL you’ll just write Python and the ORM will talk to the database for you.” Then everyone else was invented, and they didn’t like writing SQL, they just liked writing Python. Once upon a time there were databases, and there was SQL, and there were people who loved writing SQL. That’s a fate worse than ten or twenty unimaginable terrors. ![]() Return dict((scription, value)ĭear Reader, my Sweet Friend, that’s horrible. Oof, eef, aaf, this “simple example” it hurts parts of my body I didn’t even know I had.Īnd then under the header “Easy Querying” it shows you this real baller piece of work: def make_dicts(cursor, row): Brace yourself and take a look at this awesome “simple example of how you can use SQLite 3 with Flask” DATABASE = '/path/to/database.db' def get_db():ĭb = g._database = sqlite3. If you’ve used things like sqlite3 or pg8000 to talk to databases before, you know it can really be a pain to wrangle your data. 6.1.1 Cleaning text in our Jinja2 templates. ![]() 6 Leveling up with advanced SQLAlchemy queries.5.6 Linking from the index to the detail page.5.3 Sending meaningful data to the template.1.3 Why in the name of undiscovered species am I doing this?.Interested in SQL ? Check out this SQL Certification by Intellipaat. You could be able to use your SQLite code to work with MySQL with the URI mapped as in above code. The purpose of using ORM like SQLAlchemy is that you can use a different database with limited or no change in most cases. config = 'mysql+pymysql://username: /db_name' When you install it using pip install pymysql, the SQLALCHEMY_DATABASE_URI will be changing to: app. So I had opted for the MySQL driver with full python implementation pymysql. It was found that the default driver used by the SQLAlchemy ( mqsqldb), didn't get compiled for me in the virtual environment. Else remove it.ĭb.mit() # This is needed to write the changes to database In case your server is not running in the same machine, Put the server IP in place of the localhost.īelow is your code with some little changes: from flask import FlaskĪpp.config = 'mysql://username: /db_name'ĭb.create_all() # In case user table doesn't exists already. My assumptions are your MySQL server is running on the same machine where Flask is also running and the database name is db_name. Would work without any of the changes rather than a proper modification to the database URI, though the examples I had found for using the SQLAlchemy with the MySQL appear to be using a totally different API.Ĭan I (2) migrate my Flask SQLAlchemy code to work with the MySQL database by just modifying the database URI and if so (1) what should be that URI? Username = db.Column(db.String( 80), unique= True)Įmail = db.Column(db.String( 120), unique= True)ĭef _repr_( self): return '' % ernameĪdmin = User( 'admin', ' ') But I am really worried about (2), I had assumed that SQLAlchemy provided an abstraction layer so that simple SQLAlchemy code such as from flask import Flaskįrom import SQLAlchemyĪpp.config = 'sqlite:////tmp/test.db'Ĭlass User( db.Model): id = db.Column(db.Integer, primary_key= True) I presume that (1) is moderately simple and just a matter of being shown how to map, for example, the contents of the connection dialogue I use in my MySQL database tool to an appropriately formatted URL. I'm unclear if any of my existing SQLAlchemy SQLite code will work with the MySQL.I Cannot find out how to connect to the MySQL database (that is, what the SQLALCHEMY_DATABASE_URI should be) and.I had migrated the database itself and have it running under MySQL, but I had built a site with Flask SQLAlchemy and SQLite and want to switch to MySQL. ![]()
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