SQLAlchemy Tutorial in Python

This SQLAlchemy Tutorial is very well suited for beginners and also for experienced programmers. This specially designed free SQLAlchemy tutorial will help you learn SQLAlchemy most efficiently, with all topics from basics to advanced.

What is SQLAlchemy?

SQLAlchemy is referred to as the toolkit of Python SQL that provides developers with the flexibility of using the SQL database. The benefit of using this particular library is that allows Python developers to work with the language’s own objects, and not write separate SQL queries. They can basically use Python to access and work with databases.

Why and Where Use SQLAlchemy?

SQLALchemy is a powerful tool for working with databases in Python, offering developers a simple and easy way to interact with databases. The advantage database of using SQLALchemy is its ability to make the differences between various database engines and allow developers to write database code in a database-agnostic manner, which means we need to write our database logic Once and we can easily switch b/w different database systems such as SQLite, PostgreSQL, MySQL, or Microsoft SQL server easily. Whether you're building a small-scale web application or a large enterprise system, SQLAlchemy can streamline your database interactions and provide a robust foundation for your Python projects.set up

The first and foremost step to get started with SQLAlchemy tutorial is to set up SQLAlchemy in your system. Below are the steps based on your system requirements.

Setting Started with SQLAlchemy

• SQLAlchemy – Introduction
• Install of SQLAlchemy in Windows
• Install of SQLAlchemy in MacOS
• Install of SQLAlchemy in Linux

Now let us deep dive into the basics and components to learn SQLAlchemy :

SQLAlchemy Core

SQLAlchemy Core is a useful Python toolkit for database interaction. In this guide, we'll cover essential concepts like connecting to databases, creating tables, executing SQL expressions, and performing various operations. From basic tasks like selecting rows to advanced techniques such as working with multiple tables and performing joins.

• Connecting to Database
• Creating Table
• SQL Expressions
• Executing Expression
• Selecting Rows
• Using Textual SQL
• Using Aliases
• Using UPDATE Expression
• Using DELETE Expression
• Using Multiple Tables
• Multiple Table Deletes
• SQLALchemy - label
• Using Function
• Multiple Table Updates
• SQLAlchemy Core – Joins
• Using Conjunctions
• Using Union
• Using Set Operations
• Aggregate Functions

SQLAlchemy ORM

SQLAlchemy ORM is a useful tool for simplifying database interactions by mapping tables to Python classes. This guide covers essential tasks like declaring mappings, creating sessions, adding objects, and executing queries. It also delves into advanced topics such as joins, cascading deletes, and handling many-to-many relationships.

• Declaring Mapping
• Column and Data Types
• Creating Session
• Adding Objects
• Using Query
• Applying Filter
• Mapping Python Classes
• SQLAlchemy Filter in List
• Mapping Table Columns
• Textual SQL
• Building Relationship
• Working with Joins
• Cascading Deletes
• db.session.query()
• Delete Statement
• Query and select column
• Update table structure
• Many to Many Relationships

SQLAlchemy Integration with Flask

SQLAlchemy Integration with Flask enables efficient database interactions in Flask apps. Flask-SQLAlchemy simplifies connection setup and model declaration. Authentication with Flask-Login manages user sessions. Raw SQL execution is facilitated. Data can be seamlessly sent between Flask and PostgreSQL databases.

• Connect Flask to a Database with Flask-SQLAlchemy
• Install Flask-Sqlalchemy with Pip
• How to execute raw SQL in Flask-SQLAlchemy app
• Declaring Models in Flask
• How To Add Authentication to Your App with Flask-Login
• Sending data from a Flask app to PostgreSQL Database

Some more SQLAlchemy topics

SQLAlchemy Core focuses on SQL interaction, while SQLAlchemy ORM maps Python objects to databases. You can convert ORM results to Pandas DataFrames, perform bulk inserts, filter by substrings, use aggregate functions, and work with single-column query results. Additionally, you can convert datetime values to strings for manipulation within queries.

• What is the difference between SQLAlchemy Core and ORM?
• SQLAlchemy ORM conversion to Pandas DataFrame
• Join with sum and count of grouped rows in SQLAlchemy
• Bulk insert with SQLAlchemy ORM in Python
• SQLAlchemy Group By With Full Child Objects
• Connecting to SQL Database using SQLAlchemy in Python
• Python SQLAlchemy – Write a query where a column contains a substring
• How to update existing table rows in SQLAlchemy in Python?
• How to use avg and sum in SQLAlchemy Query?
• Group by and count function in SQLAlchemy
• Sum multiple columns in SQLAlchemy
• PostgreSQL ILIKE query with SQLAlchemy
• How to GroupBy and Sum are SQL Columns using SQLAlchemy?
• Python SQLAlchemy - Performing union with three queries
• How to use the IN operator in SQLAlchemy in Python?
• Single-column query results in SQLAlchemy
• How to change date time to string in SQLAlchemy query?
• How to get value from SQLAlchemy instance by column
• PostgreSQL Query To View with SQLAlchemy
• PostgreSQL ILIKE query with SQLAlchemy
• What is the difference between SQLAlchemy Core and ORM?