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Object Relational Tutorial — SQLAlchemy 1.3 Documentation

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The SQLAlchemy Object Relational Mapper presents a method of associating user-defined Python classes with database tables, and instances of those classes (objects) with rows in their corresponding tables. It includes a system that transparently synchronizes all changes in state between objects and their related rows, called a unit of work, as well as a system for expressing database queries in terms of the user defined classes and their defined relationships between each other. The ORM is in contrast to the SQLAlchemy Expression Language, upon which the ORM is constructed. Whereas the SQL Expression Language, introduced in SQL Expression Language Tutorial, presents a system of representing the primitive constructs of the relational database directly without opinion, the ORM presents a high level and abstracted pattern of usage, which itself is an example of applied usage of the Expression Language. While there is overlap among the usage patterns of the ORM and the Expression Language,

Object Relational Tutorial - SQLAlchemy 1.3 Documentation via SQLAlchemy adapter --> Release: 1.3.24 legacy version | Release Date: March 30, 2021 SQLAlchemy 1.3 Documentation SQLAlchemy 1.3 Documentation legacy version Home | Download this Documentation Search terms: SQLAlchemy ORM Object Relational Tutorial ¶ Version Check Connecting Declare a Mapping Create a Schema Create an Instance of the Mapped Class Creating a Session Adding and Updating Objects Rolling Back Querying Common Filter Operators Returning Lists and Scalars Using Textual SQL Counting Building a Relationship Working with Rela

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