What functions does the SQLAlchemy framework have in Py…

SQLAlchemy is a Python SQL tool and Object-Relational Mapping (ORM) library that offers a variety of features.

1. Database connections and session management: SQLAlchemy is capable of connecting to various databases using different database connection engines, such as MySQL, PostgreSQL, SQLite, etc. It offers a unified interface for managing database connections and sessions, simplifying the process of database operations.
2. Object-Relational Mapping (ORM): SQLAlchemy offers a way to establish a mapping relationship between database tables and Python objects. By defining Python classes to represent database table structures, developers can interact with the database using Python objects without the need to write SQL statements.
3. Querying and filtering data: SQLAlchemy offers robust capabilities for querying and filtering data, allowing you to write query statements in a SQL-like manner and filter and sort the results through method chaining.
4. Transaction Management: SQLAlchemy enables developers to utilize transactions to execute multiple database operations, ensuring data consistency and integrity. It offers a range of methods to begin, commit, and roll back transactions.
5. SQLAlchemy can automatically create database table structures based on defined Python classes, and also supports updating and migrating database table structures.
6. Management of database relationships: SQLAlchemy supports defining and managing relationships between database tables, such as one-to-one, one-to-many, and many-to-many relationships.
7. Performance optimization for database operations: SQLAlchemy offers features such as lazy loading and caching that can improve the efficiency of database operations.

In general, SQLAlchemy is a feature-rich SQL tool and ORM library that can greatly simplify and accelerate the interaction between Python and databases.