What are some examples of connection pooling in SQLAlchemy?

What are some examples of connection pooling in SQLAlchemy?

SQLAlchemy provides several options for connection pooling. For example, you can use the QueuePool, which is the default pooling implementation. It maintains a fixed number of connections and reuses them.

Can you show me a code snippet for using QueuePool?

Sure! Here's a simple example:

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

engine = create_engine('sqlite:///example.db', pool_size=5, max_overflow=10)
Session = sessionmaker(bind=engine)
session = Session()

What about using SingletonThreadPool?

The SingletonThreadPool is useful for single-threaded applications. Here's how you can use it:

from sqlalchemy import create_engine

engine = create_engine('sqlite:///example.db', poolclass=SingletonThreadPool)

Are there any performance considerations I should be aware of?

Yes, connection pooling can improve performance by reducing the overhead of establishing connections. However, be mindful of the pool size and the database's capacity to handle concurrent connections.