Question

Work with Starlette

To use GINO with Starlette, the gino-starlette package should be installed first:

pip install gino-starlette

注解

The gino-starlette package supports only GINO 1.0 or later. Earlier versions of GINO like 0.8.x have built-in Starlette support.

This extension provides a Starlette middleware to setup and cleanup database according to the configurations that passed in the kwargs parameter.

The common usage looks like this:

from starlette.applications import Starlette
from gino.ext.starlette import Gino

app = Starlette()
db = Gino(app, **kwargs)

# Or with application factory
app = Starlette()
db = Gino(**kwargs)
db.init_app(app)

Configuration

The config includes:

Name	Description	Default
driver	the database driver	asyncpg
host	database server host	localhost
port	database server port	5432
user	database server user	postgres
password	database server password	empty
database	database name	postgres
dsn	a SQLAlchemy database URL to create the engine, its existence will replace all previous connect arguments.	N/A
pool_min_size	the initial number of connections of the db pool.	N/A
pool_max_size	the maximum number of connections in the db pool.	N/A
echo	enable SQLAlchemy echo mode.	N/A
ssl	SSL context passed to asyncpg.connect	None
use_connection_for_request	flag to set up lazy connection for requests.	N/A
kwargs	other parameters passed to the specified dialects, like asyncpg. Unrecognized parameters will cause exceptions.	N/A

Lazy Connection

If use_connection_for_request is set to be True, then a lazy connection is available at request['connection']. By default, a database connection is borrowed on the first query, shared in the same execution context, and returned to the pool on response. If you need to release the connection early in the middle to do some long-running tasks, you can simply do this:

await request['connection'].release(permanent=False)