Current File : //usr/share/doc/python3-flask/examples/flaskr/db.py
import sqlite3
import click
from flask import current_app
from flask import g
from flask.cli import with_appcontext
def get_db():
"""Connect to the application's configured database. The connection
is unique for each request and will be reused if this is called
again.
"""
if "db" not in g:
g.db = sqlite3.connect(
current_app.config["DATABASE"], detect_types=sqlite3.PARSE_DECLTYPES
)
g.db.row_factory = sqlite3.Row
return g.db
def close_db(e=None):
"""If this request connected to the database, close the
connection.
"""
db = g.pop("db", None)
if db is not None:
db.close()
def init_db():
"""Clear existing data and create new tables."""
db = get_db()
with current_app.open_resource("schema.sql") as f:
db.executescript(f.read().decode("utf8"))
@click.command("init-db")
@with_appcontext
def init_db_command():
"""Clear existing data and create new tables."""
init_db()
click.echo("Initialized the database.")
def init_app(app):
"""Register database functions with the Flask app. This is called by
the application factory.
"""
app.teardown_appcontext(close_db)
app.cli.add_command(init_db_command)
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