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db.py
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45 lines (34 loc) · 1.24 KB
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import sqlite3
import click
from flask import current_app, g
# g is a special object that is unique for each request.
# It is used to store data that might be accessed by multiple functions
# during the request.
# The connection is stored and reused instead of creating a new connection
# if get_db is called a second time in the same request.
def get_db():
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):
db = g.pop('db', None)
if db is not None:
db.close()
def init_db():
db = get_db()
with current_app.open_resource('schema.sql') as f:
db.executescript(f.read().decode('utf8'))
@click.command('init-db')
def init_db_command():
"""Clear the existing data and create new tables."""
init_db()
click.echo('Initialized the database.')
# app.taerdown_appcontext() tells Flask to call that function when cleaning up after returning the response.
# app.cli.add_command() adds a new command that can be called with the flask command.
def init_app(app):
app.teardown_appcontext(close_db)
app.cli.add_command(init_db_command)