text: import sqlite3
  
  import click
  from flask import current_app, g
  from flask.cli import with_appcontext
  
  
  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')
  @with_appcontext
  def init_db_command():
      """Clear the existing data and create new tables."""
      init_db()
      click.echo('Initialized the database.')
  
  def init_app(app):
      app.teardown_appcontext(close_db)
      app.cli.add_command(init_db_command)
  