code: 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
  
file_path: flask/examples/tutorial/flaskr/db.py
imports: import sqlite3
  import click
  from flask import current_app
  from flask import g
label_desc: Use image node_id 1 for calling a global function with example usage: get_db() and returns: g