Add sqlite3 connection

4 files changed, 116 insertions, 0 deletions

diff --git a/README.md b/README.md
index bd987c7..17876c2 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # flask-tutorial
 
+https://flask.palletsprojects.com/en/3.0.x/tutorial
+
 ## Installation
 
 ```bash
@@ -9,3 +11,17 @@ source .venv/bin/activate
 pip install -r requirements.txt
 flask --app flaskr run --debug
 ```
+
+## Learning resources
+
+* https://flask.palletsprojects.com/en/3.0.x/#user-s-guide
+* https://sqlite.org/lang.html
+
+Concepts:
+
+* flask.g: Store data.  Unique for each request
+* flask.current_app:  Link to Flask app
+* flask.open_resource:  From app package path
+* request: HTML request???
+* Factory function > registered functions and blueprints.
+* Blueprint > views & other code
\ No newline at end of file
diff --git a/flaskr/__init__.py b/flaskr/__init__.py
new file mode 100644
index 0000000..19d5a1e
--- /dev/null
+++ b/flaskr/__init__.py
@@ -0,0 +1,38 @@
+import os
+
+from flask import Flask
+
+
+def create_app(test_config=None):
+    # Create app object.  Configuration files are relative to instance folder.
+    app = Flask(__name__, instance_relative_config=True)
+
+    # config
+    app.config.from_mapping(
+        SECRET_KEY='dev',
+        DATABASE=os.path.join(app.instance_path, 'flaskr.sqlite'),
+    )
+
+    if test_config is None:
+        app.config.from_pyfile('config.py', silent=True)
+    else:
+        app.config.from_mapping(test_config)
+
+    try:
+        os.makedirs(app.instance_path)
+    except OSError:
+        pass
+
+    # Routes
+    @app.route('/')
+    def hello():
+        return 'Hello, World!'
+
+    # Register functions and blueprints
+    from . import db
+    db.init_app(app)
+
+    from . import auth
+    app.register_blueprint(auth.bp)
+
+    return app
\ No newline at end of file
diff --git a/flaskr/db.py b/flaskr/db.py
new file mode 100644
index 0000000..7185da8
--- /dev/null
+++ b/flaskr/db.py
@@ -0,0 +1,45 @@
+import sqlite3
+
+import click
+from flask import current_app, g
+
+
+def get_db():
+    if 'db' not in g:
+        g.db = sqlite3.connect(
+            current_app.config['DATABASE'],
+            detect_types=sqlite3.PARSE_DECLTYPES
+        )
+        # Return rows that behave like dicts
+        g.db.row_factory = sqlite3.Row
+
+    return g.db
+
+
+def close_db(e=None):
+    db = g.pop('db', None)
+
+    if db:
+        db.close()
+
+# CLI:
+# https://flask.palletsprojects.com/en/3.0.x/cli/
+
+def init_db():
+    db = get_db()
+
+    with current_app.open_resource('schema.sql') as f:
+        db.executescript(f.read().decode('utf8'))
+
+
[email protected]('init-db')
+def init_db_command():
+    """Clear the existing data and create new tables."""
+    init_db()
+    click.echo('Initialized the database.')
+
+# Register function with application
+
+def init_app(app):
+    app.teardown_appcontext(close_db)       # callback after returning response
+    app.cli.add_command(init_db_command)
\ No newline at end of file
diff --git a/flaskr/schema.sql b/flaskr/schema.sql
new file mode 100644
index 0000000..be76d7e
--- /dev/null
+++ b/flaskr/schema.sql
@@ -0,0 +1,17 @@
+DROP TABLE IF EXISTS user;
+DROP TABLE IF EXISTS post;
+
+CREATE TABLE user (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  username TEXT UNIQUE NOT NULL,
+  password TEXT NOT NULL
+);
+
+CREATE TABLE post (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  author_id INTEGER NOT NULL,
+  created TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  title TEXT NOT NULL,
+  body TEXT NOT NULL,
+  FOREIGN KEY (author_id) REFERENCES user (id)
+);