database infrastructure

1 files changed, 40 insertions, 0 deletions

diff --git a/apioforum/db.py b/apioforum/db.py
new file mode 100644
index 0000000..be2d7e0
--- /dev/null
+++ b/apioforum/db.py
@@ -0,0 +1,40 @@
+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('database.db',detect_types=sqlite3.PARSE_DECLTYPES)
+        g.db.row_factory = sqlite3.Row
+    g.db.execute("PRAGMA foreighn_keys = ON;")
+    return g.db
+
+def close_db(e=None):
+    db = g.pop('db', None)
+    if db is not None:
+        db.close()
+
+migrations = [
+]
+
+def init_db():
+    db = get_db()
+    version = db.execute("PRAGMA user_version;").fetchone()[0]
+    for i in range(version, len(migrations)):
+        db.executescript(migrations[i])
+        db.execute(f"PRAGMA user_version = {i+1}")
+        db.commit()
+        click.echo(f"migration {i}")
+
+@click.command("migrate")
+@with_appcontext
+def migrate_command():
+    """update database scheme etc"""
+    init_db()
+    click.echo("ok")
+
+def init_app(app):
+    app.teardown_appcontext(close_db)
+    app.cli.add_command(migrate_command)
+