db: Add initial SQL connection object

And set the row_factory to use the built-in sqlite3.Row so we can access
columns by name in search results

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

db/__init__.py

@@ -0,0 +1,12 @@
+# Copyright 2021 (c) Anna Schumaker.
+import lib
+import sqlite3
+
+File = lib.data.emmental_data / "emmental.sqlite3"
+
+Connection = sqlite3.connect(File)
+Connection.row_factory = sqlite3.Row
+
+commit = Connection.commit
+execute = Connection.execute
+executemany = Connection.executemany

db/test_db.py

@@ -0,0 +1,15 @@
+# Copyright 2021 (c) Anna Schumaker.
+import db
+import lib
+import sqlite3
+import unittest
+
+class TestDB(unittest.TestCase):
+    def test_db_init(self):
+        self.assertEqual(db.File, lib.data.emmental_data / "emmental.sqlite3")
+        self.assertIsInstance(db.Connection, sqlite3.Connection)
+        self.assertEqual(db.Connection.row_factory, sqlite3.Row)
+
+        self.assertEqual(db.commit, db.Connection.commit)
+        self.assertEqual(db.execute, db.Connection.execute)
+        self.assertEqual(db.executemany, db.Connection.executemany)