reduce from 3 to 2 packages

src/nominatim_db/db/properties.py

@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2024 by the Nominatim developer community.
+# For a full list of authors see the git log.
+"""
+Query and access functions for the in-database property table.
+"""
+from typing import Optional, cast
+
+from .connection import Connection
+
+def set_property(conn: Connection, name: str, value: str) -> None:
+    """ Add or replace the property with the given name.
+    """
+    with conn.cursor() as cur:
+        cur.execute('SELECT value FROM nominatim_properties WHERE property = %s',
+                    (name, ))
+
+        if cur.rowcount == 0:
+            sql = 'INSERT INTO nominatim_properties (value, property) VALUES (%s, %s)'
+        else:
+            sql = 'UPDATE nominatim_properties SET value = %s WHERE property = %s'
+
+        cur.execute(sql, (value, name))
+    conn.commit()
+
+
+def get_property(conn: Connection, name: str) -> Optional[str]:
+    """ Return the current value of the given property or None if the property
+        is not set.
+    """
+    if not conn.table_exists('nominatim_properties'):
+        return None
+
+    with conn.cursor() as cur:
+        cur.execute('SELECT value FROM nominatim_properties WHERE property = %s',
+                    (name, ))
+
+        if cur.rowcount == 0:
+            return None
+
+        result = cur.fetchone()
+        assert result is not None
+
+        return cast(Optional[str], result[0])