add lock window function, and did some improvements for the whole structure

gui/codes/common/db_operation.py

@@ -1,5 +1,4 @@
 import sqlite3
-from threading import Lock
 import time
 from codes.common import clibs
 
@@ -30,10 +29,10 @@ def db_init(db_file):
 def db_lock(func):
     def wrapper(*args, **kwargs):
         try:
-            Lock().acquire(True)
+            clibs.lock.acquire(True)
             ret = func(*args, **kwargs)
         finally:
-            Lock().release()
+            clibs.lock.release()
         return ret
     return wrapper
 
@@ -47,8 +46,7 @@ def db_backup():
         db_file_backup.write_bytes(db_file.read_bytes())
         db_dir = clibs.base_path / "assets/database"
         db_list = [db for db in db_dir.glob("*.db")]
-        print(f"db_list: {sorted(db_list)}")
-        for db in sorted(db_list)[:-clibs.max_db_number]:
+        for db in sorted(db_list)[:-clibs.account["maximum_db_number"]]:
             db.unlink()
 
 def db_conn():
@@ -61,4 +59,9 @@ def db_conn():
     cursor.execute("PRAGMA temp_store=memory")
     cursor.execute("PRAGMA mmap_size=30000000000")
     cursor.execute("PRAGMA cache_size=200000")
-    return conn, cursor
+    return conn, cursor
+
+@db_lock
+def db_close(conn, cursor):
+    cursor.close()
+    conn.close()