rdb

Signed-off-by: Nlihuihui <lihuihui29@huawei.com>

zh-cn/application-dev/database/data-persistence-by-rdb-store.md

@@ -269,6 +269,7 @@
            console.error(`Failed to delete RdbStore. Code:${err.code}, message:${err.message}`);
            return;
          }
+         store = null;
          console.info('Succeeded in deleting RdbStore.');
        });
      }
@@ -289,6 +290,7 @@
        console.error(`Failed to delete RdbStore. Code:${err.code}, message:${err.message}`);
        return;
      }
+     store = null;
      console.info('Succeeded in deleting RdbStore.');
    });
    ```