Merge pull request vnpy#3318 from noranhe/dev

[Add] tickoverview
LiYeming · Jul 15, 2022 · be4a7f8 · be4a7f8
2 parents b5f97d9 + d4c8258
commit be4a7f8
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diff --git a/docs/data_manager.md b/docs/data_manager.md
@@ -167,7 +167,7 @@ Interactive Brokers盈透证券（IB）提供丰富的外盘市场历史数据
 
 ## 更新数据
 
-在用户**配置了数据服务**或者**交易接口（已连接）提供充足的历史数据**的情况下，点击右上角的【更新数据】按钮，即可基于数据库中已有的合约数据，执行一键自动下载更新。
+在用户**配置了数据服务**或者**交易接口（已连接）提供充足的历史数据**的情况下，点击右上角的【更新数据】按钮，即可基于图形界面上显示的所有合约数据，执行一键自动下载更新。
 
 更新前图形界面显示如下图：
 

diff --git a/vnpy/trader/database.py b/vnpy/trader/database.py
@@ -36,6 +36,20 @@ class BarOverview:
     end: datetime = None
 
 
+@dataclass
+class TickOverview:
+    """
+    Overview of tick data stored in database.
+    """
+
+    symbol: str = ""
+    exchange: Exchange = None
+    interval: Interval = Interval.TICK
+    count: int = 0
+    start: datetime = None
+    end: datetime = None
+
+
 class BaseDatabase(ABC):
     """
     Abstract database class for connecting to different database.