将实体数据更新到Azure存储表 [英] Updating entity data to Azure storage table

问题描述

在一种情况下，我将数据插入/更新到Azure存储表2中的值MyValue和MyDate.

I have a scenario where I insert/update data to Azure storage table 2 values MyValue and MyDate.

在少数情况下，我只需要更新1个值MyValue而不是MyDate.

There are few scenarios where I have to update only 1 value MyValue and not MyDate.

但是当我执行更新操作时，它会更新两个值.它会更改myValue，但会使MyDate为null.

But When I do update operation, it updates bothe the values. It changes myValue but makes MyDate to null.

更新中是否有任何操作可以跳过MyDate更新并保持其原样?

Is there any operation in update where I can skip MyDate update and keep its value as it is?

public class MyEntity : TableEntity
{
public MyEntity(string partitionKey, string rowKey) : 
 base(partitionKey, rowKey)
 {
 }
public string MyValue { get; set; }
public DateTime MyTime { get; set; }
}

此代码插入或替换数据

   var entity = new MyEntity(partitionKey, rowKey)
     {
        MyValue = "test my value",
        MyTime = DateTime.Now();
     };

    AddEntity(entity);



     public void AddEntity(MyEntity entity)
     {
     CloudTable table =     _tableClient.GetTableReference("myAzureStorageTableName");
 TableOperation insertOp = TableOperation.InsertOrReplace(entity);
 table.Execute(insertOp);                         
      }

推荐答案

您可以利用合并操作.请注意，您应将ETag设置为"*".如果您不想在更新实体之前先阅读它.

You can leverage Merge operation. Please note that you should set ETag to "*" if you don't want to read the entity before updating it.

参考文献:

1. 合并实体REST API
2. TableOperation.Merge方法

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