如何根据前一个实例增加字段值 [英] How to increment the field value based on the previous instance

问题描述

我有一个要求，在应用程序中，无论何时用户创建新实例，它都应自动分配数字值。例如，如果我们填写一些细节并保存。稍后另一个人将创建一个新实例填充详细信息并保存。那么，对于当前实例，它应该将Instance字段值赋值为2（前一个为1）。

它应该根据之前的值递增。



请告诉我工作流程或如何操作？



我尝试过：



我不确定如何把这些东西连成一个。任何帮助将不胜感激，并提前感谢。

Hi,

I have a requirement where in an application, whenever user creates a new instance, it should assign the number value automatically. For Example, If we fill some details and save. Later another person will create a new instance fill the details and save it. then, for the current instance it should the assign the Instance field value to 2 (as previous one is 1).
It should increment based on the previous value.

Please let me know the workflow or how to do it?

What I have tried:

I'm not sure on this how to link up these all thing into one. Any help will be appreciated and thanks in advance.

推荐答案

一般来说，不要。

这是可能的，但在大多数情况下它是一个坏主意。我假设您正在使用某种形式的数据库，如果是这样，那么您将发现数据库中内置的功能：复制，这是软件投入生产后真正问题的处方。对于数据库，请参阅SQL IDENTITY字段： IDENTITY（属性）（Transact-SQL） [ ^ ]

Generally speaking, don't.
It's possible, but in most cases it's a bad idea. I assume you are using a database of some form, and if so then you will find the capability built into the DB: duplicating that is a recipe for real problems once software gets into production. For a DB, see the SQL IDENTITY field: IDENTITY (Property) (Transact-SQL)[^]

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