如何获取查询返回的列数计数 [英] how to get count of number of columns returned by a query

问题描述

大家好，

我有一种情况，我想获取查询返回的列数.

例如

 选择 * 来自
(选择  1   as  col1， 2   as  col2， 3   4   as  col4)tab1

它具有 4 列，因此我希望将输出 作为  4 

选择 * 来自
(选择  1   as  col1， 2   as  col2)tab1 

它有2列，所以我想输出为2

有没有办法实现这一目标...

任何帮助将不胜感激.

问候，
Gopal

解决方案

而不是在SQL中进行操作，而是通过检查DataTable.Columns.Count属性在应用程序代码中进行操作.

Hi All,

I have a scenario where i want to get the number of columns returned by a query.

For e.g.

select * from
(select 1 as col1, 2 as col2, 3 as col3, 4 as col4) tab1

This has 4 columns so I want output as 4

select * from
(select 1 as col1, 2 as col2) tab1

This has 2 columns so I want output as 2

Is there a way to achieve this ...

Any help would be much appreciated.

Regards,
Gopal

解决方案

Instead of doing it in your SQL, do it in your application code by checking the DataTable.Columns.Count property.

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