sql - 使用存储过程的输入变量设置 SELECT 语句的字段选择

Question

以下简单的存储过程无法返回结果集，即使单独运行这个简单的 SELECT 语句与实际值也可以正常工作。任何想法为什么？

ALTER PROCEDURE [dbo].[PageHeadingGetText]
    @PageType nvarchar(100)
AS

BEGIN
    SET NOCOUNT ON;

    SELECT @PageType FROM [dbo].[PageHeadingText] 
END

Answer 1

You didn't ask directly but in the title you say "Setting the field selection of a SELECT". You have to use dynamic SQL to dynamically build a statement :

ALTER PROCEDURE [dbo].[PageHeadingGetText]
    @columns nvarchar(max)
AS

BEGIN
    SET NOCOUNT ON;

    DECLARE @sqlCommand NVARCHAR(MAX)

    SET @sqlCommand = 'SELECT ' + @columns + ' FROM [dbo].[PageHeadingText]' 

    EXECUTE sp_executesql @sqlCommand
END