sql将列值转换为逗号分隔字符串

Question

如何将返回列转换为逗号分隔字符串？我想要使​​用@sql，但必须手动键入值。

declare @orderId as int, @sql AS VARCHAR(MAX) 
set @orderId = 10 
set @sql = 'select orderId, categoryId, itemId from Orders where orderId = ' + CONVERT(varchar(10), @orderId) 
--select @sql as 'sql stmt' --select orderId, categoryId, itemId from Orders where orderId = 10 
--execute(@sql) 
--will return as: 
--orderId categoryId itemId 
--10 281 1054 
declare @dt table(orderId varchar(10), categoryId varchar(10), itemId varchar(10)) 
--insert @dt values (@sql) 
insert @dt values ('10','281','1054') -- did this to get results but want to use @sql 
--how to get the @sql to be a string as '10','281','1054' 
select '{"orderinfo" : [' + STUFF((
    select 
     ',{"Order Id":' + orderId 
     + ',"Category Id":' + categoryId 
     + ',"Item Id":' + itemId 
     +'}' 

    from @dt 
    for xml path(''), type 
).value('.', 'varchar(max)'), 1, 1, '') + ']}' as jsonData 
--end results: {"orderinfo" : [{"Order Id":10,"Category Id":281,"Item Id":1054}]} 

我最感兴趣的是返回json格式的数据。

Answer 1

declare @orderId as int, @sql AS VARCHAR(MAX) 
set @orderId = 10 
set @sql = 'select orderId, categoryId, itemId from Orders where orderId = ' + CONVERT(varchar(10), @orderId) 

declare @dt table(orderId varchar(10), categoryId varchar(10), itemId varchar(10)) 


insert into @dt exec(@sql) 
-- this is what you needed 


select '{"orderinfo" : [' + STUFF((
    select 
     ',{"Order Id":' + orderId 
     + ',"Category Id":' + categoryId 
     + ',"Item Id":' + itemId 
     +'}' 

    from @dt 
    for xml path(''), type 
).value('.', 'varchar(max)'), 1, 1, '') + ']}' as jsonData 
--end results: {"orderinfo" : [{"Order Id":10,"Category Id":281,"Item Id":1054}]} 

Answer 2

我建议您创建一个标量函数，该函数使用获取并生成描述字符串的游标。

然后在选择查询时调用你的函数。