c# - IndexOutOfRangeException SqlDataReader从表中读取 bool 值

我有3个表：users，feed(id,body,title,link)和userstofeed(id,userid,feedid,isread)，而我尝试从userstofeed表读取bool值时会带来IndexOutOfRangeException。告诉我我在做什么错

while (reader.Read())
{
     rssFeed.Title = reader["title"].ToString();
     rssFeed.Body = reader["body"].ToString();
     rssFeed.Link = reader["link"].ToString();
     rssFeed.IsRead = (bool) reader["isread"]; //IndexOutOfRangeException here
     yield return rssFeed;
}

而这里的SQL存储过程：

create proc spGetItemsByUser
@userName nvarchar(50)
as
begin
declare @userId int
declare @feedId table (id int)

select @userId = id
from Users
where name = @userName

insert into @feedid (id)
select feedid, isread
from userstofeed
where userid = @userId

select * from feed where id in (select id from @feedId)
select isread from userstofeed where userid = @userId //Here I'm getting bit if it read or not
end

最佳答案

将存储过程中的SELECT更改为此：

SELECT [feed].[title], [feed].[body], [feed].[link], [userstofeed].[isread]
FROM [feed]
INNER JOIN [userstofeed] ON ([userstofeed].userid = @userId)
WHERE [feed].[id] in (select id from @feedId)

我认为您的版本isread不是第一个结果集的列。 isread值作为行附加在title，feed和body的行之后。



正如Zohar Peled所建议的那样，我尝试对整个存储过程进行重构：

CREATE PROC spGetItemsByUser
   @userName nvarchar(50)
AS
BEGIN
    SELECT [feed].[title], [feed].[body], [feed].[link], [userstofeed].[isread]
    FROM [feed]
    INNER JOIN [userstofeed] ON ([userstofeed].[feedid] = [feed].[id])
    INNER JOIN [users] ON ([users].[id] = [userstofeed].[userid])
    WHERE [users].[name] = @userName
END

关于c# - IndexOutOfRangeException SqlDataReader从表中读取 bool 值，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/36175489/