我的查询中的select语句有问题。这个sql查询在SqlServer Management Studio中工作,并选择了请求的数据,但在我的类中,它给了我一个错误“查询语法无效。近期'*',第9行,第47列。那么我的From论文F子句中的另一个错误就是在取出LastPostBy,LastPostDate和LastPostTitle之后,我也在LastPostTitle中发生错误,但正如我所说的那样,它在SQLServer Management Studio中起作用。我最初试图做一个“Exec sproc_Forums_GetForums”存储过程,并没有工作,这是我第一次尝试在实体中使用这种方法。 我所有的查询假设做的就是一个论坛,并从两个表中显示的信息命名论坛和帖子EntityCommand SQL错误
public List<Forum> GetForums()
{
List<Forum> forums = null;
using (EntityConnection conn = new EntityConnection("name=CMSEntities"))
{
conn.Open();
string query = @"
SELECT ForumGroup = (
CASE WHEN ParentID IS NOT NULL THEN
(SELECT Title FROM Forums WHERE ForumID = F.ParentID)
ELSE
(SELECT Title FROM Forums WHERE ParentID IS NULL)
END),
F.Title, F.Description,
ThreadCount = (SELECT COUNT(*) FROM Posts P WHERE P.ForumID = F.ForumID),
LastPostBy = (SELECT TOP 1 AddedBy FROM Posts P WHERE P.ForumID = F.ForumID ORDER BY P.PostID DESC),
LastPostDate = (SELECT TOP 1 AddedDate FROM Posts P WHERE P.ForumID = F.ForumID ORDER BY P.PostID DESC),
LastPostTitle = (SELECT TOP 1 Title FROM Posts P WHERE P.ForumID = F.ForumID ORDER BY P.PostID DESC)
FROM Forums F WHERE ParentID IS NOT NULL
ORDER BY Title
";
EntityCommand cmd = new EntityCommand(query, conn);
using (EntityDataReader reader = cmd.ExecuteReader(System.Data.CommandBehavior.SequentialAccess))
{
while (reader.Read())
{
Forum forum = new Forum(
(int)reader["ForumID"],
"",
DateTime.Now,
reader["Title"].ToString(),
reader["Description"].ToString(),
0,
false,
null,
null,
null,
true,
reader["ForumGroup"].ToString(),
(int)reader["ThreadCount"],
reader["LastPostBy"].ToString(),
(DateTime)reader["LastPostDate"],
reader["LastPostTitle"].ToString());
forums.Add(forum);
}
return forums;
}
}
}
}
这里有个建议:使用SQL Server Profiler查看发送给SQL Server的确切查询是什么。 – Beatles1692 2012-02-05 08:45:18
你如何使用SQL Server Profiler和VS2010在哪里 – ONYX 2012-02-05 09:00:55
打开你的sql管理工作室,tools-> profiler :) – 2012-02-05 09:19:45