asp.net - 带参数的 SELECT TOP 语法不正确

Question

我以前有这个

Dt = MyMod.GetDataTable("SELECT TOP " & QuestionsPerCats(i) & " * From Questions WHERE CategoriesID ='" & Cats(i) & "' ORDER BY NEWID()")

但现在我决定使用 sqlparameters 之类的

Dim cmd As New SqlCommand("SELECT TOP @QuestionsPerCats * From Questions WHERE CategoriesID = @CategoriesID ORDER BY NEWID()", conn)
Dim sqlParam As SqlParameter = Nothing
sqlParam = cmd.Parameters.Add("@QuestionsPerCats", SqlDbType.SmallInt)
sqlParam.Value = QuestionsPerCats(i)
sqlParam = cmd.Parameters.Add("@CategoriesID", SqlDbType.SmallInt)
sqlParam.Value = Cats(i)

不幸的是“呈现”像

SELECT TOP @QuestionsPerCats * From Questions WHERE CategoriesID = @CategoriesID ORDER BY NEWID()

并返回以下错误

Incorrect syntax near '@QuestionsPerCats'.

那么我在这里做错了什么？

Answer 1

尝试：

SELECT TOP (@QuestionsPerCats) *
FROM Questions
WHERE CategoriesID = @CategoriesID
ORDER BY NEWID()

（SQL Server 2005 及更高版本）

Answer 2

在 () 中包含 @QuestionsPerCats，如此链接中所定义

SELECT TOP (@QuestionsPerCats) * 
From Questions 
WHERE CategoriesID = @CategoriesID ORDER BY NEWID()

Answer 3

尝试将其更改为：

cmd.Parameters.Add("@QuestionsPerCats", SqlDbType.SmallInt)
cmd.Parameters("@QuestionsPerCats").Value = QuestionsPerCats(i)


cmd.Parameters.Add("@CategoriesID", SqlDbType.SmallInt)
cmd.Parameters("@CategoriesID").Value = Cats(i)

您用于向命令添加参数的方法有点奇怪。我怀疑这可能是您的错误的原因。