C# 是否可以在Where子句之外的其他位置使用OleDBCommand参数？

我有以下代码：

using (OleDbCommand cmd = conn.CreateCommand())
{
    cmd.CommandText = string.Format(
        @"SELECT TOP {0} t_accounts.account_no as AccountID, IIF(ISNULL(t_accounts.name),'[blank]',t_accounts.name) AS Name 
        FROM t_accounts 
        INNER JOIN td_department_accounts ON (t_accounts.account_no = td_department_accounts.account_no) 
        WHERE (AccountID >= @firstId) AND type = 'DE'", CountToFetch);
    cmd.CommandType = CommandType.Text;
    cmd.Parameters.AddWithValue("@firstId", FirstId);

  cmd.CommandText = 
        @"SELECT TOP @countToFetch t_accounts.account_no as AccountID, 
    IIF(ISNULL(t_accounts.name),'[blank]',t_accounts.name) AS Name 
        FROM t_accounts 
        INNER JOIN td_department_accounts ON (t_accounts.account_no = 
    td_department_accounts.account_no) 
        WHERE (AccountID >= @firstId) AND type = 'DE'";
    . . .
  cmd.Parameters.AddWithValue("@firstId", FirstId);
  cmd.Parameters.AddWithValue("@countToFetch", CountToFetch);

…但我想知道我是否也可以使用参数作为最高计数，例如：

using (OleDbCommand cmd = conn.CreateCommand())
{
    cmd.CommandText = 
        @"SELECT TOP @count t_accounts.account_no as AccountID, IIF(ISNULL(t_accounts.name),'[blank]',t_accounts.name) AS Name 
        FROM t_accounts 
        INNER JOIN td_department_accounts ON (t_accounts.account_no = td_department_accounts.account_no) 
        WHERE (AccountID >= @firstId) AND type = 'DE'";
    cmd.CommandType = CommandType.Text;
    cmd.Parameters.AddWithValue("@firstId", FirstId);
    cmd.Parameters.AddWithValue("@count", CountToFetch);

…或者数据库参数仅限于WHERE子句

更新 使用此代码：

using (OleDbCommand cmd = conn.CreateCommand())
{
    cmd.CommandText = string.Format(
        @"SELECT TOP {0} t_accounts.account_no as AccountID, IIF(ISNULL(t_accounts.name),'[blank]',t_accounts.name) AS Name 
        FROM t_accounts 
        INNER JOIN td_department_accounts ON (t_accounts.account_no = td_department_accounts.account_no) 
        WHERE (AccountID >= @firstId) AND type = 'DE'", CountToFetch);
    cmd.CommandType = CommandType.Text;
    cmd.Parameters.AddWithValue("@firstId", FirstId);

  cmd.CommandText = 
        @"SELECT TOP @countToFetch t_accounts.account_no as AccountID, 
    IIF(ISNULL(t_accounts.name),'[blank]',t_accounts.name) AS Name 
        FROM t_accounts 
        INNER JOIN td_department_accounts ON (t_accounts.account_no = 
    td_department_accounts.account_no) 
        WHERE (AccountID >= @firstId) AND type = 'DE'";
    . . .
  cmd.Parameters.AddWithValue("@firstId", FirstId);
  cmd.Parameters.AddWithValue("@countToFetch", CountToFetch);

…我得到，“SELECT语句包含拼写错误或缺少的保留字或参数名称，或者标点符号不正确。”

于是我又回到：

   cmd.CommandText = string.Format(
        @"SELECT TOP {0} t_accounts.account_no as AccountID, 
    IIF(ISNULL(t_accounts.name),'[blank]',t_accounts.name) AS Name 
        FROM t_accounts 
        INNER JOIN td_department_accounts ON (t_accounts.account_no = 
    td_department_accounts.account_no) 
        WHERE (AccountID >= @firstId) AND type = 'DE'", CountToFetch);
    . . .
    cmd.Parameters.AddWithValue("@firstId", FirstId);

更新2 这：

…in Access告诉我“SELECT语句包含拼写错误或缺少的保留字或参数名称，或者标点符号不正确。”

注意：邮递员在拨打REST电话时会告诉我与查询结果完全相同的事情

更新3 我也在更新2中尝试过，但用“：”代替“@”，这样：

SELECT TOP (?) t_accounts.account_no as AccountID, IIF(ISNULL(t_accounts.name),'[blank]',t_accounts.name) AS Name 
FROM t_accounts 
INNER JOIN td_department_accounts ON (t_accounts.account_no = td_department_accounts.account_no) 
WHERE (AccountID >= ?) AND type = 'DE'"

我看到一篇文章，它似乎表明这是可行的，至少在T-SQL中是如此。考虑到这一点，我倾向于假设它与Access一起工作。正如上面所说的，记住要包括括号

---

无论如何，参数只能在

WHERE

子句中是绝对不正确的。你可以在

SELECT

，甚至是

ORDER BY

中使用它们，我得到的可能重复的“SELECT语句包含一个保留字或一个拼写错误或缺少的参数名，或者标点不正确。”那篇文章说在括号中包含参数：

SELECT TOP（@countToFetch）t\u账户…

。这样效果更好吗？听起来不错。您可能还想在Access本身中尝试它。有时，这可以毫无理由地提供有价值的见解。当然，这很有可能只是在访问中不可行。这有点令人惊讶，但我想it和T-SQL之间在某些方面肯定存在差异。Access是否像T-SQL一样有语法图？我怀疑这将是一个确定的来源。我只是看了一下，但我只能在Office上找到更“用户友好”的页面，这些页面实际上没有说任何有用的内容。不过，我希望语法与其他参数的语法相同。我是说，这确实是一个有趣的问题。如果不查找SQL，我永远不会猜到或弄明白它需要那些括号，所以它很可能是在寻找一个完全随机的指示符。