Question

private void DeleteQuestion_Click(object sender, EventArgs e)
{
    try
    {
        using (OleDbConnection conn = new OleDbConnection(access7ConnectionString))
        {
            conn.Open();

            using (OleDbCommand cmd = new OleDbCommand("DELETE FROM Questions" + "WHERE ID=@ID", conn))
            {
                cmd.Parameters.AddWithValue("@ID", currentRecord);
                cmd.ExecuteNonQuery();
            }
        }
    }
    catch (OleDbException ex)
    {
        MessageBox.Show(ex.ToString());
    }
}

我收到此错误：

Syntax in FROM Clause

我哪里错了？还在学习C＃

access7ConnectionString是数据库的字符串路径，我已将其删除以缩短帖子，但建立了与数据库的连接并且一切正常。

Answer 1

Table Name和WHERE之间没有空格，请放置如下空格：

"DELETE FROM Questions" + " WHERE
                        ///^^^

不确定为什么必须使用字符串连接。这一切都可以与单个字符串相提并论。像：

using (OleDbCommand cmd = new OleDbCommand("DELETE FROM Questions WHERE ID=@ID", conn))

Answer 2

您缺少空格，请更改

"DELETE FROM Questions" + "WHERE ID=@ID"

到

"DELETE FROM Questions WHERE ID=@ID"

FROM子句中的语法

2 个答案: