MySQL Connector：未添加参数

Question

查看MySQL的查询日志，我看到我的参数没有被添加。这是我的代码：

MySqlConnection conn = new MySqlConnection(ApplicationVariables.ConnectionString());
                MySqlCommand com = new MySqlCommand();

                try
                {
                    conn.Open();
                    com.Connection = conn;
                    com.CommandText = String.Format(@"SELECT COUNT(*) AS totalViews
                                                      FROM pr_postreleaseviewslog AS prvl
                                                      WHERE prvl.dateCreated BETWEEN (@startDate) AND (@endDate) AND prvl.postreleaseID IN ({0})"
                                                      , ids);
                    com.CommandType = CommandType.Text;
                    com.Parameters.Add(new MySqlParameter("@startDate", thisCampaign.Startdate));
                    com.Parameters.Add(new MySqlParameter("@endDate", endDate));

                    numViews = Convert.ToInt32(com.ExecuteScalar());
                }
                catch (Exception ex)
                {
                }
                finally
                {
                    conn.Dispose();
                    com.Dispose();
                }

查看查询日志，我看到了：

SELECT COUNT(*) AS totalViews
                                                      FROM pr_postreleaseviewslog AS prvl
                                                      WHERE prvl.dateCreated BETWEEN (@startDate) AND (@endDate) AND prvl.postreleaseID IN (1,2)

我在无数项目中使用了MySQL .NET连接器（实际上我有一个基类来负责打开这些连接，并用事务关闭它们等）。但是，我接手了这个应用程序，现在我在这里。

感谢您的帮助！

Answer 1

试试这样。

mySqlCommand.Parameters.Add("@CustomerID", SqlDbType.NChar, 5);
mySqlCommand.Parameters["@CustomerID"].Value = "T1COM";

Answer 2

某些SQL客户端，特别是对于MySql使用“？”而不是“@”。