Question

我还是.NET的新手，我无法理解为什么从应用程序到数据库工作正常的sql语句现在在我尝试卸载时无效它的服务。我有一个Winform，它有一个日期，运营商和上传者复选框，根据检查的内容，sql语句应该像应用程序与数据库对话时一样遵守它。我是否必须为每个可能的选项编写OperationContract？（即，仅限日期，日期和承运人，日期和上传者等等。）谢谢！

public DataSet GetStatTableYear(StatDetails statInfo)
    {
        SqlConnection con = new SqlConnection("Data Source=localhost\\sqlexpress;Initial Catalog=vurdevice;Integrated Security=True");
        con.Open();
        SqlCommand cmd = new SqlCommand(@"SELECT CONVERT(VARCHAR(4), CreateDate, 112) AS cPeriod, COUNT(DISTINCT IMEINo) AS TotalIMEINo, COUNT(*) AS TotalImageCnt, SUM(FileSize) AS TotalFileSize
                FROM VR_Image
                WHERE (@Uploader IS NULL OR Uploader = @Uploader) 
                AND (@CarrierID IS NULL OR CarrierID = @CarrierID) 
                AND DeleteDate IS NULL
                GROUP BY CONVERT(VARCHAR(4), CreateDate, 112)
                ORDER BY cPeriod", con);
        cmd.Parameters.AddWithValue("@CarrierID", statInfo.CarrierID);
        cmd.Parameters.AddWithValue("@Uploader", statInfo.Uploader);
        SqlDataAdapter sda = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        sda.Fill(ds);
        cmd.ExecuteNonQuery();
        con.Close();
        return ds;
    }

Answer 1

在您使用集成安全性的连接字符串中，这意味着使用Windows身份验证来建立连接。

您的Windows窗体应用程序在Windows帐户安全上下文中运行，并且可以连接。

除非您在IIS和web.config中启用它，否则WCF应用程序很可能不使用Windows身份验证，在这种情况下，我认为IIS APP池身份/帐户无法访问数据库以建立该连接。

这是我在这个阶段最好的猜测，因为你没有解释你收到的失败细节。

Answer 2

我找到了一个完美的解决方案。由于服务一直忽略了sql语句......

WHERE (Uploader IS NULL OR Uploader = @Uploader)
AND (CarrierID IS NULL OR CarrierID = @CarrierID)

当没有任何东西可用时，我将DBNull分配给它，现在它正常工作。

新代码

public DataSet GetStatTableYear(StatDetails statInfo)
    {
        using (SqlConnection con = new SqlConnection("Data Source=localhost\\sqlexpress;Initial Catalog=vurdevice;Integrated Security=True"))
        {
            con.Open();
            SqlCommand cmd = new SqlCommand(@"SELECT CONVERT(VARCHAR(4), CreateDate, 112) AS cPeriod, COUNT(DISTINCT IMEINo) AS TotalIMEINo, COUNT(*) AS TotalImageCnt, SUM(FileSize) AS TotalFileSize
                    FROM VR_Image
                    WHERE (Uploader IS NULL OR Uploader = @Uploader) 
                    AND (CarrierID IS NULL OR CarrierID = @CarrierID) 
                    AND DeleteDate IS NULL
                    GROUP BY CONVERT(VARCHAR(4), CreateDate, 112)
                    ORDER BY cPeriod", con);
            cmd.Parameters.AddWithValue("@CarrierID", statInfo.CarrierID == null ? DBNull.Value.ToString() : statInfo.CarrierID);
            cmd.Parameters.AddWithValue("@Uploader", statInfo.Uploader == null ? DBNull.Value.ToString() : statInfo.Uploader);
            SqlDataAdapter sda = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            con.Close();
            return ds;
        }
    }

为什么SQL语句在创建数据库时有效，而不是通过WCF？

2 个答案: