SqlCommand在嘗試使用c執行查詢時返回錯誤＃

Question

我正在研究一個項目，該項目將允許用戶通過選擇列來構建查詢。

我的應用程序似乎工作正常，並生成正確的查詢。但是，當我執行查詢我得到下面的異常

列「Tasks.Duration」在選擇列表中無效，因爲它是 不包含在聚合函數或GROUP BY子句。

什麼，因爲這裏不作是我的查詢實際上包括正確GROUP BY聲明

這裏是我的應用程序生成的

SELECT 
[Campaign].[Title] AS [CampaignTitle] 
,CASE WHEN [Task].[Duration] <= @p0 THEN @p1 WHEN [Task].[Duration] >= @p2 AND [Task].[Duration] <= @p3 THEN @p4 ELSE @p5 END AS [9pl1WbY1ZkSvSpel3g4xmw] 
,COUNT(1) AS [Ib7ZS4arHkSUWhf4saEtmg] 
,SUM(CASE WHEN [Task].[Duration] <= @p6 THEN @p7 ELSE @p8 END) AS [xW1GmttC6kWHsc9QIEPN9w] 
FROM [Tasks] AS [Task] 
INNER JOIN [Campaigns] AS [Campaign] ON [Campaign].[Id] = [Task].[CampaignId] 
INNER JOIN [Users] AS [User] ON [User].[Id] = [Task].[CompletedBy] 
INNER JOIN [Results] AS [Result] ON [Result].[Id] = [Task].[ResultId] 
WHERE 
[Result].[IsCompleted] = @p9 AND ([User].[LastName] = @p10 OR [User].[LastName] = @p11) 
GROUP BY 
[Campaign].[Title] 
,CASE WHEN [Task].[Duration] <= @p13 THEN @p14 WHEN [Task].[Duration] >= @p15 AND [Task].[Duration] <= @p16 THEN @p17 ELSE @p18 END 
HAVING 
COUNT(1) >= @p12 
ORDER BY 
[Campaign].[Title] 
,CASE WHEN [Task].[Duration] <= @p19 THEN @p20 WHEN [Task].[Duration] >= @p21 AND [Task].[Duration] <= @p22 THEN @p23 ELSE @p24 END 

查詢更重要的是，我試圖手動更換帶參數值的參數名稱。然後我把他們輸出的查詢，我在SSMS中執行它，它沒有任何問題。

這是我如何執行查詢

using (SqlConnection connection = new SqlConnection(this.connectionString)) 
using (SqlDataAdapter sqlAdapter = new SqlDataAdapter(selectCommand)) 
{ 
    try 
    { 
     selectCommand.Connection = connection; 

     DataTable table = new DataTable(); 

     sqlAdapter.Fill(table); 

     return table; 
    } 
    catch (Exception e) 
    { 
     throw new ReportException(string.Format("{0} {1}", e.Message, e.GetType().FullName)); 
    } 
} 

下面是我用與他們的價值觀

private string GetPlainQuery(SqlCommand selectCommand) 
{ 
    string output = selectCommand.CommandText; 

    for (int i = selectCommand.Parameters.Count - 1; i >= 0; i--) 
    { 
     var p = selectCommand.Parameters[i]; 

     string value = p.Value.ToString(); 

     if (p.SqlDbType == SqlDbType.NChar || p.SqlDbType == SqlDbType.NText || p.SqlDbType == SqlDbType.NVarChar || p.SqlDbType == SqlDbType.Text || p.SqlDbType == SqlDbType.Char || p.SqlDbType == SqlDbType.Date || p.SqlDbType == SqlDbType.DateTime || p.SqlDbType == SqlDbType.SmallDateTime) 
     { 
      value = string.Format("'{0}'", value.Replace("'", "''")); 
     } 

     output = output.Replace(p.ParameterName, value); 
    } 

    return output; 
} 

是什麼原因造成這個錯誤，以取代參數的方法？我該如何解決它？

修訂

下面是該查詢後，我替換爲值的參數

SELECT 
[Campaign].[Title] AS [CampaignTitle] 
,CASE WHEN [Task].[Duration] <= 100 THEN '<100' WHEN [Task].[Duration] >= 100 AND [Task].[Duration] <= 200 THEN 'BETWEEN 100 AND 200' ELSE '>200' END AS [9pl1WbY1ZkSvSpel3g4xmw] 
,COUNT(1) AS [Ib7ZS4arHkSUWhf4saEtmg] 
,SUM(CASE WHEN [Task].[Duration] <= 100 THEN 1 ELSE 0 END) AS [xW1GmttC6kWHsc9QIEPN9w] 
FROM [Tasks] AS [Task] 
INNER JOIN [Campaigns] AS [Campaign] ON [Campaign].[Id] = [Task].[CampaignId] 
INNER JOIN [Users] AS [User] ON [User].[Id] = [Task].[CompletedBy] 
INNER JOIN [Results] AS [Result] ON [Result].[Id] = [Task].[ResultId] 
WHERE 
[Result].[IsCompleted] = 1 AND ([User].[LastName] = 'Yo' OR [User].[LastName] = 'Smith') 
GROUP BY 
[Campaign].[Title] 
,CASE WHEN [Task].[Duration] <= 100 THEN '<100' WHEN [Task].[Duration] >= 100 AND [Task].[Duration] <= 200 THEN 'BETWEEN 100 AND 200' ELSE '>200' END 
HAVING 
COUNT(1) >= 0 
ORDER BY 
[Campaign].[Title] 
,CASE WHEN [Task].[Duration] <= 100 THEN '<100' WHEN [Task].[Duration] >= 100 AND [Task].[Duration] <= 200 THEN 'BETWEEN 100 AND 200' ELSE '>200' END 

Answer 1

我的猜測是，該錯誤是由於在選擇列表中你的case語句是不一樣的作爲你的團隊中的一員。我通常做的是在子查詢中解析這些列，以便更容易閱讀和維護外部查詢。

Answer 2

我在這裏缺少的東西是框架將首先驗證它們在替換參數之前進行查詢。

由於參數名稱在select和group by中不同，因此框架假定它們具有不同的值，從而導致問題出現。

解決方案是重用相同的參數名稱，以保證框架保證值是相同的。