如何通過使用ADO.NET使用複雜查詢

Question

SELECT 
    Wot.WorkOrderType, 
    COUNT(CASE WHEN Wo.Status = 'C' THEN 1 END) as [Completed], 
    COUNT(CASE WHEN Wo.Status = 'E' THEN 1 END) as [Error] 
FROM WorkOrder_2002 Wo 
INNER Join WorkOrderType Wot ON Wo.WorkOrderTypeId= wot.Id 
WHERE Wo.CreateTime BETWEEN '2012-04-01' AND '2012-05-15' 
GROUP BY Wo.WorkOrderTypeId,Wot.WorkOrderType 
ORDER BY Wo.WorkOrderTypeId,Wot.WorkOrderType 

我想使用上面提到的查詢通過使用ADO.NET（我想在SqlCommand中傳遞此查詢）檢索記錄。 我想在where子句中傳遞兩個日期。

Answer 1

SqlConnection connection = new SqlConnection(CONNECTIONSTRING); 
connection.Open; 

SqlCommand cmd = connection.CreateCommand(); 
cmd.CommandText = @"SELECT 
     Wot.WorkOrderType, 
     COUNT(CASE WHEN Wo.Status = 'C' THEN 1 END) as [Completed], 
     COUNT(CASE WHEN Wo.Status = 'E' THEN 1 END) as [Error] 
    FROM WorkOrder_2002 Wo 
    INNER Join WorkOrderType Wot ON Wo.WorkOrderTypeId= wot.Id 
    WHERE Wo.CreateTime BETWEEN @startdate AND @enddate 
    GROUP BY Wo.WorkOrderTypeId,Wot.WorkOrderType 
    ORDER BY Wo.WorkOrderTypeId,Wot.WorkOrderType"; 
cmd.Parameters.AddWithValue("@startdate", DateTime.Parse("2012-04-01")); 
cmd.Parameters.AddWithValue("@enddate", DateTime.Parse("2012-05-15")); 

// Do whatever you want with the SqlCommand now...