Question

当我在SQL Management Studio中运行下面的查询时，它的工作非常出色。

当我在c＃中运行时，结果没有行（只有标题） - 为什么？我单步执行代码。仅返回标头。没有记录。注意：Query2被定义为SQL查询。

SQL Management Studio查询 - 工作

SELECT 
    * 
FROM 
    [TraceData].[dbo].[MachineLog2] 
WHERE 
    [MachineFailReason] not like 'Passed' 
    AND Timestamp  >= CAST(GETDATE()-1 AS DATETIME) + CAST('04:00:00' AS DATETIME)  
ORDER BY Timestamp DESC

C＃代码 - 不起作用

SqlConnection conn2 = new SqlConnection(connectionString);  
string Query2 = @ConfigurationManager.AppSettings["Query2"];  
conn2.Open();

SqlCommand cmd2 = new SqlCommand(Query, conn2); 
SqlDataReader dr2 = cmd2.ExecuteReader();

Answer 1

可能是拼写错误，但您声明If If strQty1 > 0 then strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " End If End If If strQty2 <> "" then If strQty2 > 0 then strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " strXML = strXML & " End If End If 并使用Query2 strQty1 <> "" then <ItemOut quantity=" & chr(34) & strQty1 & chr(34) & " lineNumber=" & chr(34) & i & chr(34) & ">" & strCR <ItemID>" & strCR <SupplierPartID>S1K0R205B</SupplierPartID>" & strCR </ItemID>" & strCR <ItemDetail>" & strCR <UnitPrice>" & strCR <Money currency=" & chr(34) & "USD" & chr(34) & ">9.78</Money>" & strCR </UnitPrice>" & strCR <Description/>" & strCR <UnitOfMeasure>EA</UnitOfMeasure>" & strCR </ItemDetail>" & strCR </ItemOut>" & strCR <ItemOut quantity=" & chr(34) & strQty2 & chr(34) & " lineNumber=" & chr(34) & i & chr(34) & ">" & strCR <ItemID>" & strCR <SupplierPartID>A4216070B16</SupplierPartID>" & strCR </ItemID>" & strCR <ItemDetail>" & strCR <UnitPrice>" & strCR <Money currency=" & chr(34) & "USD" & chr(34) & ">3.96</Money>" & strCR </UnitPrice>" & strCR <Description/>" & strCR <UnitOfMeasure>BX</UnitOfMeasure>" & strCR </ItemDetail>" & strCR </ItemOut>" & strCR

Query

Answer 2

通过将Query放在存储过程中并使用C＃运行存储过程，可以更好地调试或完全解决这样的问题。

因此，创建查询的存储过程看起来像这样

USE TraceData;
GO
CREATE PROCEDURE MyWrappedQuery

AS 
BEGIN

SELECT 
    * 
FROM 
    [TraceData].[dbo].[MachineLog2] 
WHERE 
    [MachineFailReason] not like 'Passed' 
    AND Timestamp  >= CAST(GETDATE()-1 AS DATETIME) + CAST('04:00:00' AS DATETIME)  
ORDER BY Timestamp DESC

END

在C＃中你可以运行查询'exec MyWrappedQuery'或通过ado.net运行SP

尝试并回复此问题，如果查询在SQL Server中有效但不通过C＃，则应该有效。

SQL查询在c＃中不起作用

2 个答案: