如何使用Nettiers从存储的Proc获得标量值
-
04-10-2019 - |
题
我有一个非常简单的存储过程,看起来像这样:
CREATE PROCEDURE _Visitor_GetVisitorIDByVisitorGUID
(
@VisitorGUID AS UNIQUEIDENTIFIER
)
AS
DECLARE @VisitorID AS bigint
SELECT @VisitorID = VisitorID FROM dbo.Visitor WHERE VisitorGUID = @VisitorGUID
--Here's what I've tried
RETURN @VisitorID 'Returns an IDataReader
SELECT @VisitorID 'Returns an IDataReader
--I've also set it up with a single output
--parameter, but that means I need to pass
--the long in by ref and that's hideous to me
我试图让Nettiers生成具有此签名的方法:
public long VisitorService.GetVisitorIDByVisitorGUID(GUID visitorGUID);
基本上,我希望Nettiers致电ExecutesCalar而不是ExecuteReader。我究竟做错了什么?
解决方案
为什么不使用自定义数据访问功能使用ExecuteScalar调用您存储的PROC? ((http://nettiers.com/datalayer.ashx#read_methods:_4)
var vistorId = (long)DataRepository.Provider.ExecuteScalar(CommandType.StoredProcedure, "_Visitor_GetVisitorIDByVisitorGUID");
存储的Proc的主体应该看起来像:
Select VisitorID
FROM dbo.Visitor
WHERE VisitorGUID = @VisitorGUID
Return
或者
Declare @VisitorId bigint
Set @VisitorId = (
Select VisitorId
From dbo.Visitor
Where VisitorGuid = @VisitorGUID
)
Select @VisitorId
Return
其他提示
对于那些想要以编程方式执行此操作的人,上面的示例将不起作用,因为没有任何方法可以使用该方法的任何替代来传递必要的参数值。
var vistorId = (long)DataRepository.Provider.ExecuteScalar(CommandType.StoredProcedure, "_Visitor_GetVisitorIDByVisitorGUID");
我发现完成此操作的唯一方法是将DBCommand作为唯一参数传递给ExecutesCalar方法:
int myReturnID = 0;
using (SqlCommand cmd = new SqlCommand()) {
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "sp_MyStoredProcedure";
cmd.Parameters.Add(new SqlParameter("MyParameter", myParameter));
myReturnID = (Int32)DataRepository.Provider.ExecuteScalar(cmd);
}
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