如何在存储过程中传递常量值

Question

我在存储过程中有以下语句：

INSERT INTO @tblThreatenedSpeciesSubzone
                  (ThreatenedSpeciesZoneID,
                   ManagementZoneID,
                   VegetationZoneID)
   SELECT * 
   FROM OPENXML (@hDoc, '/NewDataSet/tblThreatenedSpeciesSubzone', 2)
   WITH (ThreatenedSpeciesZoneID INT,
         ManagementZoneID INT,
         VegetationZoneID INT) XMLDATA
   WHERE VegetationZoneID = @VegetationZoneIDInXML      

有时＆＃34; managementZone id＆＃34;变为null，我想替换它是否为null然后我想传递常量值＆＃34; 0＆＃34;。有办法吗？

Answer 1

不确定＆＃34;传递常数值＆＃34;，但您始终可以设置默认值：

CREATE PROCEDURE Sales.uspGetSalesYTD
@SalesPerson nvarchar(50) = 'Andersson'  -- default value
AS 

所以：

@ManagementZoneID INT = 0

Answer 2

您可以在select语句中使用coalesce

INSERT INTO @tblThreatenedSpeciesSubzone
                  ( ThreatenedSpeciesZoneID ,
                    ManagementZoneID        ,
                    VegetationZoneID        
                    )
    SELECT 
          ThreatenedSpeciesZoneID ,
          COALESCE(ManagementZoneID,0)        ,
          VegetationZoneID 
    FROM OPENXML (@hDoc, '/NewDataSet/tblThreatenedSpeciesSubzone', 2)
    WITH            (   ThreatenedSpeciesZoneID INT         ,
                    ManagementZoneID            INT         ,
                    VegetationZoneID            INT             ) XMLDATA
    WHERE VegetationZoneID = @VegetationZoneIDInXML