用于JSON导入的MS SQL存储过程-检查输入是否存在

我有以下存储过程

但是，如果“X-Forwarded-For”为空，我希望取而代之的是“remote_address”

我该怎么做

CREATE PROCEDURE dbo.Table(@payload NVARCHAR(MAX))
WITH ENCRYPTION
AS    
  SET NOCOUNT ON;  
  IF (ISJSON(@payload) != 1) THROW 50001, 'JSON data expected', 1;

  INSERT INTO dbo.Table(IP,Time)  
  SELECT JSONData.IP, getdate()
  FROM OPENJSON (@payload)  
           WITH (  
              IP       varchar(50)  N'$.request.headers."X-Forwarded-For"' 
           )  
  AS JSONData;
GO

远程地址的行如下所示：

              IP       varchar(50)  N'$.transaction.remote_address' 

---

噢！我喜欢这个样子：D我刚出去吃午饭，所以今天下午我要考试。谢谢您！

SELECT COALESCE(JSONData.XForwardedForIP, JSONData.RemoteAddressIP), getdate()
FROM OPENJSON (@payload)  
         WITH (  
            XForwardedForIP varchar(50)  N'$.request.headers."X-Forwarded-For"',
            RemoteAddressIP varchar(50)  N'$.transaction.remote_address' 
         )  
AS JSONData;