Question

我创建了一个服务代理，它将id存储在队列表中。但问题是，当我想在存储过程中获取id时，它现在被格式化为xml。因为服务代理消息是XML。

我怎样才能每次都获得最后一次ID，因为在更新一行后触发了触发器。

在我的代码下面=＆gt;

/****** Object:  Trigger [dba].[TriggerCall]    Script Date: 6/16/2015 2:55:57 PM ******/

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER TRIGGER [dba].[TriggerCall] ON  [dba].[CallID] FOR     UPDATE 
AS 

BEGIN
    SET NOCOUNT ON;
    DECLARE @MessageBody XML  
    DECLARE @ID varchar(50)
    -- Insert statements for trigger here

                --get relevant information from inserted/deleted and convert to xml message  
        SET @MessageBody = (SELECT Id FROM inserted  
        FOR XML AUTO)          

                    If (@MessageBody IS NOT NULL)  
        BEGIN 

                    DECLARE @Handle UNIQUEIDENTIFIER;   
                    BEGIN DIALOG CONVERSATION @Handle   
                    FROM SERVICE [TestServiceInitiator]   
                    TO SERVICE 'TestServiceTarget'   
                    ON CONTRACT [TestContract]   
                    WITH ENCRYPTION = OFF;   
                    SEND ON CONVERSATION @Handle   
                    MESSAGE TYPE [TestMessage](@MessageBody);
        END

END



/****** Object:  StoredProcedure [dbo].[usp_GetCall]    Script Date: 6/16/2015 2:44:27 PM ******/

SET ANSI_NULLS ON 
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[usp_GetCall]
AS
BEGIN 
DECLARE @message_type varchar(100) 
DECLARE @dialog uniqueidentifier, @message_body XML; 
Declare @Object as Int; 
Declare @URL as varchar(255)
Declare @ResponseText as Varchar(8000);
Declare @ID as Varchar(38);

WHILE (1 = 1) 
        BEGIN -- Receive the next available message from the queue 
        WAITFOR ( 
                    RECEIVE TOP(1) @message_type = message_type_name,     
                    @message_body = CAST(message_body AS XML),     
                    @dialog = conversation_handle

        FROM dbo.TestQueue ), TIMEOUT 500    if (@@ROWCOUNT = 0 OR @message_body IS NULL) 

        BEGIN 

                    BREAK 
        END 
              ELSE 
                    BEGIN 

INSERT INTO [dbo].[testtabel]
       ([id]
       ,[callid],
       [test])
 VALUES
       ('111', '111', @message_body)


                    END
        END CONVERSATION @dialog 
        END
END

Answer 1

如果我理解你的问题，你只需要将ID重新水合成一个int。如果是这种情况，则应执行以下操作：

use tempdb;
create table inserted (id int);
insert into inserted values (1);
declare @message_body xml;

set @message_body= (select * from inserted for xml auto);
select @message_body.value('(/inserted/@id)[1]', 'int');

魔术是最后一行（剩下的就是为我设置测试）。

我会借此机会澄清你似乎有的误解。 SQL服务器中的触发器不是每行触发，而是每批触发。因此，如果对表运行更新并更新50行，则触发器将被触发一次，插入（和删除）的表将包含50行。只需考虑一下。

SQL Service Broker

1 个答案: