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Service Broker：多服务器单信息传递，大小写敏感
组成：
Message:信内容，为便于区分保证唯一性，信息的前缀用域名好一些。
Contracts：信头，组合message及message由哪边发送，发起者或者接收者
Queue：信封,收到的信息存储的位置
建立方式：
1，定义 SERVICE：将上面三者组合
2，信息发送：
BEGIN TRY
BEGIN TRANSACTION;
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @msg NVARCHAR(MAX);
BEGIN DIALOG CONVERSATION @ch
FROM SERVICE [InitiatorService]
TO SERVICE 'TargetService'
ON CONTRACT [http://ssb.csharp.at/SSB_Book/c03/HelloWorldContract]
WITH ENCRYPTION = OFF;
SET @msg =
'<HelloWorldRequest>
Klaus Aschenbrenner
</HelloWorldRequest>';
SEND ON CONVERSATION @ch MESSAGE TYPE [http://ssb.csharp.at/SSB_Book/c03/RequestMessage] (@msg);
COMMIT
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
GO
3，接收信息
--***********************************************************************************
--* Retrieve the sent message from the queue "TargetQueue" with a WAITFOR statement
--***********************************************************************************
DECLARE @cg UNIQUEIDENTIFIER
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @messagetypename NVARCHAR(256)
DECLARE @messagebody XML;
BEGIN TRY
BEGIN TRANSACTION;
WAITFOR (
RECEIVE TOP (1)
@cg = conversation_group_id,
@ch = conversation_handle,
@messagetypename = message_type_name,
@messagebody = CAST(message_body AS XML)
FROM TargetQueue
), TIMEOUT 60000
IF (@@ROWCOUNT > 0)
BEGIN
PRINT 'Conversation group: ' + CAST(@cg AS NVARCHAR(MAX))
PRINT 'Conversation handle: ' + CAST(@ch AS NVARCHAR(MAX))
PRINT 'Message type: ' + @messagetypename
PRINT 'Message body: ' + CAST(@messagebody AS NVARCHAR(MAX))
END
COMMIT
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
GO
4，监控对列
CREATE EVENT NOTIFICATION PoisonMessageNotification ON QUEUE TargetQueue
FOR Broker_Queue_Disabled
TO SERVICE 'PoisonMessageNotifyService', 'current database'
GO
---------------------------明细
USE master;
IF EXISTS (SELECT * FROM sys.databases WHERE name = 'Chapter3_HelloWorldSvc')
BEGIN
PRINT 'Dropping database ''Chapter3_HelloWorldSvc''';
DROP DATABASE Chapter3_HelloWorldSvc;
END
GO
CREATE DATABASE Chapter3_HelloWorldSvc
GO
USE Chapter3_HelloWorldSvc
GO
--*********************************************
--* Create the message type "RequestMessage"
--*********************************************
CREATE MESSAGE TYPE
[http://ssb.csharp.at/SSB_Book/c03/RequestMessage]
VALIDATION = NONE
GO
--*********************************************
--* Create the message type "ResponseMessage"
--*********************************************
CREATE MESSAGE TYPE
[http://ssb.csharp.at/SSB_Book/c03/ResponseMessage]
VALIDATION = NONE
GO
--*********************************************
--* Show the created message types
--*********************************************
SELECT * FROM sys.service_message_types
GO
--************************************************
--* Changing the validation of the message types
--************************************************
ALTER MESSAGE TYPE [http://ssb.csharp.at/SSB_Book/c03/RequestMessage]
VALIDATION = WELL_FORMED_XML
GO
ALTER MESSAGE TYPE [http://ssb.csharp.at/SSB_Book/c03/ResponseMessage]
VALIDATION = WELL_FORMED_XML
GO
--************************************************
--* Create the contract "HelloWorldContract"
--************************************************
CREATE CONTRACT [http://ssb.csharp.at/SSB_Book/c03/HelloWorldContract]
(
[http://ssb.csharp.at/SSB_Book/c03/RequestMessage] SENT BY INITIATOR,
[http://ssb.csharp.at/SSB_Book/c03/ResponseMessage] SENT BY TARGET
)
GO
--*************************************************************
--* Getting some information about the newly created contract
--*************************************************************
SELECT
sc.name AS 'Contract',
mt.name AS 'Message type',
cm.is_sent_by_initiator,
cm.is_sent_by_target,
mt.validation
FROM sys.service_contract_message_usages cm
INNER JOIN sys.service_message_types mt ON cm.message_type_id = mt.message_type_id
INNER JOIN sys.service_contracts sc ON sc.service_contract_id = cm.service_contract_id
GO
--********************************************************
--* Create the queues "InitiatorQueue" and "TargetQueue"
--********************************************************
CREATE QUEUE InitiatorQueue
WITH STATUS = ON
GO
CREATE QUEUE TargetQueue
WITH STATUS = ON
GO
--*************************************************************
--* Getting some information about the newly created queues
--*************************************************************
SELECT * FROM sys.service_queues
GO
--************************************************************
--* Create the queues "InitiatorService" and "TargetService"
--************************************************************
CREATE SERVICE InitiatorService
ON QUEUE InitiatorQueue
(
[http://ssb.csharp.at/SSB_Book/c03/HelloWorldContract]
)
GO
CREATE SERVICE TargetService
ON QUEUE TargetQueue
(
[http://ssb.csharp.at/SSB_Book/c03/HelloWorldContract]
)
GO
--*************************************************************
--* Getting some information about the newly created services
--*************************************************************
SELECT
sv.name AS 'Service',
sc.name AS 'Contract'
FROM sys.services sv
INNER JOIN sys.service_contract_usages scu ON scu.service_id = sv.service_id
INNER JOIN sys.service_contracts sc ON sc.service_contract_id = scu.service_contract_id
GO
--********************************************************************
--* Sending a message from the InitiatorService to the TargetService
--********************************************************************
BEGIN TRY
BEGIN TRANSACTION;
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @msg NVARCHAR(MAX);
BEGIN DIALOG CONVERSATION @ch
FROM SERVICE [InitiatorService]
TO SERVICE 'TargetService'
ON CONTRACT [http://ssb.csharp.at/SSB_Book/c03/HelloWorldContract]
WITH ENCRYPTION = OFF;
SET @msg =
'<HelloWorldRequest>
Klaus Aschenbrenner
</HelloWorldRequest>';
SEND ON CONVERSATION @ch MESSAGE TYPE [http://ssb.csharp.at/SSB_Book/c03/RequestMessage] (@msg);
COMMIT
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
GO
--********************************************************************
--* View the sent message on the queue "TargetQueue"
--********************************************************************
SELECT * FROM TargetQueue
GO
--********************************************************************
--* View the created conversation endpoints
--********************************************************************
SELECT * FROM sys.conversation_endpoints
GO
--********************************************************************
--* Retrieve the sent message from the queue "TargetQueue"
--********************************************************************
DECLARE @cg UNIQUEIDENTIFIER
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @messagetypename NVARCHAR(256)
DECLARE @messagebody XML;
BEGIN TRY
BEGIN TRANSACTION;
RECEIVE TOP(1)
@cg = conversation_group_id,
@ch = conversation_handle,
@messagetypename = message_type_name,
@messagebody = CAST(message_body AS XML)
FROM TargetQueue
PRINT 'Conversation group: ' + CAST(@cg AS NVARCHAR(MAX))
PRINT 'Conversation handle: ' + CAST(@ch AS NVARCHAR(MAX))
PRINT 'Message type: ' + @messagetypename
PRINT 'Message body: ' + CAST(@messagebody AS NVARCHAR(MAX))
COMMIT
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
GO
--***********************************************************************************
--* Retrieve the sent message from the queue "TargetQueue" with a WAITFOR statement
--***********************************************************************************
DECLARE @cg UNIQUEIDENTIFIER
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @messagetypename NVARCHAR(256)
DECLARE @messagebody XML;
BEGIN TRY
BEGIN TRANSACTION;
WAITFOR (
RECEIVE TOP (1)
@cg = conversation_group_id,
@ch = conversation_handle,
@messagetypename = message_type_name,
@messagebody = CAST(message_body AS XML)
FROM TargetQueue
), TIMEOUT 60000
IF (@@ROWCOUNT > 0)
BEGIN
PRINT 'Conversation group: ' + CAST(@cg AS NVARCHAR(MAX))
PRINT 'Conversation handle: ' + CAST(@ch AS NVARCHAR(MAX))
PRINT 'Message type: ' + @messagetypename
PRINT 'Message body: ' + CAST(@messagebody AS NVARCHAR(MAX))
END
COMMIT
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
GO
--**************************************************
--* Create a table to store the processed messages
--**************************************************
CREATE TABLE ProcessedMessages
(
ID UNIQUEIDENTIFIER NOT NULL,
MessageBody XML NOT NULL,
ServiceName NVARCHAR(MAX) NOT NULL
)
GO
--*******************************************************************
--* Send a response message back to the service "InitiatorService"
--*******************************************************************
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @messagetypename NVARCHAR(256)
DECLARE @messagebody XML
DECLARE @responsemessage XML;
BEGIN TRY
BEGIN TRANSACTION
WAITFOR (
RECEIVE TOP (1)
@ch = conversation_handle,
@messagetypename = message_type_name,
@messagebody = CAST(message_body AS XML)
FROM TargetQueue
), TIMEOUT 60000
IF (@@ROWCOUNT > 0)
BEGIN
IF (@messagetypename = 'http://ssb.csharp.at/SSB_Book/c03/RequestMessage')
BEGIN
-- Store the received request message in a table
INSERT INTO ProcessedMessages (ID, MessageBody, ServiceName) VALUES (NEWID(), @messagebody, 'TargetService')
-- Construct the response message
SET @responsemessage = '<HelloWorldResponse>' + @messagebody.value('/HelloWorldRequest[1]', 'NVARCHAR(MAX)') + '</HelloWorldResponse>';
-- Send the response message back to the initiating service
SEND ON CONVERSATION @ch MESSAGE TYPE [http://ssb.csharp.at/SSB_Book/c03/ResponseMessage] (@responsemessage);
-- End the conversation on the target's side
END CONVERSATION @ch;
END
END
COMMIT
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
GO
--********************************************************************
--* View the sent message on the queue "InitiatorQueue"
--********************************************************************
SELECT * FROM InitiatorQueue
GO
--********************************************************************
--* View the processed message in the table "ProcessedMessages"
--********************************************************************
SELECT * FROM ProcessedMessages
GO
--*******************************************************************
--* Service program for the service "InitiatorService"
--*******************************************************************
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @messagetypename NVARCHAR(256)
DECLARE @messagebody XML;
BEGIN TRY
BEGIN TRANSACTION
WAITFOR (
RECEIVE TOP (1)
@ch = conversation_handle,
@messagetypename = message_type_name,
@messagebody = CAST(message_body AS XML)
FROM InitiatorQueue
), TIMEOUT 60000
IF (@@ROWCOUNT > 0)
BEGIN
IF (@messagetypename = 'http://ssb.csharp.at/SSB_Book/c03/ResponseMessage')
BEGIN
-- Store the received response) message in a table
INSERT INTO ProcessedMessages (ID, MessageBody, ServiceName) VALUES (NEWID(), @messagebody, 'InitiatorService')
END
IF (@messagetypename = 'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog')
BEGIN
-- End the conversation on the initiator's side
END CONVERSATION @ch;
END
END
COMMIT
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
GO
--***********************************************************************************
--* Endless receive loop for processing incoming messages on the initiator's queue
--***********************************************************************************
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @messagetypename NVARCHAR(256)
DECLARE @messagebody XML;
WHILE (1=1)
BEGIN
BEGIN TRY
BEGIN TRANSACTION
WAITFOR (
RECEIVE TOP (1)
@ch = conversation_handle,
@messagetypename = message_type_name,
@messagebody = CAST(message_body AS XML)
FROM InitiatorQueue
), TIMEOUT 60000
IF (@@ROWCOUNT = 0)
BEGIN
ROLLBACK TRANSACTION
BREAK
END
IF (@messagetypename = 'http://ssb.csharp.at/SSB_Book/c03/ResponseMessage')
BEGIN
-- Store the received response) message in a table
INSERT INTO ProcessedMessages (ID, MessageBody, ServiceName) VALUES (NEWID(), @messagebody, 'InitiatorService')
END
IF (@messagetypename = 'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog')
BEGIN
-- End the conversation on the initiator's side
END CONVERSATION @ch;
END
COMMIT TRANSACTION
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
END
GO
--********************************************************************************
--* Endless receive loop for processing incoming messages on the target's queue
--********************************************************************************
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @messagetypename NVARCHAR(256)
DECLARE @messagebody XML
DECLARE @responsemessage XML;
WHILE (1=1)
BEGIN
BEGIN TRY
BEGIN TRANSACTION
WAITFOR (
RECEIVE TOP (1)
@ch = conversation_handle,
@messagetypename = message_type_name,
@messagebody = CAST(message_body AS XML)
FROM TargetQueue
), TIMEOUT 60000
IF (@@ROWCOUNT = 0)
BEGIN
ROLLBACK TRANSACTION
BREAK
END
IF (@messagetypename = 'http://ssb.csharp.at/SSB_Book/c03/RequestMessage')
BEGIN
-- Store the received request message in a table
INSERT INTO ProcessedMessages (ID, MessageBody, ServiceName) VALUES (NEWID(), @messagebody, 'TargetService')
-- Construct the response message
SET @responsemessage = '<HelloWorldResponse>' + @messagebody.value('/HelloWorldRequest[1]', 'nvarchar(max)') + '</HelloWorldResponse>';
-- Send the response message back to the initiating service
SEND ON CONVERSATION @ch MESSAGE TYPE [http://ssb.csharp.at/SSB_Book/c03/ResponseMessage] (@responsemessage);
-- End the conversation on the target's side
END CONVERSATION @ch;
END
IF (@messagetypename = 'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog')
BEGIN
-- End the conversation
END CONVERSATION @ch;
END
COMMIT TRANSACTION
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
END
GO
--**********************************************************
--* Error handling with a savepoint on the target's queue
--**********************************************************
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @messagetypename NVARCHAR(256)
DECLARE @messagebody XML
DECLARE @responsemessage XML;
WHILE (1=1)
BEGIN
BEGIN TRANSACTION
WAITFOR (
RECEIVE TOP (1)
@ch = conversation_handle,
@messagetypename = message_type_name,
@messagebody = CAST(message_body AS XML)
FROM TargetQueue
), TIMEOUT 60000
IF (@@ROWCOUNT = 0)
BEGIN
ROLLBACK TRANSACTION
BREAK
END
SAVE TRANSACTION MessageReceivedSavepoint
IF (@messagetypename = 'http://ssb.csharp.at/SSB_Book/c03/RequestMessage')
BEGIN
BEGIN TRY
-- Store the received request message in a table
INSERT INTO ProcessedMessages (ID, MessageBody, ServiceName) VALUES (NEWID(), @messagebody, 'TargetService')
-- Construct the response message
SET @responsemessage = '<HelloWorldResponse>' + @messagebody.value('/HelloWorldRequest[1]', 'nvarchar(max)') + '</HelloWorldResponse>';
-- Send the response message back to the initiating service
SEND ON CONVERSATION @ch MESSAGE TYPE [http://ssb.csharp.at/SSB_Book/c03/ResponseMessage] (@responsemessage);
-- End the conversation on the target's side
END CONVERSATION @ch;
END TRY
BEGIN CATCH
IF (ERROR_NUMBER() = 1205)
BEGIN
-- A deadlock occurred.
-- We can try it again...
ROLLBACK TRANSACTION
CONTINUE
END
ELSE
BEGIN
-- A other error occurred.
-- The message can't be processed successfully, because it's a poison message
ROLLBACK TRANSACTION MessageReceivedSavepoint
PRINT 'Error occured: ' + CAST(@messagebody AS NVARCHAR(MAX))
END
END CATCH
END
IF (@messagetypename = 'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog')
BEGIN
-- End the conversation
END CONVERSATION @ch;
END
COMMIT TRANSACTION
END
GO
--**************************************
--* Poison messages in Service Broker
--**************************************
-- Reactivating the queue
ALTER QUEUE TargetQueue WITH STATUS = ON
GO
-- Service program for handling the poison message
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @messagetypename NVARCHAR(256)
DECLARE @messagebody XML
WHILE (1=1)
BEGIN
BEGIN TRANSACTION
WAITFOR (
RECEIVE TOP (1)
@ch = conversation_handle,
@messagetypename = message_type_name,
@messagebody = CAST(message_body AS XML)
FROM TargetQueue
), TIMEOUT 60000
IF (@@ROWCOUNT = 0)
BEGIN
ROLLBACK TRANSACTION
BREAK
END
-- Rollling back the current transaction
PRINT 'Rollback the current transaction - simulating a poison message...'
ROLLBACK TRANSACTION
END
GO
--**********************************************************
--* Setting up the event notification for poison messages
--**********************************************************
-- Create the queue which stores the event notification messages
CREATE QUEUE PoisonMessageNotifyQueue
GO
-- Create the service that accepts the event notification messages
CREATE SERVICE PoisonMessageNotifyService ON QUEUE PoisonMessageNotifyQueue
(
[http://schemas.microsoft.com/SQL/Notifications/PostEventNotification]
);
GO
-- Create the event notification itself
CREATE EVENT NOTIFICATION PoisonMessageNotification ON QUEUE TargetQueue
FOR Broker_Queue_Disabled
TO SERVICE 'PoisonMessageNotifyService', 'current database'
GO
-- Select the received event notification message
SELECT * FROM PoisonMessageNotifyQueue
GO
--**********************************************************
--* End an conversation with an error
--**********************************************************
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @messagetypename NVARCHAR(256)
DECLARE @messagebody XML
BEGIN TRY
BEGIN TRANSACTION
WAITFOR (
RECEIVE TOP (1)
@ch = conversation_handle,
@messagetypename = message_type_name,
@messagebody = CAST(message_body AS XML)
FROM TargetQueue
), TIMEOUT 60000
IF (@messagetypename = 'http://ssb.csharp.at/SSB_Book/c03/RequestMessage')
BEGIN
-- End the conversation with an error
END CONVERSATION @ch WITH ERROR = 4242 DESCRIPTION = 'My custom error message'
END
COMMIT
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
GO
-- Table that stores error information
CREATE TABLE ErrorLog
(
ID UNIQUEIDENTIFIER NOT NULL,
ErrorCode INT NOT NULL,
ErrorMessage NVARCHAR(MAX) NOT NULL
)
GO
-- Service program for the InitiatorService, that handles also error message types
DECLARE @ch UNIQUEIDENTIFIER
DECLARE @messagetypename NVARCHAR(256)
DECLARE @messagebody XML
DECLARE @errorcode INT
DECLARE @errormessage NVARCHAR(3000);
BEGIN TRY
BEGIN TRANSACTION
WAITFOR (
RECEIVE TOP(1)
@ch = conversation_handle,
@messagetypename = message_type_name,
@messagebody = CAST(message_body AS XML)
FROM InitiatorQueue
), TIMEOUT 60000
IF (@@ROWCOUNT > 0)
BEGIN
IF (@messagetypename = 'http://ssb.csharp.at/SSB_Book/c03/ResponseMessage')
BEGIN
-- Store the received response) message in a table
INSERT INTO ProcessedMessages (ID, MessageBody, ServiceName) VALUES (NEWID(), @messagebody, 'InitiatorService')
END
IF (@messagetypename = 'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog')
BEGIN
-- End the conversation on the initiator's side
END CONVERSATION @ch;
END
IF (@messagetypename = 'http://schemas.microsoft.com/SQL/ServiceBroker/Error')
BEGIN
-- Extract the error information from the sent message
SET @errorcode = (SELECT @messagebody.value(
N'declare namespace brokerns="http://schemas.microsoft.com/SQL/ServiceBroker/Error";
(/brokerns:Error/brokerns:Code)[1]', 'int'));
SET @errormessage = (SELECT @messagebody.value(
'declare namespace brokerns="http://schemas.microsoft.com/SQL/ServiceBroker/Error";
(/brokerns:Error/brokerns:Description)[1]', 'nvarchar(3000)'));
-- Log the error
INSERT INTO ErrorLog(ID, ErrorCode, ErrorMessage)
VALUES (NEWID(), @errorcode, @errormessage)
-- End the conversation on the initiator's side
END CONVERSATION @ch;
END
END
COMMIT
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
GO