SSB(SQLservice Service Broker) 入門實例介紹
step 1：perpar database & data
use master
go
Create database Inventory
go
use Inventory
go
Create table inventory
(
TitleId nvarchar(6) not null,
Quantity int not null,
primary key (TitleId,Quantity)
);
go
insert inventory values ('pc1001',100);
insert inventory values ('pc1002',200);
insert inventory values ('pc1003',300);
insert inventory values ('pc1004',400);
首先創(chuàng)建信息類型
Create Message Type [//mark/v10/types/inventory]
Create Message Type [//mark/v10/types/inventoryresponse]
創(chuàng)建合約
Create contracts [//mark/v10/contracts/inventorycontract]
(
[//mark/v10/types/inventory] send by initiator,
[//mark/v10/types/inventoryresponse] send by target
);
create queue [inventory client queue];
create service [//mark/v10/services/inventory client]
on queue [inventory client queue] go
--create inventory service
create queue [inventory queue];
create service [//mark/v10/services/inventory]
on queue [inventory queue]
(
[//mark/v10/contracts/inventorycontract]
);
use Inventory
go
--send message
begin transaction
declare @dialog_id uniqueidentifier
begin dialog conversation @dialog_id
from service [//mark/v10/services/inventory client]
to service '//mark/v10/services/inventory'
on contract [//mark/v10/contracts/inventorycontract]
with encryption = off;
send on conversation @dialog_id message type [//mark/v10/types/inventory]
(
'<InventoryUpdate>
<TitleId>pc1001</TitleId>
<Quantity>102</Quantity>
</InventoryUpdate>'
);
commit transaction;
發(fā)送成功后，可以查詢 inventory_queue
select conversation_handle, cast(message_body as xml) as conversation_body from [Inventory queue]
這里只是查詢了兩列。
其中conversation_body 就是 我們發(fā)出的信息了。
setp 4: 從 inventory queue 中獲取信息并更新數(shù)據(jù)
use inventory
go
begin transaction
declare @dialog_id uniqueidentifier
declare @message_body xml
declare @amount int;
declare @title nvarchar(128); receive
@dialog_id = conversation_handle,
@message_body = message_body
from [dbo].[Inventory queue] print 'handle is' + cast(@dialog_id as nvarchar(90))
print 'message body is' + cast(@message_body as nvarchar(max) )
if(@dialog_id is not null)
begin
set @amount = @message_body.value('(/InventoryUpdate/Quantity)[1]','int');
set @title = @message_body.value('(/InventoryUpdate/TitleId)[1]','nvarchar(100)');
print 'a:'+cast(@amount as nvarchar(100))
print 'b:'+@title; Update inventory set Quantity = @amount where TitleId = @title;
end
end conversation @dialog_id;
commit transaction;
操作成功后再去查詢inventory queue的表 猶豫里面的數(shù)據(jù)已經(jīng)被receive 出來 就為空了。
數(shù)據(jù)同時被更新了
step 5: 接下來做個自動監(jiān)聽功能，只要有信息發(fā)送到隊列，相關(guān)隊列，就可以自動執(zhí)行功能.
首先建立個存儲過程，（把receive 中的那段代碼拿過來就可以了）
use Inventory
go
--create procedure to receive message and update table
create proc InventoryProc as
begin transaction
declare @dialog_id uniqueidentifier
declare @message_body xml
declare @amount int;
declare @title nvarchar(128);
waitfor(
receive
@dialog_id = conversation_handle,
@message_body = message_body
from [dbo].[Inventory queue]),timeout 5000;
print 'handle is' + cast(@dialog_id as nvarchar(90))
print 'message body is' + cast(@message_body as nvarchar(max) )
if(@dialog_id is not null)
begin
set @amount = @message_body.value('(/InventoryUpdate/Quantity)[1]','int');
set @title = @message_body.value('(/InventoryUpdate/TitleId)[1]','nvarchar(100)');
print 'a:'+cast(@amount as nvarchar(100))
print 'b:'+@title;
Update inventory set Quantity = @amount where TitleId = @title;
end
end conversation @dialog_id;
commit transaction;
go
隊列監(jiān)聽
alter queue [inventory queue]
with activation(
status = on,
procedure_name= InventoryProc,
max_queue_readers=2,
execute as self
); go
完成后，只要發(fā)送隊列信息后，就可以了
PS： 我們定義了 兩個隊列 還有個 inventory client queue
這個隊列保存的是成功或者error 提示。用receive 方法也可以提取出來。
select message_type_name from [Inventory client queue]
以上的 message type service 等信息
如圖所示，都在這里.
以上是SSB的入門實例，以后會再寫一篇實際應(yīng)用上的（以上的sql code 都是純手工輸入，可能還存在錯誤（雖然校驗了兩遍）,如果發(fā)生錯誤，對不起大家了。）
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