这篇文章主要为大家详细介绍了SSB(SQLservice Service Broker) 入门实例介绍,具有一定的参考价值,可以用来参考一下。
感兴趣的小伙伴,下面一起跟随四海网的小编两巴掌来看看吧!
step 1:perpar database & data
代码如下:
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);
首先创建信息类型
代码如下:
Create Message Type [//mark/v10/types/inventory]
Create Message Type [//mark/v10/types/inventoryresponse]
代码如下:
Create contracts [//mark/v10/contracts/inventorycontract]
(
[//mark/v10/types/inventory] send by initiator,
[//mark/v10/types/inventoryresponse] send by target
);
代码如下:
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]
);
代码如下:
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;
代码如下:
select conversation_handle, cast(message_body as xml) as conversation_body from [Inventory queue]
setp 4: 从 inventory queue 中获取信息并更新数据
代码如下:
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;
数据同时被更新了
【图片暂缺】
step 5: 接下来做个自动监听功能,只要有信息发送到队列,相关队列,就可以自动执行功能.
首先建立个存储过程,(把receive 中的那段代码拿过来就可以了)
代码如下:
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
代码如下:
alter queue [inventory queue]
with activation(
status = on,
procedure_name= InventoryProc,
max_queue_readers=2,
execute as self
);
go
PS: 我们定义了 两个队列 还有个 inventory client queue
这个队列保存的是成功或者error 提示。用receive 方法也可以提取出来。
代码如下:
select message_type_name from [Inventory client queue]
【图片暂缺】
以上的 message type service 等信息 【图片暂缺】 如图所示,都在这里.
以上是SSB的入门实例,以后会再写一篇实际应用上的(以上的sql code 都是纯手工输入,可能还存在错误(虽然校验了两遍),如果发生错误,对不起大家了。)
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关键词:SQL SERVER
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