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SSB(SQLservice Service Broker) 入門實例介紹

更新時間：2013年04月01日 17:15:13 作者：

前兩天用了 MSsql里的 SSB委托機(jī)制，做了一個消息分發(fā)的小功能，在這里簡單跟大家分享一下方法跟實例

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);

step 2: 創(chuàng)建整個SSB的基礎(chǔ)框架.

首先創(chuàng)建信息類型

復(fù)制代碼代碼如下:

Create Message Type [//mark/v10/types/inventory]
Create Message Type [//mark/v10/types/inventoryresponse] 

創(chuàng)建合約

復(fù)制代碼代碼如下:

Create contracts [//mark/v10/contracts/inventorycontract]
( 
    [//mark/v10/types/inventory] send by initiator,
    [//mark/v10/types/inventoryresponse] send by target  
); 

創(chuàng)建隊列與服務(wù)

復(fù)制代碼代碼如下:

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]
    );

step 3：發(fā)送消息到消息隊列中

復(fù)制代碼代碼如下:

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;

發(fā)送成功后，可以查詢 inventory_queue

復(fù)制代碼代碼如下:

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)

復(fù)制代碼代碼如下:

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;

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）

復(fù)制代碼代碼如下:

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

隊列監(jiān)聽

復(fù)制代碼代碼如下:

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。

復(fù)制代碼代碼如下:

select message_type_name from [Inventory client queue]