【摘要】：SaaS (Software as a Service)是在本世紀(jì)初興起的一種新的軟件服務(wù)模式,與傳統(tǒng)的某一服務(wù)軟件單獨(dú)為某一客戶(用戶)獨(dú)立開發(fā)的服務(wù)方式不同,SaaS服務(wù)提供商需要為服務(wù)的使用者搭建企業(yè)信息化建設(shè)所需要的一切網(wǎng)絡(luò)基礎(chǔ)設(shè)施及軟硬件運(yùn)作平臺,并負(fù)責(zé)SaaS服務(wù)所有前期的實(shí)施工作和后期的維護(hù)工作,這樣不僅大幅降低了企業(yè)信息化建設(shè)的總體投入成本,而且還可使企業(yè)將更多的注意力集中在企業(yè)經(jīng)營目標(biāo)的高價(jià)值活動中去。 SaaS服務(wù)具有服務(wù)在線性、方式靈活性、功能可配置性和屬性可擴(kuò)展性等諸多優(yōu)秀特性,使用戶能夠更加方便、更加快捷地使用軟件服務(wù),并且可以根據(jù)軟件復(fù)雜多變的需求進(jìn)行自配置、業(yè)務(wù)流程重組和服務(wù)整合。SaaS在提供軟件使用方便的同時(shí),本身也有許多需要解決的關(guān)鍵技術(shù)問題。本文主要對SaaS關(guān)鍵技術(shù)中的數(shù)據(jù)存儲模型和模式擴(kuò)展技術(shù)進(jìn)行了深入研究。 本文主要工作如下： 首先,經(jīng)過對傳統(tǒng)的三種數(shù)據(jù)存儲模型的深入研究,針對獨(dú)立數(shù)據(jù)庫和獨(dú)立模式中存在的商戶在定義商品信息時(shí)冗余字段過多、共享程度較低的缺點(diǎn),以及共享數(shù)據(jù)庫共享模式中租戶隔離級別低、數(shù)據(jù)不很安全的不足之處,本文在這里給出了第四種數(shù)據(jù)存儲模型：共享數(shù)據(jù)庫半共享半獨(dú)立模式。在數(shù)據(jù)隔離級別上本模型比共享數(shù)據(jù)庫共享模式存儲模型較高,并且在共享級別上也比共享數(shù)據(jù)庫獨(dú)立模式和獨(dú)立數(shù)據(jù)庫存儲模型高；在論文中本文也詳細(xì)介紹了新數(shù)據(jù)存儲模型的相關(guān)概念,并具體闡述了其實(shí)現(xiàn)過程,并在第三章最后部分對四種數(shù)據(jù)存儲模型進(jìn)行了對比。 同時(shí)在本文中也介紹了在開發(fā)SaaS服務(wù)時(shí)需要使用的六種主要模式擴(kuò)展技術(shù),并詳細(xì)介紹了各自的實(shí)現(xiàn)過程及優(yōu)缺點(diǎn),接下來本文在稀疏列擴(kuò)展技術(shù)和通用表技術(shù)的基礎(chǔ)上提出了一種改進(jìn)版的模式擴(kuò)展技術(shù),它克服了稀疏列技術(shù)和通用表技術(shù)中數(shù)據(jù)表較寬、NULL值較多、浪費(fèi)存儲空間等缺點(diǎn),在第四章的最后本文把新模式擴(kuò)展技術(shù)與文中介紹的六種模式擴(kuò)展技術(shù)進(jìn)行了對比,詳細(xì)地總結(jié)了新模式擴(kuò)展技術(shù)的優(yōu)勢及不足之處。 最后,本文結(jié)合第四章的改進(jìn)版模式擴(kuò)展技術(shù),通過實(shí)驗(yàn)對本文提出的新的數(shù)據(jù)存儲模型與之前的共享數(shù)據(jù)庫獨(dú)立模式和共享數(shù)據(jù)庫共享模式兩種數(shù)據(jù)存儲模型進(jìn)行了服務(wù)性能上的對比,在證明新模型的可用性的同時(shí)也說明了其服務(wù)效果,為今后的相關(guān)技術(shù)的研究進(jìn)展提供了參考,也為SaaS服務(wù)提供商在開發(fā)SaaS服務(wù)時(shí)多提供了一種可選的數(shù)據(jù)存儲模型。
[Abstract]:SaaS (Software as a Service) is a new software service model that emerged in the beginning of this century. The SaaS service provider needs to set up all the network infrastructure and software and hardware operation platform for the users of the service, which is different from the traditional service software which is independently developed for a customer (user), and the service provider needs to build all the network infrastructure and software and hardware operation platform for the users of the service. And responsible for all the early implementation of SaaS services and later maintenance work, which not only significantly reduced the overall cost of enterprise information construction, SaaS services have many excellent features, such as linearity, flexibility of mode, configurable function and attribute extensibility, etc. It enables users to use software services more conveniently and more quickly, and can be self-configured according to the complex and changeable requirements of software. Business process reengineering and service integration. SaaS provides the convenience of software use at the same time, There are also many key technical problems to be solved. In this paper, the data storage model and schema extension technology in the key technologies of SaaS are studied. The main work of this paper is as follows: first of all, through the in-depth study of the traditional three data storage models, there are too many redundant fields in the definition of commodity information in the independent database and independent mode. The disadvantage of low degree of sharing, and the deficiency of low level of tenant isolation and low security of data in shared database sharing mode, this paper gives the fourth data storage model: shared database semi-shared semi-independent mode. In the data isolation level, the model is higher than the shared database shared mode storage model, and in the sharing level, it is also higher than the shared database independent schema and independent database storage model. In this paper, the concepts of the new data storage model are also introduced in detail, and the implementation process is described in detail. In the last part of chapter 3, the four data storage models are compared. At the same time, this paper also introduces six kinds of main mode extension technologies that need to be used in developing SaaS services, and introduces their implementation process, advantages and disadvantages in detail. Then, based on the sparse column extension technology and the general table technology, an improved schema extension technology is proposed, which overcomes the shortcomings of the sparse column technology and the general table technology, such as the wide null value of the data table and the waste of storage space. At the end of chapter 4, this paper compares the new pattern extension technology with the six kinds of pattern extension technology introduced in this paper, and summarizes the advantages and disadvantages of the new pattern extension technology in detail. Finally, this paper combined with the improved version of the fourth chapter of the mode extension technology, The service performance of the new data storage model proposed in this paper is compared with the shared database independent model and the shared database sharing model. The availability of the new model is proved, and the service effect is also explained, which provides a reference for the research progress of related technologies in the future, and also provides an optional data storage model for SaaS service providers when developing SaaS services.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP393.09;TP333

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