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| Title: | 以XML資料庫為儲存體的Java永續物件之研究
Persistent Java Data Objects on XML Databases |
| Authors: | 侯語政
Hou, Yu-Cheng |
| Contributors: | 陳正佳
Chen, Cheng-Chia
侯語政
Hou, Yu-Cheng |
| Keywords: | XML資料庫
永續
Native XML Database
Java Data Objects
persistence
JDO |
| Date: | 2004 |
| Issue Date: | 2009-09-18 18:26:27 (UTC+8) |
| Abstract: | 物件永續化是應用系統設計時經常會面臨的需求，傳統做法是由開發人員自行設法將物件轉為資料庫可接受的格式，再存入後端資料庫。但這往往使得開發人員必須同時處理兩種資料模型，除了應用系統所用的物件模型之外，開發人員還要處理後端資料庫所用的資料模型，譬如表格等，以及兩種模型間的轉換。這不僅增加系統開發的複雜度，維護系統亦不容易。新的資料永續性技術Java資料物件（JDO）提供一個標準的框架，能夠幫助開發人員代為處理物件永續化的問題。因此開發人員能夠以單純的物件模型發展應用系統。另一方面，XML技術的興起帶動XML文件在資料交換與儲存方面的加速發展，其中專門儲存XML文件的資料庫也日益普遍。我們的研究是在瞭解如何使用XML資料庫為後端的資料儲存庫，而對Java物件進行物件永續化。
Object persistence often comes up at the development of the application systems. Traditionally, the developers should try to transfer the objects to forms that databases can accept, and then store them in databases. But this often makes developers deal with two kinds of data models at the same time: besides object model that the application usually uses, the developers should also deal with the data model used for the backend database, like the relation model, and the conversion between both models. This not only increases the complexity of the system, but also the difficulty to maintain the system. A new technology of object persistence is Java Data Objects (JDO), which offer a standard framework to help developers to deal with object persistence so that the developers can concern themselves with object model only. On the other hand, the rise of XML technologies makes it attractive in data exchange and storage. The use of XML databases as data repositories becomes more and more common. Our research in the thesis is to realize JDO by serializing Java objects as XML documents and use XML databases as persistent repositories to store the resulting documents.
第一章 緒 論 1
1.1 研究動機 1
1.2 研究目的 2
1.3 詞彙定義 4
1.4 論文架構 4
第二章 相關技術探討 5
2.1 資料儲存庫 5
2.1.1 關聯式資料庫 6
2.1.2 物件導向資料庫 9
2.1.3 原生XML資料庫 10
2.1.4 資料庫比較 11
2.2 資料永續性技術 12
2.2.1 序列化 13
2.2.2 Java資料庫連通性（JDBC） 13
2.2.3 Enterprise JavaBeans（EJB） 14
2.2.4 Java資料物件（JDO） 15
2.2.5 資料永續性技術比較 17
第三章 系統架構 19
3.1 JDO系統環境 19
3.1.1 JDO運作環境 19
3.1.2 增強模式（Enhancement） 20
3.1.3 JDO架構 24
3.2 JBoX架構 26
3.2.1 Metadata/Model Descriptor（MMD）組件 27
3.2.2 Query Language Transformer（QLT）組件 28
3.2.3 Namespace Transformer（NST）組件 28
3.2.4 Binding Object to XML（BOX）組件 30
3.2.5 Persistence Manager（PM）組件 30
3.2.6 State Manager（SM）組件 31
3.2.7 Store Manager（SRM）組件 31
3.2.8 Extent組件 31
3.2.9 Query組件 32
3.2.10 Transaction（TX）組件 32
3.2.11 XML Manager（XM）組件 32
第四章 系統實作 37
4.1 物件與XML文件映射 37
4.1.1 JBoX儲存格式–Extended XMI 37
4.1.2 映射方法 39
4.1.3 物件與XML文件之映射 44
4.2 查詢語言轉換 49
4.2.1 資料設定 50
4.2.2 候選類別轉換 51
4.2.3 邏輯判斷與數值計算表達式轉換 51
4.2.4 欄位轉換 53
4.2.5 方法轉換 54
4.2.6 參數與變數轉換 56
4.2.7 排序轉換 57
4.3 系統測試 57
第五章 結論與未來研究方向 61
5.1 結論 61
5.2 未來研究方向 62
參考文獻 63 |
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| Description: | 碩士
國立政治大學
資訊科學學系
90753014
93 |
| Source URI: | http://thesis.lib.nccu.edu.tw/record/#G0090753014 |
| Data Type: | thesis |
| Appears in Collections: | [資訊科學系] 學位論文
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