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.

This master thesis deals with technologies for persistence of objects in Java. It briefly describes options of persistence of objects into files and further especially modern technologies for persistence of objects into database systems, particularly relational. It describes JDBC technology, framework Hibernate, application interface JDO, SQLJ technology, frameworks OJB and TopLink in detail and briefly the other tools. The emphasis is especially put on their usage, which is illustrated by amount of examples, their properties comparison and recommendation for the application building. The other part of thesis deals with life phases of information system development, where the differences of usage of JDBC and Hibernate, their mutual comparison from different points of view, importance of software architecture and design patterns for the application development in J2EE are presented.

The objective of this work is to design and implement an Object-relational framework for PHP. This framework will be able to map objects to traditional relational database tables. In this work, an appropriate solution of  metadata specification is presented. These metadata describe how an object can be store in a relational database. The framework itself is able to store, load and query any object data in relational database. This object-relational framework has been designed for simple portability among various database systems.

iTrak is a combined mobile and web application that takes advantage of the GPS to allow travelers to share their experience while travelling. The application gathers GPS data and broadcasts it via a web interface or social networks such as Facebook to update user’s status during a trip. iTrak is also equipped with other features such as writing notes or recording video journals to offer a rich experience and provide an interactive diary, along with a real-time tracking ability, for travelers. / text

The content of this thesis is devided into five parts. Firstly basic principles, data models and some languages of temporal databases are introduced. Next chapter describes ways and techniques for persistent storing of data objects in the programming language Java. Following chapters contain main ideas and key concepts of the Java Data Objects standard, draft for temporal extension of this standard and in the final chapter there are details of the actual implementation.

Diploma thesis deals with the contemporary object-relational mapping (ORM) technologies for Java. It briefly describes also competing technologies for persisting objects in files, object and object-relational databases. However main part of the thesis is the persistence of objects in relational databases using ORM frameworks. The work begins with studying general methods and issues, that these frameworks have to solve. Next, it chooses and deeply describes some ORM frameworks. They are later demonstrated on the demo application. In the following part there is a description of the problems I have been facing during the implementation of the persistence using these frameworks. Finally, there is an evaluation and a comparison of these frameworks.