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Topic: Object database

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Relational database

Database

Flat file database

Persistence

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Java Database Connectivity

Charles Bachman

Java programming language

Database normalization

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Ted Codd

JDBC type 1 driver

	Object database - Wikipedia, the free encyclopedia
		Starting in 2004, object databases have seen a second growth period when open source object databases emerged that were widely affordable and easy to use, because they are entirely written in OOP languages like Java or C#, such as db4o (db4objects) and Perst (McObject).
		Object databases based on persistent programming acquired a niche in application areas such as engineering and spatial databases, telecommunications, and scientific areas such as high energy physics and molecular biology.
		Additionally, object databases lack a formal mathematical foundation, unlike the relational model, and this in turn leads to weaknesses in their query support.
	en.wikipedia.org /wiki/Object_database (1540 words)

	Object-relational mapping - Wikipedia, the free encyclopedia
		Object-Relational mapping (or O/RM), is a programming technique that links databases to object-oriented language concepts, creating (in effect) a "virtual object database." There are both free and commercial packages available that perform object-relational mapping, although some programmers opt to code their own object-relational mapping for their systems.
		The crux of the problem is in translating those objects to forms which can be stored in files or databases, and which can later be retrieved easily while preserving the properties of the objects and their relationships; these objects can then be said to be persistent.
		Using relational databases to store object-oriented data leads to a semantic gap where programmers would be required to allow their software to function in two different worlds — processing of data would be done in object-oriented form, but the same data would have to be stored in relational form.
	en.wikipedia.org /wiki/Object-relational_mapping (1611 words)

	Object Database vs. Object-Relational Databases
		It is this new class of database we want to discuss and contrast with the relational databases from which they are evolving and also with the pure object databases they will never replace.
		The object model used by the Object Database Management Group in its ODMG-93 standard is derived from the OMG Common Object Model, and the model has been supplemented with bindings for C++, Smalltalk, and Java as well as Object Definition Language (ODL, based on OMG's IDL), the aforementioned OQL, meta-object access, and object interchange.
		Although the object database vendors, in general, are in a much better technical position to support the type of extensibility required to build an ecosystem, they can't deliver much market size.
	www.ca.com /products/jasmine/analyst/idc/14821E.htm (8082 words)

	Why Aren't You Using An Object Oriented Database Management System?
		This causes a certain inefficency as objects must be mapped to tuples in the database and vice versa instead of the data being stored in a way that is consistent with the programming model.
		Object oriented programming concepts such as encapsulation, polymorphism and inheritance are enforced as well as database management concepts such as the ACID properties (Atomicity, Consistency, Isolation and Durability) which lead to system integrity, support for an ad hoc query language and secondary storage management systems which allow for managing very large amounts of data.
		Database operations typically involve obtaining a database root from the the OODBMS which is usually a data structure like a graph, vector, hash table, or set and traversing it to obtain objects to create, update or delete from the database.
	www.25hoursaday.com /WhyArentYouUsingAnOODBMS.html (2830 words)

	Interval Software (Site not responding. Last check: 2007-10-22)
		An object-oriented database is a database management system which handles the persistent storage and retrieval of objects.
		Some objects may be as simple as one dimensional records in a relational database, but many objects are complex in nature.
		Object Pascal has a very well designed object model, so Spider Object Database's goal is to provide an object-oriented database system which directly supports Object Pascal.
	www.intervalsoftware.com /odb.html (473 words)

	Frontier: The Object Database
		The object database is at the heart of the Frontier enviroment.
		The basic approach is to specify the full name of the object, with each sub-table of which it is a member appearing in order from the root level down to the object, and each sub-table's name separated from the others by a period.
		Any object whose full name begins with any of these paths will be found if you supply only the remainder of its name (i.e., the part that would be appended to the end of one of these known paths).
	www.scripting.com /frontier/manual/chapter06.html (2781 words)

	Database Models: Hierarcical, Network, Relational, Object-Oriented, Semistructured, Associative and Context.
		This one-to-one mapping of object programming language objects to database objects has two benefits over other storage approaches: it provides higher performance management of objects, and it enables better management of the complex interrelationships between objects.
		In such database there is no clear separation between the data and the schema, and the degree to which it is structured depends on the application.
		Such databases subsume the modelling power of recent extensions of flat relational databases, to nested databases which allow the nesting (or encapsulation) of entities, and to object databases which, in addition, allow cyclic references between objects.
	www.unixspace.com /context/databases.html (2376 words)

	Object Database by Objectivity (Site not responding. Last check: 2007-10-22)
		An object database is defined as a database in which information is represented in the form of objects, rather than records or as tables, rows and columns.
		The objects can be manipulated only by using the methods or functions defined for the class to which the object belongs.
		Objects are organized into a type hierarchy and subtypes inherit the characteristics of their supertypes.
	www.objectivity.com /object-database.shtml (328 words)

	EMBEDDED OBJECT ORIENTED DATABASE SYSTEMS FOR JAVA AND CSHARP (Site not responding. Last check: 2007-10-22)
		Objects are accessed indirectly through an object index (i.e., an array whose elements contain the offset of objects in the file).
		When an object is modified for the first time, it is cloned (a copy of the object is created) and the object handle in the current index is changed to point to the newly-created object copy.
		The indicator of the current index in the database object header is used to determine the index corresponding to the last consistent database state.
	www.garret.ru /~knizhnik/eoodbms.html (9316 words)

	Object Database - InterSystems Caché Object Database
		Caché object database benefits developers by giving them their choice of development tools, programming languages, and methods of database access.
		Object database applications can be designed as though they were a series of static Web pages.
		The Caché object database multidimensional data server eliminates the processing overhead associated with relational technology, resulting in a significant boost in transactional application speed.
	www.alcade.com /database-object.htm (653 words)

	Object database articles
		Object Database Management Systems (ODBMSs) are designed to work well with object programming languages such as C#, C++, and Java.
		If you are interested in a listing of object database products, click here.
		Many of these database concepts apply to all forms of database management systems: relational (RDBMS), object (ODBMS), XML (XDBMS), and others as well as object-relational mapping and XML-mapping products.
	service-architecture.com /object-oriented-databases/articles/index.html (194 words)

	Object Oriented Databases
		Object Oriented databases may be characterized quite simply; they typically represent database systems that integrate tightly with a language with object-oriented features such as
		Thus, once you tie a data structure to the database, you no longer need to be concerned about whether a piece of data is in memory or not; as soon as your program refers to it, the data will be pulled into memory if it is not already there.
		Database server is implemented using multithreaded kernel and provides high concurrency on client requests execution.
	cbbrowne.com /info/oodbms.html (1278 words)

	ONJava.com -- Simple Object Persistence with the db4o Object Database
		However, the interface is complicated by the "impedance mismatch" between the domain object model of the application and the relational model of the database.
		The object model is based on software engineering principles and models the objects in the problem domain, while the relational model is based on mathematical principles and organizes data for efficient storage and retrieval.
		Some solutions to this problem, such as Hibernate and Java Data Objects, are designed to provide the developer with transparent persistence: the application deals with persistent objects using an object-oriented API without the need for SQL code to be embedded in the Java code.
	www.onjava.com /pub/a/onjava/2004/12/01/db4o.html (1245 words)

	Ruby Object Database (Site not responding. Last check: 2007-10-22)
		The Ruby Object Database is not really to be database per se, but rather a set of components that work with each other to allow data to be stored, retrieved, and modified in a way that makes sense for each datatype.
		The datastore mentioned in item 1 is a ruby version of Object Prevalence, which is an object system in-memory whose state is preserved by journalling changes to the object set to file.
		This will allow for data important for an object but not vital to the interconnection between objects to be sent to disk storeage.
	www.nongnu.org /robdb (410 words)

	Object Oriented Database Standards (Site not responding. Last check: 2007-10-22)
		Object Management Group (OMG) - Develops standards to help make object applications to be portable and communicate between each other (interoperability).
		Object Database Management Group (ODMG) - Created to define standard interfaces for object databases.
		The interfaces should allow the databases and applications that use them be portable and communicate between each other.
	www.comptechdoc.org /independent/database/basicdb/dataobstandard.html (129 words)

	JYD Info (Site not responding. Last check: 2007-10-22)
		Object technology means: send a message to an object and it happens.
		Whether the object is currently in primary storage, or where the object is located on the network, should be a problem for runtime software, not for the application.
		The need to explicitly read and write records, to transform records to objects, and to manage the deletion of dead records, is considered to be a hybrid technology: objects on the surface and old procedural programming underneath.
	www.jyd.com /jydinfo.html (302 words)

	Versant (NASDAQ: VSNT), Versant Object Database, Data Management for Complex Applications, e. g. in the field of ...
		Versant's Object Database Technology is used in a wide variety of industries to store and access hierarchical, and graph-oriented data.
		Using the Versant Object Database, customers cut hardware costs, speed and simplify development, significantly reduce administration costs, and deliver products with a strong competitive edge.
		In the background: an object database from Versant.
	www.versant.com (250 words)

	Object-Oriented Database Application Development Course
		Object Database Development: Concepts and Principles, which is aimed at helping students understand how to develop an application using an advanced database system (an object-relational database system, an object-oriented database system, or an active database system).
		Alternatively, any standard introductory database course, but then more time will need to be spent on Sections 4.1, 9.1, 9.5-7, and 10.4-5.
		Translate your object modules into the syntax of a target OODBMS (the correspondence must be clear).
	osm7.cs.byu.edu /CS552/CS552.html (1542 words)

	Object Persistence with the db4o Object Database
		Object Persistence with the db4o Object Database by
		Yes, relational database is not designed for object persistence, serialization is. I see no reason to use relational database for object persistence if serialization can be used to solve the same thing.
		Object databases may, at lower levels, use all sorts of storage methods - direct to filesystems, or even a network (or relational!) database.
	www.theserverside.com /news/thread.tss?thread_id=30353 (4883 words)

	Max Objects Database
		Just as an indication, some objects are listed to be available on Pure Data as well.
		This set of objects is capable of generating an infinite amount of attractors by automatically constructing nonlinear equations.
		These formulas are of the type quadratic and cubic, so their highest term is to the power of two (quadratic) or three (cubic).
	www.maxobjects.com (348 words)

	Amazon.com: Object-Oriented Database Design Clearly Explained (Clearly Explained): Books: Jan L. Harrington (Site not responding. Last check: 2007-10-22)
		However, while most database professionals have had at least some exposure to the basic concepts of object-oriented programming, information relating specifically to object-oriented databases has remained hard to come by.
		As far as a database professional is concerned, data modeling is the art of identifying the entities that must be represented in a database and the relationships among those entities.
		The OO database design is based on the relational model, copied from the book Relational Database Design by the same author.
	www.amazon.com /exec/obidos/tg/detail/-/0123264286?v=glance (1930 words)

	Frontier 5: Object Database Engine
		An object database cell containing a number or a string is stored in the table that contains it, not in a separate chunk on disk, so the storage required for a small object is reasonable.
		The object database is the same structure that Frontier uses as its persistent storage system for scripts.
		The database cribsheet for Frontier users provides a very quick intro, and links to other pages about the object database for more detailed information.
	www.scripting.com /Gimme5/odb (665 words)

	Object Database Podcast
		He created an object database system in Smalltalk called Magma.The Magma website is: http://minnow.cc.gatech.edu/squeak/2665.
		He will show us an object database application he developed and will share some insights on the tool and his ODBMS development experiences.
		This Podcast is dedicated to the development of object database systems.
	odbmsjournal.org (254 words)

	SEDS Messier Database
		During the years from 1758 to 1782 Charles Messier, a French astronomer (1730 - 1817), compiled a list of approximately 100 diffuse objects that were difficult to distinguish from comets through the telescopes of the day.
		It was one of the first major milestones in the history of the discovery of Deep Sky objects, as it was the first more comprehensive and more reliable list: Only four objects were initially missing because of data reduction errors, which could be figured out later though.
		The study of these objects by astronomers has led, and continues to lead, to important, incredible discoveries such as the life cycles of stars, the reality of galaxies as separate 'island universes,' and the possible age of the universe.
	www.seds.org /messier/index.html (1109 words)

	Build an object database
		In this first of two articles, we look at implementing an object database frontend -- that is to say, a database frontend that can automatically map between Java objects and records within a relational database.
		Dropping rapidly to sea level, we have a couple of options for vivisecting the object: reflection allows us to programmatically query the object's public fields, and serialization allows us to automatically encode all the fields of the object.
		This interface describes the backend object database process: storing object fields in a database and retrieving them from the database.
	www.javaworld.com /javaworld/jw-01-2000/jw-01-step.html (995 words)

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