Object based databases tutorial learn the concepts of object based databases with this easy and complete object based databases tutorial. Query language approach based on the deductive object. A database system that supports an objectoriented data model would. A query language for manipulating objectoriented databases. Object oriented databases treat each entity as a distinct object. A significant sub set of the model has been cast into a query language which is supported in the orion objectoriented database sys tem. An introduction to objectoriented databases and database.
For example, a functional query language lends itself to functional optimization. You can use a database such as mysql in an object oriented manner from your code using an orm object relational mapping library. The reader will gain insight into databases, data models, oodb architecture, object query. An object oriented database is a collection of object oriented programming and relational database. No prior knowledge of databases is assumed for the relational database talk, and. Oql creates and manipulates objects without explicitly. Section 6 presents the formal syntax and semantics. Probably the main difference is that o2 supports queries. The queries that youll be creating will look very similar to that of sql.
This tutorial discusses the concept, models, features of object oriented databases with examples. We present a rulebased query language called oql ob ject query language based on the data model. A model of queries for objectoriented databases citeseerx. Goql, a graphical query language for object oriented database systems. Object oriented database systems carry information in the form of objects.
Myoodb is a database, web and application framework. Relational database still is the majority of persistence mechanism. Query language approach based on the deductive objectoriented database paradigm article in information and software technology 4211. An cql query is considered as a function, which when applied to a database, returns a. An assembly composed of several parts, therefore, can refer directly to its components instead of explicitly associating some. The standard programming interface to database is sql, which was originally. Extends objectoriented programming lan guage with database capabilities. A data model and a query language for objectoriented databases.
Object oriented databases, then, are an attempt to solve the problems mentioned as well as others and still maintain the advantages of database systems. In order to perform queries, youll need to enter query mode. Objectrelational developers guide 11g release 1 11. We first discuss the general problem of designing such a language. The talks are intended as onehour introductions for an audience of computer professionals, assumed to be technically competent but not familiar with the topics discussed. Semantic modeling of object oriented databases mokrane bouzeghoub, elisabeth mttais laboratoire max, universite p. A gentle introduction to relational and object oriented. Discover book depositorys huge selection of objectoriented databases books online. Query processing in objectoriented database systems.