Book Image

Applying and Extending Oracle Spatial

By : Siva Ravada, Simon Greener
Book Image

Applying and Extending Oracle Spatial

By: Siva Ravada, Simon Greener

Overview of this book

Spatial applications should be developed in the same way that users develop other database applications: by starting with an integrated data model in which the SDO_GEOMETRY objects are just another attribute describing entities and by using as many of the database features as possible for managing the data. If a task can be done using a database feature like replication, then it should be done using the standard replication technology instead of inventing a new procedure for replicating spatial data. Sometimes solving a business problem using a PL/SQL function can be more powerful, accessible, and easier to use than trying to use external software. Because Oracle Spatial's offerings are standards compliant, this book shows you how Oracle Spatial technology can be used to build cross-vendor database solutions. Applying and Extending Oracle Spatial shows you the clever things that can be done not just with Oracle Spatial on its own, but in combination with other database technologies. This is a great resource book that will convince you to purchase other Oracle technology books on non-spatial specialist technologies because you will finally see that "spatial is not special: it is a small, fun, and clever part of a much larger whole".
Table of Contents (20 chapters)
Applying and Extending Oracle Spatial
About the Authors
About the Reviewers
Table Comparing Simple Feature Access/SQL and SQL/MM–Spatial

Constructing cross-database SQL

Constructing SQL that can run across multiple database vendor databases is a design goal for a lot of applications in the hope that their development investment can create better return on investment through streamlined porting and reducing maintenance. The goal of standards (whether SQLMM, OGC SFA or SQL92) is to facilitate the achievement of these design goals. The presentation of the SQL/MM geometry type hierarchy and function set in this chapter is to introduce the only foundation that exists to support cross-platform spatial SQL today. But, as we shall see, nothing is perfect.

Is database independence possible?

It is common to meet developers and architects who believe that the only sound approach to using a database is to aim for database independence. That is, that all application database logic must be implemented such that it can run on any database vendor's product.

As Thomas Kyte observed in his book, Effective Oracle by Design.

Many times, people approach...