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


This chapter has been an introduction to the basics of programming new functionality based on the SDO_GEOMETRY data type's attributes and methods. New functions were created that showed you how to interpret and manipulate the SDO_ELEM_INFO and SDO_ORDINATES attributes both alone and together using SQL and PL/SQL.

New functionality is often built on top of existing or new functions. Such functionality needs to be organized so that it is understandable, maintainable, and accessible. This chapter therefore introduced different methods for packaging such functionality with an emphasis on the use of an object type called T_GEOMETRY. The chapter concluded with some practical functions for sorting and vectorizing geometries.

In Chapter 7, Editing, TransForming, and Constructing Geometries, everything learned in this chapter will be used when building more advanced functions For editing, converting, and transforming the SDO_GEOMETRY data.