Book Image

Applying and Extending Oracle Spatial

Book Image

Applying and Extending Oracle Spatial

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
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Table Comparing Simple Feature Access/SQL and SQL/MM–Spatial
Index

Summary


The thrust of this chapter has been to show, in a step-by-step manner, how existing open source Java-based algorithms and solutions can be made available to enhance or compliment Oracle SDO_GEOMETRY based processing. The reasons why recourse to Java-based stored procedures should be considered were covered. The following were identified as the chief criteria for determining a core Java platform on which to build functionality, with JTS Topology Suite being chosen:

  • Common geometry type hierarchy

  • Conversion methods

  • A source of quality existing spatial algorithms

You were then shown how to download, compile, package, and load the required JTS source code into the Oracle database. Source code-based class development was covered as was the creating and loading via a single JAR file JTS. A PL/SQL package called SPatialEXtension (SPEX) was created that provided SQL access to the Java classes in the jar file. A number of JASPA and JTS based functions were documented with examples of how to use...