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  • Book Overview & Buying Getting Started with Oracle Event Processing 11g
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Getting Started with Oracle Event Processing 11g

Getting Started with Oracle Event Processing 11g

By : Alexandre Alves, Lloyd Williams, Robin J. Smith
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Getting Started with Oracle Event Processing 11g

Getting Started with Oracle Event Processing 11g

4 (4)
By: Alexandre Alves, Lloyd Williams, Robin J. Smith

Overview of this book

Events are everywhere, events which can have positive or negative impacts on our lives and important business decisions. These events can impact a company's success, failure, and profitability. Technology now allows people from all walks of life to create Event Driven applications that will immediately and completely respond to the events that affect you and your business. So you are much more responsive to your customers, and competitive threats, and can take advantage of transient time sensitive situations. "Getting Started with Oracle Event Processing" will let you benefit from the skills and years of experience from the original pioneers who were the driving force behind this immensely flexible, complete, and award winning Event Stream Processing technology. It provides all of the information needed to rapidly deliver and understand Event Driven Architecture (EDA) Applications. These can then be executed on the comprehensive and powerful integral Java Event Server platform which utilizes the hardware and operating system.After an introduction into the benefits and uses of Event Stream Processing, this book uses tutorials and practical examples to teach you how to create valuable and rewarding Event Driven foundational applications. First you will learn how to solve Event Stream Processing problems, followed by the fundamentals of building an Oracle Event processing application in a step by step fashion. Exciting and unique topics are then covered: application construction, the powerful capabilities of the Oracle Event Processing language, CQL, monitoring and managing these applications, and the fascinating domain of real-time Geospatial Movement Analysis. Getting Started with Oracle Event Processing will provide a unique perspective on product creation, evolution and a solid understanding on how to effectively use the product.
Table of Contents (19 chapters)
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Getting Started with Oracle Event Processing 11g
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
1
Index

Blending CQL and Java


We explore the CQL and Java integration by walking through several scenarios. Let's start with a simple scenario, where we want to get a sub-string from the symbol event property, whose type is the CHAR native type. This is illustrated in the following example:

SELECT symbol.substring(0,2)
FROM marketFeed

First, CQL performs an implicit conversion between the CQL native CHAR data type and the Java String class. Next, you can invoke an instance method of a Java class instance in CQL by using the . (dot) operator, very much like you would do normally in Java. In other words, the expression symbol.substring(…) invokes the method String java.lang.String.substring(intbeginIndex, intendIndex) in the object represented by the property symbol. You can even go further, and nest invocations as in the following example:

SELECT symbol.substring(0,2).toUpperCase()
FROM marketFeed

In this case, you first invoke the substring() method, and then invoke the toUpperCase() method in the returning...

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