Copyright © TIBCO Software Inc. All Rights Reserved
Copyright © TIBCO Software Inc. All Rights Reserved


Chapter 8 Using Expressions and Operators : Overview

Overview
TIBCO Object Service Broker UI
This chapter describes how to perform various tasks in TIBCO Object Service Broker using the text-based workbench. You can also perform these tasks using the TIBCO Object Service Broker UI, which provides a graphical environment for TIBCO Object Service Broker development. For information about using the TIBCO Object Service Broker UI, refer to the TIBCO Object Service Broker UI online help.
What Comprises an Expression?
An expression is any combination of values and operators (such as + or -), which results in a single value when evaluated. Conditions, actions, and exception handlers can contain expressions.
Valid Values for Expressions
The values of an expression can consist of a:
Examples of Expressions
 
Operations That Can be Performed With Expressions
Expressions can be compared to each other using relational operators—these are called compound expressions. Compound expressions can be combined using logical operators.
The logical operators AND (&) OR (|) are allowed only within selection criteria (WHERE clause). The NOT (¬) operator is allowed within rules conditions and within selection criteria. Expressions can also be assigned to local variables or fields of tables with the assignment operator.
The Reserved Word NULL
The reserved word NULL is used to represent a null value. It can be used in many of the same places that an expression can be used. For more information about nulls, refer to Chapter 11, Null Processing.

Copyright © TIBCO Software Inc. All Rights Reserved
Copyright © TIBCO Software Inc. All Rights Reserved