| <P>Cayenne defines a simple yet powerful object-based expression language. Cayenne expressions are database independent and are used as query qualifiers and orderings and also to perform in-memory evaluation with DataObjects (and generally any kind of Java Beans). BNF of Cayenne expression language is described <A href="http://objectstyle.org/cayenne/grammar/ExpressionParser.html" class="external-link" rel="nofollow">here</A>.</P> |
| <P>Expressions are broadly divided into the following categories: object property expressions (also called "path expressions"), arithmetic operations, and conditional expressions. Cayenne contains a parser to build expressions from strings, and also features explicit expression API. Various ways of creating and using expressions are described later in this chapter. </P> |
