Apama Documentation : Developing Apama Applications : Developing Apama Applications in EPL : Working with Streams and Stream Queries : Using dynamic expressions in stream queries
Using dynamic expressions in stream queries
 
Behavior of static and dynamic expressions in stream queries
When to avoid dynamic expressions in stream queries
Ordering and side effects in stream queries
Understanding when the correlator evaluates particular expressions
Examples of using dynamic expressions in stream queries
The expressions in stream queries can contain variables and action calls from EPL. Unlike parameters to event templates, the correlator evaluates these expressions each time the query is used and not just when it is created. This allows the behavior of the query to be altered during program execution.
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