8.7. Message selectors
JMS provides facilities to query the messages on a queue so that a subset of the messages can be selected based on a given criteria. This can be thought of as a SQL query facility in databases. In fact the syntax for such a search is based on SQL92 standards for conditional expressions. A message selector is a string containing a conditional expression. The message selector can refer to fields in the JMS message header as well as fields in the message properties that are application-defined fields.
The order of evaluation of a message selector is from left to right within precedence level. You can use parentheses to change the order of evaluation. The selector literals and operator names are case sensitive.
A selector ...
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