A message selector allows a JMS consumer to specify which messages it wants to receive by using message headers and properties as criteria in conditional expressions. MDB works as a message consumer and it works according to the message selector definition. It is based on a subset of the SQL-92 conditional expression syntax, which is used in the WHERE clauses of SQL statements. For example, a simple message selector like ProcessId = 54 will receive all messages that have a property named ProcessId with the value 54.
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