Selecting messages from queues

Selecting messages from queues

We can select messages from queues using the MsgId and CorrelId fields on an MQGET call, or by using a SelectionString on an MQOPEN or MQSUB call.

Selectors
A message selector is a variable-length string used by an application to register its interest in only those messages that have properties that satisfy the Structured Query Language (SQL) query that the selection string represents.
Selection behavior
Overview of IBM MQ selection behavior.
Message selector syntax
An IBM MQ message selector is a string with syntax that is based on a subset of the SQL92 conditional expression syntax.
Selecting on the content of a message
It is possible to subscribe based on a selection of message payload content (also known as content filtering), but the decision about which messages should be delivered to such a subscription cannot be performed directly by IBM MQ; instead an extended message selection provider, for example IBM Integration Bus, is required to process the messages.
Parent topic: IBM MQ messages