MQSeries programming patterns by Mark Perry; International Business Machines Corporation.; et

By Mark Perry; International Business Machines Corporation.; et al

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This can be done with the MQDISC call. MQDISC (Hconn, CompCode, Reason) 40 MQSeries Programming Patterns For this call you must provide the connection handle to the queue manager. After the execution of this call, the connection handle will have an MQHC_UNUSABLE_HCONN. 6 Putting messages in a queue To put a message in a queue the MQI API gives the programmer two options: Put multiple messages to an already open queue. Put a single message to a queue without having to explicitly open it. To put multiple messages in a queue we can use the MQPUT call: MQPUT (Hconn, Hobj, MsgDesc, PutMsgOpts, BufferLength, Buffer,CompCode, Reason) This call receives: A connection handle, as returned by the MQCONN call (in CICS on MVS/ESA and AS/400 applications, it can also be the MQHC_DEF_HCONN constant).

DynamicQName, “SampleDQ*“); // Setting Open Options O_options = MQOO_INPUT_AS_Q_DEF + MQOO_FAIL_IF_QUIESCING; // Opening the assigned object MQOPEN(Hcon, &od, O_options, &Hobj, &CompCode, &Reason); /* open queue for input /* but not if MQM stopping */ */ /* connection handle /* object descriptor for queue /* open options /* object handle /* completion code /* reason code */ */ */ */ */ */ // Here we use the reason code instead of the CompCode to show how // this parameter can also be used to determine if any problem has occurred.

Using the MQMD structure version 2, it is also possible to declare which fields to use during the queue scan. CorrelId)); MQGET(Hcon, Hobj, &md, &gmo, buflen, buffer, &messlen, &CompCode, &Reason); /* /* /* /* /* /* /* /* /* connection handle object handle message descriptor get message options buffer length message buffer message length completion code reason code */ */ */ */ */ */ */ */ */ The queues have some indexing capabilities to increase the performance of these operations. The index field can be either MsgId or CorrelId, depending on the value of the indexType attribute of the queue.

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