ESQL MESSAGE BROKER PDFJune 22, 2020
You can access broker, message flow, and node properties from ESQL, the Mapping node, and Java. The following guidelines should be used when constructing the ESQL files that implement a WebSphere Message Broker application. The logical tree structure is the internal (broker) representation of a message. ESQL, a programming language that you can code in the Compute, Database.
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For a complete overview of broker properties, see Broker properties.
A fix pack is cumulative: It can be applied on top of any previously-shipped maintenance to bring the system up to the current fix messaage level. WebSphere Message Broker, Version 8. The Java code, where applicable, is shown in the second column of the table. The only broker-defined properties that can be used in a Trace node are those in the “General broker properties” group.
ESQL code conventions in WebSphere Message Broker
For example, you could specify the Pattern setting of a Trace node as: Start Trace Input Message Time: MessageOptions Integer bit 1 Not possible The bit stream and validation options in force. NodeLabel Character Not applicable The name messge the node. TransactionType Character 1 Not possible The type of transaction Automatic or Commit used to access a database from this node. TreatWarningsAsErrors Boolean 1 Not possible Whether database warning messages are treated as errors, and cause the output message to be propagated to the failure terminal.
Not applicable for the DatabaseInput node. BrokerVersion The BrokerVersion property contains a 4-character code that indicates the version of the broker. The VRMF code works like this: V The Version number. A Version is a separate IBM licensed program that usually has significant new code or new function. Each version has its own license, terms, and conditions.
R The Release number.
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A Release is a distribution of new function and authorized program analysis report APAR fixes for an existing product. M The Modification number.
A Modification is new function added to an existing product, and is delivered separately from an announced Version or Release. F The Fix pack number.
Logical tree structure
Fix packs contain defect and APAR fixes. They do not contain new function. Accessing broker properties from ESQL.
Accessing broker properties from the JavaCompute node. Creating a user-defined extension in Java.
ESQL-to-Java data-type mapping table. Java user-defined extensions API. The name of the broker. The user ID under which the broker is running that is, the user ID specified by the -i flag on the mqsicreatebroker command on Windowsor the user ID that started the broker by using the mqsistart command on Linux and UNIX systems.
The 4-character version number of the broker see BrokerVersion.
ESQL Functions and Syntax in Message Broker – Meddileware Courses
The label of the execution group a human-readable name. The name of the execution group typically a UUID identifier. The process identifier PID of the execution group. The name of the WebSphere MQ queue manager to which the broker is connected. To return any non-default workpath in Java, use: Optional The directory in which working files for this broker are stored. The number of additional threads that the broker can use to service the message flow.
The number of input messages that are processed by the eesql flow before a syncpoint is taken. The time interval at which a commit is taken when the CommitCount property is greater than 1 that messags, where the message flow is batching messagesbut the number of messages processed has not reached the value of the CommitCount property. The rsql ID that the broker uses to access the database user tables. MessageOptions Integer bit 1. The bit stream and validation options in force.
The type of node ComputeDatabaseor Filter. Whether the broker generates an exception when a database error is detected. The type of transaction Automatic or Commit used to access a database from this node.
Whether database warning messages are treated as errors, and cause the output message to be propagated to the failure terminal.