IBM ESQL TUTORIAL PDF

Comment 0. This way, we can decrease the roll-out period of similar pattern projects. I worked on a project where we used Salesforce as a CRM and had many services that needed to connect with it. Each time there is a call to salesforce for fetching sessionID, make another call for the actual business transaction. It is possible to use aggregation even without using MQ. Integration Zone.

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When you create a message flow, you include input nodes that receive the messages and, optionally, output nodes that send out new or updated messages. If required by the processing that must be performed on the message, you can include other nodes after the input node that complete the actions that your applications need.

Some of the built-in nodes enable you to customize the processing that they provide. The Compute , Database , DatabaseInput , and Filter nodes require you to provide a minimum level of ESQL, and you can provide much more than the minimum to control precisely the behavior of each node.

This set of topics discusses ESQL and the ways in which you can use it to customize these nodes. You can use the Mapping node to customize the processing visually. For more information, see Using message maps. ESQL provides a rich and flexible syntax for statements and functions that enable you to check and manipulate message and database content. You can:. The following topics provide more information about these and other tasks that you can perform with ESQL.

Unless otherwise stated, these guidelines apply to messages in all message domains except the BLOB domain, for which you can implement a limited set of actions. The following topics provide additional information specific to the parser that you have specified for the input message:. Most of the examples included in the topics listed previously show parser-independent ESQL. If examples include a reference to MRM, they assume that you have modeled the message in the MRM and that you have set the names of the MRM objects to be identical to the names of the corresponding tags or attributes in the XML source message.

Some examples are also shown for the XML domain. Unless stated otherwise, the principals illustrated are the same for all message domains. For domain-specific information, use the appropriate link in the previous list. This message is provided in XML source format with tags and attributes , see Example message. The example message is shown in the following diagram. You can run samples only when you use the product documentation that is integrated with the IBM Integration Toolkit.

A few other input messages are used to show ESQL that provides function on messages with a structure or content that is not included in the Invoice or Video samples. Where this occurs, the input message is included in the topic that refers to it. For more information, see Using message maps ESQL provides a rich and flexible syntax for statements and functions that enable you to check and manipulate message and database content.

You can: Read the contents of the input message Modify message content with data from databases Modify database content with data from messages Construct new output messages created from all, part, or none of the input message in the Compute node only The following topics provide more information about these and other tasks that you can perform with ESQL. The topics specific to the MRM domain use the message that is created in the following sample: Video Rental.

Related concepts : Message flows overview. ESQL overview. Message modeling. Related tasks : Designing a message flow. Defining message flow content. Managing ESQL files. Related reference : Built-in nodes. ESQL reference.

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Writing ESQL

When you create a message flow, you include input nodes that receive the messages and, optionally, output nodes that send out new or updated messages. If required by the processing that must be performed on the message, you can include other nodes after the input node that complete the actions that your applications need. Some of the built-in nodes enable you to customize the processing that they provide. The Compute , Database , DatabaseInput , and Filter nodes require you to provide a minimum level of ESQL, and you can provide much more than the minimum to control precisely the behavior of each node. This set of topics discusses ESQL and the ways in which you can use it to customize these nodes.

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ESQL statements

You can use ESQL statements to manipulate message trees, update databases, or interact with nodes. The following table summarizes the ESQL statements and what they do. IF statement Processes a set of statements based on the result of evaluating condition expressions. LOOP statement Processes a sequence of statements repeatedly and unconditionally. If the expression evaluates to TRUE, executes the statements again.

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