CREATE MODULE statement

The CREATE MODULE statement creates a module, which is a named container associated with a node.

Syntax

Notes:

¹ ModuleName must be a valid identifier

A module in the Eclipse tools is referred to from a message processing node by name. The module must be in the <node schema>.

Module names occupy the same symbol space as functions and procedures defined in the schema. That is, modules, functions, and procedures contained by a schema must all have unique names.

Note: You are warned if there is no module associated with an ESQL node. You cannot deploy a flow containing a node in which a module is missing.

The modules for the Compute node, Database node, and Filter node must all contain exactly one function called Main. This function should return a Boolean. It is the entry point used by a message flow node when processing a message.

The modules for the DatabaseInput node must contain the following entry points:

ReadEvents: This procedure gets details of events to be processed from your event store.
BuildMessage: This procedure builds the message that will be propagated to the flow.
EndEvent: This procedure updates the event table to ensure that this event is not processed again.

Correlation name	Compute module	Filter module	Database module	DatabaseEvent module
Database	x	x	x	x
Environment	x	x	x	x
Root		x	x	x
Body		x	x
Properties		x	x	x
ExceptionList		x	x	x
LocalEnvironment		x	x	x
InputRoot	x
InputBody	x
InputProperties	x
InputExceptionList	x
InputLocalEnvironment	x
OutputRoot	x
OutputExceptionList	x
OutputLocalEnvironment	x
DestinationList	Deprecated synonym for LocalEnvironment
InputDestinationList	Deprecated synonym for InputLocalEnvironment
OutputDestinationList	Deprecated synonym for OutputLocalEnvironment