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User Guide
The information contained in this section applies to IBM WebSphere Commerce Version 7.0.0.9 and Feautre Pack 8. The documentation also applies to all subsequent releases and modifications until otherwise indicated in new editions.
Developing
The topics in the Developing section describe tasks performed by an application developer.
Controller layer
The Controller layer is the conductor of operations for a request. It controls the transaction scope and manages the session related information for the request. The controller first dispatches to a command and then calls the appropriate view processing logic to render the response.
Integrating with back-end systems and external applications
External systems integration is a key feature of the WebSphere Commerce solution. In WebSphere Commerce business logic is enabled for integration and built-in adapters and interfaces are provided for common integration points. Additionally, the WebSphere Commerce integration solution leverages integration standards by using various IBM connectivity solutions.
Back-end integration legacy messages
The WebSphere Commerce offers support for messages which use the legacy message format. Unless you are migrating from a previous version of WebSphere Commerce Suite, it is recommended that you use the XML messages instead, since they accomplish the same function, and are easier to read and maintain.
Product Quantity Update message
The Product Quantity Update message is an inbound message that contains inventory information for a product. A back-end application generates this message and sends it to the WebSphere Commerce inbound message queue, where the WebSphere Commerce system receives the message.
PRODUCT_QUANTITY_UPDATE_PROLOG_DATA
The Product Quantity Update message includes the PRODUCT_QUANTITY_UPDATE_PROLOG_DATA segment. This data segment identifies the type of message that is being defined; that is, the segment indicates that the message is a Product Quantity Update message with a field value of PQ (Product Quantity).

PRODUCT_QUANTITY_UPDATE_PROLOG_DATA

The Product Quantity Update message includes the PRODUCT_QUANTITY_UPDATE_PROLOG_DATA segment. This data segment identifies the type of message that is being defined; that is, the segment indicates that the message is a Product Quantity Update message with a field value of PQ (Product Quantity).

The format and the source of the fields for PRODUCT_QUANTITY_UPDATE_PROLOG_DATA are described in the following table:


Field Name	Field Type	Field Value
NC_MsgType	CHAR (10)	PQ
NC_MsgVersion	CHAR (2)	01
NC_RESERVED	CHAR (10)	Reserved for IBM use.