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Field Group --> Configuration

Tasks Additional Documentation Attributes

Overview

Represents a subset of the cmp and cmr-fields of a bean. Related fields in a bean can be put into groups which are faulted into memory together as a unit. A group can be associated with a query or relationship, so that when a bean is loaded as the result of executing a query or following a relationship, only the fields mentioned in the group are loaded.

A special group named default is used for queries and relationships that have no group specified. By default, the default group contains all of a bean's cmp-fields and any cmr-fields that add a foreign key to the persistent state of the bean.

A field may belong to multiple groups. In this case, the get XXX() method for the field will fault in the first group (lexically speaking) that contains the field.

Tasks

Using the EJB Deployment Descriptor Editor

Additional Documentation

(Requires an Internet connection.)

Attributes

Attribute Label | Description | Value Constraints
--- | --- | ---
Group Name | Specifies the name of a field group. A field-group represents a subset of the cmp and cmr-fields of a bean. Related fields in a bean can be put into groups which are faulted into memory together as a unit. Attribute: GroupName | Configurable: yes Readable: yes Writable: yes
CMPFields | The names of fields in the bean instance that you want to populate from a database column. The fields that you specify must have cmp-field entries in the ejb-jar descriptor. This value is case sensitive. Attribute: CMPFields | Configurable: yes Readable: yes Writable: yes
CMRFields | The names of cmr-fields. The names must match cmr-field entries in the ejb-jar descriptor. Attribute: CMRFields | Configurable: yes Readable: yes Writable: yes