OpenEdge provides a Java class,
com.progress.open4gl.ProDataGraphMetaData, that allows you to specify and access the schema (meta data) for a
ProDataGraph object. Before you can instantiate a
ProDataGraph object, you must first define its meta data. You can derive the meta data from an existing Java SDO
DataGraph or specify the meta data directly using a
ProDataGraphMetaData object. For more information on instantiating ProDataGraph objects, see
ProDataGraphclass.
The
ProDataGraphMetaData must contain one or more
ProDataObjectMetaData objects to specify the meta data for one or more temp-tables (
ProDataObject collections) defined for the
ProDataGraph (see
ProDataObjectMetaData class).
If the
ProDataGraph contains more than one
ProDataObjectMetaData object, the
ProDataGraphMetaData can also contain zero or more
ProDataRelationMetaData objects. A
ProDataRelationMetaData object defines a relationship between a parent and child
ProDataObject collection (see
ProDataRelationMetaData class).
