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Constructs an instance of a Relational Data Access Service
from the passed metadata.
Список параметров
database_metadata
An array containing one or more table definitions,
each of which is an associative array containing the keys
name,
columns,
PK, and optionally,
FK.
For a full discussion of the metadata, see the
metadata
section in the general information about the Relational DAS.
application_root_type
The root of each data graph is an object of a special root type and
the application data objects come below that.
Of the various application types in the SDO model,
one has to be the the application type immediately
below the root of the data graph.
If there is only one table in the database metadata,
so the application root type can be inferred, this argument can be omitted.
SDO_containment_references_metadata
An array containing one or more definitions of a containment relation,
each of which is an associative array containing the keys
parent
and
child.
The containment relations describe how the types in the model
are connected to form a tree.
The type specified as the application root type must be present
as one of the parent types in the containment references.
If the application only needs to work with one table at a time,
and there are no containment relations in the model,
this argument can be omitted.
For a full discussion of the metadata, see the
metadata
section in the general information about the Relational DAS.
Возвращаемые значения
Returns an SDO_DAS_Relational object on success.
Исключения
SDO_DAS_Relational::__construct()
throws a SDO_DAS_Relational_Exception if
any problems are found in the metadata.
Примеры
For a full discussion of the metadata, see the
metadata
section in the general information about the Relational DAS.