SDO _DAS _Relational: : _ _construct
(^)
SDO_DAS_Relational::__construct — Creates an instance of a Relational Data Access Service
Description
$database_metadata
[,
string
$application_root_type
[,
array
$SDO_containment_references_metadata
]] )This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.
Constructs an instance of a Relational Data Access Service from the passed metadata.
Parameters
- 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 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.
Errors/Exceptions
SDO_DAS_Relational::__construct() throws a SDO_DAS_Relational_Exception if any problems are found in the metadata.
Examples
For a full discussion of the metadata, see the metadata section in the general information about the Relational DAS.
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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