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Extending HCL OneDB™Beyond standard relational database objects, HCL OneDB™ can be extended to handle specialized data types, access methods, routines, and other objects. HCL OneDB™ includes many built-in extensions that are fully integrated in the database server. HCL OneDB™ also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for HCL OneDB™.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in HCL OneDB™ databases.
DataBlade® Developers KitThe DataBlade® Developers Kit (DBDK) guides contain information about the tools you can use to develop and package DataBlade® modules, which extend the functionality of HCL OneDB™ databases.
DataBlade® Developers Kit User's GuideThe HCL OneDB™ DataBlade® Developers Kit Users Guide describes how to use OneDB® DataBlade® Developers Kit (DBDK) tools to develop and package DataBlade® modules.
Create DataBlade® objects by using BladeSmithUse BladeSmith to create DataBlade® modules.
Create DataBlade® module objectsBladeSmith uses wizards to create and edit objects.
Create data typesYou can create extended data types in BladeSmith. In addition, you must define qualified built-in data types before you can use them in a BladeSmith project.
Opaque data typeAn opaque data type is a C structure or C++/ActiveX class. The database server does not interpret the contents of the structure. Instead, it calls support routines that you provide to manipulate the structure.
Support routinesYou can select from different categories of support routines to support your opaque data type.
Contains large objects (not available for C++)The LOhandles() function retrieves a list of the pointer structures for the smart large objects embedded in the opaque data type. The database server calls the LOhandles() function to obtain a list of large objects used by an opaque data type. The LOhandles() function takes a pointer to an instance of the data type and returns an array of the large object handles used by the object.

Contains large objects (not available for C++)

The LOhandles() function retrieves a list of the pointer structures for the smart large objects embedded in the opaque data type. The database server calls the LOhandles() function to obtain a list of large objects used by an opaque data type. The LOhandles() function takes a pointer to an instance of the data type and returns an array of the large object handles used by the object.

This category is valid for the C language. This category also includes the Assign() function and the Destroy() procedure described in Type insert and delete notification (not available for C++).

For the C language, BladeSmith prefixes the names of these functions with the name of the data type for which they are specified: OpaqueLOhandles(), OpaqueAssign(), and OpaqueDestroy().