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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 ActiveX value objectsThis section describes how to use the OneDB® DataBlade® Developers Kit (DBDK) to create ActiveX value objects. This section describes the use of C++ to implement opaque type support routines.
Implement ActiveX value objectsTo implement the client and server projects of an ActiveX value object, you add project-specific logic to particular C++ source files generated by BladeSmith.
ActiveX propertiesIf you choose to generate access methods in the BladeSmith New Opaque Type wizard, BladeSmith generates code to make the members of the data structure available as ActiveX properties so the client application developer can access those values.

ActiveX properties

If you choose to generate access methods in the BladeSmith New Opaque Type wizard, BladeSmith generates code to make the members of the data structure available as ActiveX properties so the client application developer can access those values.

If a member of an opaque type is an array, the following additional properties are made available:

Table 1. Additional ActiveX properties
Property	Description
One-dimensional noncharacter array	A read-only property named NameDim is created to indicate the array dimension, and the property Name takes a one-based index as a parameter and returns the requested element.
Two-dimensional noncharacter array	Properties named NameDim1 and NameDim2 are created, and the property Name takes a one-dimensional character array. Returns a string of type BSTR.
Two-dimensional character array	Treated the same as a one-dimensional noncharacter array: NameDim indicates the dimension; the property Name takes a one-based index and returns the element.