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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.
Collection data typeA collection data type is a set of elements of another, single data type. Collection elements can never be null.

Collection data type

A collection data type is a set of elements of another, single data type. Collection elements can never be null.

You can overload existing user-defined routines and built-in routines to work on your collection data type. You can also define custom support routines for your collection data type. See Create routines for instructions.

The following table lists the properties you specify when you create a collection data type.


Property	Default value	Description
Type	None	The data type that makes up the collection. For more information, see Valid element data types.
Constructor	None	The type constructor: LIST, MULTISET, or SET. For more information, see Type constructors.

See the HCL OneDB™ Guide to SQL: Tutorial for general information about collection data types.