Home
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.
User-Defined Routines and Data Types Developer's GuideThe HCL OneDB™ User-Defined Routines and Data Types Developer's Guide describes how to define new data types and enable user-defined routines (UDRs) to extend HCL OneDB™.
Write support functions
Perform bulk copies
Importbinary and exportbinary support functions
Exportbinary support function

Exportbinary support function

The exportbinary support function takes as an argument the internal structure for the opaque type and returns a structure that holds the bulk-copy format of the external binary representation of the opaque type.

If you do not provide an exportbinary support function, the database server exports the binary data in the external binary representation of the opaque data type.

For C language support, the following function signature is for an exportbinary support function of an opaque data type whose internal structure is ll_longlong_t:

mi_impexpbin * ll_longlong_exportbin(ll_longlong_t
*srvr_intrnl_bopy_format);

The ll_longlong_exportbin() function is a cast function from the ll_longlong_t internal structure to the IMPEXPBIN data type. It must be registered as an explicit cast function with the CREATE EXPLICIT CAST statement. For more information, see Create casts for opaque data types.