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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® 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 Informix®.
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 Informix® databases.
R-Tree Index User's GuideThe Informix® R-Tree Index User's Guide describes the HCL Informix® R-tree secondary access method and how to access and use its components.
Manage databases that use the R-tree secondary access method
Return the coordinates of the root bounding box
Syntax

Syntax

The syntax of the rtreeRootBB() function is:

execute function rtreeRootBB ( index_name, spatial_datatype );

index_name: The name of the R-tree index for which you want to find the coordinates of the root bounding box
spatial_datatype: The spatial data type of the column that is indexed with the R-tree index named index_name

If the R-tree index is fragmented, then the rtreeRootBB() function returns the union of the root bounding box for each index fragment.

The format of the return value of the rtreeRootBB() function is defined by the output function of the specified data type. The output function of the spatial data type is a user-defined routine that specifies how to convert between the internal representation of the data type to its external representation. This output function must be able to display the bounding box of the corresponding data type as well as the data type itself.

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