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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™.
HCL OneDB™ extensions and DataBlade® modulesThese topics describe how to use built-in database extensions and separately installed DataBlade® modules.
TimeSeries Data User's GuideThe HCL OneDB™ TimeSeries Data User's Guide contains information to assist you in using the TimeSeries extension with HCL OneDB™.
Time series API routinesThe time series application programming interface routines allow application programmers to directly access a time series datum.
Data structures for the time series APIThe time series API uses four data structures.
The ts_tselem structure

The ts_tselem structure

A ts_tselem structure is a pointer to one element (row) of a time series.

When you use ts_tselem with a regular time series, the time stamp column in the element is left as NULL, allowing you to avoid the expense of computing the time stamp if it is not required. The time stamp is computed on demand in the ts_get_col_by_name(), ts_get_col_by_number(), and ts_get_all_cols() routines. For irregular time series, the time stamp column is never NULL.

You can convert a ts_tselem structure to and from an MI_ROW structure with the ts_row_to_elem() and ts_elem_to_row() routines.

If the element was created by the ts_make_elem() or ts_make_elem_with_buf() procedure, you must use the ts_free_elem() procedure to free the memory allocated for a ts_tselem structure.