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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.
DataBlade® API Programmer's GuideThe Informix® DataBlade® API Programmer's Guide describes information about the DataBlade® API, the C-language application programming interface (API) provided with HCL Informix®.
DataBlade® API overview
Access SQL data typesThis section provides an overview of the data types that the DataBlade® API supports.
Varying-length data type structuresA varying-length data type structure can hold data whose length varies from one instance to the next. The database server uses varying-length structures extensively to manage data transfer for DataBlade® API modules.
Access a varying-length structure
Information about varying-length data

Information about varying-length data

Use the following DataBlade® API accessor functions to obtain information about varying-length data from a varying-length structure.


Varying-length information	DataBlade API accessor function
Length of varying-length data	mi_get_varlen()
Data portion	mi_lvarchar_to_string(), mi_var_to_buffer(), mi_var_copy()
Data pointer	mi_get_vardata(), mi_get_vardata_align()

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