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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®.
Data manipulation
Complex data typesThis section describes the complex data types and the functions that the DataBlade® API supports to process collection and row-type data.
Row typesA row type is a complex data type that is made up of a sequence of one or more elements called fields. Each field has a name and a data type. A row type is similar to a C struct data type. The DataBlade® API provides support for row types in both their text and binary representations.
Create a row typeTo create a row type, you create a row structure (MI_ROW) that holds the row type.
Create the row descriptorYou create a row descriptor for a row type with the mi_row_desc_create() function.

Create the row descriptor

You create a row descriptor for a row type with the mi_row_desc_create() function.

The mi_row_desc_create() is the constructor function for a row descriptor. You provide this function with the type identifier of the row type for which you want the row descriptor. If you do not know the type identifier for your row type, use the mi_type_typename() function or mi_typestring_to_id() to create a type identifier based on the type name. The type name for a row type is its text representation.

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