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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.
The MI_DATUM data typeThe DataBlade® API handles a generic data value as an MI_DATUM value, also called a datum. A datum is stored in a chunk of memory that can fit into a computer register.
Contents of an MI_DATUM structureA datum in an MI_DATUM structure can describe a value of any SQL data type. You can use an MI_DATUM structure to transport a value of an SQL data type between the database server and the DataBlade® API module.
MI_DATUM in a client LIBMI applicationThe preceding rules for passing values in MI_DATUM structures by reference and by value do not apply to client LIBMI applications. In client LIBMI applications, pass values of all data types in MI_DATUM structures by reference.

MI_DATUM in a client LIBMI application

The preceding rules for passing values in MI_DATUM structures by reference and by value do not apply to client LIBMI applications. In client LIBMI applications, pass values of all data types in MI_DATUM structures by reference.

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