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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
Smart large objects
The smart-large-object interfaceThe smart-large-object interface contains a set of functions and data types to provide access to smart large objects.
Smart-large-object data type structuresThe smart-large-object interface provides data type structures that store information about a smart large object.
Lo-specification structureThe LO-specification structure, MI_LO_SPEC, defines the storage characteristics for an existing or a new smart large object. The storage characteristics provide information about features of the smart large object and how to store it on disk.

Lo-specification structure

The LO-specification structure, MI_LO_SPEC, defines the storage characteristics for an existing or a new smart large object. The storage characteristics provide information about features of the smart large object and how to store it on disk.

The following table summarizes the memory operations for an LO-specification structure.


Memory duration	Memory operation	Function name
Current® memory duration	Constructor	mi_lo_spec_init()
Current memory duration	Destructor	mi_lo_spec_free()

To access an LO-specification structure in a DataBlade® API module, declare a pointer to an MI_LO_SPEC structure. For example, the following line shows the valid syntax of a variable that accesses an LO-specification structure:

MI_LO_SPEC *myspec; /* valid syntax */

Declaration of a flat LO-specification structure generates a compile error. The following line shows invalid syntax for an LO-specification structure:

MI_LO_SPEC myspec; /* INVALID syntax */

The milo.h header file defines the MI_LO_SPEC data type. Therefore, you must include the milo.h (or mi.h) file in DataBlade API modules that access this structure.

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