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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.

Smart-large-object data type structures

The smart-large-object interface provides data type structures that store information about a smart large object.

The following table summarizes the data type structures of the smart-large-object interface.

Table 1. Data types of the smart-large-object interface
Smart-large-object data type structure	Data type	Description
The LO-specification structure	MI_LO_SPEC	Holds storage characteristics for a smart large object
The LO handle	MI_LO_HANDLE	Identifies the location of the smart large object; analogous to the file name of an operating-system file
The LO file descriptor	MI_LO_FD	Identifies an open smart large object; analogous to the file descriptor of an operating-system file
The LO-status structure	MI_LO_STAT	Holds status information about a smart large object

These structures are all opaque to a DataBlade® API module; that is, you do not access their fields directly but instead use accessor functions that the smart-large-object interface provides.

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