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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
Creating a smart large object
Choosing storage characteristicsAfter initializing an LO-specification structure, you need to ensure that this structure contains the appropriate values for the storage characteristics you want the smart large object to have.
Storage-characteristics hierarchyHCL Informix® uses the storage-characteristics hierarchy to obtain the storage characteristics for a new smart large object.
Define user-specified storage characteristicsYou can define user-specified storage characteristics when you create a smart large object.

Define user-specified storage characteristics

You can define user-specified storage characteristics when you create a smart large object.

DataBlade® API functions can specify the storage characteristics that Specifying disk-storage information and Specifying attribute information show. The user-specified storage characteristics apply only to the particular smart-large-object instance that is being created. They override any corresponding column-level or system-specified storage characteristics.

After you have an LO-specification structure allocated, you can use the appropriate LO-specification accessor functions to set fields of this structure. Accessor functions also exist to retrieve storage-characteristic values from the LO-specification structure. When a smart-large-object creation function receives the LO-specification structure, it creates a smart-large-object instance that has these user-specified storage characteristics.

Restriction: The LO-specification structure, MI_LO_SPEC, is an opaque structure to DataBlade API modules. Do not access its internal structure directly. The internal structure of MI_LO_SPEC might change in future releases. Therefore, to create portable code, always use the LO-specification accessor functions to obtain and store values from this structure.

The following sections describe how to access each group of storage characteristics in the LO-specification structure.

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