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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
Modify a smart large objectAfter you have an LO file descriptor for an open smart large object, you can modify the smart large object by updating the smart large object or by altering some storage characteristics of the smart large object.
Updating a smart large objectA smart large object has two parts: its LO handle and its data in the sbspace. You can update either of these parts. The UPDATE statement can store a new LO handle in a CLOB, BLOB, or opaque-type column.
Updating an LO handle

Updating an LO handle

About this task

To update an LO handle:

Procedure

Update the column with a new smart large object.
Overwrite the existing LO handle in the column with the LO handle for the new smart large object.
Store an additional reference to an existing smart large object.
Multiple columns can reference the same smart large object on disk. You can overwrite an existing LO handle in the column with the LO handle for an existing smart large object. Both columns now reference the same smart large object.

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