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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.
Character data types
The mi_lvarchar data type

The mi_lvarchar data type

The mi_lvarchar data type has the following uses:

Holds data of an LVARCHAR column
Holds character data that is passed to or received from an SQL statement when the query is in binary mode
Holds data for character arguments and return values of C UDRs (Server only)
Holds the external format of an opaque data type (Server only)

The following sections summarize each of these uses of an mi_lvarchar.

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