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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®.
Create user-defined routines
Develop a user-defined routineA C user-defined routine (UDR) is a UDR that is written in the C language and uses the server-side implementation of the DataBlade® API to communicate with the database server. C UDRs (functions and procedures) are implemented as C-language functions. DataBlade® modules often include C UDRs that are made available for use by registering them in the database.
Creating UDR codeThis section provides an overview of C UDR development.
Session managementSession management is different in a C UDR than in a client LIBMI application. Unlike a client LIBMI application, which can simultaneously connect to several databases, a UDR inherits a particular session context. That is, it is within an existing session and uses a database that is already opened.

Session management

Session management is different in a C UDR than in a client LIBMI application. Unlike a client LIBMI application, which can simultaneously connect to several databases, a UDR inherits a particular session context. That is, it is within an existing session and uses a database that is already opened.

For information, see Establish a UDR connection (Server).

Because a C UDR can establish only a UDR connection, not a client connection, restrictions apply in the following areas:

Sessions
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