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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®.
Database access
Connection handlingThis section describes how to initialize, establish, and close connections.
Session managementSession management is the handling of a connection to a database server and the associated session within a DataBlade® API module. A session is the period of time that elapses between when a client application establishes a connection and when this connection is closed.

Session management

Session management is the handling of a connection to a database server and the associated session within a DataBlade® API module. A session is the period of time that elapses between when a client application establishes a connection and when this connection is closed.

A connection is the mechanism over which a DataBlade API module communicates with the database server and, optionally, a database that this database server manages. The term connection has different meanings depending on whether it refers to a connection within a client LIBMI application or a C user-defined routine (UDR), as follows:

A client connection is established by a client application to a particular database server and database.
A UDR connection is established by a C UDR to obtain information about the current session.

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