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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.
Initializing a client connectionBefore a client LIBMI application can establish a connection, it must initialize the connection with the name of the database server and database to which it needs to connect.
Database parametersTo indicate which database it needs to connect to, the client LIBMI application uses database parameters. The DataBlade® API provides a database-information descriptor, MI_DATABASE_INFO, to access database parameters. This data type structure identifies the database for a particular session.
Establish default database parametersThe default database parameters identify the database and user for the connection. Before you establish a connection, you can determine whether you want to use the system-default database parameters or default database parameters that you specify.

Establish default database parameters

The default database parameters identify the database and user for the connection. Before you establish a connection, you can determine whether you want to use the system-default database parameters or default database parameters that you specify.

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