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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.

Initializing a client connection

Before 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.

About this task

This initialization occurs in the following steps.


Connection-initialization steps		DataBlade® API task
1.	Indicate the database server to which you want to connect.	Set connection parameters in the connection-information descriptor.
2.	Indicate the database to which you want to connect and the user you want to log in as.	Set database parameters in the database-information descriptor.
3.	Indicate settings for session-specific features (optional).	Set session parameters in the parameter-information descriptor.

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