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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.
Establish a connectionThe DataBlade® API functions, mi_open() and mi_server_connect() (client only), are constructor functions for a connection descriptor.
Establish a client connectionA client LIBMI application can establish a client connection with the mi_open() or the mi_server_connect() function
Connections with mi_server_connect()To exercise more control over which connection to establish, a client LIBMI application can use mi_server_connect(), which establishes a connection to a specified database server.

Connections with mi_server_connect()

To exercise more control over which connection to establish, a client LIBMI application can use mi_server_connect(), which establishes a connection to a specified database server.

The mi_server_connect() function obtains information about which database server to connect to from a connection-information descriptor. This function does not open a database. This DataBlade® API function provides greater flexibility for client LIBMI applications that run against different database servers. You can pass information about the connection through descriptors.

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