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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.
Session parameters
Overriding the system-default session parametersThe database server obtains values for the session parameters from the parameter-information descriptor. The database server initializes the parameter-information descriptor with the system-default session parameters in the following table. To override these system-default values, you can initialize your own parameter-information descriptor to set session parameters.

Overriding the system-default session parameters

The database server obtains values for the session parameters from the parameter-information descriptor. The database server initializes the parameter-information descriptor with the system-default session parameters in the following table. To override these system-default values, you can initialize your own parameter-information descriptor to set session parameters.

About this task

The following DataBlade® API functions access default session parameters for a client LIBMI application.

mi_set_parameter_info(): Sets session parameters for the current session
mi_get_parameter_info(): Obtains session parameters for the current session

To override the system-default session parameters:

Procedure

Allocate a parameter-information descriptor.
Fill the fields of the parameter-information descriptor with the default session parameters you need.
If you do not set a particular field, the database server uses the system-default value in System-default session parameters for the associated session parameter.
Pass a pointer to this parameter-information descriptor to the mi_set_parameter_info() function.

Results

You can examine existing session parameters with the mi_get_parameter_info() function. This function populates a user-defined parameter-information descriptor with the current session parameters.

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