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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
Execute SQL statementsOne basic task of a DataBlade® API module is to send SQL statements to the database server for execution.
Retrieving query data
Obtain column values
Access the columnsThe mi_value() and mi_value_by_name() functions access the row structure for the current row. The current row is in the cursor that is associated with the current statement. Because a current statement is associated with a connection, you must pass a connection descriptor into mi_value() or mi_value_by_name() to identify the row to access.

Access the columns

The mi_value() and mi_value_by_name() functions access the row structure for the current row. The current row is in the cursor that is associated with the current statement. Because a current statement is associated with a connection, you must pass a connection descriptor into mi_value() or mi_value_by_name() to identify the row to access.

These functions pass back the column value as an MI_DATUM value. The format of this value depends on whether the control mode for the query data is text or binary representation. Each of the DataBlade® API statement-execution functions indicates the control mode for query data.

To obtain this column value, your DataBlade API module must perform the following steps:

Declare a value buffer to hold the column value that mi_value() or mi_value_by_name() passes back.
Obtain the column value from the value buffer, based on the value status that mi_value() or mi_value_by_name() returns.

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