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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
Exceptions and eventsThis section describes exceptions and events, and explains how to handle them in DataBlade® API modules.
Database server exceptionsWhen the database server or a UDR raises a database server exception, the DataBlade® API invokes any callbacks that are registered for the exception.
Understanding database server exceptionsA database server exception is an unexpected condition that occurs within the database server.
Status variablesTo identify the particular cause of an exception, the database server sets the SQLSTATE and SQLCODE status variables. The SQLSTATE status variable holds a five-character code that is compliant with ANSI and X/Open standards. The SQLCODE status variable holds an integer value that is specific to HCL Informix®.
SQLCODE status valueEach SQLSTATE value also has an associated status code that is specific to HCL Informix®. The database server saves this status code in the SQLCODE status variable. The SQLCODE variable is an integer that indicates whether the SQL statement succeeded or failed.

SQLCODE status value

Each SQLSTATE value also has an associated status code that is specific to HCL Informix®. The database server saves this status code in the SQLCODE status variable. The SQLCODE variable is an integer that indicates whether the SQL statement succeeded or failed.

When the database server executes an SQL statement, the database server automatically updates the SQLCODE variable. After an SQL statement executes, the SQLCODE variable can indicate one of the status conditions that the following table shows.

Table 1. Status conditions in SQLCODE
Status condition	SQLCODE value
Success	0
Success, but no rows found	100
Success, but warnings generated	not available directly from SQLCODE
Failure, runtime error generated	< 0

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