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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.
Raise an exceptionIf a DataBlade® API module detects an error, it can use the mi_db_error_raise() function to raise an exception.
Specify the message
Raise custom messagesThe mi_db_error_raise() function can raise exceptions with custom messages, which DataBlade® modules and UDRs can store in the syserrors system catalog table. The syserrors table maps these messages to five-character SQLSTATE values.
Adding custom messagesYou can store custom status codes and their associated messages in the syserrors system catalog table.

Adding custom messages

You can store custom status codes and their associated messages in the syserrors system catalog table.

About this task

To add a custom message:

Procedure

Determine the SQLSTATE code for the message you want to add.
Insert a row into the syserrors system catalog table for the new message.

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