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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 extensions
You 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 Guide
The
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 user-defined routines
This section provides information about how to call a user-defined routine (UDR).
Obtain trigger execution information and HDR database server status
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®.
Informix®
extensions and
DataBlade®
modules
These topics describe how to use built-in database extensions and separately installed
DataBlade®
modules.
Creating extensions
You 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 Guide
The
Informix® DataBlade® API Programmer's Guide
describes information about the
DataBlade® API
, the C-language application programming interface (API) provided with
HCL Informix®
.
DataBlade® API
overview
Data manipulation
Database access
Connection handling
This section describes how to initialize, establish, and close connections.
Execute SQL statements
One basic task of a
DataBlade® API
module is to send SQL statements to the database server for execution.
Execute user-defined routines
This section provides information about how to call a user-defined routine (UDR).
Access MI_FPARAM routine-state information
When the routine manager calls a UDR, it passes the routine-state information as an extra argument, called the
function-parameter structure
, to the routine. This function-parameter structure,
MI_FPARAM
, holds the routine-state information for the C UDR with which it is associated.
Call UDRs within a
DataBlade® API
module
Call UDRs with the Fastpath interface
With the
DataBlade® API
Fastpath interface,
DataBlade® API
modules can directly invoke a UDR that was registered in the database. This interface bypasses the overhead associated with invoking a UDR through an SQL statement. This interface bypasses the query optimizer and executor, which are needed for an SQL statement. You can use this interface to execute any SQL routine.
Obtain trigger execution information and HDR database server status
Trigger information
You can create user-defined routines that are invoked in trigger action statements to obtain information about the triggers, triggering tables, views, statements, and the values of rows involved in the trigger actions.
HDR status information
To enable UDRs to recognize a High-Availability Data Replication (HDR) configuration, you can use the
mi_hdr_status()
function.
Exceptions and events
This section describes exceptions and events, and explains how to handle them in
DataBlade® API
modules.
XA-compliant external data sources
Create user-defined routines
Appendix
This section contains additional reference information.
DataBlade® API
Function Reference
The
Informix® DataBlade® API Function Reference
describes the
DataBlade® API
functions and the subset of
Informix® ESQL/C
functions that the
DataBlade® API
supports.
DataBlade®
Developers Kit
The
DataBlade®
Developers Kit (DBDK) guides contain information about the tools you can use to develop and package
DataBlade®
modules, which extend the functionality of
HCL Informix®
databases.
J/Foundation Developer's Guide
The
J/Foundation Developer's Guide
describes how to write user-defined routines (UDRs) in the Java™ programming language for
Informix®
.
R-Tree Index User's Guide
The
Informix® R-Tree Index User's Guide
describes the
HCL Informix®
R-tree secondary access method and how to access and use its components.
User-Defined Routines and Data Types Developer's Guide
The
Informix® User-Defined Routines and Data Types Developer's Guide
describes how to define new data types and enable user-defined routines (UDRs) to extend
HCL Informix®
.
Virtual-Table Interface Guide
The
Informix® Virtual-Table Interface Programmer's Guide
explains how to create a primary access method with the Virtual-Table Interface (VTI) so that users have a single SQL interface to
HCL Informix®
tables and to data that does not conform to the storage scheme of
HCL Informix®
.
Virtual-Index Interface Guide
The
Informix® Virtual-Index Interface Programmer's Guide
explains how to create a secondary access method with the Virtual-Index Interface (VII) to extend the built-in indexing schemes of
HCL Informix®
typically with a
DataBlade®
module.
Obtain trigger execution information and HDR database server status
Trigger information
You can create user-defined routines that are invoked in trigger action statements to obtain information about the triggers, triggering tables, views, statements, and the values of rows involved in the trigger actions.
HDR status information
To enable UDRs to recognize a High-Availability Data Replication (HDR) configuration, you can use the
mi_hdr_status()
function.
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