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Client APIs and tools
You can use the HCL Informix® implementation of client APIs to develop applications for Informix database servers.
Informix® OLE DB Provider Guide
The Informix® OLE DB Provider Programmer's Guide describes the software requirements for using Informix OLE DB Provider, show how to install and configure the provider for your use, and explain how to use Informix OLE DB Provider to enable client applications, such as ActiveX Data Object (ADO) applications and web pages, to access data on the Informix server.
Troubleshooting installation, configuration, or operation problems
This section describes how to resolve problems that you might encounter when installing, configuring, or using Informix® OLE DB Provider.
Class not registered
When you attempt to connect to the HCL Informix® data source, the message Class not registered opens.

Client APIs and tools
You can use the HCL Informix® implementation of client APIs to develop applications for Informix database servers.
- Change Data Capture API Programmer's Guide
  The Informix® Change Data Capture API Programmer's Guide describes how to program applications to process changed data from HCL Informix databases using the Informix Change Data Capture API.
- Embedded SQLJ for HCL Informix®
  The Informix® Embedded SQLJ User's Guide contains information about using Informix Embedded SQLJ.
- ESQL/C Guide
  The Informix® ESQL/C Programmer's Manual explains how to use Informix ESQL/C, the Informix implementation of Embedded Structured Query Language (SQL) for C (ESQL/C), to create client applications with database-management capabilities.
- GLS User's Guide
  The Informix® GLS User's Guide describes the Global Language Support (GLS) feature available in Informix products.
- API
  The Informix® GLS API Programmer's Guide describes the global language support (GLS) application programming interface (API) available in Informix ESQL/C and HCL Informix DataBlade® modules.
- Informix® Object Interface for C++ Guide
  The Informix® Object Interface for C++ Programmer's Guide describes how to develop HCL Informix client applications by using the object-oriented C++ programming language.
- Informix® ODBC Driver Guide
  The Informix® ODBC Driver Programmer's Manual serves as a user guide and reference for Informix ODBC Driver, which is the Informix implementation of the Microsoft™ Open Database Connectivity (ODBC) interface, Version 3.0.
- .NET provider options
  The Data Server Provider for .NET DB2® provider option is the preferred Informix® provider for developing new applications.
- Informix® JDBC Driver Guide
  The Informix® JDBC Driver Programmer's Guide describes how to install, load, and use Informix JDBC Driver to connect to the Informix database from within a Java™ application or applet.
- Informix International Language Supplement (ILS) User Guide
  These topics include information about the translated user interface files for Informix® UNIX™ products, locales, and code set conversion tables
- Informix® OLE DB Provider Guide
  The Informix® OLE DB Provider Programmer's Guide describes the software requirements for using Informix OLE DB Provider, show how to install and configure the provider for your use, and explain how to use Informix OLE DB Provider to enable client applications, such as ActiveX Data Object (ADO) applications and web pages, to access data on the Informix server.
  - Overview and setup
  - Supported applications
    With the Informix® OLE DB Provider, you can create the ADO, C, and C++ applications.
  - Connect to a data source
    Informix® OLE DB Provider treats the database (rather than the database server instance) as a data source.
  - Cursors
  - Data types
  - Threading support
  - Transaction support
  - Distributed transaction support
    Informix® OLE DB Provider supports distributed transactions coordinated by MS DTC.
  - Identifiers
  - Support for Dynamic Query Extension
    The Dynamic Query Extension feature introduces support for describing input parameters of a prepared statement. This feature is an enhancement of the Dynamic SQL functionality of the server.
  - Support for SQL 99 Joins
    The SQL 99 Joins feature extends support for SQL joins from both within and outside of an escape sequence. This feature requires HCL Informix® server-side support for SQL 99 joins, and only works with HCL Informix Version 9.4 or later.
  - International GLS Locales
    This section offers information and tips about using Informix® OLE DB Provider with Global Language Support (GLS) locales other than the default locale, en_us.1252.
  - Troubleshooting installation, configuration, or operation problems
    This section describes how to resolve problems that you might encounter when installing, configuring, or using Informix® OLE DB Provider.
    - HCL Informix® OLE DB Provider not registered
      When you attempt to connect to the HCL Informix® data source, a message says that Informix OLE DB Provider is not registered.
    - Class not registered
      When you attempt to connect to the HCL Informix® data source, the message Class not registered opens.
    - Cannot establish a connection
      You cannot establish a connection.
    - Database not found
      A connection attempt fails; a message says that the database is not found.
    - The oledbversion table not found
      When the application attempts to fetch schema information, a message says that the table oledbversion was not found.
    - Nonalphabetic MBCS characters generate syntax errors
      When you issue an SQL statement against an MBCS database (for example, SJIS-S), the HCL Informix® server returns a syntax error if the statement includes table or column names containing MBCS characters not classified as alphabetic in the locale.
    - Server-side cursor fails to update records
      If you open a server-side cursor (adUseServer) on an SQL command (adCmdText), attempts to perform an update fail with an ADO provider not capable error.
    - Attempt to use provider from web server or other server fails
      An attempt to use OLE DB Provider from the web server or from a process that runs as a distinct user fails. The typical error message that is displayed is ADO cannot find the provider.
    - Cannot connect to transaction manager
      A connection attempt fails, a message says that the application cannot connect to the transaction manager.
    - Driver not found error
      When you attempt to run tracing, the server returns an error stating that the driver cannot be not found and might not be installed properly.
    - Errors for stored procedures
      When a stored procedure with a return value is run using theHCL Informix® OLE DB Provider, errors returned by the procedure are not returned to the application.
    - Known issues with OLE DB .NET bridge
      In a .NET application, when calling stored procedures that take no parameters, the OledbCommand attribute "CommandType" does not function as expected.

Class not registered

When you attempt to connect to the HCL Informix® data source, the message Class not registered opens.

Possible cause

The Informix® OLE DB Provider DLL might not be loaded.

Resolution

Check that the Informix® OLE DB Provider DLL is in the location recorded in the registry entry, which points to bin\ifxoledbc.dll in your Informix® Connect or Informix® Client Software Development Kit installation. If that is not the case, reregister Informix® OLE DB Provider. See the registry entries topics in the Microsoft™ OLE DB documentation for more information.

Also, make sure that INFORMIXDIR\bin is in the system path.