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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.
GLS User's Guide
The Informix® GLS User's Guide describes the Global Language Support (GLS) feature available in Informix products.
Database server features
These topics describe how the GLS feature affects the database server.
GLS support by Informix® database servers
The database server can perform read and write operations to the operating-system files:
Database server code-set conversion
These topics summarize the code-set conversion that the database server performs.

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.
  - GLS fundamentals
    The Global Language Support (GLS) feature lets Informix® products handle different languages, cultural conventions, and code sets for Asian, African, European, Latin American, and Middle Eastern countries.
  - GLS environment variables
    HCL Informix® products establish the client, database, and server locales with information from GLS-related environment variables and from data that is stored in the database.
  - SQL features
    These topics explain how the GLS feature affects the Informix® implementation of SQL.
  - Database server features
    These topics describe how the GLS feature affects the database server.
    - GLS support by Informix® database servers
      The database server can perform read and write operations to the operating-system files:
      - Database server code-set conversion
        These topics summarize the code-set conversion that the database server performs.
      - Data that the database server converts
        When the database server transfers data to and from its operating-system files, it handles any differences in the code sets of the server-processing locale and the server locale.
    - Locale-specific support for utilities
      This section provides information that is specific to the use of the GLS feature by database server utilities.
    - Locale support for C User-defined routines (Informix® and DB API)
      HCL Informix® allows you to create user-defined routines (UDRs) that are written in the C programming language.
  - General SQL API features (ESQL/C)
    These topics explain how the GLS feature affects applications that you develop with the Informix® Client Software Development Kit.
  - Informix® ESQL/C features
    These topics explain how the GLS feature affects Informix® ESQL/C, an SQL application programming interface (API).
  - Appendix
    This section contains additional reference information.
- 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.

Database server code-set conversion

These topics summarize the code-set conversion that the database server performs.

For more general information about code-set conversion, see Perform code-set conversion.

The HCL Informix® database server automatically performs code-set conversion between the code sets of the server-processing locale and the server locale when the following conditions are true:

The CLIENT_LOCALE, DB_LOCALE, and SERVER_LOCALE environment variables are set such that the code sets of the server-processing locale and the server locale are different.
A valid code-set conversion exists between the code sets of the server-processing locale and server locale.

For a list of files for which HCL Informix® database servers perform code-set conversion, see GLS support by Informix database servers. For information about GLS code-set conversion files, see Code-set-conversion files.

Enterprise Replication supports replication between database servers that use different code sets. See Enabling code set conversion between replicates for more information.

After the database server creates the operating-system file, it has generated a file name and written file contents in the code set of the server locale (the server code set). Any HCL Informix® product or client application that needs to access this file must have a server-processing locale that supports this same server code set. You must ensure that the appropriate CLIENT_LOCALE, DB_LOCALE, and SERVER_LOCALE environment variables are set so that the server-processing locale supports a code set with these non-ASCII characters. For more information about the server-processing locale, see Determine the server-processing locale.

The database server checks the validity of a file name with respect to the server-processing locale before it references the file name.