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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.
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.
Handle locale-specific data
Each HCL Informix® SQL API product contains a processor to process Informix ESQL/C source files that have embedded SQL and preprocessor statements.

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.
  - 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.
    - Support for GLS in Informix® client applications
      To connect to a database, the Informix® ESQL/C client application requests a connection from the database server. The database server must verify that it can access the database and establish the connection between the client and the database.
    - Globalize client applications
      To globalize or localize a client application, use , an application programming interface (API) for applications that use a C-language interface.
    - Handle locale-specific data
      Each HCL Informix® SQL API product contains a processor to process Informix ESQL/C source files that have embedded SQL and preprocessor statements.
      - Process characters
        A GLS locale supports a specific code set, which can contain single-byte characters and multibyte characters.
      - Format data
        When you globalize an application, consider how to handle the format of locale-specific data.
      - Avoid partial characters
        When you use a locale that supports a multibyte code set, make sure that you define buffers large enough to avoid the generation of partial characters.
  - 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.

Handle locale-specific data

Each HCL Informix® SQL API product contains a processor to process Informix® ESQL/C source files that have embedded SQL and preprocessor statements.

The Informix® ESQL/C processor, esql, processes C source files.

The processors for Informix® ESQL/C products use operating-system files in the following situations:

They write language-specific source files (.c) when they process the Informix® ESQL/C source file.
The Informix® ESQL/C processors use the client code set (that the client locale specifies) to generate the file names for these language-specific files.
They read Informix® ESQL/C source files (.ec) that the user creates.
The Informix® ESQL/C processors use the client code set to interpret the contents of these Informix® ESQL/C source files.

Use the CLIENT_LOCALE environment variable to specify the client locale.