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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.
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.
Database server communication
Informix® libraries
These topics describe how to link the static, shared, and thread-safe HCL Informix® general libraries with your Informix ESQL/C application.
Choose a version of the Informix® general libraries
The Informix® general libraries

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.
  - What is Informix® ESQL/C?
  - Database server communication
    - Exception handling
    - Working with the database server
      These topics explain how the Informix® ESQL/C program can interact with a database server.
    - Informix® libraries
      These topics describe how to link the static, shared, and thread-safe HCL Informix® general libraries with your Informix ESQL/C application.
  - Dynamic SQL
  - Appendixes
    This section contains additional reference information.
- 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.

The Informix® general libraries

The following is a list of the HCL Informix® general libraries for Informix® ESQL/C on a UNIX™ operating system.

libgen: Contains functions for general tasks.
libos: Contains functions for tasks that are required from the operating system.
libsql: Contains functions that send SQL statements between client application and database server.
libgls: Contains functions that provide Global Language Support (GLS) to HCL Informix® products.
libasf: Contains functions that handle communication protocols between client application and database server.

Informix® general libraries are in the $INFORMIXDIR/lib/esql and $INFORMIXDIR/lib directories on UNIX™ operating systems.

The Informix® general library for Informix® ESQL/C for Windows™ is just one DLL named isqlt09a.dll. The file is in the %INFORMIXDIR%\lib directory.

The static library for Informix® ESQL/C for Windows™ is named isqlt09s.lib. The file is in the $INFORMIXDIR/lib directory.

On many platforms there is a system library named libgen.a. To avoid compilation errors, it is recommended that you do not use the libgen.a Informix® library. Instead, use libifgen.a Informix® library which contains a symbolic link to libgen.a.

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