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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
Working with the database server
These topics explain how the Informix® ESQL/C program can interact with a database server.
Optimized message transfers
Informix® ESQL/C provides a feature called optimized message transfers, which allow you to minimize message transfers with the database server for most Informix ESQL/C 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.
  - 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.
      - The client-server architecture of ESQL/C applications
      - The client-server connection
        The Informix® ESQL/C application can establish a connection to any valid database environment. A database environment can be a database, a database server, or a database and a database server.
      - Interact with the database server
      - Optimized message transfers
        Informix® ESQL/C provides a feature called optimized message transfers, which allow you to minimize message transfers with the database server for most Informix ESQL/C statements.
        Restrictions on optimized message transfers
        Enabling optimized message transfers
        Error handling with optimized message transfers
        When the OPTMSG feature is enabled, your Informix® ESQL/C application cannot perform error handling on any chained statement. If you are not sure whether a particular statement might generate an error, include error-handling code and do not enable message chaining for that statement.
      - Database server control functions
      - The timeout program
        The timeout program demonstrates how to set up a timeout interval.
      - ESQL/C connection library functions in a Windows™ environment
    - 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.

Optimized message transfers

Informix® ESQL/C provides a feature called optimized message transfers, which allow you to minimize message transfers with the database server for most Informix® ESQL/C statements.

Informix® ESQL/C accomplishes optimized message transfers by chaining messages together and even eliminating some small message packets. When the optimized message transfer feature is enabled, Informix® ESQL/C expects that SQL statements will succeed. Consequently, Informix® ESQL/C chains, and in some cases eliminates, confirmation messages from the database server.