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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® 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.
Architecture of the object interface for C++
The encapsulates HCL Informix® database server features into a class hierarchy.
Implementation notes
This section describes the programming restrictions and practices.
Restrictions

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.
  - Architecture of the object interface for C++
    The encapsulates HCL Informix® database server features into a class hierarchy.
    - Operation classes
      applications create instances of public operation classes, which contain pointers to private implementation classes.
    - Value interfaces and value objects
      The creates C++ objects that encapsulate data retrieved from a database. These value objects are created by the Object Interface for C++ by using an extensible class factory that maps server data types to C++ objects.
    - Class hierarchy
    - Implementation notes
      This section describes the programming restrictions and practices.
      - Restrictions
      - Passing objects—compiler dependency
        When you pass an object to a function by value, the C++ compiler creates a temporary copy of the object to pass to the function. The compiler deletes the object after the function returns. The exact time at which temporary objects are deleted is compiler-dependent. For this reason, your application must not rely on the automatic destruction of temporary objects.
      - Informix® database server compatibility
        The can be used to create database client applications that run against HCL Informix® databases. However, classes and methods that support version 9,x and 10.x extensibility features are not supported with version 7.x databases.
    - Globalization
      The provides functionality based on Informix® Global Language Support.
  - Issue database queries and retrieve results
    To interact with a database, your C++ client application uses the operation classes of the . These classes have methods for opening database connections, submitting queries, and manipulating database cursors. This section describes how to use these methods.
  - Access data values
    This section describes the specific value interfaces in detail, and shows how to modify value objects and extract information through the value interfaces into host variables in your application.
  - Create and extend value objects
    When you retrieve values from the HCL Informix® database by using the , the values are returned as value objects. Value objects are created by the Object Interface for C++ by using an extensible class factory that maps Informix data types to C++ objects.
  - Operation class reference
    This section is an alphabetized reference that lists and describes the operation classes. Each class has an assignment operator and a copy constructor, which are not listed in the tables of methods.
  - Value interface reference
    This section lists and describes the value interfaces. The ITFactoryList and ITPreserveData classes provide support for value interfaces.
  - Appendixes
    This section contains additional reference information.
- 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.

Restrictions

The is subject to the following restrictions:

The Object Interface for C++ does not support object persistence for application classes; it does not automatically map instances of database tables to application classes or vice versa.
You cannot directly update the database data by modifying the corresponding value objects; to modify the database data that corresponds to the data returned to client programs in value objects, you must issue SQL queries, or the methods ITCursor::UpdateCurrent() and ITCursor::DeleteCurrent().
You cannot develop server functions by using the Object Interface for C++.
Do not mix database access through the Object Interface for C++ and lower-level interfaces (like the DataBlade® API) in the same application.
The Object Interface for C++ is not thread-safe. Do not use Object Interface for C++ in multi-threaded applications or environments.