Welcome
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
Architecture of the object interface for C++
The HCL Informix® Object Interface for C++ encapsulates HCL Informix database server features into a class hierarchy.
Class hierarchy

HCL Informix® V15.0 documentation
Welcome to the documentation for HCL Informix® 15.0 and related client tools and products.
Product overview
HCL Informix® is a fast and scalable database server that manages traditional relational, object-relational, and dimensional databases. Its small footprint and self-managing capabilities are suited to embedded data-management solutions.
Installing
These topics describe how to install HCL Informix® database servers, client products, and DataBlade® modules.
Administering
In addition to administering the database server, you can tune performance, replicate data, and archive data.
Migrating and upgrading
You can upgrade to the 15.0 release of HCL Informix® or migrate from other database servers to Informix. Upgrading is an in-place migration method that uses your existing hardware and operating system software. Some changes to the Informix database server can affect upgrading from a previous release.
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
- Embedded SQLJ for HCL Informix®
- ESQL/C Guide
- GLS User's Guide
  These topics describe the Global Language Support (GLS) feature available in HCL® Informix® products.
- Informix GLS API
- Informix® Object Interface for C++ Guide
  - Architecture of the object interface for C++
    The HCL Informix® Object Interface for C++ encapsulates HCL Informix database server features into a class hierarchy.
    - Operation classes
      HCL Informix® Object Interface for C++ applications create instances of public operation classes, which contain pointers to private implementation classes.
    - Value interfaces and value objects
      The HCL Informix® Object Interface for C++ 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 HCL Informix® Object Interface for C++ programming restrictions and practices.
    - Globalization
      The HCL Informix® Object Interface for C++ provides functionality based on HCL® 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 HCL Informix® Object Interface for C++. 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 HCL Informix Object Interface for C++, 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 HCL Informix® Object Interface for C++ 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 HCL Informix® Object Interface for C++ value interfaces. The ITFactoryList and ITPreserveData classes provide support for value interfaces.
  - Appendixes
    This section contains additional reference information.
- Informix® ODBC Driver Guide
- Informix .NET Core Provider
  Starting with CSDK 4.50.xC4, Informix .NET Core Provider built with .NET Core SDK/Runtime v3.1 is shipped for Windows x64 and Linux x86_64 platforms.
- Informix® .NET EF Core Provider Guide
- Informix 4GL/SQL
  These topics include information about HCL Informix®4GL and SQL.
- Informix® JDBC Driver Guide
- 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
Embedding Informix®
When you embed HCL Informix®, you can use enterprise-class high-availability and high performance with embeddability features such as easy programmability, a small disk and memory footprint, and silent deployment.
Extending Informix®
Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix includes many built-in extensions that are fully integrated in the database server. Informix also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix.
Data warehousing
In addition to designing and implementing Informix® dimensional databases, you can use tools to create data warehouse applications and optimize your data warehouse queries.
Designing databases
The first step in creating a relational database is to construct a data model, which is a precise, complete definition of the data you want to store. After you prepare your data model, you must implement it as a database and tables. To implement your data model, you first select a data type for each column and then you create a database and tables and populate the tables with data. You can also implement fragmentation strategies and control access to your data.
JSON compatibility
You can use the popular JSON-oriented query language created by MongoDB to interact with data stored in HCL Informix®.
Security
You can secure your Informix® database server and the data that is stored in your Informix databases. You can encrypt data, secure connections, control user privileges and access, and audit data security.
SQL programming
You can use the HCL Informix® implementation of the SQL language to develop applications for Informix database servers.
Troubleshooting HCL Informix®
Several troubleshooting techniques, tools, and resources are available for resolving problems that you encounter in your HCL Informix® database server environment.

Class hierarchy

The following diagram shows the HCL Informix® Object Interface for C++ inheritance hierarchy.

begin figure description - This illustration shows the hierarchical levels of Object Interface for C++ inheritance. The classes are divided into two columns, ITObjects and ITEssential. The classes are joined by bold lines. The hierarchical order of ITObject classes is: ITTypeInfo, ITErrorManager (The following classes are hierarchical subsets of ITErrorManager: ITQuery, ITConnection, ITStatement, ITCursor, ITLargeObjectManager, ITDBNameList, ITSystemNameList, ITDBInfo, ITLocale, ITRoutineManager), ITConnectionStamp, and ITContainerIter. The classes associated with ITEssential are: ITValue, with the subset classes ITRow, ITDateTime, ITSet, and ITDatum. ITConversions, ITLargeObject, ITContainer, ITErrorInfo, and ITContainCut. Four classes are not associated with either ITObject or ITEssential but are listed below the ITObject hierarchy. The four classes are ITFactoryList, ITInt8, ITPreserveData, and ITString. - end figure description — Figure 1. C++ inheritance hierarchy