Welcome
Client APIs and tools
You can use the HCL Informix® implementation of client APIs to develop applications for Informix database servers.
.NET provider options
The HCL Data Server Provider for .NET IBM® DB2® provider option is the preferred Informix® provider for developing new applications.
Informix® .NET Provider Guide
The IBM® Informix® .NET Provider Reference Guide contains the information you need in order to use the Informix .NET Provider to access and manipulate data in HCL Informix databases.
Type reference
All of the classes described in these topics belong in the namespace IBM.Data.Informix.
IfxConnection class
Create an IfxConnection
Some methods of other objects create IfxConnection objects implicitly. To create an IfxConnection object explicitly, use one of its constructors.
IfxConnection constructors

HCL Informix® V15.0.0 documentation
Welcome to the documentation for HCL Informix® 15.0.0 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 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 15.0.0 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
  The HCL® Informix® Change Data Capture API Programmer's Guide describes how to program applications to process changed data from HCL Informix databases using the HCL Informix Change Data Capture API.
- Embedded SQLJ for HCL Informix®
  The HCL® Informix® Embedded SQLJ User's Guide contains information about using IBM Informix Embedded SQLJ.
- ESQL/C Guide
  The HCL® Informix® Enterprise Replication Guide explains how to use , 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 HCL® Informix® GLS User's Guide describes the Global Language Support (GLS) feature available in HCL Informix products.
- Informix GLS 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 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 HCL Informix ODBC Driver, which is the Informix implementation of the Microsoft™ Open Database Connectivity (ODBC) interface, Version 3.0.
- .NET provider options
  The HCL Data Server Provider for .NET IBM® DB2® provider option is the preferred Informix® provider for developing new applications.
  - Differences between .NET Providers
  - Informix® .NET Provider Guide
    The IBM® Informix® .NET Provider Reference Guide contains the information you need in order to use the Informix .NET Provider to access and manipulate data in HCL Informix databases.
    - Overview of HCL Informix® .NET Provider
      The topics in this overview describe the Informix® .NET Provider and provide information on the environment in which to use it. These topics also provide installation and connection information and general information to help you get started using the Informix .NET Provider.
    - Mapping data types
      These topics describe how data types are mapped between HCL Informix® databases and the .NET Framework.
    - Type reference
      All of the classes described in these topics belong in the namespace IBM.Data.Informix.
      - Supported public .NET interfaces
        The Informix® .NET Provider implements specific Microsoft™ .NET interfaces.
      - Supported Public .NET base classes
        The Informix® .NET Provider implements specific Microsoft™ .NET base classes.
      - Prototype syntax
        Because the objects of the Informix® .NET Provider can be used in many different programming languages, the prototypes of the methods are given in this publication using a pseudo code.
      - IfxBlob class
        An IfxBlob represents a BLOB, which is a large block of binary data that allows random access of its contents. You can treat a BLOB in much the same way you treat an operating system file. You can read or write to certain positions in the file without reading or writing through all of the data up to that position.
      - IfxClob class
        An IfxClob represents a CLOB, which is a large block of character data that allows random access of its contents. You can treat a CLOB in much the same way you treat an operating system file. You can read or write to certain positions in the file without reading or writing through all of the data up to that position.
      - IfxCommand class
      - IfxCommandBuilder class
      - IfxConnection class
        Create an IfxConnection
        Some methods of other objects create IfxConnection objects implicitly. To create an IfxConnection object explicitly, use one of its constructors.
        IfxConnection constructors
        IfxConnection public properties
        IfxConnection public methods
        IfxConnection public events
        IfxConnection example
      - IfxConnectionStringBuilder class
      - IfxDataAdapter class
      - IfxDataReader class
      - IfxDataSourceEnumerator class
      - IfxDateTime structure
      - IfxDecimal structure
      - IfxError class
      - IfxErrorCollection class
      - IfxException class
      - IfxMonthSpan structure
      - IfxParameter class
      - IfxParameterCollection class
      - IfxSmartLOBCreateTimeFlags enumeration
      - IfxSmartLOBFileLocation enumeration
      - IfxSmartLOBLocator class
      - IfxSmartLOBLockMode enumeration
      - IfxSmartLOBOpenMode enumeration
      - IfxSmartLOBWhence enumeration
      - IfxTimeSpan structure
      - IfxTimeUnit enumeration
      - IfxTransaction class
      - IfxType enumeration
    - Sample programs
  - 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
- HCL Informix 4GL
  This topic provides a link to the Informix 4GL documentation.
- Informix® JDBC Driver Guide
  The HCL® Informix® JDBC Driver Programmer's Guide describes how to install, load, and use HCL 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 HCL Informix OLE DB Provider Programmer's Guide describes the software requirements for using HCL 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.
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 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.

IfxConnection constructors

IfxConnection()

IfxConnection(System.String connectionString)

Initializes a new instance of the IfxConnection class using the information in the connectionString parameter, if provided.