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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®.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
DataBlade® Developers KitThe DataBlade® Developers Kit (DBDK) guides contain information about the tools you can use to develop and package DataBlade® modules, which extend the functionality of HCL Informix® databases.
DataBlade® Module Development OverviewThe HCL Informix® DataBlade® module overview serves as an overview of the HCL Informix® DataBlade® module development process.
DataBlade® module concepts
DataBlade® module components
Data typesThe database server uses data types to determine how to store and retrieve different kinds of data.
Qualified built-in data typesA qualified data type is a built-in data type that has an added qualification that specifies information about the storage size, range of values, or precision of the type.

Qualified built-in data types

A qualified data type is a built-in data type that has an added qualification that specifies information about the storage size, range of values, or precision of the type.

You must define a qualified data type by specifying its qualifications.

For example, the DECIMAL(p,s) data type can take qualifiers for precision (the total number of digits) and scale (the total number of digits following the decimal point). So, the DECIMAL(6,3) data type has six digits, with three digits to the right of the decimal point; for example, 123.456.

For a complete list of qualified data types and their parameters, see the Informix® Guide to SQL: Reference.

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