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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® API Programmer's GuideThe Informix® DataBlade® API Programmer's Guide describes information about the DataBlade® API, the C-language application programming interface (API) provided with HCL Informix®.
Create user-defined routines
Create special-purpose UDRsThis section describes how to create special UDRs, such as iterator functions, user-defined aggregates, and optimization functions.
Write an aggregate functionAn aggregate is a function that returns one value for a group of queried rows. The aggregate function performs one iteration for each of the queried rows.
Creating a user-defined aggregate
The user-defined aggregateAfter you complete the aggregate-development steps, the user can use the user-defined aggregate on the defined data type in SQL statements. However, use of the user-defined aggregate does assume the appropriate privileges.

The user-defined aggregate

After you complete the aggregate-development steps, the user can use the user-defined aggregate on the defined data type in SQL statements. However, use of the user-defined aggregate does assume the appropriate privileges.

For the tab1 table, which A table with a complexnum_t column defines, the following query uses the new SQSUM1 aggregate function on the INTEGER column, col3:

SELECT SQSUM1(col3) FROM tab1;

With the rows that A table with a complexnum_t column has inserted, the preceding query yields an INTEGER value of 10201.

To be able to use SQSUM1 on other data types, you need to ensure that the appropriate aggregate support functions exist for this data type. For example, The SQSUM2 user-defined aggregate shows the definition of a version of the SQSUM aggregate on both an INTEGER and a named row type.

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