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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®.
Database access
Execute SQL statementsOne basic task of a DataBlade® API module is to send SQL statements to the database server for execution.
Execute SQL statementsTo execute an SQL statement, a DataBlade® API module must send the SQL statement to the database server, where the statement is executed.
Execute prepared SQL statementsA prepared statement is an SQL statement that is parsed and ready for execution. For these statements, you prepare the statement once and execute it as many times as needed.
Send the prepared statement
Statements with mi_open_prepared_statement()The mi_open_prepared_statement() function is for the execution of queries.
Define a cursor type

Define a cursor type

The mi_open_prepared_statement() function supports the following types of cursors for holding query rows.

Sequential cursor: Enables you to move through the rows of the cursor in the forward direction only
You can pass only once through the rows.
Scroll cursor: Enables you to move through the rows of the cursor in the forward and backward directions
You can move back in the rows without having to reopen the cursor; however, the database server stores the data for a scroll cursor in a temporary table. The data can become stale; that is, the data in the cursor is consistent with the data in the database when the cursor is filled, but if the data in the database changes, the data in the cursor does not reflect these changes.

Control-flag values for cursor type and mode shows the control-flag values that determine cursor type and cursor mode.

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