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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
Determine control mode for query dataThe mi_exec_prepared_statement() and mi_open_prepared_statement() functions specify the control mode for the data of a prepared query in their bit-mask control argument.

Determine control mode for query data

The mi_exec_prepared_statement() and mi_open_prepared_statement() functions specify the control mode for the data of a prepared query in their bit-mask control argument.

To determine the control mode, set the control argument as the following table shows.


Control mode	Control argument
Text representation	Zero (default)
Binary representation	MI_BINARY

For mi_exec_prepared_statement(), MI_BINARY is the only valid control-flag constant for the control argument. Therefore, a default value of zero as the control argument indicates text representation of the data. The following mi_exec_prepared_statement() call specifies a control mode of binary representation:

mi_open_prepared_statement(stmt_desc, MI_BINARY, ...);

For mi_open_prepared_statement(), the control argument indicates the cursor characteristics in addition to the control mode. To specify a text representation, omit the MI_BINARY control-flag constant from the control argument. Including MI_BINARY in the control argument indicates that results are to be returned in binary representation. The following mi_open_prepared_statement() call specifies an update scroll cursor and a control mode of binary representation:

mi_open_prepared_statement(
   stmt_desc, 
   MI_BINARY + MI_SEND_SCROLL, 
   ...);

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