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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.
Prepare an SQL statementTo turn a statement string for an SQL statement into a format that the database server can execute, use the mi_prepare() statement.

Prepare an SQL statement

To turn a statement string for an SQL statement into a format that the database server can execute, use the mi_prepare() statement.

The mi_prepare() function performs the following tasks to create a prepared statement:

Sends a statement string to the database server for parsing.
Assigns an optional name to the SQL statement.
Returns a pointer to a statement descriptor for the prepared statement.

Tip: The mi_prepare() function performs the same basic task for a DataBlade® API module as the SQL PREPARE statement does for the Informix® ESQL/C application.

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