Oracle C++ Call Interface Programmer's Guide

Types of SQL Statements in the OCCI Environment
Callable Statements
stmt->executeUpdate(); // execute statement
To insert another row:
stmt->setString(1, “Apples”); // value for first parameter
stmt->setInt(2, 9); // value for second parameter
Having specified the parameters, you again insert values into the row:
stmt->executeUpdate(); // execute statement
If your application is executing the same statement repeatedly, then avoid changing
the input parameter types because a rebind is performed each time the input type
changes.
PL/SQL stored procedures, as their name suggests, are procedures that are stored
on the database server for reuse by an application. By using OCCI, a call to a
procedure which contains other SQL statements is referred to as a callable
statement.
For example, suppose you wish to call a procedure (countFruit) that returns the
quantity of a specified kind of fruit. To specify the input parameters of a PL/SQL
stored procedure, call the setxxx methods of the Statement class as you would
for parameterized statements.
stmt->setSQL("BEGIN countFruit(:1, :2); END:");
int quantity;
stmt->setString(1, "Apples");
// specify the first (IN) parameter of procedure
However, before calling a stored procedure, you need to specify the type and size of
any OUT and IN/OUT parameters by calling the registerOutParam method.
stmt->registerOutParam(2, Type::OCCIINT, sizeof(quantity));
// specify the type and size of the second (OUT) parameter
You now execute the statement by calling the procedure:
stmt->executeUpdate(); // call the procedure
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