Oracle C++ Call Interface Programmer's Guide

Executing SQL Queries
Executing SQL Queries
You do not need to set the maximum parameter size for fixed length datatypes,
such as Number and Date, or for parameters that use the setDataBuffer
method.
You can retrieve the current maximum parameter size setting by calling the
getMaxParamSize method.
Executing an Iterative Operation
Once you have set the maximum number of iterations and (if necessary) the
maximum parameter size, iterative execution using a parameterized statement is
straightforward, as shown in the following example:
stmt->setSQL(“INSERT INTO basket_tab VALUES(:1, :2)”);
stmt->setString(1, “Apples”); // value for first parameter of first row
stmt->setInt(2, 6); // value for second parameter of first row
stmt->addIteration(); // add the iteration
stmt->setString(1, “Oranges”); // value for first parameter of second row
stmt->setInt(1, 4); // value for second parameter of second row
stmt->executeUpdate(); // execute statement
As shown in the example, you call the addIteration method after each iteration
except the last, after which you invoke executeUpdate method. Of course, if you
did not have a second row to insert, then you would not need to call the
addIteration method or make the subsequent calls to the setxxx methods.
Iterative Execution Usage Notes
■ Iterative execution is designed only for use in INSERT, UPDATE and DELETE
operations that use either standard or parameterized statements. It cannot be
used for callable statements and queries.
■ The datatype cannot be changed between iterations. For example, if you use
setInt for parameter 1, then you cannot use setString for the same
parameter in a later iteration.
SQL query statements allow your applications to request information from a
database based on any constraints specified. A result set is returned as a result of a
query.
Relational Programming 2-13