A function is essentially a stored procedure that returns a result. This example demonstrates how to call functions with IN, OUT, and IN/OUT parameters.
CallableStatement cs;
try {
// Call a function with no parameters; the function returns a VARCHAR
// Prepare the callable statement
cs = connection.prepareCall("{? = call myfunc}");
// Register the type of the return value
cs.registerOutParameter(1, i);
// Execute and retrieve the returned value
cs.execute();
String retValue = cs.getString(1);
// Call a function with one IN parameter; the function returns a VARCHAR
cs = connection.prepareCall("{? = call myfuncin(?)}");
// Register the type of the return value
cs.registerOutParameter(1, Types.VARCHAR);
// Set the value for the IN parameter
cs.setString(2, "a string");
// Execute and retrieve the returned value
cs.execute();
retValue = cs.getString(1);
// Call a function with one OUT parameter; the function returns a VARCHAR
cs = connection.prepareCall("{? = call myfuncout(?)}");
// Register the types of the return value and OUT parameter
cs.registerOutParameter(1, Types.VARCHAR);
cs.registerOutParameter(2, Types.VARCHAR);
// Execute and retrieve the returned values
cs.execute();
retValue = cs.getString(1); // return value
String outParam = cs.getString(2); // OUT parameter
// Call a function with one IN/OUT parameter; the function returns a VARCHAR
cs = connection.prepareCall("{? = call myfuncinout(?)}");
// Register the types of the return value and OUT parameter
cs.registerOutParameter(1, Types.VARCHAR);
cs.registerOutParameter(2, Types.VARCHAR);
// Set the value for the IN/OUT parameter
cs.setString(2, "a string");
// Execute and retrieve the returned values
cs.execute();
retValue = cs.getString(1); // return value
outParam = cs.getString(2); // IN/OUT parameter
} catch (SQLException e) {
}
