Oracle C++ Call Interface Programmer's Guide

The OTT Utility and OCCI Applications
The datatypes of the attribute are mapped to types that are used in Oracle object
datatypes, as defined in Table 7–2 on page 7-19.
For each class, two new operators, a getSQLTypeName method, two constructors,
two readSQL methods and two writeSQL methods are generated. The
getSQLTypeName method, the constructor, the readSQL and writeSQL methods
are called by OCCI while unmarshalling and marshalling the object data.
By default, the OTT-generated C++ class for an object type is derived from the
PObject class and so the generated constructor in the class also derives from the
PObject class. For inherited database types, the class is derived from the parent
type class as is the generated constructor and only the elements corresponding to
attributes not already in the parent class are included.
Class declarations that include the elements corresponding to the database type
attributes and the method declarations are included in the header file generated by
the OTT utility. The method implementations are included in the CPPFILE file
generated by the OTT utility.
The following is an example of the C++ classes generated by the OTT utility as a
result of this series of steps:
1. Define the types:
CREATE TYPE FULL_NAME AS OBJECT (first_name CHAR(20), last_name CHAR(20));
CREATE TYPE ADDRESS AS OBJECT (state CHAR(20), zip CHAR(20));
CREATE TYPE ADDRESS_TAB AS VARRAY(3) of REF ADDRESS;
CREATE TYPE PERSON AS OBJECT (id NUMBER, name FULL_NAME, curr_addr REF ADDRESS,
prev_addr_l ADDRESS_TAB) NOT FINAL;
CREATE TYPE STUDENT UNDER PERSON (school_name CHAR(20));
2. Provide an INTYPE file:
CASE = SAME
MAPFILE = RegisterMappings_3.cpp
TYPE FULL_NAME AS FullName
TRANSLATE first_name as FirstName
last_name as LastName
TYPE ADDRESS
TYPE PERSON
TYPE STUDENT
3. Invoke the OTT utility:
ott userid=scott/tiger intype=demoin_3.typ outype=demoout_3.typ code=cpp
hfile=demo_3.h cppfile=demo_3.cpp
How to Use the Object Type Translator Utility 7-31