Oracle C++ Call Interface Programmer's Guide

Processing of SQL Statements
In an OCCI application, you can also take advantage of PL/SQL, Oracle’s
procedural extension to SQL. The applications you develop can be more powerful
and flexible than applications written in SQL alone. OCCI also provides facilities for
accessing and manipulating objects in an Oracle database server.
Processing of SQL Statements
One of the main tasks of an OCCI application is to process SQL statements.
Different types of SQL statements require different processing steps in your
program. It is important to take this into account when coding your OCCI
application. Oracle recognizes several types of SQL statements:
■ Data definition language (DDL) statements
■ Control statements
– Transaction control statements
– Connection control statements
– System control statements
■ Data manipulation language (DML) statements
■ Queries
Data Definition Language Statements
Data definition language (DDL) statements manage schema objects in the database.
DDL statements create new tables, drop old tables, and establish other schema
objects. They also control access to schema objects.
The following is an example of creating and specifying access to a table:
CREATE TABLE employees (
name VARCHAR2(20),
ssn VARCHAR2(12),
empno NUMBER(6),
mgr NUMBER(6),
salary NUMBER(6))
GRANT UPDATE, INSERT, DELETE ON employees TO donna
REVOKE UPDATE ON employees FROM jamie
DDL statements also allow you to work with objects in the Oracle database, as in
the following series of statements which create an object table:
Introduction to OCCI 1-5