1. JDBC and OCCI
10/29/2017

2. JDBC Java API to allow java program to interface with database
Platform independence
Database independence

3. JDBC applications Import the JDBC class (java.sql.*)
Load the JDBC drivers
Connect to the database
Interact with the database using JDBC
Disconnect with the database

4. Load the JDBC drivers
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

5. Connect to the database
Connection Conn = DriverManager.getConnection(url,username,password);
url is of the form:
Example:

6. The Connection Object
Statement
prepareStatement
CallableStatement

7. Using Statement Object
Statement Stmt = Conn.createStatement(); ResultSet RS = Stmt.executeQuery("SELECT * from user_tables");

8. The ResultSet Class
The resultset class provides access to a table of data generated by executing a query.
Methods:
Next
Close
getString(int columnIndex)

9. ResultSet Metadata ResultSetMetData rsetmd = rs.getMetaData() Method:
getColumnCount
getColumnDisplaySize(int column)
getColumnTypeName(int column)

10. Close
RS.close();
Stmt.close();
Conn.close();

11. OCCI
Oracle C++ call interface
Steps are similar to JDBC

12. Establish a connection
Create an environment
An OCCI driver manager maps to an OCI environment handle.
env = Environment::createEnvironment (Environment::DEFAULT);
Establish a connection
conn = env->createConnection (user, passwd, db);

13. create and bind a SQL statement Statement
*stmt = conn->createStatement ("SELECT * FROM user_tables");
execute the statement
stmt->execute ();

14. get the result of the statement
ResultSet *rs = stmt->getResultSet ();

15. The ResultSet Class
The resultset class provides access to a table of data generated by executing a query.
Methods:
Next
Close
getString(int columnIndex)

16. Terminate the connection
env->terminateConnection (conn); Environment::terminateEnvironment (env);