The document outlines the steps for Java Database Connectivity (JDBC) including registering the driver, creating a connection object, statement object, executing queries, and closing the connection. Examples for connecting to Oracle and MySQL databases are provided, illustrating the use of specific method calls. Additionally, it mentions the application of OWL 2 ontology for describing database management systems to assist in software engineering and database administration.

1. Java Database Connectivity
with 5 Steps
By,
R. Punithavel, AP/MCA

3. 1) Register the driver class
• The forName() method of Class class is used to
register the driver class. This method is used to
dynamically load the driver class.
Ex:
Class.forName("oracle.jdbc.driver.OracleDriver");

4. 2) Create the connection object
• The getConnection() method of DriverManager class is used to
establish connection with the database.
Ex:
Connection con=DriverManager.getConnection( "jdbc:oracle:thin:
@localhost:1521:xe","system","password");

5. 3) Create the Statement object
• The createStatement() method of Connection interface is used to
create statement. The object of statement is responsible to execute
queries with the database.
EX:
Statement stmt=con.createStatement();

6. 4) Execute the query
• The executeQuery() method of Statement interface is used to execute
queries to the database. This method returns the object of ResultSet
that can be used to get all the records of a table.
EX:
ResultSet rs=stmt.executeQuery("select * from emp");
while(rs.next())
{
System.out.println(rs.getInt(1)+" "+rs.getString(2));
}

7. 5) Close the connection object
• By closing connection object statement and ResultSet
will be closed automatically. The close() method of
Connection interface is used to close the connection.
con.close();

8. • OWL 2 ontology can be used
to describe Database
Management Systems (DBMS)
in a machine-processable way.
• This description can help with
software engineering
processes and database
administration tasks, and can
help decide which DBMS is
best for a given set of
requirements.

9. EXAMPLE
import java.sql.*;
class OracleCon
{
public static void main(String args[])
{
Try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system","oracle");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from emp");
while(rs.next())
System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getString(3));
con.close();
}
catch(Exception e)
{ System.out.println(e);
}
}
}

10. My SQL Connection Example

11. import java.sql.*;
class MysqlCon{
public static void main(String args[]){
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/
sonoo","root","root");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from emp");
while(rs.next())
System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getString(3));
con.close();
}catch(Exception e){ System.out.println(e);}
}
}