This document discusses Java Database Connectivity (JDBC) and the steps to connect to a database using JDBC. It provides an overview of JDBC architecture and its main components. It then outlines the key steps to connect to a database which include: 1) driver registration where the appropriate JDBC driver class is loaded, 2) defining the connection URL, 3) establishing a connection, 4) creating SQL statements, 5) executing queries and processing result sets, and 6) closing the connection. Examples are provided for connecting to MySQL and Derby databases using JDBC.

1. Java Database Connectivity
JDBC Connectivity Steps…
By
Prof. Sandeep Vishwakarma

2. What is JDBC
Java Database Connectivity (JDBC) is an
application programming interface (API) for the
programming language Java, which defines how a
client may access a database. It is a Java-based
data access technology used for Java database
connectivity. It is part of the Java Standard Edition
platform, from Oracle Corporation.

3. Architecture of JDBC

5. Steps to Connect..
• First do the Driver Registration
•Define the Connection URL
•Established The Connection
•Create Statement Object
•Execute a Query
•Process the Results
•Close the Connection

6. Steps to Connect..
• Example to register the OracleDriver class
Class.forName("oracle.jdbc.driver.OracleDriver");
• Example to register the MySqlDriver class
Class.forName("com.mysql.jdbc.Driver");
• Example to register the DerbyClient
Class.forName("org.apache.derby.jdbc.ClientDriver ");
 Define the Driver Registration URL:
Class.forName();

7. Steps to Connect..
 Established the Connection:-
Connection con=DriverManager.getConnection(
“URL",“username",“password");
• Example to Established the Connection using MySql:-
Connection con=DriverManager.getConnection(
"jdbc:mysql://localhost:3306/sandeep","root","root");

8. Steps to Connect..
 Create a Statement Object:
Statement stmt=con.createStatement();

9. Steps to Connect..
 Execute the Query:
 For the SELECT Query:
• String sql="Select * from emp";
• stmt.executeQuery(sql);
 For Insert/Update Query:
• String sql="Insert into emp values(101,'sandeep');
• stmt.executeUpdate(sql);

10. Steps to Connect..
 Process the Result:-
ResultSet rs=stmt.executeQuery(sql);
while(rs.next())
{
System.out.println(rs.getInt(1)+" "+rs.getString(2));
}

11. Steps to Connect..
 Close the Connection:
release all the resources that the Connection
is holding.
stmt.close();
con.close();

12.  Step-1 Driver Registration
Class.forName("com.mysql.jdbc.Driver");
 Step-2 Database Connection
Connectioncon=DriverManager.getConnection
("jdbc:mysql://localhost:3306/cbs","root","root");
//here cbs is the database name, root is the username and root is the password
 Step-3 Creating statement
Statement stmt=con.createStatement();
 Step-4 Creating result statement
ResultSet rs=stmt.executeQuery("select * from emp");
 Step-5 Process the result
while(rs.next())
System.out.println(rs.getInt(1)+"t"+rs.getString(2));
 Step-6 Close the Connection
con.close();
Summarizing the
Connection steps

13. Thank You

14. Practical-2(A)
Using Request DispatcherInterface create a Servlet which
will validate the password entered by the user, if the user
has entered "Servlet" as password, then he will be
forwarded to Welcome Servlet else the user will stay on
the index.html page and an error message will be
displayed.
By
Prof. Sandeep Vishwakarma

15. Demonstration of RequestDispatcher
• index.html will have form fields to get user
information.
• Validate.java will validate the data entered
by the user.
• Welcome.java will be the welcome page.
• web.xml , the deployment descriptor.