This document discusses using JSP and servlets to connect to a database and perform SQL queries. It describes creating a dynamic web project with a servlet called DataServlet that connects to a database using a DBconnect class. The servlet can then execute SQL insert, update, delete, and select statements to manipulate and retrieve data from the database. A controller class with methods like insert abstract the database interaction and SQL execution.

3. 
Username,Password,
,

5. • action
servlet

6.  Servlet
NewFile2.jsp

9. SQL)
SQL)
SQL
Select query
Update query
Insert query
Delete query

10. JSP Servlets and Database

13. Dynamic Web Project Servlet " DataServlet.ja

15. public class controller {
DBconnect db = new DBconnect();
Statement stmt;
ResultSet rs = null;
public int insert(String sql) {
try {
db.createConnection();
stmt = db.getStatement();
stmt.executeUpdate(sql);
} catch (SQLException ex) {
Logger.getLogger(controller.class.getName()).log(Level.SEVERE,null, ex);
return 0;
}
db.closeConnection();
return 1;
}

20. UserDAO Mysql

21. display