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Java Servlet Programing Laungage

Java Servlet Projects

Servlet Project 3

Java Servlet :Deleting data from table by name
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This example shows you how to delete the data from the database table by providing the unique name using the JDBC and servlet.

index.html

<html>
	<head>
	 <title>Delete Data from database by Name </title>
	</head>
	<body>
	 <form action="del" method="get">
	 UserName<input type="text" name="txtName"><br>
	 <input type="submit" value="delete"><br>
	 </form>
	 </body>
</html>

 

web.xml

<web-app>
	<servlet>
	 <servlet-name>s1</servlet-name>
	 <servlet-class>Delete</servlet-class>
	</servlet>
	<servlet-mapping>
	 <servlet-name>s1</servlet-name>
	 <url-pattern>del</url-pattern>
	</servlet-mapping>
</web-app>

Delete.java

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;
public class Delete extends HttpServlet
{
  public void doGet(HttpServletRequest request,
	HttpServletResponse response)throws 
	     ServletException,IOException
  {
   response.setContentType("text/html");
   PrintWriter out=response.getWriter();
   String name=request.getParameter("txtName");
   try
   {
    Class.forName("oracle.jdbc.driver.OracleDriver");
    Connection con=DriverManager.getConnection
		("jdbc:oracle:thin:@localhost:1521:xe","system","oracle");	
    PreparedStatement stmt=con.prepareStatement("delete from emp where name=?");
    stmt.setString(1, name);
	int i=stmt.executeUpdate();
    if(i!=0)
    out.println("<b>You are successfully deleted</b>");
    con.close();
    }
    catch(Exception e)
   {
    out.println("<b> failed</b>"); 
    out.println("<b>Error:</b>" +e);
   }
 }
}
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