How to edit and delete a row from the existing table in servlets?
Hi Friend,
Try this:
1)application.jsp:
<%@ page import="java.sql.*" %> <html> <head> <script language="javascript"> function editRecord(id){ var f=document.form; f.method="post"; f.action='http://localhost:8080/examples/jsp/edit.jsp?id='+id; f.submit(); } function deleteRecord(id){ var f=document.form; f.method="post"; f.action='http://localhost:8080/examples/DeleteServlet?id='+id; f.submit(); } </script> </head> <body> <br><br> <form method="post" name="form"> <table border="1"> <tr><th>Name</th><th>Address</th><th>Contact No</th><th>Email</th></tr> <% Connection con = null; String url = "jdbc:mysql://localhost:3306/"; String db = "test"; String driver = "com.mysql.jdbc.Driver"; String userName ="root"; String password="root"; int sumcount=0; Statement st; try{ Class.forName(driver).newInstance(); con = DriverManager.getConnection(url+db,userName,password); String query = "select * from employee"; st = con.createStatement(); ResultSet rs = st.executeQuery(query); %> <% while(rs.next()){ %> <tr><td><%=rs.getString(2)%></td> <td><%=rs.getString(3)%></td> <td><%=rs.getString(4)%></td> <td><%=rs.getString(5)%></td> <td><input type="button" name="edit" value="Edit" style="background-color:#49743D;font-weight:bold;color:#ffffff;" onclick="editRecord(<%=rs.getString(1)%>);" ></td> <td><input type="button" name="delete" value="Delete" style="background-color:#ff0000;font-weight:bold;color:#ffffff;" onclick="deleteRecord(<%=rs.getString(1)%>);" ></td> </tr> <% } %> <% } catch (Exception e) { e.printStackTrace(); } %> </table> </form> </body> </html>
2)edit.jsp:
<%@page language="java"%> <%@page import="java.sql.*"%> <form method="post" action="../UpdateServlet"> <table border="1"> <tr><th>Name</th><th>Address</th><th>Contact No</th><th>Email</th></tr> <% String id=request.getParameter("id"); int no=Integer.parseInt(id); int sumcount=0; try { Class.forName("com.mysql.jdbc.Driver").newInstance(); Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root"); String query = "select * from employee where id='"+no+"'"; Statement st = conn.createStatement(); ResultSet rs = st.executeQuery(query); while(rs.next()){ %> <tr> <td><input type="text" name="name" value="<%=rs.getString("name")%>"></td> <td><input type="text" name="address" value="<%=rs.getString("address")%>"></td> <td><input type="text" name="contact" value="<%=rs.getInt("contactNo")%>"></td> <td><input type="text" name="email" value="<%=rs.getString("email")%>"></td> <td><input type="hidden" name="id" value="<%=rs.getString(1)%>"></td> </tr> <tr> <td><input type="submit" name="Submit" value="Update" style="background-color:#49743D;font-weight:bold;color:#ffffff;"></td> </tr> <% } } catch(Exception e){} %> </table> </form> </form>
continue...
3)UpdateServlet.java:
import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.sql.*; public class UpdateServlet extends HttpServlet { public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); String id=request.getParameter("id"); int no=Integer.parseInt(id); String name=request.getParameter("name"); String address=request.getParameter("address"); int contact=Integer.parseInt(request.getParameter("contact")); String email=request.getParameter("email"); try{ Connection conn = null; Class.forName("com.mysql.jdbc.Driver").newInstance(); conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root", "root"); Statement st=null; st=conn.createStatement(); st.executeUpdate("update employee set name='"+name+"',address='"+address+"',contactNo="+contact+",email='"+email+"' where id='"+no+"'"); response.sendRedirect("/examples/jsp/application.jsp"); } catch(Exception e){ out.println(e); } } } 4)DeleteServlet.java: import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.sql.*; public class DeleteServlet extends HttpServlet { public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); String id=request.getParameter("id"); int no=Integer.parseInt(id); int sumcount=0; try { Class.forName("com.mysql.jdbc.Driver").newInstance(); Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root"); Statement st = conn.createStatement(); st.executeUpdate("DELETE FROM employee WHERE id = '"+no+"'"); response.sendRedirect("/examples/jsp/application.jsp"); } catch(Exception e){} } }
Thanks
Ads