Latest Tutorials| Questions and Answers|Ask Questions?|Site Map



Home Answers Viewqa JSP-Servlet How to delete the row from the Database by using while loop in servlet
Login         

View Questions and Answers by Category

Advertisements


 
Have Programming Question? Ask it here!
 
 
 


Ramanjaneyulu Manam
How to delete the row from the Database by using while loop in servlet
1 Answer(s)      3 years and 7 months ago
Posted in : JSP-Servlet


Dear Sir/Madam,

I am trying to delete the one user data in the Oracle SQL server database by using Servlet program (Tomcat server).

In Database table have 6 users details are there.

Table name is ‚??JDUSER‚?? and columns are USERS (Char), PASS (Varchar2) and CODE (Varchar2). I am trying to delete 4th user details.

While loop is not terminate, in while loop why If condition not working it checking until end of the table and gives else black statement. So what is my mistake and please give the solution to me.

My HTML code is:

<html>
<title> Delete Page</title>
  <form action="JdbcDeleteServlet" method="post">
    <center><font color='red'>
     <h2> Remove Data</h2><br/></font>
        User Name : <input type="text" name="uname" ><br/><br/>
        Password : <input  type="password" name="pwd"><br/><br/>
        Verification code : <input type="text" name="code"><br/><br/>
        <input type="submit" value="Delete"/>
    </center>
  </form>
</html>


My Database table is:

My JavaServlet Program is:

import java.lang.*;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class JdbcDeleteServlet extends HttpServlet
{
    String dbn,dbp,dbco;
    String un,up,uco;
    boolean flag=false;
    public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException
    {
        try
        {
            response.setContentType("text/html;charset=UTF-8");
            PrintWriter out = response.getWriter();
            response.setContentType("text/html");
            un=request.getParameter("uname");
            up=request.getParameter("pwd");
            uco=request.getParameter("code");
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            Connection c=DriverManager.getConnection("jdbc:odbc:hari","raman","raman");
            Statement s=c.createStatement();
            s.execute("select *from jduser");
            ResultSet rs=s.getResultSet();
            while(rs.next())
              {
                  dbn=rs.getString("users");
                  dbp=rs.getString("pass");
                  dbco=rs.getString("code");
                  if(un.equals(dbn)&&up.equals(dbp)&&uco.equals(dbco))          // another formate  if((un==dbn)&&(up==dbp)&&(uco==dbco))
                    {
                        s.executeUpdate("delete jduser where users='"+un+"'");
                        flag=true;
                        break;
                    }
              }
              if(flag==true)
                out.println("<font color=green>"+dbn+" user Data deleted successfully");
              else
                out.println("<font color=red>Sorry "+un+" user data is Not Available");
            s.close();
            c.close();
            out.close();
        }
        catch(IOException e)
        {
            System.out.println(e.getMessage());
        }
        catch(SQLException e)
        {
            System.out.println(e.getMessage());
        }
        catch(ClassNotFoundException e)
        {
            System.out.println(e.getMessage());
        }
    }
}

So finally where is my mistake and in while loop why if loop not working. please give me solution. It is Urgent...


Advertisement
View Answers

May 18, 2011 at 6:52 PM


When you retrieve the data from the Database by using Servlet (JDBC). you entered 'ramanujan' is 9 character but in the database 'ramanujan ' is 15 characters because remaining letters it consider as spaces so you use trim() then spaces are trimmed. it will working good.

trim( )

The trim( ) method returns a copy of the invoking string from which any leading and trailing whitespace has been removed. It has this general form:

String trim( )

Here is an example:

String s = "    Hello World    ".trim();

This puts the string ‚??Hello World‚?? into s.

while(rs.next())
       {
                  dbn=rs.getString("users");
                  dbp=rs.getString("pass");
                  dbco=rs.getString("code");
                   dbn=dbn.trim();
                   dbp=dbp.trim();
                   dbco=dbco.trim();
                  if(un.equals(dbn)&&up.equals(dbp)&&uco.equals(dbco))  
                    {
                        s.executeUpdate("delete jduser where users='"+un+"'");
                        flag=true;
                        break;
                    }
        }


Related Tutorials/Questions & Answers:
How to delete the row from the Database by using while loop in servlet
How to delete the row from the Database by using while loop in servlet ... server database by using Servlet program (Tomcat server). In Database table.... It is Urgent...  When you retrieve the data from the Database by using
How to delete the row from the Database by using servlet
How to delete the row from the Database by using servlet  Dear Sir...: Delete row from database using servlet   In that link solution... then the user data to be delete from the database table. Assume in Database table have
Advertisements
Delete a row from database by id
Delete a row from database by id  I m creating a small application using servlet. There is a form (index.jsp)having 10 fields on submitting the form...) for "DELETE" AND "UPDATE". On clicking delete which is hyper link that particular row
delete row from a table using hibernate
delete row from a table using hibernate  //code in java file String hql="delete from CONTACT c where ID=6"; Query query=session.createQuery... [delete from CONTACT] int i=query.executeUpdate
how to delete a row in sql without using delete command.
how to delete a row in sql without using delete command.  how to delete a row in sql without using delete command. thanks in advance
sqlite database delete row
sqlite database delete row  How to delete row from SQLite Database?    NSString *updateSQL = [NSString stringWithFormat: @"DELETE FROM aListDB WHERE id='%@'",details.ids
delete multiple row using checkbox
delete multiple row using checkbox  how to delete multiple row in a table which is connected to database using checkbox
delete multiple row using checkbox
delete multiple row using checkbox  how to delete multiple row in a table which is connected to database using checkbox
delete row from a table in hibernate
delete row from a table in hibernate  is there method to delete row in a table using hibernate like save(-) to insert row
delete row using id
delete row using id  package pkg2; import org.hibernate.Query; import... = "delete from Insurance insurance where id = 2"; Query query = sess.createQuery...()); } } } this is the code m using . Error is -query must begin with SELECT or FROM
how to display a table from database using servlet
how to display a table from database using servlet  how to display a table with values from servletpage   Hi Friend, Please go through the following link: http://roseindia.net/jsp/servlet-jsp-data-list.shtml Thanks
JDBC ResultSet Delete Row Example
JDBC ResultSet Delete Row Example: Learn how to delete row using ResultSet. We are also used ResultSet object with update capability for delete rows from.... 6. Finally call deleteRow() ResultSet method for delete the current row form
how to delete specified coloumn from database(MS Access) by using windows application
how to delete specified coloumn from database(MS Access) by using windows application  how to delete specified coloumn from database(MS Access) by using c# windows application
How to write a loop and a while loop
How to write a loop and a while loop  How do I write a 1 loop and a 1 while loop for the example code: public boolean isTheFirstOneBigger (int num1, int num2) { if (num1 > num2) { return true
How to insert or delete records in MS access database using jsp - JSP-Servlet
How to insert or delete records in MS access database using jsp  Hi friends please provide me a solution that i insert or delete record from a database using java server pages. I used the microsoft access 2003 database. PlZ
delete multiple row using checkbox
delete multiple row using checkbox  delete multiple row using... fields bookid,author and title in the database. 1) Create book.jsp <%@page...=null; st=conn.createStatement(); rs = st.executeQuery("select * from book"); int
delete an item from database
delete an item from database  how to delete an item from the database using jsp
How to insert image in sql database from user using servlet
How to insert image in sql database from user using servlet  pls tell me accept image from user and insert image in sql server 2005 database using servlet and jsp
Using while loop to loop through a cursor
Using while loop to loop through a cursor  ... while loop to loop through a cursor'. The Example create a table Stu_Table... that establish the result set. The While loop check a condition
Delete a Specific Row from a Database Table
Delete a Specific Row from a Database Table   ..., and in this section we are going to do the same that is, how to delete a specific row... the connection we are going to delete a specific row from the table. If the row
How to get the data from the database using Servlet or JSP program
How to get the data from the database using Servlet or JSP program  ... the problem   Get data from database using servlet Retrieve data from database using JSP Get data from database using JSP
How to update,Delete database values from jtable cells ..
How to update,Delete database values from jtable cells ..  hello Sir... from database into jtable of a jpanel.. Now Sir, According to my need i have... to a particular cell will be updated into database and if we want to delete
delete row
delete row  how to delete row using checkbox and button in php...("sourabh", $link); $rows=mysql_query("select * from sonu"); $row=mysql...;/tr> <?php while($row=mysql_fetch_array($rows)) { ?> <tr>
How to Open Picture From M.S. Access Database using Java Servlet ?
How to Open Picture From M.S. Access Database using Java Servlet ?  ... Database But i m still not able to open this picture through Java using M.S. Access and i wants to open this Picture On Web Browser using Java Servlet anybody can
java code using while loop
java code using while loop  
Delete row and column from table through java code
will see how to delete row and column from given table through java code. Java code... Delete row and column from table through java code...) from stu_info"); rs.next(); // This sql query delete the row having
Delete points from database
Delete points from database  I have a polygon on a web page and a delete button. The polygon is saved in the database in one table and in another...: mysqlquery("DELETE FROM polygon WHERE ID=".$GET['ID']."") or die(showsqlerrors(mysql
How to update,Delete database values from jtable cells ..
How to update,Delete database values from jtable cells ..  Hello Sir... from database to jtable .Now as per my requirement i need to update and delete the database records from the table cells by entering new values there only
How to update,Delete database values from jtable cells ..
How to update,Delete database values from jtable cells ..  Hello Sir, I am working on a project in which i have to fetch the values from database to jtable .Now as per my requirement i need to update and delete the database
How we delete a data of database from front end jsp page
How we delete a data of database from front end jsp page   I make a website and featch a data from data base and now i want that a delete button put... deleted from jsp page as well as from database.I used mysql and jsp. Please help me
Update delete perticular row from brower on link - Struts
Update delete perticular row from brower on link   how can update and delete perticular row from List of employee in brower format are ramesh... page with textbox update , if delete click then that row also delete from
 

 

 

DMCA.com