Sql Query Tool using Servlet : Love Java Bytes

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public interface ResultSetMetaData extends Wrapper
An object that can be used to get information about the types and properties of the columns in a ResultSet object.

public ResultSetMetaData getMetaData() throws SQLException
Retrieves the number, types and properties of this ResultSet object's columns.

QueryServlet.java

 package blog.webideaworld;  
 import javax.servlet.*;  
 import java.sql.*;  
 import java.io.IOException;  
 import java.io.PrintWriter;  
 import javax.servlet.ServletException;  
 import javax.servlet.http.HttpServlet;  
 import javax.servlet.http.HttpServletRequest;  
 import javax.servlet.http.HttpServletResponse;  
 public class QueryServlet extends HttpServlet  
 {  
   protected void doGet(HttpServletRequest request, HttpServletResponse response)  
   throws ServletException, IOException  
   {      
    myForm(request,response);  
   }  
   private void myForm(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException  
   {  
      response.setContentType("text/html");  
      PrintWriter out = response.getWriter();  
      try  
      {  
      out.println("<html><body bgcolor=brown><center><h1>SQL Tool</h1><form method=post>");  
      out.println("<table border=1 bgcolor=green> <tr> <td><textarea rows=15 cols=55 name=t1></textarea></td></tr>");  
      out.println("<tr><td><input type=submit value=execute name=t3></td></tr> </table>");  
      out.println("</form></center></body></html>");  
     }  
      catch(Exception e){}  
   }  
    protected void doPost(HttpServletRequest request, HttpServletResponse response)  
   throws ServletException, IOException  
   {  
     response.setContentType("text/html");  
     PrintWriter out = response.getWriter();  
     myForm(request, response);  
     String query=request.getParameter("t1");  
     ServletConfig config=getServletConfig();  
     ServletContext context=config.getServletContext();  
       String s1=context.getInitParameter("d1");  
       String s2=context.getInitParameter("d2");  
       String s3=context.getInitParameter("d3");  
       String s4=context.getInitParameter("d4");  
     try {  
        Class.forName(s1);  
        Connection con=DriverManager.getConnection(s2,s3,s4);  
        PreparedStatement ps=con.prepareStatement(query);  
        if(query.startsWith("select"))  
        {  
          ResultSet rs=ps.executeQuery(query);  
          ResultSetMetaData rsmd=rs.getMetaData();  
          int columncount=rsmd.getColumnCount();  
          out.println("<center><table bgcolor=yellow border=2>");  
          out.println("<tr>");  
          for(int k=1;k<=columncount;k++)  
          {  
            out.println("<th>");  
            out.println(rsmd.getColumnName(k));  
            out.println("</th>");  
          }  
          out.println("</tr>");  
          while(rs.next())  
          {  
            out.println("<tr>");  
            for(int j=1;j<=columncount;j++)  
            {  
              out.println("<td>");  
              out.println(rs.getString(j));  
              out.println("</td>");  
            }  
            out.println("</tr>");  
          }  
          out.println("</table></center>");  
        }  
      else if(query.startsWith("insert"))  
      {  
       int i=ps.executeUpdate();  
       if(i!=0)  
       out.println("<center>"+i+ "row(s) inserted Successfully"+"</center>");  
      }  
      else if(query.startsWith("delete"))  
        {  
         int i=ps.executeUpdate();  
       if(i!=0)  
       out.println("<center>"+i+ " row(s) deleted Successfully"+"</center>");  
       }  
        else if(query.startsWith("update"))  
        {  
       int i=ps.executeUpdate();  
       if(i!=0)  
        out.println("<center>"+i+ "row(s) updated Successfully"+"</center>");  
        }  
     }  
     catch(Exception e) { }  
   }  
 }

web.xml

 <?xml version="1.0" encoding="UTF-8"?>  
 <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  
   <context-param>  
     <param-name>d1</param-name>  
     <param-value>oracle.jdbc.driver.OracleDriver</param-value>  
   </context-param>  
   <context-param>  
     <param-name>d2</param-name>  
     <param-value>jdbc:oracle:thin:@localhost:1521:xe</param-value>  
   </context-param>  
   <context-param>  
     <param-name>d3</param-name>  
     <param-value>hr</param-value>  
   </context-param>  
   <context-param>  
     <param-name>d4</param-name>  
     <param-value>hr</param-value>  
   </context-param>  
   <servlet>  
     <servlet-name>QueryServlet</servlet-name>  
     <servlet-class>blog.webideaworld.QueryServlet</servlet-class>  
   </servlet>  
   <servlet-mapping>  
     <servlet-name>QueryServlet</servlet-name>  
     <url-pattern>/Queryrun</url-pattern>  
   </servlet-mapping>  
   <session-config>  
     <session-timeout>  
       30  
     </session-timeout>  
   </session-config>  
   <welcome-file-list>  
     <welcome-file>Queryrun</welcome-file>  
   </welcome-file-list>  
 </web-app>

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