📄 sqlacess.java
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package com.ynu.Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import Bean.SQLTell;
import Bean.dbConnection;
public class SQLAcess extends HttpServlet {
/**
* Constructor of the object.
*/
public SQLAcess() {
super();
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String sqlStatement=request.getParameter("input");
HttpSession session=request.getSession();
/**out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
**/
SQLTell tell=new SQLTell();
dbConnection conn=new dbConnection();
int sqlTell=tell.tell(sqlStatement);
conn.getConnect("registration", "root", "123");
ResultSet rs;
if(sqlTell==1)
{
rs=conn.selectSql(sqlStatement);
session.setAttribute("result", rs);
response.sendRedirect("http://localhost:8080/midterm/showInfo.jsp");
}
else if(sqlTell==2)
{
boolean panduan=conn.deleteSql(sqlStatement);
response.sendRedirect("http://localhost:8080/midterm/index.jsp");
}
else
{
boolean panduan;
panduan=conn.deleteSql(sqlStatement);
if(panduan)
{
out.print("sucessful");
}
else
{
out.print(conn.message());
}
}
}
}
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