Help this poor guy

Question

Hi Herewith I have enclosed the code.. I am not sure where i am going wrong..moreover i am very new to this technologies.. i need to finish this by tonight.. anyone helps that will be great..
here is my problem.. i need to check a rebate id which exists in the database.. if it exists I have to update the value and if doesn't exits i have to insert a new row..
My jsp will contails 10 rows.. Once after submit.. I have to check with the database whetehr that rebate_sku_num exits.. if exits i need to update that row.. if not i have to insert a new record.. here is my code.. please give some solution.. thanks
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.SingleThreadModel;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import java.io.IOException;
import java.sql.ResultSet;
import java.io.*;
import java.util.*;
import java.util.Date;
import java.text.*;
public class AddRebate extends HttpServlet implements SingleThreadModel {
public void init(ServletConfig servletconfig) throws ServletException {
super.init(servletconfig);
public void doPost(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)
throws ServletException, IOException {
HttpSession session;
session = httpservletrequest.getSession(true);
String user_name;
String divisionCode;
String rebate_sku_num[];
String selectedMonth;
String amount[];
String message = "";
String Query="";
String RebateId="";
boolean flag = true;
// from here
Calendar todaysdate = new GregorianCalendar();
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
SimpleDateFormat sdf1 = new SimpleDateFormat("MM/dd/yyyy HH:MM:SS");
System.out.println("today's date: " + sdf.format(todaysdate.getTime()));
String entryDate = sdf.format(todaysdate.getTime());
String entryDate1 = sdf1.format(todaysdate.getTime());
System.out.println("entering date is " +entryDate) ;
System.out.println("entering date is " +entryDate1) ;
// to here
user_name = (String) session.getAttribute("user_name");
divisionCode = (String) session.getAttribute("division_code");
selectedMonth = httpservletrequest.getParameter("selectedMonth");
rebate_sku_num = httpservletrequest.getParameterValues("rebateId");
amount = httpservletrequest.getParameterValues("amount");
System.out.println("AddRebate : doPost() : selectedMonth = " + selectedMonth);
System.out.println("AddRebate : doPost() : rebate_sku_num = " + rebate_sku_num);
System.out.println("AddRebate : doPost() : amount = " + amount);
flag =true;
if (flag) {
// from here
try {
String s = "select REBATE_SKU_NUM from EASMSA_REBATE_SKU_DETAILS_TB";
System.out.println("AdjustmentServlet : doGet() : getting maximum adjustment ID query : " + s);
ResultSet resultset = DatabaseConnection.executeQuery(s);
if (resultset != null) {
while (resultset.next()) {
RebateId = resultset.getString("REBATE_SKU_NUM");
System.out.println("the REBATE_SKU_NUM is " + RebateId);
}else{
System.out.println("AdjustmentServlet : doGet() : getting maximum adjustment ID : resltset is null " );
} catch (Exception exception1) {
System.out.println("AdjustmentServlet : doGet() : exception in getting max of adjustment id");
exception1.printStackTrace();
// to herer
for (int i = 0; i < rebate_sku_num.length; i++) {
if ((rebate_sku_num != RebateId)) {
System.out.println("get the values" +rebate_sku_num);
System.out.println("get the values" + RebateId);
Query = "INSERT INTO EASMSA_REBATE_SKU_DETAILS_TB " +
"( REBATE_SKU_NUM, REBATE_DATE, REBATE_AMT, CREATED_BY," +
"CREATION_DATE, LAST_UPDATED_BY, LAST_UPDATE_DATE ) VALUES (" +
"'" + rebate_sku_num + "', " +
"TO_Date( '" + "30/" + selectedMonth + "', 'dd/MM/YYYY HH:MI:SS AM'), " +
"'" + amount + "' , '" + user_name + "'" +
", TO_Date( '" + entryDate + "', 'MM/dd/YYYY HH:MI:SS AM')" +
", '" + user_name + "'," +
" TO_Date( '" + entryDate + "', 'MM/dd/YYYY HH:MI:SS AM'))";
System.out.println("query is executed" +Query);
}else if ((rebate_sku_num == RebateId )){
Query = "update EASMSA_REBATE_SKU_DETAILS_TB set REBATE_AMT=" + amount + " where REBATE_SKU_NUM='" + rebate_sku_num + "'";
System.out.println("query is executed for updation" +Query);
try {
if (DatabaseConnection.executeUpdate(Query) == 0) {
System.out.println(" AddRebate : doPost() : rollback: error in executing update query= " + Query);
DatabaseConnection.rollBack();
message = "Some problem in updating transactions. Please try again later.";
flag = false;
break;
} else {
System.out.println("AddRebate : doPost() : update sucessfull");
message = "Rebate Transactions has been updated.";
flag = true;
} catch (Exception ex) {
System.out.println("AddRebate : doPost() : exception in update query");
message = "Some problem in updating transactions. Please try again later.";
flag = false;
ex.printStackTrace();
session.setAttribute("message", message);
httpservletresponse.sendRedirect("Welcome1.jsp?s=y");
return;

Answer 1

Hi Here my code is, I am able to add one by one records... but if the record is there still it is trying to inser and throwing some execption. Because that rebate_sku_num is the primary key..
I want to add multiple records.. by cecking rebate_sku_num is present in the table or not. It is not I need to insert a new row.. else I need to update the record.
Thanks
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.SingleThreadModel;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import java.io.IOException;
import java.sql.ResultSet;
import java.io.*;
import java.util.*;
import java.util.Date;
import java.text.*;
public class AddRebate extends HttpServlet implements SingleThreadModel {
    public void init(ServletConfig servletconfig) throws ServletException {
        super.init(servletconfig);
    public void doPost(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)
            throws ServletException, IOException {
        HttpSession session;
        session = httpservletrequest.getSession(true);
        String user_name;
        String divisionCode;
        String rebate_sku_num[];
        String selectedMonth;
        String amount[];
        String message = "";
        String Query="";
        String RebateId=""; 
        boolean flag = true;
        Calendar todaysdate = new GregorianCalendar();
        SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
        SimpleDateFormat sdf1 = new SimpleDateFormat("MM/dd/yyyy HH:MM:SS");     
        System.out.println("today's date: " + sdf.format(todaysdate.getTime()));
        String entryDate = sdf.format(todaysdate.getTime());
        String entryDate1 = sdf1.format(todaysdate.getTime());
        user_name = (String) session.getAttribute("user_name");
        divisionCode = (String) session.getAttribute("division_code");
        selectedMonth = httpservletrequest.getParameter("selectedMonth");
        rebate_sku_num = httpservletrequest.getParameterValues("rebateId");
        amount = httpservletrequest.getParameterValues("amount");
        System.out.println("AddRebate : doPost() : selectedMonth = " + selectedMonth);
        System.out.println("AddRebate : doPost() : rebate_sku_num = " + rebate_sku_num);
        System.out.println("AddRebate : doPost() : amount = " + amount);
   flag = true;
        for (int z = 0; z < rebate_sku_num.length && flag; z++) {
            try {
                     flag=false;
                String s = "select REBATE_SKU_NUM from EASMSA_REBATE_SKU_DETAILS_TB where REBATE_SKU_NUM ='" + rebate_sku_num[z] + "'";
                System.out.println("AdjustmentServlet : doGet() : checking sku validity query  = " + s);
                ResultSet resultset = DatabaseConnection.executeQuery(s);
                if (resultset != null) {
                    while (resultset.next()) {
                        RebateId = resultset.getString("REBATE_SKU_NUM");
                        flag = true;
        if ((rebate_sku_num[z] != RebateId)) {
                System.out.println("get the values" +rebate_sku_num);
                 System.out.println("get the values" + RebateId);
                   Query = "INSERT INTO EASMSA_REBATE_SKU_DETAILS_TB " +
                            "( REBATE_SKU_NUM, REBATE_DATE, REBATE_AMT, CREATED_BY," +
                            "CREATION_DATE, LAST_UPDATED_BY, LAST_UPDATE_DATE ) VALUES (" +
                            "'" + rebate_sku_num[z] + "',  " +
                            "TO_Date( '" + "30/" + selectedMonth + "', 'dd/MM/YYYY HH:MI:SS AM'), " +
                            "'" + amount[z] + "' , '" + user_name + "'" +
                            ",  TO_Date( '" + entryDate + "', 'MM/dd/YYYY HH:MI:SS AM')" +
                            ", '" + user_name + "'," +
                             "  TO_Date( '" + entryDate + "', 'MM/dd/YYYY HH:MI:SS AM'))";
                    System.out.println("query is executed" +Query);
              }else if ((rebate_sku_num[z] == RebateId )){
                   Query = "update EASMSA_REBATE_SKU_DETAILS_TB set REBATE_AMT=" + amount[z] + " where REBATE_SKU_NUM='" + rebate_sku_num[z] + "'";
                   System.out.println("query is executed for updation" +Query);
                } else {
                    System.out.println("AdjustmentServlet : doGet() : checking for sku validity : resultset null");
                   // message = "SKU '" + sku[z] + "' of customer '" + customer[z] + "' and location '" + location[z] + "' is not valid.";
                    message = "SKU '" + rebate_sku_num[z] + "' is not valid.";
                    flag = false;
            } catch (Exception exception1) {
                System.out.println("AdjustmentServlet : doGet() : exception in checking validity of SKU");
                exception1.printStackTrace();
              //  message = "SKU '" + sku[z] + "' of customer '" + customer[z] + "' and location '" + location[z] + "' is not valid.";
               message = "SKU '" + rebate_sku_num[z] + "' is not valid.";
                flag = false;
               try {
                    if (DatabaseConnection.executeUpdate(Query) == 0) {
                        System.out.println(" AddRebate : doPost() : rollback: error in executing update query= " + Query);
                        DatabaseConnection.rollBack();
                        message = "Some problem in updating transactions. Please try again later.";
                        flag = false;
                       // break;
                    } else {
                        System.out.println("AddRebate : doPost() : update sucessfull");
                        message = "Rebate Transactions has been updated.";
                        flag = true;
                } catch (Exception ex) {
                    System.out.println("AddRebate : doPost() : exception in update query");
                    message = "Some problem in updating transactions. Please try again later.";
                    flag = false;
                    ex.printStackTrace();
        session.setAttribute("message", message);
        httpservletresponse.sendRedirect("Welcome1.jsp?s=y");
        return;
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