JSP :: Best Way To Retrieve Thousand Rows From Database For Encoding?
Mar 6, 2015
I have to create a webpage such that there is an 'import' and 'save' button.
When the user clicks import button, it will retrieve inventories under PRODUCTS table which contains product title, SRP and Sold by (input field) under his account. Average possible returned rows will be around 1k-5k. If the 'Sold By' has value, it will show as read only. But if not, it will be editable.
Then the user has a list of product IDS printed on a paper that was sold by his employees and he has to scan each product id and put the name of his employee under Sold By and the price sold. This is a manual procedure..
Then after he finishes encoding, he has to click save button to save changes in the db.
what is the best way to implement this? Is it efficient to use js functions such as datatables?
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May 8, 2014
I have one table in mysql in that some rows are there i want to retrieve all rows using servlet and jsp concept and i have done half of the way but not getting output it is showing some info and nothing getting printed on page except columns heading and here is my bean class..
public class TimeDetailBean {
private Time intime;
private Time outtime;
private Date date;
private String eid;
public Time getInTime() {
return intime;
[Code] .....
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Nov 25, 2014
I wish to retrieve just one value from db;
so I use this code:
@Transactional
public long getSequenceSedeB(Long id) {
BigDecimal seqValue = nu
String sql = "SELECT MAX(ID) FROM SEDE_B_ALLEGATI_A WHERE ID_SEDE=:id";
SQLQuery query = getSession().createSQLQuery(sql);
[Code] ....
But it do not works; this is the log.
type.NullableType (NullableType.java:182) - could not read column value from result set: ID; Invalid column name
2014-11-25 14:45:14,476 WARN [btpool0-2] util.JDBCExceptionReporter (JDBCExceptionReporter.java:77) - SQL Error: 17006, SQLState: null
2014-11-25 14:45:14,478 ERROR [btpool0-2] util.JDBCExceptionReporter (JDBCExceptionReporter.java:78) - Invalid column name
But in the database the query
SELECT MAX(ID) FROM SEDE_B_ALLEGATI_A WHERE ID_SEDE=:id
run correctly;
Also I need to rewrite the statement
query.setParameter("id", 923);
in this way
query.setParameter("id", AAA);
where AAA is gotten from out of the procedure;
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Dec 23, 2014
I am trying to retrieve data from my database by joining my tables. So far i have managed to join my four tables in my database and retrieve all the information in that table. Now what i want to do is create a prepared statement in java that allows me to retreive certain data. Here is my joining query.
SELECT student.idNumber,student.names, student.surname,
course.description,
coursemarks.mark,
class.form,class.id
FROM `student`
LEFT JOIN `coursemarks` on student.idNumber = coursemarks.studentid
LEFT JOIN `course` on course.courseid = coursemarks.courseid
LEFT JOIN `class`on student.idNumber = class.studentID;
What I want is to select all the data depending on the class passed and the form passed, e.g a person might decide to select a certain form only or a certain form and class
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Aug 31, 2014
I am creating a small application.I have a jsp font page.i have a jdbc connection code.I have a sample table in my database.i want to retrieve datas from the database and display them in the view page.
My questions are:
-Where do i have to write jdbc code?
-How can i display the retrieved data in the display page?
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Apr 12, 2014
How to insert multiple rows into a database from a jtable and also retrive the same details from database and show it in a jtable.
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Sep 5, 2014
Having trouble figuring out the code in order to find the price column for all items in a ArrayList. So far i have:
private double calculateSubtotal() {
try {
myConnection = DriverManager.getConnection(DATABASE_URL);
myStatement = myConnection.createStatement();
myResultSet = myStatement.executeQuery("SELECT price FROM menu");
[Code] ....
I am not sure if i am going about this the right way or not?
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Apr 1, 2015
I want to retrieve the data from this table given below and insert that data in the database in the next servlet
package com.sk;
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;
[Code] .....
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Aug 25, 2014
On jsp page i have created table with dynamically added rows now i want to insert the data from dynamic row field into database. How would I get the ids of those dynamically created rows to insert into database using hibernate.
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Mar 20, 2015
I am trying to display rows from my database from servlet by passing it to a JSP, but nothing is displayed. I checked the syntax and even the source of the page shows that it gets the data but the rows are not displayed!
My servlet (serv.jsp)
package Pack1;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
[Code]....
My JSP (SP.jsp)
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Search Page</title>
</head>
<body>
<h1>TITLE</h1>
[Code]....
My servlet file is in the Pack1 package under Source Packages and jsp file is under Web Pages.
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Aug 16, 2014
package com;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.*;
@WebServlet(urlPatterns = "/alan", name = "NullS", asyncSupported = true)
public class Null extends HttpServlet {
[Code] ....
When I run this servlet this generates thousand of lines of output. Whats the problem?
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Nov 12, 2014
I'm having trouble hard-coding exercises into a Circuit for a Java App. I am using JFrame forms to do so. I am using the NetBeans program.
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Jan 29, 2015
I need to encode the URL in order to prevent XSS security threat. I don't have to encode the complete URL, I just have to encode the values for query string. How to encode only the values of query string parameters and change it in the URL itself using java. I am planning to do this in a filter.
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Nov 16, 2014
How to read xml tag <br/> without encoding in java. After encoding it becomes <br>. I dont want to encode it. I already tried CDATA[ and StringEscapeUtils.unescapeXml and StringEscapeUtils.unescapeHtml, but unable to change the decode it.
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Mar 14, 2014
import java.io.*;
public class Q2{
public static void main (String[] args) throws IOException,
ClassNotFoundException
[code]....
For this program, i successfully did create an output.txt, but i have some weird characters in front of "hello" when i open it in notepad or wordpad.
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Feb 9, 2014
I have an assignment, similar to ones of seen in the past. The assignment is to take a users text input and to encrypt it using 3 different types of encryptions: Caesar, Transpose, and Reverser. The professor gave us the bulk of the code, and more specifically how to tokenize and shift the letters using Caeser shift. The problem im coming across is that it is not showing anything past the users input. After running it, it just stays there running without showing anything.
Cipher:
package cipher;
import java.util.Scanner;
import java.util.StringTokenizer;
import javax.swing.JOptionPane;
public abstract class Cipher {
public String message;
StringBuilder encrypted_message, decrypted_message;
[Code] ....
The constants have their own separate class, and they appear to work fine. I know that the Transpose and Reverser are incomplete, hence them commented out. But if i cant finish with Caeser first, it wont work at all.
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Mar 22, 2014
This is my program.
public class C4
{
// instance variables - replace the example below with your own
public static void main(String[] args)
{
System.out.println((char)41);
}
}
I wanted to check that the integer 41 is 'A' in UTF-8, although it's ')' in UTF-16 , so I ran the program with javac -encoding UTF-8 C4.java but the result was still ')'.
How do i fix this? Also, do constants for the max values of ASCII and UTF-8 exist in Java? I need to show how many number of bits are used to represent characters in both encodings.
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Oct 15, 2014
If my xml file (shown below as sample) has different employees with id's - is there a way I can get just the id's on there own?
Java Code:
<Employees>
<Employee id="1">
<age>29</age>
<name>Pankaj</name>
<gender>Male</gender>
<role>Java Developer</role>
</Employee>
<Employee id="2">
<age>35</age>
<name>Lisa</name>
<gender>Female</gender>
<role>CEO</role>
</Employee>
</Employees> mh_sh_highlight_all('java');
This is the code Im using - I know at the minute it gets the id details of id 3 but realistically I just want the id's and nothing else
Java Code:
private static String getEmployeeById(Document doc, XPath xpath, int id) {
String env = null;
try {
XPathExpression pathExpression =
xpath.compile("/Employees/Employee[@id=3]"); // line gets everything to do with id 3 but doesn't display the id
[code]....
Can this be achieved using xpath? I've been stuck on it for ages and I can't seem to really find anything to do with it
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Jan 9, 2015
I need to retrieve an image from the MySQL DB and display it in my JSP. The code below retrieves and displays the image with success. But, an exception is thrown:
SEVERE: Servlet.service() for servlet [jsp] in context with path [/FileFinalText] threw exception
[java.lang.IllegalStateException: getOutputStream() has already been called for this response] with root cause
java.lang.IllegalStateException: getOutputStream() has already been called for this response
[code]...
how can I resolve the cause with the getOutputStream() and prevent this exception to occur?
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Mar 7, 2014
String charAt() method returns a particular Character at the specified index in the String.
How is this function implemented internally?. How a particular character can be retrieved from String?.
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Apr 20, 2015
I am pretty new to java and where I should start. What I am trying to do, is to retrieve live information from poker sites as I play, typically my hand and the pot size. Is this possible? I know poker sites probably are very secure, but I can see those things (my hand, and the pot) anyway, I just want it to happen automatically. What I am trying to do, is to create a program that retrieves the information, and then calculate the odds of me winning.
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Apr 2, 2014
I have retrieve the data in listbox from my database already and now again i want to select the data from this listbox and query on it , is it possible?
For Ex i have listbox as follows
<h4>Models For Selected Pattern:</h4>
</br>
<select Name="drop_model" multiple="true">
<%
try {
Class.forName(driver).newInstance();
conn = DriverManager.getConnection(url,username,userPassword);
Statement stmt = conn.createStatement();
[Code] ....
In this listbox some values are retrieved from database as
<option value="xyz">xyz</option>
<option value="pqr">pqr</option>
<option value="abc">abc</option>
<option value="lmn">lmn</option>
I want to select this values from listbox and query on them....
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Jan 20, 2014
<html>
<body>
<form action="login">
Male:<input type ="radio" name ="sex" value="Male"> <br>
Female:<input type = "radio" name="sex" value="Female"> <br>
<input type="submit" value="Enter">
[Code] ....
when the see the result i just get a strange value as "ON" but I am not getting the required value ,I mean Male or Female.
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Mar 3, 2015
I'm trying to iterate through an array of integers and find the start position of the part of the array containing the most consecutive 1s.
For example given the array {1,3,1,1,1,1,5,3,2,1,1}, the method should return 2 and given {1,4,5,1,1,1,5,1} the method should return 3.
So far, I've managed to retrieve the element where the consecutive 1s begin. However, I'm unsure how to get the index of this element and this implementation doesn't work if there is more than one set of consecutive 1s.
public class GetIndex {
public static int getPosition(int[] myArray) {
int index = 0;
int tracker = 0;
int mostOnes = 0;
for(int i = 0; i < myArray.length; i++) {
[Code] .....
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Nov 27, 2014
create table imagedb (usd varchar(255) , image blob , primary key (usd), foreign key (usd) references logindb(user) on update cascade on delete cascade)
Using JSP i am able to upload the file into the blob. But icant retrieve or display;
The HTML Tag :
<table style="margin: 0px; margin-top: 15px;">
<tr>
<td id="photo">
<img src="displayimage" />
</td>
</tr>
The Servlet
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Connection conn = null;
Statement stmt = null;
try {
conn = (Connection) DriverManager.getConnection(DB_URL, USER, PASS);
stmt = (Statement) conn.createStatement();
// constructs SQL statement
Class.forName("com.mysql.jdbc.Driver");
Scanner s = new Scanner(System.in);
[code].....
I am not getting the image.
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Nov 4, 2014
I am creating a shopping list, with each element and object called product from the Item attribute class. Each product object has a description, price, and priority. From user input, I am able to create each product object, and then .add to my arraylist. I know that it successfully adds because I have it printed in each iteration of the do-while loop. Once the user indicates they want to quit, the loop ends. I then want to print each description, price, and quantity but this for loop will only print the last element over and over. Here is what I have:
ArrayList <ItemAttribute> list = new ArrayList<ItemAttribute>();
Scanner keyboard = new Scanner(System.in);
ItemAttribute product = new ItemAttribute();
public void findDescrPrice() {
/**
* Get the item name (description) for each list item
[code]...
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