Java Database - Inserting Value By User
Apr 25, 2014
So I am working on a DB homework assignment and I am confused in how to implement a users input into the DB; I have to enter some values into a Table that is filled out by a user. It is a basic program, no GUI needed at this point.
I have written the main part but I don't know how I would get the typed value of the data into the SQL Insert Query.
Here is my code (I have a working Database and table with Java DB)
public class AddPeople
{
public static void main(String[] args)throws Exception
{
Scanner kb = new Scanner(System.in);
try
{
Connection conn = DriverManager.getConnection("jdbc:derby:PeopleDB");
[Code] .....
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Feb 11, 2014
I know the below code is supposed to format the FormattedTextField but it doesn't seem to do anything to the form (shown in the picture below). I was wanting, when the form loaded: the text field to look something like this
00/00/2014 - 00:00 am
Where the user is able to
- enter datelike information around the symbol separators ( / or : )
- But where the user could not remove these symbol separators
Java Code:
package datefield;
import javax.swing.JFormattedTextField;
import javax.swing.text.DateFormatter;
[code]....
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Apr 11, 2014
I have requirement, in that I am showing a Datatable, above that table i have form in that i can register a employee, after clicking on submit employee data have to be saved in the database aswell as i have to update datable, so that I can see that registered employee in that Datatable, how can i full fill this requirement. I am using jsf 2.0, ejb3.0,jpa 2.0.
@Override
public List<Employees> getallEmployees() {
System.out.println("all employee fetched");
return (List<Employees>) em.createNamedQuery("Employees.findAll").getResultList();
}
In managed bean I am calling this service as fallow in init method, and i am binding same this. employee list to UI
public String getAllEmployeesfronHr() {
this.employees = customerservice.getallEmployees();
System.out.println(this.employees.size() + "=================size of employee");
return "";
}
For every submit button click i have to query database or is there any mechanism to update List / can we use entity manager in anyway so that we can update Employee List....
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Jul 5, 2014
I want to need auto gerneraion user id for registration form using jsp & servlet with my sql database.
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Jan 18, 2015
I need to take the users input from 2 boxes and reference that to a sqlite database and populate the fields with the data in the database. I know the database code work.
Here is the code for the "user" form;
Java Code:
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTextField;
import java.awt.Font;
[Code] .....
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May 3, 2014
I am making my minor project on a money management website. One problem is occurring:
As we are registering via register.jsp page, the form in that jsp page calls the "saveuser" servlet which saves the user data in the database.
But the data is not getting saved. Following is the code of register.jsp page:
<!DOCTYPE HTML>
<html>
<head>
<title>Virtual Wallet</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
[Code] .....
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May 16, 2014
So, there's a new requirement to log which user issues what database operations. The dumb way is to pass the session object around, but I hope said dumb way is not the only way to achieve this. Hopefully there's another cleaner and smarter way to do this.
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Jul 11, 2014
I can insert data in database, delete aslo using JSP. But facing problem while updating the information saved in database as m using MySQL 2008. I want to see the bring saved in database with particular username into the updateinfo.jsp form.
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Jun 6, 2014
So I'm trying to create a simple user database that I could eventually turn into a login system. I created a simple table on MySQL with a name and address for the sake of simplicity. I tried to create simple statement inside my main method that would connect to my MySQL server and when I run my program I get a ClassNotFoundException from "org.gjt.mm.mysql.Driver"..Here is what I have in my main method thus far:
public static void main(String args[]) {
try {
Class.forName("org.gjt.mm.mysql.Driver"); //Load the driver
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/data", "root", ""); //Connect
/*
conn.createStatement().execute("CREATE TABLE people (" + "id int(64) NOT NULL AUTO_INCREMENT," + "name varchar(255) NOT NULL," + "address varchar(255) NOT NULL," + "UNIQUE (id)," + "FULLTEXT(name, address))");
[code]....
I downloaded Connector/J in the the binary .zip form and extracted it to my C: drive and put the .jar file into my java directories lib folder. I also added the directory of the .jar file into my CLASSPATH and I still get the exception.
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Apr 9, 2014
Write a java program that will ask a user to input grades until the user inputs the sentinel value -1. The program should test each input to determine whether 0<=grade<=100. If the grade entered is within this range, the program should print "Grade accepted;" if not, the program should print "Invalid input".
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Mar 15, 2015
having trouble trying to understand the insertion and removal of Nodes.
I have to insert a new node at the end of the linked nodes, if i insert by terminal : 1, 2, 3. The printed nodes are going to be in the same order, 1,2, 3.
I have done the exercise, but it only prints the last node created and i dont know where its the problem. We did it before with "insert at the beginning", may be the problem is with the print() method in SimpleList.java, but i dont know how to print "backwards".
This is the code:
Node.java
public class Node {
public int infoNodo;
public Node next;
}
SimpleList.java
public class SimpleList {
private Node head;
[code]....
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Feb 3, 2014
I want to insert an image in a jframe...
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Feb 10, 2014
I know the below code is supposed to format the FormattedTextField but it doesn't seem to do anything to the form (shown in the picture below). I was wanting, when the form loaded: the text field to look something like this
00/00/2014 - 00:00 am
Where the user is able to
- enter datelike information around the symbol separators ( / or : )
- But where the user could not remove these symbol separators
Code:
package datefield;
import javax.swing.JFormattedTextField;
import javax.swing.text.DateFormatter;
public class NewJFrame extends javax.swing.JFrame {
public NewJFrame() {
initComponents();
[Code]...
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Mar 21, 2014
What I'm supposed to do is make a method to insert a set of Tiles to the list,i.e.,a detour(make sure that the inserted detouris compatible with thecurrent path so that the resultingpathdoesnot have any gaps). But I'm confused on how to go about doing it. I was thinking of maybe just adding 1 to the current Node.
import java.io.File;
import java.io.FileNotFoundException;
import java.util.List;
import java.util.Scanner;
public class Path {
static Tile startTile;
[code].....
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Feb 21, 2014
I need to insert a newline into a string where a letter follows a non-letter.
Example String: A63B432
I want to insert a newline after A63
I only have the string class available to me.
I'm familiar with regular expressions however I don't know how to use the String class to insert a newline.
I'm guessing the regular expression I'm looking for would be similar to:
[.0-9_][a-zA-Z]
(for . OR didgit OR underscore followed by an alpha character)
But how to insert a newline between the two?
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Feb 12, 2014
So I'm doing a project for my CS class where we have to create a snowman doing something. My picture is of Vince Young in the 2005 Rose Bowl. I'm trying to make the actual video clip from Youtube (do I need to download it? If so I can do that) appear on the scoreboard, but how.
import java.awt.*;
import java.awt.event.*;
import java.awt.Font.*;
class snowBackground
{
public static void drawField(Graphics g, Color field)
[code]....
There are 3 other files that make the actual Snowmen.Also, would I need to download the mp3 sound file seperately and play that, or will inserting the video do both?
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May 3, 2014
In my project I need to add some schedule information into a schedule table in the database..
I am accepting input from a user which direct the parameters here..
I am doing all the required stuff but yet code is not working
There must be some error in date object.
I am using mysql as backend, I have used same kind of code in jsp that is working fine but this is creating error
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.logging.Level;
import java.util.logging.Logger;
[code].....
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Feb 12, 2014
So I'm doing a project for my CS class where we have to create a snowman doing something. My picture is of Vince Young in the 2005 Rose Bowl. I'm trying to make the actual video clip from Youtube (do I need to download it? If so I can do that) appear on the scoreboard. As of right now, this is my background file:
import java.awt.*;
import java.awt.event.*;
import java.awt.Font.*;
class snowBackground {
public static void drawField(Graphics g, Color field) {
Color sky = new Color(95,166,243);
[Code]...
and this is the Driver file (not sure if this is necessary):
import java.awt.*;
import java.awt.event.*;
import java.awt.Font.*;
public class SnowDriverWSB {
public static void main(String args[]) {
GfxApp gfx = new GfxApp();
gfx.setSize(1000,650);
[Code]...
There are 3 other files that make the actual Snowmen. To do this, I need VERY basic steps, as I'm extremely confused and new to Java. Also, would I need to download the mp3 sound file seperately and play that, or will inserting the video do both?
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Nov 26, 2014
I know that for a binary search tree the insert() method is easy. You just kept comparing the values of the nodes, and you would know whether to go left or right depending on the value of the node.However, I am stumped when trying to figure out how to add a node into a normal binary tree where you just keep adding the nodes to the leftmost side, regardless of value.Here is my attempt at the insert() method:
public class RegularTree extends BinaryTree {
public CompleteTree() {
super();
}
public void insert(Comparable item) {
if(this.isEmpty()) {
this.setRoot(new TreeNode(item));
return;
[code]....
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Jun 19, 2014
I am very new to threading. I have a program that calls my api and gets data back in json format. Each request returns a row of data in json format. All together I need to retrieve about 2,000,000 rows a day which means 2,000,000 requests (I understand that this is bad design, but the system was not designed for this purpose it is just what I need to do for the next couple of weeks). When I tried running it on a single thread I was processing about 200 requests a minute which is much too slow. As a result I created 12 threads and I was processing 5500 rows a minutes which was a great improvement.
The problem was only about on average 90% of the rows were inserted into the database as I ran it a few times to make sure. Before each insert printed to a file each URL which was sent and then I checked to see if each insert statement was successful (returned 1 when executed ) and it all seems fine. Every time I run it it inserts about 90% but it does varies and it has never been a consistent number.
Essentially the code starts in main by creating 12 threads. Each thread's creates a run method which calls a new instance of MySQLPopulateHistData and passes a start and end integer which are used in the insert statement for ranges. I have done many system.out.println type testing and can see all the threads do start and all the 12 instances (one instance for each thread) called are executing?
MAIN:
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class MainClass {
public static void main(String[] args) {
[code]....
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Apr 29, 2014
I'm having a problem implementing double hashing when I insert a value into the table i get this for the output:
Insert []. Is there something I'm doing wrong? I'm not getting any errors
public static int size = 0;
public static ArrayList<Integer>[] a;
public static void interactiveMode(Scanner input) {
int menuChoice = 0;
do {
System.out.println("
Interactive Mode:");
[code]....
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Apr 26, 2014
I'm having a problem with double hashing, its supposed to have the user insert an integer into the table and the integer is hashed into the table by the mod of the size of the table so say for instance table size 10 I insert 89 that inserts into 9 because 89%10=9 then i insert 18 that goes into 8 but then once i insert 69 its supposed to collide with index 9 and then uses 7-(69%7) for prime number double hashing...but it just goes into index 9 instead so in 9 it puts 89,69...there's no errors just the wrong output
System.out.print("Enter size of table: ");
int n = input.nextInt();
size=n;
a = new ArrayList[size];
for (int i = 0; i < size; i++) {
a[i] = new ArrayList<Integer>();
[code]....
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Jan 16, 2014
I'm using this try statement to check for errors in input in my Tic Tac Toe game. The problem I have having is I don't understand why this error is happening. It's preventing my code from compiling. I've tried inserting an else statement and multiple brackets at various places with no success.
Java Code:
public void play(){
Scanner input = new Scanner(System.in);
int row, col;
char currPlayer = 'X';
[code]....
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Mar 6, 2014
I have an exercise for practicing insertion sorts which asks me to do this:
1) Write an insertion sort in insert the name Sam into the list from names.txt..I know how to write an insertion sort. how to integrate inserting an element into the method at the same time.This is what I have so far.
Java Code:
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
[code]....
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Dec 10, 2014
I need to view, update and insert records through a jsp page.example: Employee details..If we give an admission number of an employee, and if the admission number exists in the database then the details like Name, DOB, DOR, Address, Contact info should be displayed in the appropriate fields.(simply a select query in SQL) . The fields are editable and if we need to make any changes we can update in that details itself. If admission number doesn't exists means we can insert all the details except the admission number and a temporary admission number is generated and displayed. The problem with this is i can't able to revert it to the same page.
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Jun 14, 2014
public class matrix_mul
{
static int a[][],b[][],k;
public static void main(String o[]) {
k=0;
a=new int[3][3];
b=new int[3][3];
[Code] ....
Well, this is my code for inserting values in 2D array for matrix & then printing it on Command line but it's show ArrayIndexOutOfBoundExcepton 3 or sometimes 1 (on cmd) ....
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