JFrame Reload After MySQL Update
Apr 22, 2014
I've got a similar problem like here: URL...
private void btnAktualisierenActionPerformed(java.awt.event.ActionEvent evt) {
if(sql.conOK) {
tabelle.table.tableChanged(null);
tablePanel.remove(scrollPanel);
// The following fetches the new database data and adds the new jFrame
tableExists = false;
this.getTable();
tabelle.setOptions();
}
else
lblStatusCon.setText("Bitte zur Datenbank verbinden.");
}
this is what I've been doing. It shows only the new jTable when I resize the window.
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Oct 29, 2014
I am developing my first Java application and the database I use is MySQL. I have created two separate buttons; one to insert new data into my database and the other to update the database when changes are made.
Each button is working perfectly, but I now want to combine both functions into just the save button. Thus, whether I am entering new data or modifying existing data, the save button should use an IF ELSE condition to decide whether to use the INSERT or UPDATE command.
My problem is, how do I write this IF ELSE statement? What should be the condition? For example;
IF(what? ){
String sql ="Insert into Table1 (classID,className,counselorID,startDate,endDate) values (?,?,?,?,?)";
}ELSE{
String sql2 = "update Table1 set classID = '"+value1+"',className='"+value2+"',counselorID='"+value3+"',startDate='"+value4+"',endDate='"+value5+"'
where classID = '"+value1+"'";
}
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Feb 9, 2015
I am trying to create an array list without using the built in arrayList class that java has. I need to start the array being empty with a length of 5. I then add objects to the array. I want to check if the array is full and if not add a value to the next empty space. Once the array is full I then need to create a second array that starts empty and with the length of the first array + 1.
The contents of the first array are then copied into the new array without using the built in copy classes java has and then the new array ends up containing 5 elements and one null space the first time round. The first array is then overwritten with the new array containing the 5 elements and the null space. The process then starts again adding values until the array is full which will be 1 more value then recreating the second array empty and the length of the first array + 1. This is my attempt at creating this but I have run into multiple problems where I get only the last value I added and the rest of the values are null:
public class MyArrayList {
public Object arrayList[];
public MyArrayList(Object[] arrayList) {
this.arrayList = arrayList;
[code]...
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May 14, 2014
I have a strange behaviour when trying to update a bean. Here is the edit page:
<h3>Edit Post</h3>
<div class="row">
<h:form>
<div class="small-3 columns">
<label for="right-label" class="right inline">Title</label>
[Code] ....
Here is the bean class:
package com.airial.controllers;
import com.airial.domain.Post;
import com.airial.service.PostService;
import com.ocpsoft.pretty.faces.annotation.URLMapping;
import com.ocpsoft.pretty.faces.annotation.URLMappings;
import org.springframework.beans.factory.annotation.Autowired;
[code]...
postToUpdatet is always NULL. Why the title property is not binded ? What is wrong here ?
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Jul 9, 2014
Can I reload a particular div tag of jsp file from servlet?
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Apr 19, 2014
I am working on a project and for one step, I need to load an array (which in this case, students[]), with the records in another file.
So, should I used the try, catch method?? I am just not sure about the array. I know how to read from a file, but, I didn't get the idea of loading an array.
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Aug 23, 2014
Is there a way to reload the page after uploading the files with the command
<p:fileUpload value="#{excursion_type.main_photo}" mode="advanced" allowTypes="/(.|/)(gif|jpe?g|png)$/" auto="false"
fileUploadListener="#{excursion_type.uploadMultiple}" update="msg" />
Cause the user does not see the lattest photos after uploading need to do reload to see them cause ajax request.
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Apr 23, 2014
When the application starts and the index page is initially loaded, dialog is not shown correctly (panel is not shown) and shows that selected==null. But in debugger prepareSelect seems working correctly and selected is initialised (not null). When I reload page, dialog is shown correctly.
Below are facelets for the page composition and backing bean code.
Register.xhtml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
[Code] .....
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Apr 9, 2015
Like the title says: I'm loading a local HTML file in a WebView which contains Javascript. The script works without any problem when the page is first loaded, but when I reload it or load another local page, Javascript simply stops working silently for no apparent reason and with no error or exception of any kind.
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Mar 19, 2015
I'm beginner with javaFX and i need to change language of the screen. but how to reload the screen when the language was changed. The application have a button where have the language available. I want just refresh screen when the user change language. Here is the start method to show the stage.
@Override
public void start(Stage stage) throws Exception
{
this.stage = stage;
Locale locale = Locale.getDefault();
ResourceBundle rb = ResourceBundle.getBundle("resources/Label",locale);
[Code] .....
Here is the function to change the language(in the same class with start function),the rb is the new ResourceBundle:
public void refresh(ResourceBundle rb)
{
//change the language here
}
1. I don't want to use the resourceBundle to get value in resource file and set label in scene one by one.like following:
this.btnLabel.setText(rb.getString(key.test));
...
2. I don't want to reload the scene,like following:
public void refresh(ResourceBundle rb)
{
try
{
loader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"),rb);
root = (Parent)loader.load();
[Code] .....
So do we have a solution to just set the resourceBundle and reload the scene easier?
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Jan 25, 2013
I have to show more than one images on a jsp page which are frequently refreshed. I am getting images in stream from client end and i want to show them on jsp. How can show them on jsp and refresh them after getting new image from client side?
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Dec 7, 2014
I have a class with static ArrayLists to hold objects such as Members,Players etc.I want to save the class with the arrays so as to reload them again and hold onto the list of objects within those ArrayLists.
The ArrayClass
import java.io.Serializable;
import java.util.ArrayList;
public class ArrayClass implements Serializable {
[code]....
The arrays within the ArrayClass are empty when i reload the application.I cant tell if the arrays are being properly saved or is it in the reloading from file???
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Jun 22, 2014
So I have this line of code...
ioexception11.addChoosableFileFilter(new Jframe());
And when I compile it gives me...
error: constructor Jframe in class Jframe cannot be applied to given types;
ioexception11.addChoosableFileFilter(new Jframe());
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Jan 23, 2015
how we call a jFrame from another jFrame .
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Apr 22, 2015
I don t know why this throw a nullpointerexception. i want to add rows from mysql database to my jlist, this is my method populateJlist().
public void populateJlist() throws SQLException {
conn= DriverManager.getConnection("jdbc:mysql://localhost:3306/agenda","root","");
DefaultListModel m = new DefaultListModel();
statement=conn.prepareStatement("SELECT *FROM apunte");
rs=statement.executeQuery();
String itemCode;
[code]...
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Apr 18, 2014
I'm trying to show mysql data in JSF using this example [URL] .... . I figured out what <h:dataTable value="#{userBean.getUserList()}" var="u" border="1"> must be <h:dataTable value="#{userBean.userList}" var="u" border="1"> but getting error:
09:08:38,654 ERROR [stderr] (http--127.0.0.1-8080-1) at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:307)
09:08:38,654 ERROR [stderr] (http--127.0.0.1-8080-1) at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:101)
[code]...
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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 10, 2014
I've got another project for a course and am stuck. I've debugged and tried to figure out where it is breaking, but I just can't find it. I've used this connection code block as well as the contstructors before, but this just won't work. I've got a tab that should send all of the information to a MySql database upon the click of 'Add Employee'. I've given my connection string, the addEmployee(); code, and if needed I can include the subclass code. I've got a superclass 'Employee' and a subclass 'Salaried' that uses four attributes from 'Employee'.
private void btnAddActionPerformed(java.awt.event.ActionEvent evt) {
addEmployee();
}
public void addEmployee() {
int socialSecurity = 0;
boolean error = false;
[code]....
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May 2, 2015
I am trying to export a DB record to an excel sheet. Below is the code which I tried. I am not getting any error but still only the first record of the table is getting inserted into the excel sheet. But when I try printing, I prints all the records. Below is the code I did to insert records.
for (int i=0;i<ColumnCount;i++) {
System.out.println("Inside for");
Label label=new Label(i,0,rsmd.getColumnName(i+1),cellFormat);
sheet.addCell(label);
WritableCell cell = sheet.getWritableCell(i+1, 0);
System.out.println("Column " + rsmd.getColumnName(i+1)+ " inserted");
cell.setCellFormat(cellFormat);
[code]....
I hope i am making a logical mi stake in the for loop. But still i am unable to locate that.
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Sep 13, 2014
How could i populate jcombobox2 from MySQL depending upon the value of jcombobox1??
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Dec 17, 2014
I have written a java application that retrieves data from a database and display it on a graph. What i want is that the two systems are synchronized in such a way that when we update a value in the database, it is immediately shown on the graph.i have tried to use a refresh button but decided this would increase the overhead.
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Nov 16, 2014
I am unable to connect my javafx scene to mysql database. I get a java.lang.NullPointerException every time. I tried searching everywhere possible but no answers available. This is the Person class (super class for Teacher class):
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
[code].....
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Jul 22, 2014
I am having a problem to connect my .exe file to the database(mysql). I used launch4j to convert the jar file to .exe but the jar file can connect to the database when running inside the dist folder. When I run the .exe I am getting this error: No suitable driver found for jdbc:mysql.
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Jul 27, 2014
try {
is = new FileInputStream(file);
data = new byte[(int) file.length()];
is.read(data);
String extension = "";
int i = file.getName().lastIndexOf('.');
if(i>0)
[Code] ....
Everything works except transferring the image file.
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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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May 1, 2014
I am facing the following scenario:
1- Take information from distinct columns from two different tables - OK
2- Insert this information into a new table.
I have created a ArrayList and inserted all the information that I need but now I am trying to put this ArrayList into the new table and I am not sure how to do it. I have done research and tests but unsuccessfully.
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