Im creating an inventory system for our project in school but I stumbled across a problem, I have two forms, when I click the add button in my firstform called mainform, a new form will show the addjframe form, I then put entries, but when I click the add button in the addjframe form the data is in my ms-access database, but my jtable is blank
I tried making my table public static so that it can be called on my second form
heres the code for for my table on the mainform
public static void AddRowToJTable(Object[] dataRow)
{
DefaultTableModel dtm ;
dtm= (DefaultTableModel)jTable1.getModel();
dtm.addRow(dataRow);
dtm.setRowCount(0);
}
heres the code for my add button on the Addjframe form/second form
private void btnaddActionPerformed(java.awt.event.ActionEvent evt) {
String title = txttitle.getText();
String author = txtauthor.getText();
String date = txtdate.getText();
String genre = txtgenre.getText();
try {
Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
Connection con = DriverManager.getConnection("jdbc:ucanaccess://D:/elibrary1.accdb");
Statement st = con.createStatement();
st.execute("INSERT INTO libtable(Title,Author,Dateadded,Genre) VALUES ('"+title+"','"+author+"','"+date+"','"+genre+"')");
String sql = "Select * from libtable";
ResultSet rs = st.executeQuery(sql);
while (rs.next()) {
mainform.AddRowToJTable(new Object[]{rs.getString(1),rs.getString(2),rs.getString(3),rs.getString(4)});
}
}
catch (Exception e) {
System.out.print(e.getMessage());
}
}
It should show the entries on my jtable i dont know whats wrong with my code, ive been stuck on this for days, I dont receive any error messages, because the entries are being put in my ms-access database its just that it doesnt show on my jtable
Any help would be appreciated!
here's my first form the table is not showing anything when i click add on my second form
this is my second form to add data in the database
here is my ms-access database showing my recently entered data at the bottom
I want to delete the data from table view and from SQL,after i tried almost everything i don't know where the problem is?
public void DeleteButton(ActionEvent event) throws SQLException,
ClassNotFoundException{
String sql = "Delete from Add_NewOrder where No=?";
try{
pst = con.prepareStatement(sql);
pst.setString(1, comboBoxTable.getValue());
int i = pst.executeUpdate();
if(i==1){
Alert alert = new Alert(AlertType.ERROR);
alert.setTitle("Information Dialog");
alert.setHeaderText(null);
alert.setContentText("Te dhenat nuk jane shlyer!");
alert.showAndWait();
loadDataFromDataBase();
clearTextField();
}
}catch(SQLException ex){
Logger.getLogger(AddNewOrderController.class.getName()).log(Level.SEVERE,null,ex);
}
}
Which part isn't working?
I see lots of problems with your code:
Connection and PreparedStatement appear to be class variables. I'd keep PreparedStatement in method scope and close it in a finally block.
Method is doing two things: database and Swing UI change. Separate them into individual classes and methods. Test them separately and combine them when both are working.
Mixing UI and processing code in the same class is something I try to avoid. I'd partition them into separate classes.
in a swing button I set a action that it execute delete query and execute another class.
here's my code:
JButton btnScanMyPc = new JButton("SCAN MY PC");
btnScanMyPc.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
try{
String q="DELETE FROM `search` WHERE 1=1 ";
PreparedStatement st=connection.prepareStatement(q);
ResultSet rs=st.executeQuery();
ReadDir rd = new ReadDir();
ReadDir.main(null);
}
catch(Exception e)
{JOptionPane.showMessageDialog(null, e);}
}
when i execute this query in database it works perfectly. but in java it shows some error like:
java.sql.SQLException: Can not issue data manipulation Statement with executeQuery().
You have to use executeUpdate() instead of executeQuery() for data manipulation like Insert,Update or Delete.
try this one
"DELETE FROM search WHERE 1=1 "
st.executeUpdate(q);
I am having problem in connecting to mysql database when I am using this code.I have already checked that port number is 3128.So there is no issue about that.I checked it and I think problem is in
connection= DriverManager.getConnection("jdbc:mysql://localhost:3128/gcc","root", "root");
There is no error when compiling.Can someone help me with this?
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.sql.*;
//import java.net.*;
public class Main extends Applet implements ActionListener
{
TextArea tarea;
Button bsubmit;
public void init()
{
setBackground(new Color(0,0,0));
setForeground(Color.white);
Label l1=new Label("Write your code : ");
l1.setFont(new Font("lucida console",Font.PLAIN,25));
l1.setSize(200,30);
tarea=new TextArea();
tarea.setFont(new Font("lucida console",Font.PLAIN,18));
tarea.setForeground(new Color(0,0,0));
tarea.setSize(600,250);
bsubmit=new Button("Submit");
bsubmit.setFont(new Font("lucida console",Font.PLAIN,15));
bsubmit.setBackground(new Color(255,255,255));
bsubmit.setForeground(new Color(0,0,0));
bsubmit.setSize(100,30);
add(l1);
add(tarea);
add(bsubmit);
setLayout(null);
l1.setLocation(40,40);
tarea.setLocation(40,100);
bsubmit.setLocation(40,400);
bsubmit.addActionListener(this);
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==bsubmit)
{
Connection connection=null;
try
{
Class.forName("com.mysql.jdbc.Driver");
connection= DriverManager.getConnection("jdbc:mysql://localhost:3128/gcc","root", "root");
Statement stmt = connection.createStatement();
stmt.executeUpdate("CREATE TABLE test2 (code VARCHAR(254))");
}
catch (Exception e) {}
}
}
}
Java database drivers are the worst thing. I remember, I had my first JDBC driver (or let's say: a working transaction;) to be installed within "only" 2 days, and I know a guy who had two weeks, lol.
In most of the time the very last issue is a SQL problem. Because you need to give the rights to the user as "username"#"IP". You find the user information in the database information_schema in the table user_privileges. There exist enough tutorials how to handle them, but I like 'username'#'%' to get all privileges in a test environment. smile
This may help you: http://dev.mysql.com/doc/refman/5.1/de/adding-users.html
Yeah, those damn SQL rights... ;D
#Luiggi: That's certainly no silly question! I had hours to find that out!! I mean, which beginner knows that the Java sql classes are only xxxxxxx interfaces with no implemented code?! %D
EDIT
And anyway:
Class.forName("...driverblabla...");
Does this code line look like Java? Nooo, its a xxxxxx compiler hack or whatever! But it works, it really DOES something!!
Oh, but for certain driver implementations this won't work, you need this:
Class.forName("...driverblabla...").newInstance();
LMAO!
#Abhinav: Add this line above your getConnection-line:
Class.forName("com.mysql.jdbc.driver").newInstance();
And don't think one second about what it exactly does (I know it, but...let's screw it ;)
The concept of my code is that, it will initially retrieve distinct names from a column 'tname' of my access database table 'try'. It will add those items in a combobox. Once we select an item in the combo box, the data of the row containing tname as the selected item is retrieved and showed in textfields. Then I will make some changes to the text field content. After that, if I click 'Save' button, then all the data of the row containing tname as the selected combobox item must be updated with the new content in the textfields.
Everything goes fine, except the last one. When I click 'save' it considers only the previous text(the one intially retrieved from the database when we select combobox) and not the changes made to it. Kindly help me to diagnose the problem.
Thanks in advance.
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
import java.util.Date;
import java.sql.*;
import java.text.*;
public class gut implements ActionListener
{
JComboBox ctn;
JTextField cm,exd,stk,cst,sup,snum,r;
String stn,scm,sexd,sst,scst,ssup,ssnum,sr,icm,iexd,istk,icst,isup,isnum,ir;
JLabel lt,lc,le,ls,lcs,lsp,lspn,lr;
JButton s;
JFrame gp=new JFrame();
public gut()
{
gp.setSize(500,500);
gp.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gp.setLayout(null);
lt=new JLabel("Tablet Name",JLabel.RIGHT);
lc=new JLabel("Composition",JLabel.RIGHT);
le=new JLabel("Expiry Date (dd/mm/yyyy)",JLabel.RIGHT);
ls=new JLabel("Stock",JLabel.RIGHT);
lcs=new JLabel("Cost",JLabel.RIGHT);
lsp=new JLabel("Supplier",JLabel.RIGHT);
lspn=new JLabel("Supplier Number",JLabel.RIGHT);
lr=new JLabel("Rack",JLabel.RIGHT);
lt.setBounds(100,120,120,20);
lc.setBounds(100,140,120,20);
le.setBounds(60,160,160,20);
ls.setBounds(100,180,120,20);
lcs.setBounds(100,200,120,20);
lsp.setBounds(100,220,120,20);
lspn.setBounds(100,240,120,20);
lr.setBounds(100,260,120,20);
ctn=new JComboBox();
cm=new JTextField();
exd=new JTextField();
stk=new JTextField();
cst=new JTextField();
sup=new JTextField();
snum=new JTextField();
r=new JTextField();
ctn.setBounds(240,120,120,20);
cm.setBounds(240,140,120,20);
exd.setBounds(240,160,120,20);
stk.setBounds(240,180,120,20);
cst.setBounds(240,200,120,20);
sup.setBounds(240,220,120,20);
snum.setBounds(240,240,120,20);
r.setBounds(240,260,120,20);
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn=DriverManager.getConnection("jdbc:odbc:vasantham","","");
Statement st=conn.createStatement();
ResultSet rs=st.executeQuery("select DISTINCT tname from try");
while(rs.next())
{
ctn.addItem(rs.getString("tname"));
}
conn.close();
}
catch(Exception e)
{
}
gp.add(lt);gp.add(ctn);
gp.add(lc);gp.add(cm);
gp.add(le);gp.add(exd);
gp.add(ls);gp.add(stk);
gp.add(lcs);gp.add(cst);
gp.add(lsp);gp.add(sup);
gp.add(lspn);gp.add(snum);
gp.add(lr);gp.add(r);
ctn.addActionListener(this);
s=new JButton("Save");
s.setBounds(200,300,100,20);
gp.add(s);
s.addActionListener(this);
gp.setVisible(true);
}
public void actionPerformed(ActionEvent evt)
{
String act=evt.getActionCommand();
String scb=(String)ctn.getSelectedItem();
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn=DriverManager.getConnection("jdbc:odbc:vasantham","","");
Statement st=conn.createStatement();
ResultSet rs=st.executeQuery("select * from try where tname='"+scb+"'");
SimpleDateFormat formatter=new SimpleDateFormat("dd/MM/yyyy");
while(rs.next())
{
icm=rs.getString("composition");
iexd=formatter.format(rs.getDate("exdate"));
istk=Integer.toString(rs.getInt("stock"));
icst=rs.getString("cost");
isup=rs.getString("sup");
isnum=rs.getString("supnum");
ir=rs.getString("rack");
}
cm.setText(icm);
exd.setText(iexd);
stk.setText(istk);
cst.setText(icst);
sup.setText(isup);
snum.setText(isnum);
r.setText(ir);
conn.close();
}
catch(Exception e)
{
System.out.println(e);
}
if(act.equals("Save"))
{
scm=cm.getText();
sexd=exd.getText();
sst=stk.getText();
scst=cst.getText();
ssup=sup.getText();
ssnum=snum.getText();
sr=r.getText();
System.out.println(scm+","+sexd+","+sst+","+scst+","+ssup+","+ssnum+","+sr);
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn=DriverManager.getConnection("jdbc:odbc:vasantham","","");
PreparedStatement ps=conn.prepareStatement("UPDATE try set composition=?,exdate=?,stock=?,cost=?,sup=?,supnum=?,rack=? where
tname=?");
ps.setString(1,scm);
ps.setString(2,sexd);
ps.setString(3,sst);
ps.setString(4,scst);
ps.setString(5,ssup);
ps.setString(6,ssnum);
ps.setString(7,sr);
ps.setString(8,scb);
ps.executeUpdate();
JOptionPane.showMessageDialog(null,"Your entry has been stored successfully!!!");
}
catch(Exception e)
{
JOptionPane.showMessageDialog(null,"Error!Try again!");
System.out.println(e);
}
}
}
public static void main(String[] args)
{
new gut();
}
}
On top of what everybody else has already said, if you REALLY want to use a single action listener, you are going to need to work out which action has actually occurred.
You could check the source of the ActionEvent (evt.getSource()) or, more appropriately, you could assign a action command to each component using the action listener.
Check out JComboBox.setActionCommand(...) and JButton.setActionCommand(...)
After that, it's a simple case of checking the ActionEvent.getActionCommand() property to determine the correct action to take.
The problem is that every time you hit the "Save" button you are retrieving the information from the database over again, so, you overwrite the TextFields and then you read from the TexFields content. Try to take out this part:
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn = DriverManager.getConnection
("jdbc:odbc:vasantham", "", "");
Statement st = conn.createStatement();
ResultSet rs = st.executeQuery("select * from try where tname='"
+ scb + "'");
SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
while (rs.next()) {
icm = rs.getString("composition");
iexd = formatter.format(rs.getDate("exdate"));
istk = Integer.toString(rs.getInt("stock"));
icst = rs.getString("cost");
isup = rs.getString("sup");
isnum = rs.getString("supnum");
ir = rs.getString("rack");
}
cm.setText(icm);
exd.setText(iexd);
stk.setText(istk);
cst.setText(icst);
sup.setText(isup);
snum.setText(isnum);
r.setText(ir);
conn.close();
} catch (Exception e) {
System.out.println(e);
}
from the action performed method.
Every time your action event is fired, you read data from DB and write it into the textfields.
You can change that text and it will be displayed correctly in your textfields. But when you click save, all your changes are overwritten with the DB values again.
So you have to separate the functionalities "read from DB" and "write changes".
edit:
oops, too slow..
Your actionPerformed() function retrieves the information from the database every time. If you press the Save button it will first retrieve the information and then save the information if the action command is "Save". This is why you always get the information that's currently in the database from getText() when pressing the Save button.
Make a different function / actionListener to execute when the Save button is pressed or take the part of the code that updates the text fields else where.
Try something like this instead:
JButton saveButton = new JButton( new AbstractAction("save") {
#Override
public void actionPerformed( ActionEvent e ) {
// Save the info here or just call a function that will.
}
});