I am facing a problem with JTable when inserting JTable values into the database. For example I have three columns, and user enters the corresponding data into three columns, JTable has several rows and I have one submit button at bottom of the table. After filling the data into all the rows, when the user press the submit button, the data is inserted into the database. This works fine without any problems.
Now consider user enters only 10 rows and he didn't click the submit button, because of some power failure the system shutdown suddenly. Now I want to store these 10 rows in a collection and when the application is started again I want to insert these 10 rows values automatically into the database. Please consider that user information is very critical information. I don't know how to do this.
Rightly said by #madprogrammer you have to take help of temp tables,
just add a action listener to ***jtable***after insertion of row data it will transfer your data into temp tables.
-- after click on submit button, there should be check that if data is present in temp tables, first insert these data into main table.and truncate or delete data from temp tables.
here collection will not work for you.
Hope it may help you.
Related
Well I have a JTable in my app that fetches records from a MySql database adn displays them in a sorted order.
Till now I have been using a separate JTextArea and a JComboBox to allow the users to edit the table, something like
so whenever someone clicks on a row in the table the ID of the record is automatically updated below in a JLabel that lies before the JComboBox.
The question is how can I allow users to simply double click and edit values in the cells which would automatically fire a SQL Update query and update the same in the database. I want to allow this on certain Columns only not every Column.
A response with a code example would be highly appreciated.
how can I allow users to simply double click and edit values in the cells which would automatically fire a SQL Update query and update the same in the database.
You can use a TableModelListener to be notified of changes to the TableModel.
I want to allow this on certain Columns only not every Column.
The row/column is found in the TableModelEvent so you check the column that changed before invoking the SQL update.
One potential problem with this is that a TableModelEvent is generated even if the data isn't changed. That is if you place the cell in edit mode and, for instance, tab to the next cell without change the data and event will still be generated.
To get around this problem you may want to consider using the Table Cell Listener. When using this class the event is only generated if the data has actually been changed.
I just got this Jtable on Netbeans . First I want it to auto-calculate some grades, as you can see it has 3 columns (1st, 2nd and 3rd evaluation). I have to type between 0 and 100, in each row.
In the end, get the total and average. This can be displayed in a Jlabel, or a textfield. But, it has to be displayed real-time (as I'm typing the values).
Also, I can't type data on all the cells, just one for each row. How do I do this?
I know I can change the columns to accept only Integer values, but for everything else, I have no idea how to proceed.
In the end, get the total and average. This can be displayed in a Jlabel, or a textfield. But, it has to be displayed real-time (as I'm typing the values).
Well, you would want to update "after" the user has finished editing a cell and saves the value to the table.
So you can use a TableModelListener. You add the TableModelListener to the TableModel. Then when the data is saved an event will be generated and you can recalculate the values and update the label.
Check out the following for a simple example to get your started: TableModelListener and multiple column validation. Your logic in the listener will change based on your exact requirement.
You can do this by attaching a defaultTableModel to your JTable. After attaching TableModel to your JTable. You can use command JTable.addRow(Object[]) to add rows to table.
I'm working on a project in NetBeans.
I have a Jtable which i bound to my database and there is a form that I use to insert data.
I want the records in the table to be refreshed with each insert.
How can I do that?
I want the records in the table to be refreshed with each insert.
Then your "insert" logic need to do two things:
insert the data into the database
insert the data into the JTable. This is done by using the addRow(...) method of the DefaultTableModel. You get the data from the form, create a Vector to contain the data for each column then you add the Vector to the model.
I should simply select the table and go to the navigator window. Under "Other Components" there is the list that was created after the binding and contains the table records (you should know its name). Right click on the list > Properties > check "observable".
Please try the following code:
if you want update the table on button click or on event of any component
you have to put the code in the event
the list generated should be Observable checked
code
udetailsList.clear();
udetailsList.addAll(udetailsQuery.getResultList());
Hello i have this Abstract Table which im making a video hiring application with. I want the user to be able to sort through the table with buttons I have supplied. In the buttons I have a "Show only overDue videos" so when the user hits this button in my action listener i want to be able to hide the rows not delete them so when the user clicks another button they will re-appear any ideas on how i would go about doing this?
Use the filtering support provided by JTable.
Read the section from the Swing tutorial on Sorting and Filtering for more information and examples.
1) Maintain a master Data list. Intially the table model data will reflect the Master data.
2) When the user "press show only over due vidoes", iterate the master data and filter only the required elements and clear the table model and add only the filtered data to the table model and fire table model changed.
I need to develop an jsp application where I need to bring data from database table and display it in table in frontend dynamically. I need to make this table editable. The user can edit any number of rows which all should be updated in the database table automatically on clicking Save Changes button.
I am able to bring data from database table and display it. I am displaying the values obtained from table in each cell of input type text of form. We am i clicking edit button i am able to update only last edited row in the table.
Please tell how to update all the edited rows at a time.
Provide two links for view and edit
of table values
In view keep the values simply in td element of table.
In edit , use input elements of type text inside td element.
If you want to do everything in same page, Ajax can be used for both view and edit.