JTextField.setDocument(null) in 1.3 and 1.4

Hi
We are upgrading to Java 1.4 from 1.3. The method JTextField.setDocument(doc) works fine in 1.3 when 'doc' is null. But in 1.4, it throws null pointer exception. I am not using JTextField directly, I am using a derived class of JTextField. 'doc' is a class var that implements interface Document.
Can anybody tell how to solve this problem in 1.4?
Thanks

Well, a Document is used to store the text entered into the JTextField. If the Document is null then you can't store any text. If you can't store any text then you don't need the JTextField. If you don't need the JTextField, remove it from the screen.
Of course a simpler solution would be to not set the Document to null. Why do you set it do null?

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How to transfer database table contain null values, primary key, and foreign key to the another database in same server. using INSERT method.

how to transfer database table contain null values, primary key, and foreign key to the another database in same server. using INSERT method. thanks

INSERT targetdb.dbo.tbl (col1, col2, col3, ...)
SELECT col1, col2, col3, ...
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Or what is your question really about? Since you talke about foreign keys etc, I suspect that you want to transfer the entire table definition, but you cannot do that with an INSERT statement.
Erland Sommarskog, SQL Server MVP, [email protected]

Slight Issue with JTextField Returning Null

Hey everyone,
I just have a slight problem involving a null value returned when I call the getText method of a textField, even when there is text in the field.
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public static void createGUI()
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Null value for int and datetime date type in xml schema

hi:
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</xs:element>
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Visakh16 I cant agree more with you on it, it is good but in production u cant have them change maxrows. I think
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Hmm..Why do you need to change it in production?
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just to make sure it interprets the datatype correctly at design time and has nothing to do with production deployment
Please Mark This As Answer if it solved your issue
Please Mark This As Helpful if it helps to solve your issue
Visakh
My MSDN Page
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XML Schema -- xsi:null in document instance and nullable in XSD

Hi,
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<DOC>
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Hi, Thanks for the reply.I have a scenario like this :
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Thanks

Null value of fax and Null value of email is not reflecting in SRM

Hi
If you change the Vendor fax and email to null value in SAP(transaction XK02 in communication for address) and replicate the vendor in SRM 5.0 with transaction BBPUPDVD, still in manage business partners BBPMAININT as vendor I am able to see old fax number and email id instead of null value in Contact for Business Partner area.
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Regards
Dayal

solved!

Exclude NULL values from SUM and AVG calculation

Hi,
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Can someone please help ?
Thanks and Regards,
Oliver D'mello

Hi Oliver,
According to your description, you want to ignore the NULL values when you perform aggregation functions.
In this scenario, aggregate functions always ignore the NULL values, because their operation objects are non-null values. So I would like to know if you have assigned “0” for NULL values. I would appreciate it if you could provide some screenshots about
your expressions or reports.
Besides, we have tested in our environment using Min() function. The expression returns the minimum value among the non-null numeric values. Please refer to the screenshots below:
Reference:
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Best regards,
Qiuyun Yu

Table joins, templates, null-checks, layer confusion and localization

Hello everyone, this is my first post on this network.
I am designing a website that does several things, one of which is to display latest news items on the home page.
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<hr />
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I hope I was able to explain my problem properly and I thank anyone in advance for taking the time to read and give their insight on such a problem. Thank you :)

antirealm wrote:
Hello everyone, this is my first post on this network.
I am designing a website that does several things, one of which is to display latest news items on the home page.
The news items are stored in the database as a table with a basic structure: id, poster_id, postDate, subject, body
where id is the primary key, poster_id is a foreign key to the users table, postDate is the date at which posted and the rest is obvious.
I want to display these items with a basic template:
subject by author at postDate
body
<hr />
When a user changes his/her username, the updated username will be shown on the news listing. This is the reason why I'm using a foreign key.
I've defined poster_id such that it can be set as NULL, meaning it was not created by a registered user, but a guest. Don't ask me why I'd want a guest to post a news item :PI think this is a fundamental mistake. A better design, IMO, would be to have an explicit GUEST or anonymous poster ID, but not null.
When it comes to getting the news posts from the database and resolving the poster_id to a username i just use a join. However, when poster_id is NULL i obviously don't get a username for that post but a NULL. The word "Guest" has to come in when the poster_id is null. So in my template you'd think i could just put a null check as I can't do it in sql (as far as i know anyway).See above.
Now, I'm using localization on the site and the word "Guest" is different depending on the locale. So you'd think i could just use a null check and a locale->get('guest_username') and that will return the word "Guest" in the right language.Localization should be a UI issue. It should be all sorted out by the time you get to the persistence layer.
If I want to view news on different pages, and more importantly, in different forms such as just author: subject, I come across a problem. I want to avoid having to repeat that null check code on every template that views news posts. Complicating things, I want anywhere that display a username to do the null check and return the locale'd guest username if it is a null.If it's hard to do, it's worth re-thinking. Don't use null when there are sensible non-null alternatives.
Where do I put this null check? The locale object is part of the model layer, because other model objects use it.
Is this the presentation or the model layer's responsibility? I am relatively new to this design patterns thing, but I'm getting there :) I've thought about using wrapping classes but I'm just not sure at this point and I need smart people's opinion :)L10N and I18N issues should be the responsibility of the presentation layer, IMO.
%

Recovery of VHD file from tape immediately gives null error, ID 1001, and job fails.

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Hi,
Can you provide DPM version and update rollup version. Are there any events from MSDPM after the error, if so, can you supply the event details ?
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Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT]
This posting is provided "AS IS" with no warranties, and confers no rights.

The save button has a null sign through it and we cannot save the project

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Reading values from JTextField and using them?

Hello,
I am trying to make a login screen to connect to an oracle database. Im pretty new to creaing GUI. I need help with reading the values from the JTextField and to be able to use them for my connection. So do I need to apply a listener? How do I go about doing that in this project. Thanks for any code or advice.
import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.sql.*;
public class UserDialog
    String databaseURL;
    String driver;
    String database;
    String username;
    String password;
    String hostname;
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     JTextField usernameField = new JTextField("");
        JLabel     passwordLabel = new JLabel("Password:   ", JLabel.LEFT);
     JTextField passwordField = new JPasswordField("");
        JLabel     hostnameLabel = new JLabel("Host Name:   ", JLabel.LEFT);
     JTextField hostnameField = new JTextField("");
        JLabel     portLabel = new JLabel("Port:   ", JLabel.LEFT);
     JTextField portField = new JTextField("");
     connectionPanel = new JPanel(false);
     connectionPanel.setLayout(new BoxLayout(connectionPanel,
                              BoxLayout.X_AXIS));
     JPanel namePanel = new JPanel(false);
     namePanel.setLayout(new GridLayout(0, 1));
     namePanel.add(databaseURLLabel);
     namePanel.add(driverLabel);
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        namePanel.add(portLabel);
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               DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
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            con.close();
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James

the reason why you can't get the text is because you are reading the value before some actually inserts anything in any fields.
Here is what you need to do:
Create a JDialog/JFrame. Create a JPanel and set that panel as contentPane (dialog.setContentPane(panel)). Insert all the components, ie JLabels and JTextFields. Add two buttons, Login and Cancel to the panel as well. Now get the username and password field values using getText() inside the ActionListener of the Login.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class LoginDialog extends JDialog
String username, password;
public LoginDialog( ){
    setTitle( "Login" );
    JPanel content = new JPanel(new GridLayout(0, 2) ); // as many rows, but only 2 columns.
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    content.add( new JLabel( "Password" ) );
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    pack( ); // pack everything in the dialog for display.
    show(); // show the dialog.

IS NULL and LIKE '%'

How can
select * from training_participant_tab where participant_id = '9020' and
company_id IS NULL; returns 5 records and
select * from training_participant_tab where participant_id = '9020' and
company_id LIKE '%'; returns NOTHING ?
field company_id is varchar2 field..

NULL is very much not the same as ''.
INSERT INTO training_participant_tab (participant_id, company_id) values
(9020,'') is not the same as INSERT INTO training_participant_tab
(participant_id) values (9020)Not right. Oracle treats '' as NULL value:
SQL> create table t (participant_id number, company_id varchar2(10));
Table created.
SQL> insert into t values (9200,'');
1 row created.
SQL> insert into t (participant_id) values(9200);
1 row created.
SQL> select * from t where company_id is null;
PARTICIPANT_ID COMPANY_ID
9200
9200Rgds.

Code returns "null" and "0"s in main module - why?

I am coding a program that is in two modules. The main module serves it's standard function. The inventory class/module has three functions - 1) request stock input on 4 data points (1 String and 3 integers, one of which is a double) - 2) calculate the value of the inventory, and - 3) return string which reads out the 4 data points and the calculation showing the total value of the inventory. I've created the 3 functions in the inventory class/module, but obviously don't have them referring to each other correctly because when we come to the end of the program the output is null for the String and "0"s for the int/doubles. The code is below - any ideas about how to overcome the empty output? The code compiles fine and acts like it is going to work, but when it comes to the final command line it outputs
"null, which is item number 0, has 0 currently in stock at a price of 0.00 each. The total value of inventory in stock is 0.00"
Main module:
public class Main {
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}// end method

justStartingOut wrote:
Actually my final solution was quite simple - I moved the calculation and final formated print text statements into the body of Inventory's class code. It now works. "Works" scares me a bit.
Someone cooking dinner might rummage about in the fridge and the cupboards to see what's there. Do imaginative things with what they come up with. And, with a bit of luck come up with something tasty or, at any rate edible.
A physician deciding on a medical treatment would do well to try a more cautious approach. A specific aim would be a good thing. And a calculated appreciation of the documented effects of each medicine. And how they interact.
It's up to you to determine which approach your coding should resemble. But it seems to me that your original Main class had a perfectly good reason to exist. It was a driver class whose purpose seemed to be to create and use an Inventory. (And using an Inventory is a very different thing from being an Inventory, so it made perfect sense to have two different classes.) To me it works or not, depending on whether it fufills that purpose. And what you have done is not so much solve the problem of it not working, as avoid that problem.
(If by "moved" you mean that the outputting now occurs as part of - or is called from - inventoryInput() then that is not a good thing. The input method should input: just input.)
I think that is because once the original input was loaded into the program (when I entered product number, name, price and value), the entries were dropped when the code switched to the next step. I think your intuition is entirely correct. In particular look at what your original main() method does (my comments replacing yours):
Inventory inventory = new Inventory(); // (A) Create an inventory...
inventory.inventoryInput(); // ... and put stuff into it
    // (B) Create some new entirely different (and empty) inventory...
Inventory results = new Inventory();
results.inventoryResults(); // ... and print its contentsInstead of creating a second inventory, try printing the results of the first one.
Edited by: pbrockway2 on Apr 22, 2008 12:37 PM
Whoops ... just read reply 2.
It might sense, though to call totalValue() at the end your input method (because at that point the total value has changed). Or do away with that method - which you worked on getting right in your other thread ;)

Distinguishing between empty string and null values

hi all,
I am using an ODBC connection to connect my java app to database using JDBCODBC driver. I have 2 columns 'aColumn' and 'bColumn' in my table, both allow null values. I have one row in it, which has null value in aColumn and empty string in bColumn. I retrieve this row's data and assign it to 2 columns : 'aColumnVar' and 'bColumnVar' respectively. I find out that both 'aColumnVar' and 'bColumnVar' variables has null values (although bColumnVar should has an empty string as its value). Now my ODBC connection Data Source has the option "Use ANSI nulls, paddings, and warnings" ON. I turn it off and try again. This time both 'aColumnVar' and 'bColumnVar' variables has empty string as values (although aColumnVar should has null as its value).
How can I make sure that i can get the data exactly as it is in the database in my variables?
Thanks

there is a wasNull() method on ResultSet. After you
have obtained the value of a column e.g. by calling a
method like getString you can call wasNull and if it
returns true then the value on the database is null.
Check the java docs, it might explain it better
http://java.sun.com/j2se/1.4.1/docs/api/java/sql/Result
et.html#wasNull()I am using MS SQL Server 7.0 under Windows NT 4.0 with JDK 1.2. My ODBC connection Data Source has to have the option "Use ANSI nulls, paddings, and warnings" ON.
I try the wasNull() method but it is doing the same thing i.e. telling me that a column is null when in database it is null (right); and a column is null when in database it is an empty string (wrong). I suspect it is something to do with the JDBC-ODBC driver I am using.

Hiding Entire Row having Null and default valu in SSRS Using Expression

Hi,
In my reports having number of rows and three columns.The first columns value will be different for each and every row and it will be hard corded to the text box. My question is how to hide the particular row second and third column suppose
to be null or empty data and each and every row had Hide is true.Please provide me the solution if anybody known.
Regards,
HariKan
HariKan

Hi Qiuyun Yn,
Thanks for your reply.
If i use Not Null in my query in where
condition then i have to add 30 fields in my where condition, and i guess it will not give proper output why because i have 30 columns.
So could you please give me in report level solution. I am struggling past 10 days for this issue.
Regards,
Hari
HariKan

JTextField.setDocument(null) in 1.3 and 1.4

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