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• How do I select the number of distinct days in a date range?

  - by isme

  I'm trying to use the T-SQL function DATEDIFF to select the number of distinct dates in a time period. The following query: SELECT DATEDIFF(DAY, '2012-01-01 01:23:45', '2012-01-02 01:23:45') selects 1, which is one less than I want. There are two distinct dates in the range: 2012-01-01 and 2012-01-02. It is not correct to add one to the result in the general case. The following query: SELECT DATEDIFF(DAY, '2012-01-01 00:00:00', '2012-01-02 00:00:00') selects 1, which is correct, because there is only one distinct date in the range. I'm sure there is a simple bit of arithmetic that I'm missing to calculate this. Can someone help me?

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• ActiveMQ - Removing queues programatically

  - by Eduardo Z.

  Fellow StackOverflowers, is there a way for me to remove a queue or a topic in ActiveMQ programatically? I am using ActiveMQ's standard persistency, and my application requires that, on startup, all new queues be dynamically re-created (unless there are messages stored in the queue, in which case, the queue should remain to exist). I am also creating all queues programatically through sessions. Is there an equivalent to that procedure, only to delete a queue? Querying and iterating through the existing queues would also be useful, but i haven't found a way to do that yet. Please help an ActiveMQ noob! =)

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• Lego-Style Cocoa Workflow Application

  - by Armin Ronacher

  Hi, I currently have to develop a system very similar to MIT's Scratch's UI. In case you don't know it, here a screenshot: http://kidconfidence.com/blogs/wp-content/uploads/2007/10/scratch1.png Basically you have bricks in the library on the left you can drop into the window on the right side. The problem I have is that I'm new to Cocoa and not sure what would be the best way to accomplish that. Because you can nest these bricks sometimes and other times stick them together I wonder if there is something that would help implementing that. I recognize this is not a very common interface that there are probably no implementations of that around, but maybe there are helpers for parts of this. Regards, Armin

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• Dns caching for sockets

  - by Poma

  I'm connecting to some websites through socks proxy server. In my case its very good to implement dns cache, so proxy don't need to resolve website's ip address. So, I performed DNS lookup, but don't know where to supply IP address. mySocket.Connect uses proxy's ip address so it isn't right place. I tried to place it in http header GET http://11.22.33.44/index.html HTTP/1.1 - this doesn't work (even in browser) since website is on virtual hosting. It seems that Host header is right place for resolved ip address. Am I right? Will proxy resolve host name (since it's still there in GET header) or not?

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• How do I check if a SQL Server 2005 TEXT column is not null or empty using LINQ To Entities?

  - by emzero

  Hi there guys I'm new to LINQ and I'm trying to check whether a TEXT column is null or empty (as String.IsNullOrEmpty). from c in ... ... select new { c.Id, HasBio = !String.IsNullOrEmpty(c.bio) } Trying to use the above query produces an SqlException: Argument data type text is invalid for argument 1 of len function. The SQL generated is similar to the following: CASE WHEN ( NOT (([Extent2].[bio] IS NULL) OR (( CAST(LEN([Extent2].[bio]) AS int)) = 0))) THEN cast(1 as bit) WHEN (([Extent2].[bio] IS NULL) OR (( CAST(LEN([Extent2].[bio]) AS int)) = 0)) THEN cast(0 as bit) END AS [C1] LEN is not applicable to TEXT columns. I know DATALENGTH should be used for them... How can I force LINQ to produce such thing? Or any other workaround to test if a text column is null or empty??? Thanks!

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• Delphi disable warnings fails

  - by Alan Clark

  I have the following code in a Delphi 2007 application: function TBaseCriteriaObject.RecursiveCount( ObjType: TBaseCriteriaObjectClass): integer; var CurObj: TBaseCriteriaObject; begin result := 0; {$WARNINGS OFF} for CurObj in RecursiveChildren(ObjType) do Inc(Result); {$WARNINGS ON} end; Which produces this warning: [DCC Warning] BaseCriteriaObject.pas(255): H2077 Value assigned to 'CurObj' never used I understand the warning but don't want to change the code, so how do I get rid of the warning because {$WARNINGS OFF} does not seem to work in this case?

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• shell script passing subset of arguments

  - by arav

  From the wrapper shell scripts i am calling the Java program. I want the Unix shell script to pass all the arguments to java program except the EMAIL argument. HOW Can i remove the EMAIL argument and pass the rest of the arguments to the java program. EMAIL argument can come at any position. valArgs() { until [ $# -eq 0 ]; do case $1 in -EMAIL) MAILFLAG=Y shift break ;; esac done } main() { valArgs "$@" $JAVA_HOME/bin/java -d64 -jar WEB-INF/lib/test.jar "$@"

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• Rails override validator message

  - by Anand

  Hi, I have a site thats served in 2 flavours, English and French. Here's some code app/views/user/register.html.erb ----------------- <% form_for .....> <%= f.text_field :first_name %> <% end %> app/models/user.rb ------------------ class User < ActiveRecord::Base validates_presence_of :first_name end Now to display the error message in case if the site is being served in the French version, I have app/config/locales/fr.yml ------------------------- activerecord: errors: messages: empty: "ne peut pas être vide" So if someone does not fill in a first name, the validator takes the name of the field and appends the custom message for empty clause giving "First name ne peut pas être vide" which is incorrect, coz 'First name' in French is 'Prénom', hence it should be "Prénom ne peut pas être vide" Please can someone suggest a way of achieving the desired result.

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• Using injected EntityManager in class hierarchies

  - by Emre Sahin

  The following code works: @Stateless @LocalBean public class MyClass { @PersistenceContext(name = "MyPU") EntityManager em; public void myBusinessMethod(MyEntity e) { em.persist(e); } } But the following hierarchy gives a TransactionRequiredException in Glassfish 3.0 (and standard JPA annotations with EclipseLink.) at the line of persist. @Stateless @LocalBean public class MyClass extends MyBaseClass { public void myBusinessMethod(MyEntity e) { super.update(e); } } public abstract class MyBaseClass { @PersistenceContext(name = "MyPU") EntityManager em; public void update(Object e) { em.persist(e); } } For my EJB's I collected common code in an abstract class for cleaner code. (update also saves who did the operation and when, all my entities implement an interface.) This problem is not fatal, I can simply copy update and sister methods to subclasses but I would like to keep all of them together in a single place. I didn't try but this may be because my base class is abstract, but I would like to learn a proper method for such a (IMHO common) use case.

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• Firefox redirect response on xhr request

  - by Bogdan Gusiev

  Suppose we have the xhr 'POST' request that returns 'redirect' status code. In that case browser is sending additional xhr 'GET' by the given URL. I am not sure who is doing that call chain: browser itself or js library(using MooTools). The problem is that the second 'GET' request is not recognized as xhr by the server: It doesn't have "X-Requested-With" header contains "XMLHttpRequest" The problem appears only on Firefox, but not on Webkit. So, believe it is not related to js library bug. Does anyone have ideas how to fix it?

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• jQuery fading in an element - not working exactly as i want it to...

  - by Nike

  Anybody see what's wrong? Doesn't seem to do anything. If i replace $(this, '.inner').stop(true, false).fadeIn(250); with $(.fadeInOnHover .inner').stop(true, false).fadeIn(250); then all the .inner elements on the page will fade in (which isn't really what i want, as i have ~10 of them). I know it's possible to achieve what i want to do, but i don't know how in this case. Thanks in advance :) <script type="text/javascript"> $(document).ready(function() { $('.fadeInOnHover .inner').css("display","none"); $('.fadeInOnHover').hover(function() { $(this, '.inner').stop(true, false).fadeIn(250); }).mouseout(function() { $(this, '.inner').stop(true, true).fadeOut(100); }); }); </script>

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• Multline Text in a WPF Button through C#

  - by Paul

  How do I get multi-line text on a WPF Button using only C#? I have seen examples of using <LineBreak/> in XAML, but my buttons are created completely programmatically in C#. The number and labels on the buttons correspond to values in the domain model, so I don't think I can use XAML to specify this. I have tried the naive approach below, but it does not work. Button b = new Button(); b.Content = "Two\nLines"; or b.Content = "Two\r\nLines"; In either case, all i see is the first line ("Two") of the text.

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• How to set width of textbox to be same as MaxLength in ASP.NET

  - by John Galt

  Is there a way I can limit the width of a textbox to be equal to the MaxLength property? In my case right now, the textbox control is placed in a table cell as in this snippet: <td class=TDSmallerBold style="width:90%"> <asp:textbox id="txtTitle" runat="server" CausesValidation="true" Text="Type a title here..be concise but descriptive. Include price." ToolTip="Describe the item with a short pithy title (most important keywords first). Include the price. The title you provide here will be the primary text found by search engines that index Zipeee content." MaxLength="60" Width="100%"> </asp:textbox> (I know I should not use HTML tables to control layout..another subject for sure) but is there a way to constrain the actual width to the max number of characters allowed in the typed box?

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• adjust selected File to FileFilter in a JFileChooser

  - by amarillion

  I'm writing a diagram editor in java. This app has the option to export to various standard image formats such as .jpg, .png etc. When the user clicks File-Export, you get a JFileChooser which has a number of FileFilters in it, for .jpg, .png etc. Now here is my question: Is there a way to have the extension of the default adjust to the selected file filter? E.g. if the document is named "lolcat" then the default option should be "lolcat.png" when the png filter is selected, and when the user selects the jpg file filter, the default should change to "lolcat.jpg" automatically. Is this possible? How can I do it? edit: Based on the answer below, I wrote some code. But it doesn't quite work yet. I've added a propertyChangeListener to the FILE_FILTER_CHANGED_PROPERTY, but it seems that within this method getSelectedFile() returns null. Here is the code. package nl.helixsoft; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import java.io.File; import java.util.ArrayList; import java.util.List; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.filechooser.FileFilter; public class JFileChooserTest { public class SimpleFileFilter extends FileFilter { private String desc; private List<String> extensions; private boolean showDirectories; /** * @param name example: "Data files" * @param glob example: "*.txt|*.csv" */ public SimpleFileFilter (String name, String globs) { extensions = new ArrayList<String>(); for (String glob : globs.split("\\|")) { if (!glob.startsWith("*.")) throw new IllegalArgumentException("expected list of globs like \"*.txt|*.csv\""); // cut off "*" // store only lower case (make comparison case insensitive) extensions.add (glob.substring(1).toLowerCase()); } desc = name + " (" + globs + ")"; } public SimpleFileFilter(String name, String globs, boolean showDirectories) { this(name, globs); this.showDirectories = showDirectories; } @Override public boolean accept(File file) { if(showDirectories && file.isDirectory()) { return true; } String fileName = file.toString().toLowerCase(); for (String extension : extensions) { if (fileName.endsWith (extension)) { return true; } } return false; } @Override public String getDescription() { return desc; } /** * @return includes '.' */ public String getFirstExtension() { return extensions.get(0); } } void export() { String documentTitle = "lolcat"; final JFileChooser jfc = new JFileChooser(); jfc.setDialogTitle("Export"); jfc.setDialogType(JFileChooser.SAVE_DIALOG); jfc.setSelectedFile(new File (documentTitle)); jfc.addChoosableFileFilter(new SimpleFileFilter("JPEG", "*.jpg")); jfc.addChoosableFileFilter(new SimpleFileFilter("PNG", "*.png")); jfc.addPropertyChangeListener(JFileChooser.FILE_FILTER_CHANGED_PROPERTY, new PropertyChangeListener() { public void propertyChange(PropertyChangeEvent arg0) { System.out.println ("Property changed"); String extold = null; String extnew = null; if (arg0.getOldValue() == null || !(arg0.getOldValue() instanceof SimpleFileFilter)) return; if (arg0.getNewValue() == null || !(arg0.getNewValue() instanceof SimpleFileFilter)) return; SimpleFileFilter oldValue = ((SimpleFileFilter)arg0.getOldValue()); SimpleFileFilter newValue = ((SimpleFileFilter)arg0.getNewValue()); extold = oldValue.getFirstExtension(); extnew = newValue.getFirstExtension(); String filename = "" + jfc.getSelectedFile(); System.out.println ("file: " + filename + " old: " + extold + ", new: " + extnew); if (filename.endsWith(extold)) { filename.replace(extold, extnew); } else { filename += extnew; } jfc.setSelectedFile(new File (filename)); } }); jfc.showDialog(frame, "export"); } JFrame frame; void run() { frame = new JFrame(); JButton btn = new JButton ("export"); frame.add (btn); btn.addActionListener (new ActionListener() { public void actionPerformed(ActionEvent ae) { export(); } }); frame.setSize (300, 300); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { JFileChooserTest x = new JFileChooserTest(); x.run(); } }); } }

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• Recommendation for serial communications in Access 2007

  - by bglenn

  I need to communicate with a bar code scanner connected over a serial port in Microsoft Access. In older versions of Access I was able to use a wrapper around MSCOMM32.ocx that no longer seems to work. I can't use wedge communication because I need to use ACK/NACK which is only supported through the RS232 interface and I need to send messages to the scanner, which is also only supported through the RS232 interface. Are there any controls in widespread use that support serial communication in Access 2007? EDIT: In case anyone comes across this, the newest version of MSCOMM32.ocx (I believe dated 3/09) still works fine as of this writing. It is older versions of MSCOMM32.ocx that do not work.

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• Active Directory List OU's

  - by Stephen Murby

  I have this code currently, string defaultNamingContext; DirectoryEntry rootDSE = new DirectoryEntry("LDAP://RootDSE"); defaultNamingContext = rootDSE.Properties["defaultNamingContext"].Value.ToString(); rootDSE = new DirectoryEntry("LDAP://" + defaultNamingContext); //DirectoryEntry domain = new DirectoryEntry((string)"LDAP://" + defaultNamingContext); DirectorySearcher ouSearch = new DirectorySearcher(rootDSE,"(objectCategory=Organizational-Unit)", null, SearchScope.Subtree); MessageBox.Show(rootDSE.Path.ToString()); try { SearchResultCollection collectedResult = ouSearch.FindAll(); foreach (SearchResult temp in collectedResult) { comboBox1.Items.Add(temp.Properties["name"][0]); DirectoryEntry ou = temp.GetDirectoryEntry(); } } When i use the debugger i can see that rootDSE.Path is infact pointing to the right place, in this case "DC=g-t-p,DC=Local" but the directory searcher doesn't find any results. Can anyone help?

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• Modifying records in my migration throws an authlogic error

  - by nfm

  I'm adding some columns to one of my database tables, and then populating those columns: def self.up add_column :contacts, :business_id, :integer add_column :contacts, :business_type, :string Contact.reset_column_information Contact.all.each do |contact| contact.update_attributes(:business_id => contact.client_id, :business_type => 'Client') end remove_column :contacts, :client_id end The line contact.update_attributes is causing the following Authlogic error: You must activate the Authlogic::Session::Base.controller with a controller object before creating objects I have no idea what is going on here - I'm not using a controller method to modify each row in the table. Nor am I creating new objects. The error doesn't occur if the contacts table is empty. I've had a google and it seems like this error can occur when you run your controller tests, and is fixed by adding before_filter :activate_authlogic to them, but this doesn't seem relevant in my case. Any ideas? I'm stumped.

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• Xpath how to select an element based on an order and dependent of its existence

  - by hokkos

  Hi, how to select an element based on an order and dependent of its existence in XPath ? For example how to select the best quality video if it exist. <VIDEOS> <LOW_RES>video_L.flv</LOW_RES> <HI_RES>video_H.flv</HI_RES> <HD/> </VIDEOS> this should return video_H.flv because the hd version doesn't exist this case can exist (the videos names can be random): <VIDEOS> <LOW_RES>video_L.flv</LOW_RES> <HI_RES>video_H.flv</HI_RES> <HD>video_hd.mp4</HD> </VIDEOS> this should return video_hd.mp4 because the hd version exist. Many thanks.

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• JavaScript distributed computing project

  - by Ben L.

  I made a website that does absolutely nothing, and I've proven to myself that people like to stay there - I've already logged 11+ hours worth of cumulative time on the page. My question is whether it would be possible (or practical) to use the website as a distributed computing site. My first impulse was to find out if there were any JavaScript distributed computing projects already active, so that I could put a piece of code on the page and be done. Unfortunately, all I could find was a big list of websites that thought it might be a cool idea. I'm thinking that I might want to start with something like integer factorization - in this case, RSA numbers. It would be easy for the server to check if an answer was correct (simply test for modulus equals zero), and also easy to implement. Is my idea feasible? Is there already a project out there that I can use?

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• How can I call model methods or properties from Django Admin?

  - by kg

  Is there a natural way to display model methods or properties in the Django admin site? In my case I have base statistics for a character that are part of the model, but other things such as status effects which affect the total calculation for that statistic: class Character(models.Model): base_dexterity = models.IntegerField(default=0) @property def dexterity(stat_name): total = self.base_dexterity total += sum(s.dexterity for s in self.status.all()]) return total It would be nice if I could display the total calculated statistic alongside the field to change the base statistic in the Change Character admin page, but it is not clear to me how to incorporate that information into the page.

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• Storing Templates and Object-Oriented vs Relational Databases

  - by syrion

  I'm designing some custom blog software, and have run into a conundrum regarding database design. The software requires that there be multiple content types, each of which will require different entry forms and presentation templates. My initial instinct is to create these content types as objects, then serialize them and store them in the database as JSON or YAML, with the entry forms and templates as simple strings attached to the "contentTypes" table. This seems cumbersome, however. Are there established best practices for dealing with this design? Is this a use case where I should consider an object database? If I should be using an object database, which should I consider? I am currently working in Python and would prefer a capable Python library, but can move to Java if need be.

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• How do I force SSL for some URLs and force non-SSL for all others?

  - by brad

  I'd like to ensure that certain URLs on my site are always accessed via HTTPS while all other URLs are accessed via HTTP. I can get either case working in my .htaccess file, however if I enable both, then I get infinite redirects. My .htaccess file is: <IfModule mod_expires.c> # turn off the module for this directory ExpiresActive off </IfModule> Options +FollowSymLinks AddHandler application/x-httpd-php .csv RewriteEngine On RewriteRule ^/?registration(.*)$ /register$1 [R=301,L] # Force SSL for certain URL's RewriteCond %{HTTPS} off RewriteCond %{REQUEST_URI} (login|register|account) RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L] # Force non-SSL for certain URL's RewriteCond %{HTTPS} on RewriteCond %{REQUEST_URI} !(login|register|account) RewriteRule ^(.*)$ http://%{HTTP_HOST}%{REQUEST_URI} [R=301,L] # Force files ending in X to use same protocol as initial request RewriteRule \.(gif|jpg|jpeg|jpe|png|ico|css|js)$ - [S=1] # Use index.php as the controller RewriteCond %{REQUEST_URI} !\.(exe|css|js|jpe?g|gif|png|pdf|doc|txt|rtf|xls|swf|htc|ico)$ [NC] RewriteCond %{REQUEST_URI} !^(/js.*)$ RewriteRule ^(.*)$ index.php [NC,L]

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• Daylight saving time of current tz

  - by spam2

  Hi, in my c++ software I've used Boost in some parts and also for the local time. OK, now my problem is to make a check if in my machine is active or not the DST. With the follow part of code I can know only the difference from the UTC time. In my case the difference is 2 hours because is active the DST ptime tLoc = second_clock::local_time(); ptime tUTC = second_clock::universal_time(); time_duration tDiff = tUTC - tLoc; local_time_zone = tDiff.hours(); I think that the boolean funcion has_dst() can help, right? My system is Debian GNU/Linux. Thanks

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• mod_rewrite regex help

  - by Bathan

  HI guys. Im using mod_rewrite to do some redirects on a web site. I want to be able to do the following mySite.com/ - Goto Home mySite.com/foo - Goto redirect.php and redirect acordingly. My redirect rule was RewriteRule (^\w*$) redirect.php?url=$1 [NC] But im oviously missing something because when I go tomySite.com/ I get sent to redirect.php I need a regex that allow lower and upper case letters, as well as underscores but it has to ignore "empty" strings so when I go to mySite.com/ the index file is displayed. Any help? Thanks!

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• Design Patterns: What's the antithesis of Front Controller?

  - by Brian Lacy

  I'm familiar with the Front Controller pattern, in which all events/requests are processed through a single centralized controller. But what would you call it when you wish to keep the various parts of an application separate at the presentation layer as well? My first thought was "Facade" but it turns out that's something entirely different. In my particular case, I'm converting an application from a sprawling procedural mess to a clean MVC architecture, but it's a long-term process -- we need to keep things separated as much as possible to facilitate a slow integration with the rest of the system. Our application is web-based, built in PHP, so for instance, we have an "index.php" and an IndexController, a "account.php" and an AccountController, a "dashboard.php" and DashboardController, and so on.

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