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• Structure of a correctly implemented JTable with TableModel and Listeners?

  - by bamboocha

  I am pretty new to Java and its JTables and this is where I am struggling at the moment. I need to create a GUI which shows me results of a sql query like SELECT * FROM tblPeople WHERE name='Doe'. My idea was to create a a JFrame which displays a JTable with all found records. Besides this, I need to also implement some code to handle when a user is double clicking a record or selecting it by using his arrow keys (additional feature: pressing 12(e.g.) should select the 12th record). What is the best way to structure my program (what classes do I need and especially where do I store my logic)? I came up with structuring it the following way: Main.java ("view") SQLConnection.java PeopleTableModel.java (only stores and returns data given by the passed ResultSet, "model" inherits from DefaultTableModel) PeopleTable.java (stores basically all my logic including KeyListener and MouseListener, "controller", inherits from JTable) Are there better ways to achieve my goals? If so, what are they?

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• Server for online browser game

  - by Tim Rogers

  I am going to be making an online single player browser game. The online element is needed so that a player can login and store the state of their game. This will include things like what buildings have been made and where they have been positioned as well as the users personal statistics and achievements. At this point in time, I am expecting all of the game logic to be performed client side So far, I am thinking I will use flash for creating the client side of the game. I am also creating a MySQL database to store all the users information. My question is how do I connect the two. Presumably I will need some sort of server application which will listen for incoming requests from any clients, perform the SQL query and then return the data. Does anyone have any recommendations of what technology/language to use?

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• Discussion of a Distributed Data Storage implementation

  - by fegol

  I want to implement a distributed data storage using a client/server architecture. Each data item will be stored persistently in disk in one of several remote servers. The client uses a library to update and query the data, shielding the client from its actual location. This should allow a client to associate keys (String) to values(byte[]), much as a Map does. The system must ensure that the amount of data stored in each server is approximately the same. The set of servers is known beforehand by other servers and clients. Both the client and the server will be written in Java, using sockets, threads, and files. I open this topic with the objective of discussing the best way to implement this idea, assuming simplicity, what are the issues of this implementation, performance measurements and discussion of the limitations.

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• Code to update HyperV Export file

  - by Andy Schneider

  I am using the HyperV Module from Codeplex to do a "config only" export from a 2008R2 Hyper-V server. In order to import the configuration on another HyperV server, I need to edit the value of CopyVMStorage in the EXP file. This file is an XML file. I wrote the following code in PowerShell to do the update for me. The variable $existing is the existing exp file. $xml = [xml](get-content $existing) $xpath = '//PROPERTY[@NAME ="CopyVmStorage"]' foreach ($node in $xml.SelectNodes($xpath)) {$node.Value = 'TRUE'} $xml.Save($existing) This code makes the correct changes to the XML. However, when I go to import the file on the Hyper-V server, I get an error that says the file format is incorrect. I am wondering if the encoding of the file is incorrect or if there is something else going on. If I edit the file manually in wordpad, it imports without an issue. The filename is a GUID with a .exp extension, and it appears that the file name is too long for notepad to open. Notepad throws an error trying to open the file, which is why I went with WordPad. I have noticed that the file that is updated with PowerShell comes out formatted whereas the raw file is xml all bunched together with no whitespace. Any ideas on what "file format" means in this HyperV error message and how I might be able to use my code to automate this change in the XML without changing the file format?

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• Permanently deleting files on Mac OS

  - by Jonik

  A while back, as relatively new Mac OS X user, I was surprised to learn that you cannot easily delete files. Directly, that is, without moving them to the trash first. On Windows and Linux this can obviously be done with ease, but not so on the Mac. I noticed this when trying clear up files from a USB memory stick — removing the files ("move to trash") does not free up space; that happens only after emptying the whole system-wide Trash. Not particularly convenient! (It seems stupid to have to empty the whole trashcan just to make some space on the USB stick. There might be gigabytes of stuff in there, and this sort of defeats its purpose - what if you'd actually need to restore something from the trash some day.) So, what's your way of getting around this? Have you bought a 3rd party application like RAW Trash for $16.95 just to delete files, or do you diligently empty the trashcan whenever needed? Or did I miss something? Also, can you convince me that this is actually the way it should be — that users shouldn't be able to fiddle with the filesystem easily? :)

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• Looking for a modern payment processor which accepts adult sites

  - by JakeRow123

  I love how easy authorize.net is to use, but they don't accept adult sites. I am lanching an adult site soon but I can't find any good credit card processors I can use. Most sites use CCbill or Epoch but they are both terrible since the customer is redirected to their external site which also has an ancient 1990's look. It's not like authorize.net's API that you can query and get the result back as to whether the payment went through or not. This makes authorize.net blend seamlessly with the product. But since adult sites are against their TOS and also paypals, what is a good alternative? I am looking for one that won't redirect the user from my site, is big enough to be reliable and trustworthy and has fairly low rates. Any help is appreciated!

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• Cannot write samba shares

  - by Batsu

  Running samba 3.5 on Red Hat Enterprise 6.1 I'm having issues sharing two folders. Here is the output of testparm: [global] workgroup = DOMAINNAME server string = Samba Server Version %v interfaces = lo, eth1 bind interfaces only = Yes map to guest = Bad User log file = /var/log/samba/log.%m max log size = 50 idmap uid = 16777216-33554431 idmap gid = 16777216-33554431 hosts allow = 10.50.183.48, 10.50.184.41, 10.50.184.199, 10.50.183.160, 127.0.0.1 hosts deny = 0.0.0.0/0 cups options = raw [test] comment = test folder path = /usr/local/samba valid users = claudio write list = claudio force user = claudio read only = No create mask = 0775 directory mask = 0775 [test2] comment = another test path = /home/claudio/tst valid users = claudio write list = claudio force user = claudio read only = No create mask = 0775 From the Windows XP machine I'm connecting from I'm able to read test but not write, while for test2 I can't even access the folder (though I can see it listed). ls -l /usr/local ... drwxrwxrwx. 2 claudio claudio 4096 Dec 3 10:39 samba ... ls -l /user/local/samba total 32 -rwxrwxrwx. 1 claudio claudio 9 Nov 29 16:26 asd.txt -rwxrwxrwx. 1 claudio claudio 728 Dec 3 10:16 out.txt ... ls -l /home/claudio/ ... drwxrwxr-x. 2 claudio claudio 4096 Dec 3 09:57 tst ... ls -l /home/claudio/tst total 4 -rw-rw-r--. 1 claudio claudio 4 Dec 3 09:57 asd.txt Any suggestion?

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• When to reply 400 Bad Request

  - by KajMagnus

  According to www.w3.org, a Web server should reply with status code 400 Bad Request if: "The request could not be understood by the server due to malformed syntax. The client SHOULD NOT repeat the request without modifications" Does that mean only request that violates some HTTP spec? Or does it include a request that my particular Web app thinks is broken? When would you reply 400? For example, if my Web app expects a query string to always include a "function=..." parameter, would you reply code 400 Bad Request or 403 Forbidden? (403 means that "The server understood the request, but is refusing to fulfill it.")

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• Concurrency checking with Last Change Time

  - by Lijo

  I have a following three tables Email (emailNumber, Address) Recipients (reportNumber, emailNumber, lastChangeTime) Report (reportNumber, reportName) I have a C# application that uses inline queries for data selection. I have a select query that selects all reports and their Recipients. Recipients are selected as comma separacted string. During updating, I need to check concurrency. Currently I am using MAX(lastChangeTime) for each reportNumber. This is selected as maxTime. Before update, it checks that the lastChangeTime <= maxTime. --//It works fine One of my co-developers asked why not use GETDATE() as “maxTime” rather than using a MAX operation. That is also working. Here what we are checking is the records are not updated after the record selection time. Is there any pitfalls in using GETDATE() for this purpose?

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• ORM Release History : Q1 2010 SP 1 (v2010.01.0527)

  Enhancements Full support for Visual Studio 2010 - the visual designer is now working in Visual Studio 2010 Ria Provider beta - supports all basic operations (query, insert, update, delete) New Enhancer - The enhancer has been replaced by a new implementation based on mono cecil. This fixes all known enhancer bugs and speeds up the enhancing process as well. Data Services Wizard integration - The Data Services Wizard is now integrated into the OpenAccess product. You can start it by using the...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Could someone help me understand SQL TDE Database encryption?

  - by SLC

  I don't quite follow how it works. According to the MSDN Article there is a big hierarchy of keys protecting other keys and passwords. At some point the database is encrypted. You query the database which is encrypted, and it works seamlessly. If you're able to simply connect to the database as normal and not have to worry about any of the encryption from a developer point of view, how exactly is it secure? Surely anyone can simply connect and do select * from x and the data is revealed. Sorry my question is a bit scattered, I am just very confused by the article.

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• Best practices for thin-provisioning Linux servers (on VMware)

  - by nbr

  I have a setup of about 20 Linux machines, each with about 30-150 gigabytes of customer data. Probably the size of data will grow significantly faster on some machines than others. These are virtual machines on a VMware vSphere cluster. The disk images are stored on a SAN system. I'm trying to find a solution that would use disk space sparingly, while still allowing for easy growing of individual machines. In theory, I would just create big disks for each machine and use thin provisioning. Each disk would grow as needed. However, it seems that a 500 GB ext3 filesystem with only 50 GB of data and quite a low number of writes still easily grows the disk image to eg. 250 GB over time. Or maybe I'm doing something wrong here? (I was surprised how little I found on the subject with Google. BTW, there's even no thin-provisioning tag on serverfault.com.) Currently I'm planning to create big, thin-provisioned disks - but with a small LVM volume on them. For example: a 100 GB volume on a 500 GB disk. That way I could more easily grow the LVM volume and the filesystem size as needed, even online. Now for the actual question: Are there better ways to do this? (that is, to grow data size as needed without downtime.) Possible solutions include: Using a thin-provisioning friendly filesystem that tries to occupy the same spots over and over again, thus not growing the image size. Finding an easy method of reclaiming free space on the partition (re-thinning?) Something else? A bonus question: If I go with my current plan, would you recommend creating partitions on the disks (pvcreate /dev/sdX1 vs pvcreate /dev/sdX)? I think it's against conventions to use raw disks without partitions, but it would make it a bit easier to grow the disks, if that is ever needed. This is all just a matter of taste, right?

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• KVM and libvirt: How to configure a new disc device to an existing VM?

  - by initall

  I've got an Ubuntu 9.04 server running two VM's. In /etc/libvirt/qemu/machine1.xml two disk devices are defined like this: <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <source file='/vserver/machine1/disk0.qcow2'/> <target dev='hda' bus='ide'/> </disk> <disk type='file' device='disk'> <source file='/vserver/machine1/disk1.qcow2'/> <target dev='hdb' bus='ide'/> </disk> I need more storage space in at least one of the devices and thought about adding a third hdc device by simply adding one with same style as above and re-organising my mount structure (The virtual sizes of the current qcow2 files are unfortunately limited.) My problem is that reloading libvirtd and restarting the VM do not result in a new visible device (checked with fdisk). I'm aware of extending an existing qcow2 file (converting to raw format, cat-ing/adding the new one, using smth. like gparted) - but only as a last resort. Hopefully it's something very simple I'm missing?

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• Why does my PC successfully boot only when unplugged for more than a few minutes?

  - by philg

  I have an HP Pavilion Elite desktop computer, model HPE-490t. I like it because it didn’t cost too much, boots itself from an SSD, came with 16 GB of RAM, and has 6 CPU cores for editing video and camera RAW images. It has one behavioral quirk that I cannot explain, however. The recent power interruptions here in the Northeast got the machine into a state where it could not be restarted. It would power up for a second or two, shut down, and then power up again, never being able to get to the point of showing anything on the monitor. I unplugged it for about 10 seconds and plugged it back in. Same behavior (fails to boot). I unplugged it and walked away for an hour, then plugged it back in and it worked perfectly! I think something similar happened after installing a second hard disk drive into this machine. So the question is why does the computer behave differently depending on how long it has been unplugged? Where is energy stored that affects the machine’s ability to boot? Capacitors in the power supply? Battery on the motherboard (there is one for the clock, but that wouldn’t be exhausted by being unplugged for an hour, I don’t think)?

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• SQL Strings vs. Conditional SQL Statements

  - by Yatrix

  Is there an advantage to piecemealing sql strings together vs conditional sql statements in SQL Server itself? I have only about 10 months of SQL experience, so I could be speaking out of pure ignorance here. Where I work, I see people building entire queries in strings and concatenating strings together depending on conditions. For example: Set @sql = 'Select column1, column2 from Table 1 ' If SomeCondtion @sql = @sql + 'where column3 = ' + @param1 else @sql = @sql + 'where column4 = ' + @param2 That's a real simple example, but what I'm seeing here is multiple joins and huge queries built from strings and then executed. Some of them even write out what's basically a function to execute, including Declare statements, variables, etc. Is there an advantage to doing it this way when you could do it with just conditions in the sql itself? To me, it seems a lot harder to debug, change and even write vs adding cases, if-elses or additional where parameters to branch the query.

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• when google search gives incorrect results - how can it be reported?

  - by vgv8

  If google search query results are incorrect: How can it be reported? What is the procedure to correct it? @Lèse majesté: Incorrect results are the results that do not contain any of the searched keywords in them like in this my question @John Conde, yes I believe it is the right defitition. @DisgruntedGoat, even when there are a lot of results by keycaptcha for "Past 24 hours", the Google.com presents results only on reCAPTCHA. Anyway, they are different from those by google if to search by "keycaptcha" (in quotes) and by other search engines. Everybody thinks that searches by one keyword should be sneakily substituted by google's own promoted brand products?

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• Doubt regarding search engine/plugin(One present on the website itself)

  - by Ravi Gupta

  I am new to web development and trying to study various types of websites as case study. Right now my focus is on how search engines works for an eCommerce website. I know basic functioning for a search engine, i.e. crawl web pages, index them and the display the results using those indexes. But I got little confuse in case of an eCommerce website. Don't you think that it would be better if a search engine instead of crawling the web pages containing products, it should directly crawl the database and index the products stored in the database? And when a user search for any product, it will simply give us the rows of the table which matches the user query? If this is not the case, can someone please explain how the usual method works on eCommerce website?

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• Optimizing data downloaded via 'link' media queries and asynchronous loading

  - by adam-asdf

  I have a website that tries to make sensible use of media queries and avoid 'expensive' CSS for users of mobile devices. My eventual goal is to make it 'mobile-first' but for now, since it is based on Twitter Bootstrap it isn't. I included some background images (Base64 encoded) and styles that would only apply to "full-size" browsers in a separate stylesheet loaded asynchronously via modernizr.load. In Firefox (but not webkit browsers) it makes it so that if you navigate away from the homepage and then return, the content (specifically, all those extras) 'blinks' when it finishes loading...or maybe I should say reloading. If, instead of using modernizr.load, I include that stylesheet via a link... in the head with a media query attribute will it prevent the data from being downloaded by non-matching browsers (mobile, based on screensize) that it is inapplicable to?

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• Identify my terminal session that started a particular process

  - by Sam

  I'm using Gnome on Ubuntu. I often have 8-20 terminal sessions open and in some of them I have su'd to a different user. The specific problem that caused me to write this query happens when using git status, but this is more general issue. git status will tell me I have an uncontrolled file .foo.java.swp. This means that in one of my terminal sessions I have vi open on foo.java. I need a script or tool that would tell me in which terminal session that vi is running. I can do a "ps aux | grep vi" to pretty easily find the pid of the particular vi. It would be nice if the tool highlighted the terminal on my task bar in some way. Thanks. -Sam

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• How to Create Effective Error Reports

  - by John Paul Cook

  This post demonstrates some generic problem reporting steps that I encourage all users, whether developers or nontechnical end users, to follow. SQL Server has a feature that can help. So does Windows in some cases. More on those in Step 3. Step 1: Is the problem caused by a particular action undertaken on a gui? If so, you should get a screen capture. But if it is caused by executing some T-SQL code in a query window, just copy/paste the offending code as text. There are several ways to get a screen...(read more)

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• How to search drupal site from the new Unity lense?

  - by Ognjen

  I'm creating a simple Unity lense for my college site which is based on Drupal, but I don't know how to adapt this command for Drupal API. Please help, it's python. We now create our query url, using the Wikipedia opensearch API url = ("%s/w/api.php?action=opensearch&limit=25&format=json&search=%s" % (self.wiki, search)) I'm using template to write lense following Wikipedia example http://developer.ubuntu.com/2012/04/how-to-create-a-wikipedia-unity-lens-for-ubuntu/. I don't know python but Im familiar with C. This Drupal API calling is the only problem I have to successfully develop a lense. Please help!

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• transparent home directory encryption

  - by user86458

  #1 I'm very new to the ubuntu home directory encryption or rather ecryptfs folder encryption. I read about the same within Dustin's blog & tried implementing it. Problem or query is my home directory is encrypted & has a www folder ... now when I reboot the system the decryption doesnt happen at startup/boot & apache is not able to find the files rather the folder www since it is not mounted ... in order to mount it I have to login .... is there a way by which an encrypted home / private folder can be mounted at boot without human intervention ? #2 I have installed ubuntu server 11.10 & had selected "encrypt home directory" when installing the same. With ubuntu things are working transparently even after reboot & without logging in. Kindly can anyone pls explain or guide on the same ?

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• How should I handle "real time" events in an online strategy game?

  - by Hojat Taheri

  Some online strategy games have real time events. For example when you send troops to attack somewhere, the attack happens at the right time in the future. Checking the database again and again to get the list of attacks happening each second would cause heavy load. Is there any technique to achieve this goal? Another example: You want to attack a village 3 hours away, you send troops and the attack occurs 3 hours later. Should there be an script to check the database at each second to run the query at the specified time?

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• OSB, Service Callouts and OQL - Part 1

  - by Sabha

  Oracle Fusion Middleware customers use Oracle Service Bus (OSB) for virtualizing Service endpoints and implementing stateless service orchestrations. Behind the performance and speed of OSB, there are a couple of key design implementations that can affect application performance and behavior under heavy load. One of the heavily used feature in OSB is the Service Callout pipeline action for message enrichment and invoking multiple services as part of one single orchestration. Overuse of this feature, without understanding its internal implementation, can lead to serious problems. This post will delve into OSB internals, the problem associated with usage of Service Callout under high loads, diagnosing it via thread dump and heap dump analysis using tools like ThreadLogic and OQL (Object Query Language) and resolving it. The first section in the series will mainly cover the threading model used internally by OSB for implementing Route Vs. Service Callouts. Please refer to the blog post for more details. 

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• Configuring wsgi for a simple Python based site

  - by jbbarnes

  I have an Ubuntu 10.04 server that already has apache and wsgi working. I also have a python script that works just fine using the make_server command: if __name__ == '__main__': from wsgiref.simple_server import make_server srv = make_server('', 8080, display_status) srv.serve_forever() Now I would like to have the page always active without having to run the script manually. I looked at what Moin is doing. I found these lines in apache2.conf: WSGIScriptAlias /wiki /usr/local/share/moin/moin.wsgi WSGIDaemonProcess moin user=www-data group=www-data processes=5 threads=10 maximum-requests=1000 umask=0007 WSGIProcessGroup moin And moin.wsgi is as listed: import sys, os sys.path.insert(0, '/usr/local/share/moin') from MoinMoin.web.serving import make_application application = make_application(shared=True) QUESTION: Can I create a similar section in apache2.conf pointing to another wsgi file? Like this: WSGIScriptAlias /status /mypath/status.wsgi WSGIDaemonProcess status user=www-data group=www-data processes=5 threads=10 maximum-requests=1000 umask=0007 WSGIProcessGroup status And if so, what is required to convert my simple_server script into a daemonized process? Most of the information I find about wsgi is related to using it with frameworks like Django. I haven't found a simple howto detailing how to make this work. Thanks.

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