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  • singleton vs factory?

    - by fayer
    i've got 3 Log classes that all implements iLog interface: DatabaseLog FileLog ScreenLog there can only be one instance of them. initially i though of using single pattern for each class but then i thought why not use a factory for instantiation instead, cause then i wont have to create single pattern for each one of them and for all future Log classes. and maybe someone would want them as multiple objects in the future. so my questions is: should i use factory or singleton pattern here?

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  • PDO::fetchAll vs. PDO::fetch in a loop

    - by Byron
    Just a quick question. Is there any performance difference between using PDO::fetchAll() and PDO::fetch() in a loop (for large result sets)? I'm fetching into objects of a user-defined class, if that makes any difference. My initial uneducated assumption was that fetchAll might be faster because PDO can perform multiple operations in one statement while mysql_query can only execute one. However I have little knowledge of PDO's inner workings and the documentation doesn't say anything about this, and whether or not fetchAll() is simply a PHP-side loop dumped into an array. Any help?

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  • sftp vs "FTP over SSH" c#

    - by sundar venugopal
    i am looking for sftp client in c# SSH File Transfer Protocol (SFTP) i come across http://sourceforge.net/projects/sharpssh http://granados.sourceforge.net/ after exploring i will use them. while trying to understand the basics. i come across the help text http://en.wikipedia.org/wiki/FTP_over_SSH#FTP_over_SSH_.28not_SFTP.29 which is confusing . could some one explain it for me what is difference between sftp and FTP over SSH. no library seems to give support for "FTP over SSH" if it is different.

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  • UML class diagram vs ER database diagram

    - by salva84
    Hi, I'm a little confused, I'm developing a program, the program consist in two parts, the server and the clients, there are groups, places, messages... stored in the server, and the clients has to connect with it. I've design the use cases diagram, the activity diagrams, and I have design the class diagram too. The thing is that I want to implement the server in a mysql tables for storing the users, groups, places... users in groups... so I've designed a E-R diagram consisting in 6 tables, but the problem is that I think that my class diagram and my ER diagram looks too similar, I mean, I think I'm not doing things right because I have a class for each table practically, and when I have to extract all the users on my system, do I have to convert all the rows into objects at first and write in the database for each object modified? The easy choice for me would be to base my whole application only in the database, and making a class to extract and insert data in it, but I have to follow the UML specification and I'm a little confused what to do with the class diagram, because the books I have read say that I have to create a class for each "entity" of my program. Sorry for my bad English. Thank you.

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  • MongoDb vs Ehcache caching advise for speeding up read only mysql Database

    - by paddydub
    I'm building a Route Planner Webapp using Spring/Hibernate/Tomcat and a mysql database, I have a database containing read only data, such as Bus Stop Coordinates, Bus times which is never updated. I'm trying to make the app run faster, each time the application is run it will preform approx 1000 reads to the database to calculate a route. I have setup a Ehcache which greatly improves the read from database times. I'm now setting terracotta + Ehcache distributed caching to share the cache with multiple Tomcat JVMs. This seems a bit complicated. I've tried memcached but it was not performing as fast as ehcache. I'm wondering if a MongoDb would be better suited. I have no experience with nosql but I would appreciate if anyone has any ideas. All i need is quick access to the read only database.

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  • JBOSS Security: web.xml vs. jboss-web.xml

    - by sixtyfootersdude
    What is the relation between web.xml and jboss-web.xml? Seems like: Jboss-web.xml specifies the security domain (which can be found in login-config.xml) web.xml specifies what the security level is I don't understand what happens when jboss-web.xml specifies a weak security domain. Ie: one that cannot do what web.xml specifies. What happens then?

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  • SQL : where vs. on in join

    - by Erwin
    Perhaps a dumb question, but consider these 2 tables : T1 Store Year 01 2009 02 2009 03 2009 01 2010 02 2010 03 2010 T2 Store 02 Why is this INNER JOIN giving me the results I want (filtering the [year] in the ON clause) : select t1.* from t1 inner join t2 on t1.store = t2.store and t1.[year] = '2009' Store Year 02 2009 And why the LEFT OUTER JOIN include records of year 2010 ? select t1.* from t1 left outer join t2 on t1.store = t2.store and t1.year = '2009' where t2.store is null 01 2009 03 2009 01 2010 02 2010 03 2010 And I have to write the [year] filter in the 'WHERE' clause : select t1.* from t1 left outer join t2 on t1.store = t2.store where t2.store is null and t1.year = '2009' 01 2009 03 2009 Like I said, perhaps a dumb question, but it's bugging me !

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  • Action -methods vs public methods in PHP frameworks

    - by Tower
    There are plenty of PHP frameworks out there as many of you know, and I am interested in your thoughts on this: Zend Framework has so-called action controllers that must contain at least one action method, a method whose name ends in "Action". For example: public function indexAction() {} The word "Action" is important, without it you can't access the method directly via the URI. However, in some other frameworks like Kohana you have public and private methods, where public methods are accessible and private are not. So my question is which do you think is a better approach? From a secure point of view I would vote Zend's approach, but I am interested in knowing what others think.

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  • ItemsControl ItemsTemplate vs ContentTemplate

    - by Allen Ho
    Hi, Is there any difference between setting the ContentTemplate of a ListBoxItem, compared to setting the ItemsTemplate on the ListBox? Or is it just a preference? Just say you set the ItemsTemplate of the ListBox can you still get the Data Template you assigned to the ListBox ItemsTemplate via the ListBoxItems ContentTemplate? ie. Like below ListBoxItem myListBoxItem = ...; ContentPresenter myContentPresenter = FindVisualChild(myListBoxItem); DataTemplate myDataTemplate = myContentPresenter.ContentTemplate;

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  • All about WSDL vs MEX?

    - by Aakash
    I am not able to open the meta data url - http://localhost:8082/Tasks/mex I have added the mexhttpBinding in the config file. Can I see this mex endpoint in browser? The config files look like: <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> Questions: Is Mex is differ from WSDL? If no, why do we require MEX endpoing over WSDL? In the WSDL, I see the WSDL types information missing. Is it by default? Can I look at the type information in WSDL? Thanks in advance.

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  • Appengine Apps Vs Google bot web crawler

    - by sandeep koduri
    i built an appengine web app cricket.hover.in. The web app consists of about 15k url's linked in it, But even after a long time of my launch, no pages are indexed on google. Any base link place on my root site hover.in are being indexed with in minutes. but i placed the same link home page of root site a long back. but its of no use. can any one analyse , if there is any issue with cricket.hover.in or if bots have any issues with Google app engine actually tested the url using labs app of webmaster tools of google there the return is fine and html is clear. but when tested the same (cricket.hover.in) at the following urls its showing different results of failure www.dnsqueries.com/en/googlebot_simulator.php www.smart-it-consulting.com/internet/google/googlebot-spoofer/ but if i test some of my php or word press links at the above url's the results are good and fine. please help me with this.

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  • PHP5 vs ASP.NET

    - by Lee
    Hi guys, I am required to write a report contrasting PHP5 and ASP.NET after building an application in both languages. I've been looking for papers and resources to reference and quote on the subject but i am running a little short. I was wondering if anyone directions as where i could find such papers / resources. Thanks in advance.

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  • Derby vs PostgreSql Performance Comparison

    - by Austin
    We are doing research right now on whether to switch our postgresql db to an embedded Derby db. Both would be using glassfish 3 for our data layer. Anybody have any opinions or knowledge that could help us decide? Thanks! edit: we are writing some performance tests ourselves right now. Looking for answers more based on experience / first hand knowledge

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  • Desktop development vs Web development

    - by Sahat
    After doing some google search I've came to conclusion that desktop development is shifting to the web development. Recent demos of HTML5 show us 3D accelerated games running inside of a browser. Is it true that desktop development is slowly dying? Would it make more sense learning ASP.NET, Silverlight and HTML5 rather than the desktop side of .NET such as WinForms and WPF. Who is leading current job trends: Software development or Web development? Who will lead in the near future?

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  • javamail vs sendmail performance during bulk email

    - by Glenn2041
    Hi all, I'm writing a Java mass emailer application to send out emails to send between 50,000 to 100,000 a day to users. The current plan is to delegate the sending to delegate to sendmail (on the local unix server). From our testing sendmail is sending a maximum of 5 emails per second. Would JavaMail be a faster option? Does anyone know what a faster way to send emails. We want to get this process out as quick as possible. Edit: BTW, a pdf will be attached too

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  • Best Practices - Data Annotations vs OnChanging in Entity Framework 4

    - by jptacek
    I was wondering what the general recommendation is for Entity Framework in terms of data validation. I am relatively new to EF, but it appears there are two main approaches to data validation. The first is to create a partial class for the model, and then perform data validations and update a rule violation collection of some sort. This is outlined at http://msdn.microsoft.com/en-us/library/cc716747.aspx The other is to use data annotations and then have the annotations perform data validation. Scott Guthrie explains this on his blog at http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx. I was wondering what the benefits are of one over the other. It seems the data annotations would be the preferred mechanism, especially as you move to RIA Services, but I want to ensure I am not missing something. Of course, nothing precludes using both of them together. Thanks John

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  • Tomcat threads vs Java threads

    - by black666
    When using java threads, one has to take care of the basic problems that come with concurrency through synchronization etc. AFAIK Tomcat also works with threads to handle its workload. Why is it, that I don't have to think about making my code threadsafe when it is running in Tomcat?

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  • Mysql password hashing method old vs new

    - by The Disintegrator
    I'm trying to connect to a mysql server at dreamhost from a php scrip located in a server at slicehost (two different hosting companies). I need to do this so I can transfer new data at slicehost to dreamhost. Using a dump is not an option because the table structures are different and i only need to transfer a small subset of data (100-200 daily records) The problem is that I'm using the new MySQL Password Hashing method at slicehost, and dreamhost uses the old one, So i get $link = mysql_connect($mysqlHost, $mysqlUser, $mysqlPass, FALSE); Warning: mysql_connect() [function.mysql-connect]: OK packet 6 bytes shorter than expected Warning: mysql_connect() [function.mysql-connect]: mysqlnd cannot connect to MySQL 4.1+ using old authentication Warning: mysql_query() [function.mysql-query]: Access denied for user 'nodari'@'localhost' (using password: NO) facts: I need to continue using the new method at slicehost and i can't use an older php version/library The database is too big to transfer it every day with a dump Even if i did this, the tables have different structures I need to copy only a small subset of it, in a daily basis (only the changes of the day, 100-200 records) Since the tables are so different, i need to use php as a bridge to normalize the data Already googled it Already talked to both support stafs The more obvious option to me would be to start using the new MySQL Password Hashing method at dreamhost, but they will not change it and i'm not root so i can't do this myself. Any wild idea? By VolkerK sugestion: mysql> SET SESSION old_passwords=0; Query OK, 0 rows affected (0.01 sec) mysql> SELECT @@global.old_passwords,@@session.old_passwords, Length(PASSWORD('abc')); +------------------------+-------------------------+-------------------------+ | @@global.old_passwords | @@session.old_passwords | Length(PASSWORD('abc')) | +------------------------+-------------------------+-------------------------+ | 1 | 0 | 41 | +------------------------+-------------------------+-------------------------+ 1 row in set (0.00 sec) The obvious thing now would be run a mysql SET GLOBAL old_passwords=0; But i need SUPER privilege to do that and they wont give it to me if I run the query SET PASSWORD FOR 'nodari'@'HOSTNAME' = PASSWORD('new password'); I get the error ERROR 1044 (42000): Access denied for user 'nodari'@'67.205.0.0/255.255.192.0' to database 'mysql' I'm not root... The guy at dreamhost support insist saying thet the problem is at my end. But he said he will run any query I tell him since it's a private server. So, I need to tell this guy EXACTLY what to run. So, telling him to run SET SESSION old_passwords=0; SET GLOBAL old_passwords=0; SET PASSWORD FOR 'nodari'@'HOSTNAME' = PASSWORD('new password'); grant all privileges on *.* to nodari@HOSTNAME identified by 'new password'; would be a good start?

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