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• [Toplink] How to add c3p0 or DBCP Connection pool?

  - by Jean N.T.

  Hello, Could you please explain to me how to add a standalone c3pO or DBCP connection pool to my toplink-based JPA project? I have a persistence.xml file, and everytime I want to query the database, I'm doing this: EntityManagerFactory emf = this.getEntityManagerFactory(); // Surely using persistence.xml to set up the factory EntityManager em = emf.createEntityManager(); ... Where do I build the bridge between my external connection pool manager and Toplink? Any ideas or links are welcomed. Regards, Jean

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• unknown error in shell

  - by lego69

  can somebody explain me what does this error mean: > ./rank lines.in 'nknown option: `- Usage: tcsh [ -bcdefilmnqstvVxX ] [ argument ... ]. this is my script rank: #! /bin/tcsh -f set line = `cat ${1}` echo $line I think that the problem I have is with first row #! /bin/tcsh -f I'm working on Windows! but after I wrote script on windows editor, I converted it using dos2unix rank, what can be the problem, thanks in advance for any help

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• Why are Python exceptions named "Error"?

  - by Elena

  Why are Python exceptions named "Error" (e.g. ZeroDivisionError, NameError, TypeError etc) and not "Exception" (e.g. ZeroDivisionException, NameException, TypeException etc). I come from a Java background and started to learn Python recently, as such this is confusing because in java there is a distinction between error and exception. Is there a difference in Python also or not? Can someone explain or point me to some documentation explaining it? Thank you!

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• How to run .swc file in flex project?

  - by Jeeva

  I have a .swc file and I learned how to add that swc file into the library. I will be happy if any one explain how to use this .swc file into my flex project and run that with an example .

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• How can I build multiple processes with TBB?

  - by Jackie

  Now I plan to parallelize my sequential solver. I hope I could run several copies of my solver(maybe with different parameters) in parallel simultaneously on a multi-core computer. can I do this with TBB? The reason I ask this question is that the book says: do not introduce anything in your code that will not allow single-thread execution. Any experts can explain this issue? Thanks.

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• www-data ownership makes the wordpress instalation consume more memory

  - by Arkid

  I have a wordpress installation. When the ownership of the folder is root, the memory consumed is okay. However, when I change the ownership to www-data user, it starts consuming a lot of memory and starts throwing a lot of out of memory error. I have changed the ownership to root. However, Can anyone explain why this happens?

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• Explanation of this SQL sanitization code

  - by Derek

  I got this from for a login form tutorial: function clean($str) { $str = @trim($str); if(get_magic_quotes_gpc()) { $str = stripslashes($str); } return mysql_real_escape_string($str); } Could some one explain exactly what this does? I know that the 'clean' var is called up afterwards to sanitize the fields; I.e. $email = clean($_POST['email']);

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• what it is Sharepoint ? Main advantages for programmer

  - by netmajor

  Hey, For some time i see that employers demand from programmers knowing Sharepoint, but I have problem with understand what it is :/ But today I was at IT training, and main guy told something like that:" Sharepoint is platform for commit code for programmer, control of version etc..." It is true? It looks like SVN tool... Can someone explain me what advantages it have for c# programmer? Thanks ;)

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• why to use code generators

  - by Night Walker

  Hi all I have encountered this topic lately and couldn't understand why they are needed ... Can you explain me why i should use them in my projects and how they can ease my life . Examples will be great, and where from i can learn this topic little more . Thanks.

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• the coding problem in server

  - by zahir hussain

  $fp = fopen("http://feeds.reuters.com/Reuters/PoliticsNews?format=xml","r") or die("Error reading RSS data."); The above coding working correctly in localhost;;; but in server display "Error reading RSS data."... i dont know why.... anybody please explain me... i am waiting... thanks

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• what is difference between trigger And assertion and check

  - by Am1rr3zA

  Can any body explain (suggest site or paper) exact difference between trigger , assertion and check and also tell in what position I should use them?

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• Endian check in C

  - by webgenius

  Got this code snippet from some website: int num = 1; if(*(char *)&num == 1) { printf("\nLittle-Endian\n"); } else { printf("Big-Endian\n"); } Can anyone explain this step-by-step? &num - Adress of a (char *)&num - Type-cast address of a into a string *(char *)&num - Points to the first character of the string Am I missing anything here?

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• PHP OOP question about reference

  - by Starmaster

  Can one please explain with example what does $obj-$a()-$b mean? I've used PHP OOP quite a long time and have seen in some places this structure and not just this $obj-$a(); In what cases should I use it? Thanks in advance!

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• A DLL with WinForms that can be launched from A main app

  - by BDotA

  Hi all. I have created a C# DLL that has some forms in it. ( I needed it to be a DLL, not a Windows Application.) How can I run it as a Windows App? Should I create another app and load it? How? What do I need to learn to do that? please let me know if I should explain more about my question.

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• WPF Grid scroll

  I want to create two grids in the WPF Page. One grid need scrollbar or scroll viewer. Another grid is static.The grids are placed one by one in the page. How to create and set the scroll in first grid.? plz explain me.

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• XOR swap algorithm in python?

  - by TheMachineCharmer

  I tried to implement XOR sort in python. x,y= 10,20 x,y,x = x^y,x^y,x^y print('%s , %s'%(x,y)) OUTPUT: 30 , 30 I am not new to python but I am unable to explain this output. It should have been 20,10. What is going on under the hood?

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• Different techniques to bind the Data Controls - ASP.net

  - by nettguy

  Recently I was asked the following question at interview. "What are the different way to bind a Data Control in ASP.Net". I have answered Typed DataSet Collections Stored Procedure. The interviewer expecting a lot more. Can anyone explain me the different way that we can bind the data controls?

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• Strange declaration(templates). C++

  - by atch

  Hi, guys could anyone explain to my like to a not very inteligent child what is declared here: (this is taken from another post on this forum) template<typename C> static char (&f(ChT<int Fallback::*, &C::x>*))[1]; how I read it is: template of static function f called with (ChT*) but then I can't make sense why is there address of operator and why is there array? When explaining please picture not very inteligent child and then try to make it clear to it. Thanks for any help

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• array of pointers

  - by tushar

  char *a[]={"diamonds","clubs","spades","hearts"}; char **p[]={a+3,a+2,a+1,a}; char ***ptr=p; cout<<*ptr[2][2]; why does it display h and please explain how is the 2d array of ptr implementing and its elements

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• Prolog instantiation error?

  - by KP65

  Hello guys, I'm stuck with some sort of error which i don't really understand in prolog. I get this error when calling a rule(which seems to work sometimes?) : error(instantiation_error,Var0) Can anyone explain to me what this means? Thanks

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• can we use something IN and something NOT in mysql

  - by JPro

  I want to know if I can use something like this : If yes, then what will be order ? I dont seem to understand quite well the explain plan of mysql Select * from results where TestCase NOT IN (select TestCase from results where Verdict <> 'PASS' and StartTime > DATE_SUB(NOW(), INTERVAL 2 MONTHS)) and TestCase IN (Select TestCase from testcases where Type = 'NONOS') EDIT : Also how can I order by StartTime to display the latest first?

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• What is Covariance and Contravariance

  - by xyz

  Please explain me in simple terms (if possible simple example) the covariance and contravariance in c# .net . I know many are available(even in stackoverflow) but my problem is in which scenario I should use that is not explained in the articles that I am refering to. e.g. Covariance and Contravariance in Delegates (C# Programming Guide) Thanks

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• What are the benefits of left outer join vs nested aggregate selects to find the newest rows in a table?

  - by RenderIn

  I'm doing: select * from mytable y where y.year = (select max(yi.year) from mytable yi where yi.person = y.person) Is that better or worse from a performance aspect than: select y.* from mytable y left outer join mytable y2 on y.year < y2.year and y.person = y2.person where y2.year is null The explain plan/anecdotal evidence is inconclusive so I am wondering if in general one is better than the other.

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• How powerbuilder's datawindow executes insert command

  - by Archangel

  I am new to powerbuilder and having a lot of trouble using datawindows. I can't get my head around the insert mechanism of it. Can someone explain it to me, or at least point me in the right direction(article, tips etc...) ?

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• Internet service providers

  - by gautam kumar

  I am unclear about the differences between international, national, regional and local ISPs. Please explain the differences and their importance, with examples. I am new to this site, so please forgive me if my question is not up to your expectations.

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