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• How can I create a list of classes in C# to iterate over in a loop

  - by Jean-Bernard Pellerin

  Suppose I have class animal and classes cat and dog extending it. I want to do something along the lines of: foreach (animal a in {cat, dog}) if (a.isValid(parameters)) doStuff(); My only alternative is a switch statement for each class, something I'd like to avoid. Thanks, J-B

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• Should mutex.WaitOne() inside or before the try/finally block.

  - by chillitom

  Hi Guys, I was wondering which of the following was the suggested pattern when using Mutex (or Semaphores or ReadWriteLockSlims etc.). Should the initial lock happen inside or outside of the try statement? Is it unimportant? _mutex.WaitOne() try { // critical code } finally { _mutex.ReleaseMutex(); } or try { _mutex.WaitOne() // critical code } finally { _mutex.ReleaseMutex(); }

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• Java Regular Expression. Check if String contains ONLY Letters

  - by user69514

  How do I check if a String contains only letters in java? I want to write an if statement that will return false if there is a white space, a number, a symbol or anything else other than a-z A-Z. My string must contain ONLY letters. I thought I could do it this way, but I'm doing it wrong: if( ereg("[a-zA-Z]+", $myString)) return true; else return false;

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• Is it possible to use 'else' in a python list comprehension?

  - by Josh

  Here is the code I was trying to turn into a list comprehension: table = '' for index in xrange(256): if index in ords_to_keep: table += chr(index) else: table += replace_with Is there a way to add the else statement to this comprehension? table = ''.join(chr(index) for index in xrange(15) if index in ords_to_keep) Also, would I be right in concluding that a list comprehension is the most efficient way to do this?

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• In Python, can I single line a for loop over iterator with an IF filter?

  - by Tal Weiss

  Silly question: I have a simple for loop followed by a simple if statement: for airport in airports: if airport.is_important: and I was wondering if I can write this as a single line somehow. So, yes, I can do this: for airport in (airport for airport in airports if airport.is_important): but it reads so silly and redundant ("for airport in airport for airport in airports..."). Is there a better way?

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• LINQ causing my obfuscator to break

  - by JL

  I have the following LINQ that is causing my obfuscator to break. .Where(f => f.FileName == fileName).OrderByDescending(f => f.Position).FirstOrDefault(); Is there another way I could reword this LINQ statement to test against my obfuscator? I've reported the bug, but it could take 1-2 months to fix, so I need to try recode this LINQ in the meantime.

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• How do I empty Drupal Cache (without Devel)

  - by alexanderpas

  Okay... Seems i can't find it with google... so here you go SO ;) How do i empty the drupal caches: without the Devel module without running some PHP Statement in a new node etc. without going into the database itself Effectively, how do you instruct a luser to clear his caches

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• SQL CASE Question

  - by docsql

  Hiya, I dont know if this can be done but i'd though i'd ask. What I want to do is have a case statement query and if a 1 begin another action. if 0 dont do anything. For Example select CASE WHEN client.deathofdeath = yes THEN 1 do another select in here (which is another table) Else 0 End AS DeathDate From Client client Can this be done?

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• How to create a table in a particular database?

  - by liuxingruo

  The create database statement is: CREATE TABLE table_name ( column_name1 data_type, column_name2 data_type, column_name3 data_type, .... ) but, I'm wondering how can I create a table in a specific database? thanks, guys!

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• Update String Columns without Using Single Quotations - General Question

  - by peace

  UPDATE CustomerPhone SET PhoneTypeID = 7, PhoneNumber = 999-444 WHERE CustomerID = 500 AND PhoneNumber = 9-1-1; PhoneNumber is of type varchar(20) whereas PhoneTypeID and CustomerID are of type int. I'm running the above statement in SQL Server, it works fine. I wonder how come it works? I thought any string value has to be put between '...'

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• C# equivalent to VB.NET Catch ... When

  - by fung

  In VB.NET I often Catch ... When ... Try ' Some code' Catch e As ArgumentNullException When e.ParamName.ToUpper() = "SAMPLES" ' Handle the error' End Try Is there a C# equivalent to Catch ... When? I don't want to resort to using an if statement inside a catch if possible.

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• SQLite3 Integer Max Value

  - by peterwkc

  Hello to all, what is the maximum value of data type INTEGER in sqlite3 ? How do you store ip address in database ? What is attached ? How to create table which belongs to a specific database using sql ddl? What is this error about ? error while the list of system catalogue : no such table: temp.sqlite_master Unable to execute statement Does sqlite3 text data type supoports unicode? Thanks.

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• Example for creating a configuration

  - by Steven

  hi, i am facing some difficulties in creating a session. Can anyone provide me an example or link where a configuration is created by using an external file by giving url,like Configuration config = new Configuration.configure(url); the cinfig file is in another hibernate project. is there anything that i should add to classpath or store the config file. My app is just getting hanged there at that statement.Help

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• How do I create a custom loop in wordpress that excludes categories listed in theme options

  - by mattloak

  I have a custom loop that excludes categories using this code: query_posts(array('category__not_in' => array(2,6))); Instead of specifying the categories to exclude in the code, I'd like to be able to set the option in my custom theme options menu. The code to call the option is get_option('ex_cats');. How do I call this in my query_posts statement?

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• Problem with writing a file to excel with spreadsheet

  - by winter sun

  I am trying to write excel file by using ruby 1.9 spreadsheet version 0.6.4.1 on windows. Everything is going ok, until I get to the book.write statement when I write book.write "c:/spreadsheet/excel-file.xls I keep getting the following error No such file or directory - c:/spreadsheet/excel-file.xls Can anyone tell me what I should change in this path name?

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• Three level heirarchal data-linq

  - by user326010

  Hi I have three level heirarchal data. using the statement below i managed to display two level data. I need to extend it to one more level. Current heirachy is Modules--Documents I need to extend it as Packages--Modules--Documents var data = (from m in DataContext.SysModules join d in DataContext.SysDocuments on m.ModuleID equals d.ModuleID into tempDocs from SysDocument in tempDocs.DefaultIfEmpty() group SysDocument by m).ToList(); Regards Tassadaque

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• Cleaning up a SQL SP with Regex

  - by Douglas Osborne

  1) If I am running a find and replace in SQL 2005 - what would be the regular expression to find tab and space sequences ( or space and tab sequences ) and replace them with just tab? 2) If I have a line which begins with a space - is there a regular expression to convert that leading space to a tab? 3) What would be the regular expression to remove all of the spaces before a CR/LF in a SQL statement? TIA for the help - I know this will be trivial to most of you, Doug

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• I need to insert multiple rows at once in sql server ..based on an iterative value

  - by sajad

  Hi friends, I want to insert 3 rows at a time in a table based on select statement.. consider the query insert into tblTemp ( a,b ) select a, b from tblTemp2 This lets me insert one row in tblTemp.. my requirement is to add 3 rows with iterative values a,a+1,a+2 for each b inserted.

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• spanish characters replaced with wierd string when 'stringWithFormat' is used?

  - by surajbaba

  NSString *myString = [NSString stringWithFormat:@"%@",BernabÈu]; NSLog(@"%@", myString); Above statement prints: Bernab\u00c8u Here 'BernabÈu' is spanish character string Why "\u00c8u" appended .How to get rid of this

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• How do you create a transaction that spans multiple statements in Python with MySQLdb?

  - by Fast Fish

  I know that with an InnoDB table, transactions are autocommit, however I understand that to mean for a single statement? For example, I want to check if a user exists in a table, and then if it doesn't, create it. However there lies a race condition. I believe using a transaction prior to doing the select, will ensure that the table remains untouched until the subsequent insert, and the transaction is committed. How can you do this with MySQLdb and Python?

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• virtual function == function pointer?

  - by httpinterpret

  A set of function pointers grouped into a data structure are often referred to as a virtual function table (VFT). The above statement makes me feel that virtual function == function pointer,is that so?

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• references in C++

  - by Alexander

  Once I read in a statement that The language feature that "sealed the deal" to include references is operator overloading. Why are references needed to effectively support operator overloading?? Any good explanation?

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• why do i have to open a file in binary mode to write in it in c?

  - by mekasperasky

  fprintf(file, "%d %d %d", array[0], array[1], array[2]); for this statement to work i have to open the file in 'wb' mode rather than 'w' mode . How does a binary mode make the syntax work?

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• Dispose a Web Service Proxy class?

  - by Matt

  When you create and use a Web Service proxy class in the ASP.Net framework, the class ultimately inherits from Component, which implements IDisposable. I have never seen one example online where people dispose of a web proxy class, but was wondering if it really needs to be done. When I call only one method, I normally wrap it in a using statement, but if I have a need to call it several times throughout the page, I might end up using the same instance, and just wondered what the ramifications are of not disposing it.

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• How do I make functions run by g_idle_add/g_timeout_add work asynchronously?

  - by httpinterpret

  g_timeout_add (100, (GSourceFunc) read_next_packets, NULL); I can feel the GUI response is slow because of the above statement. How can I make it work asynchronously so that it doesn't affect the GUI response?

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