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  • Is this class + constructor definition pattern overly redundant?

    - by Protector one
    I often come across a pattern similar to this: class Person { public string firstName, lastName; public Person(string firstName, string lastName) { this.firstName = firstName; this.lastName = lastName; } } This feels overly redundant (I imagine typing "firstName" once, instead of thrice could be enough…), but I can't think of a proper alternative. Any ideas? Maybe I just don't know about a certain design pattern I should be using here? Edit - I think I need to elaborate a little. I'm not asking how to make the example code "better", but rather, "shorter". In its current state, all member names appear 3 times (declaration, initialization, constructor arguments), and it feels rather redundant. So I'm wondering if there is a pattern (or semantic sugar) to get (roughly) the same behavior, but with less bloat. I apologize for being unclear initially.

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  • Sending variables in URLs in PHP with echo

    - by alexpelan
    Hi all, I can't really find good guidelines through google searches of the proper way to escape variables in URLs. Basically I am printing out a bunch of results from a mysql query in a table and I want one of the entries in each row to be a link to that result's page. I think this is easy, that I'm just missing a apostrophe or backslash somewhere, but I can't figure it out. Here's the line that's causing the error: echo "<a href = \"movies.php/?movie_id='$row['movie_id']'\"> Who Owns It? </a> "; and this is the error I'm getting: Parse error: syntax error, unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_STRING If you could elaborate in your answers about general guidelines for working with echo and variables in urls, that would be great. Thanks.

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  • string substitution regular expression not working in tcl

    - by Puneet Mittal
    i am trying to replace all the special characters including white space, hyphen, etc, to underscore, from a string variable in tcl. I wrote the code below but it doesn't seem to be working. set varname $origVar puts "Variable Name :>> $varname" if {$varname != ""} { regsub -all {[\s-\]\[$^?+*()|\\%&#]} $varname "_" $newVar } puts "New Variable :>> $newVar" one issue is that, instead of replacing the string in $varname, it is replacing the data inside $origVar. No idea why, and also i read the example code (for proper syntax) in my tcl book and according to that it should be something like this regsub -all {[\s-][$^?+*()|\\%&#]} $varname "_" newVar so i used the same syntax but it didn't work and gave the same result as modifying the $origVar instead of required $varname value.

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  • building an ASP NET MVC site, should i go with linq to sql?

    - by aspm
    so i'm about to start a new website from scratch and i've spent about a week trying to figure out what technology to go with. i'm sold on ASP NET MVC. i'm 100% sure i'm going to love using that. but what i am not so sure about yet is using LINQ 2 SQL. so far i've gathered some data... 1) stack overflow uses it - can't be that bad 2) can be REALLY slow if you don't take advantage of compiled queries 3) will always be slower than ADO net, but can be almost just as fast if using #2 in the proper places 4) is NOT the preferred MS solution (there was a thread here on SO about dropping support) i'm itching to use it, but just want to make sure it's the best for me. i come from a heavy ADO/stored procedure and traditional asp net background (this will be my first experience with ASP MVC).

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  • How do you PEP 8-name a class whose name is an acronym?

    - by Arrieta
    I try to adhere to the style guide for Python code (also known as PEP 8). Accordingly, the preferred way to name a class is using CamelCase: Almost without exception, class names use the CapWords convention. Classes for internal use have a leading underscore in addition. How can I be consistent with PEP 8 if my class name is formed by two acronyms (which in proper English should be capitalized). For instance, if my class name was 'NASA JPL', what would you name it?: class NASAJPL(): # 1 class NASA_JPL(): # 2 class NasaJpl(): # 3 I am using #1, but it looks weird; #3 looks weird too, and #2 seems to violate PEP 8. Thoughts?

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  • How to avoid exceptions catches copy-paste in .NET

    - by Budda
    Working with .NET framework I have a service with a set of methods that can generates several types of exceptions: MyException2, MyExc1, Exception... To provide proper work for all methods, each of them contains following sections: void Method1(...) { try { ... required functionality } catch(MyException2 exc) { ... process exception of MyException2 type } catch(MyExc1 exc) { ... process exception of MyExc1 type } catch(Exception exc) { ... process exception of Exception type } ... process and return result if necessary } It is very boring to have exactly same stuff in EACH service method with exactly same exceptions processing functionality... Is there any possibility to "group" these catch-sections and use only one line (something similar to C++ macros)? Probably something new in .NET 4.0 is related to this topic? Thanks. P.S. Any thoughts are welcome.

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  • Why Could Linq to Sql Submit Changes Fail for Updates Despite Data in Change Set

    - by KevDog
    I'm updating a set of objects, but the update fails on a SqlException that says "Incorrect Syntax near 'Where'". So I crack open SqlProfiler, and here is the generated SQL: exec sp_executesql N'UPDATE [dbo].[Addresses] SET WHERE ([AddressID] = @p0) AND ([StreetAddress] = @p1) AND ([StreetAddress2] = @p2) AND ([City] = @p3) AND ([State] = @p4) AND ([ZipCode] = @p5) AND ([CoordinateID] = @p6) AND ([CoordinateSourceID] IS NULL) AND ([CreatedDate] = @p7) AND ([Country] = @p8) AND (NOT ([IsDeleted] = 1)) AND (NOT ([IsNonSACOGZip] = 1))',N'@p0 uniqueidentifier,@p1 varchar(15),@p2 varchar(8000),@p3 varchar(10),@p4 varchar(2),@p5 varchar(5),@p6 uniqueidentifier,@p7 datetime,@p8 varchar(2)',@p0='92550F32-D921-4B71-9622-6F1EC6123FB1',@p1='125 Main Street',@p2='',@p3='Sacramento',@p4='CA',@p5='95864',@p6='725E7939-AEE3-4EF9-A033-7507579B69DF',@p7='2010-06-15 14:07:51.0100000',@p8='US' Sure enough, no set statement. I also called context.GetChangeSet() and the proper values are in the updates section. Also, I checked the .dbml file and all of the properties Update Check values are 'Always'. I am completely baffled on this one, any help out there?

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  • Deserialize array values to .NET properties using DataContractJsonSerializer

    - by James Cadd
    I'm working with the DataContractJsonSerializer in Silverlight 4 and would like to deserialize the following JSON: { "collectionname":"Books", "collectionitems": [ ["12345-67890",201, "Book One"], ["09876-54321",45, "Book Two"] ] } Into classes like the following: class BookCollection { public string collectionname { get; set; } public List<Book> collectionitems { get; set; } } class Book { public string Id { get; set; } public int NumberOfPages { get; set; } public string Title { get; set; } } What's the proper place to extend DataContractJsonSerializer to map the unnamed first array element in "collectionitems" to the Id property of the Book class, the second element to the NumberOfPages property and the final element to Title? I don't have control over the JSON generation in this instance and would like the solution to work with the Silverlight subset of .NET. It would be great if the solution could perform the reverse for serialization as well.

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  • MSSql Query solution cum Suggestion Required

    - by Nirmal
    Hello All... I have a following scenario in my MSSql 2005 database. zipcodes table has following fields and value (just a sample): zipcode latitude longitude ------- -------- --------- 65201 123.456 456.789 65203 126.546 444.444 and "place" table has following fields and value : id name zip latitude longitude -- ---- --- -------- --------- 1 abc 65201 NULL NULL 2 def 65202 NULL NULL 3 ghi 65203 NULL NULL 4 jkl 65204 NULL NULL Now, my requirement is like I want to compare my zip codes of "place" table and update the available latitude and longitude fields from "zipcode" table. And there are some of the zipcodes which has no entry in "zipcode" table, so that should remain null. And the major issue is like I have more then 50,00,000 records in my db. So, query should support this feature. I have tried some of the solutions but unfortunately not getting proper output. Any help would be appreciated...

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  • Operator Overloading with C# Extension Methods

    - by Blinky
    I'm attempting to use extension methods to add an operater overload to the C# StringBuilder class. Specifically, given StringBuilder sb, I'd like sb += "text" to become equivalent to sb.Append("text"); Here's the syntax for creating an extension method for StringBuilder: public static class sbExtensions { public static StringBuilder blah(this StringBuilder sb) { return sb; } } It successfully adds the "blah" extension method to the StringBuilder. Unfortunately, operator overloading does not seem to work: public static class sbExtensions { public static StringBuilder operator +(this StringBuilder sb, string s) { return sb.Append(s); } } Among other issues, the keyword 'this' is not allowed in this context. Are adding operator overloads via extension methods possible? If so, what's the proper way to go about it?

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  • Java vs c++ types

    - by folone
    I've recently had a question about coledatetime java implementation, and Chris said, that the problem might lay in type conversions: cpp-float vs java-float (Or maybe cpp-date vs java-date. Not types, but..). Now I have several questions on this: Is there a table of comparison for java vs c++ types? If type conversions is the problem, in my situation (I have a db with OLEDate records, already created with some c++ program. I need to read and write to that db, so that the OLEDate field compatibility remained: my java code reads proper dates, and c++ program is not affected with what the java program wrote to the db.), what would you do: Use COleDateTime to retrieve the date with JNI? Create your own implementation at all costs (using broader types, or anything else)? Is there anything, I'm missing here?

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  • string manipulations in C

    - by Vivek27
    Following are some basic questions that I have with respect to strings in C. If string literals are stored in read-only data segment and cannot be changed after initialisation, then what is the difference between the following two initialisations. char *string = "Hello world"; const char *string = "Hello world"; When we dynamically allocate memory for strings, I see the following allocation is capable enough to hold a string of arbitary length.Though this allocation work, I undersand/beleive that it is always good practice to allocate the actual size of actual string rather than the size of data type.Please guide on proper usage of dynamic allocation for strings. char *string = (char *)malloc(sizeof(char));

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  • Django-admin.py not being recognized suddenly

    - by Jen Camara
    I tried starting a new Django project yesterday but when I did "django-admin.py startproject projectname" I got an error stating: "django-admin.py is not recognized as an internal or external command." The strange thing is, when I first installed Django, I made a few projects and everything worked fine. But now after going back a few months later it has suddenly stopped working. I've tried looking around for an answer and all I could find is that this typically has to do with the system path settings, however, I know that I have the proper paths set up so I don't understand what's happening. Does anybody have any idea what's going on?

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  • C# + Disposing DbConnection and DbCommand and catching error

    - by Eatdoku
    Hi, I am trying to understand DbConnection and DbCommand, and the proper way to dispose those objects after use. Following is the code snippet I have. By using "using statement" on DbConnection and DbCommand, would it be sufficient? I am trying to prevent possible memory leak. 2nd question, Do I have to Dispose DbCommand object? thanks a lot DbProviderFactory fac = DbProviderFactories.GetFactory(this.DatabaseProviderName); using (DbConnection dbConn = fac.CreateConnection()) { dbConn.ConnectionString = this.ConnectionString; using (DbCommand comm = fac.CreateCommand()) { comm.CommandText = "select * from aTable"; comm.Connection = dbConn; DataTable targetTable = new DataTable(); DbDataAdapter facDA = fac.CreateDataAdapter(); facDA.SelectCommand = comm; facDA.Fill(targetTable); //assuming Adapter would open / close connection (right assumption?) //do something with the datatable } }

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  • Split string into smaller part with constrain [PHP RegEx HTML]

    - by Sadi
    Hello, I need to split long string into a array with following constrains: Each part will have a limited number of character (e.g. not more than 8000 character) Each part can contain multiple sentences (delimited by . [full stop]) but never a partial sentences. Except if the last part of the string (as last part may not have any full stop. The string may contain HTML tags. But the tag can not be divided as ( to ). That means HTML tag should be intact. But starting tag and ending tag can be stay on different segment/chunk. I think regular expression with preg_split can do it. Would please help me with the proper RegEx. Thank you Sadi

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  • WF4RC, How to: Activity to Xaml?

    - by johnny g
    Hello all, I have Googled a bit, and cannot seem to find any examples of Xaml-fying Activities - good, bad, or otherwise! public static string ToXaml (this Activity activity) { // i would use ActivityXamlServices to go from Xaml // to activity, but how to go other way? documentation // is slim, and cannot infer proper usage of // ActivityXamlServices from Xml remarks :S string xaml = string.Empty; return xaml; } Hints, tips, pointers would be welcome :) NOTE: so found this. Will work through and update once working. Anyone wanna beat me to the punch, by all means. Better yet, if you can find a way to be rid of WorkflowDesigner, seems odd it is required.

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  • Get last element of pipeline in powershell

    - by dozacinc
    Hi, This might be weird, but stay with me. I want to get only the last element of a piped result to be assigned to a varaiable. I know how I would do this in "regular" code of course, but since this must be a one-liner. More specifically, I'm interested in getting the file extension when getting the result from an FTP request ListDirectoryDetails. Since this is done within a string expansion, I can't figure out the proper code. Currently I'm getting the last 3 hars, but that is real nasty. New-Object PSObject -Property @{ LastWriteTime = [DateTime]::ParseExact($tempDate, "MMM dd HH:mm",[System.Globalization.CultureInfo]::InvariantCulture) Type = $(if([int]$tempSize -eq 0) { "Directory" } else { $tempName.SubString($tempName.length-3,3) }) Name = $tempName Size = [int]$tempSize } My idea was doing something similar to $tempName.Split(".") | ? {$_ -eq $input[$input.Length-1]} that is, iterate over all, but only take out where the element I'm looking at is the last one of the input-array. What am I missing ? Fire at will /M

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  • Elegant PostgreSQL Group by for Ruby on Rails / ActiveRecord

    - by digitalfrost
    Trying to retrieve an array of ActiveRecord Objects grouped by date with PostgreSQL. More specifically I'm trying to translate the following MySQL querry: @posts = Post.all(:group => "date(date)", :conditions => ["location_id = ? and published = ?", @location.id, true], :order => "created_at DESC") I am aware that PostgreSQL interpretation of the SQL standard is stricter than MySQL and that consequently this type of query won't work...and have read a number of posts on StackOverflow and elsewhere on the subject - but none of them seem to be the definitive answer on this subject I've tried various combinations of queries with group by and distinct clauses without much joy - and for the moment I have a rather inelegant hack which although works makes me blush when I look at it. What is the proper way to make such a querry with Rails and PostgreSQL ? (Ignoring the fact that surely this should be abstracted away at the ActiveRecord Level)

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  • Why is there so much poorly indented code out there?

    - by dsimcha
    The more I browse the code to open source projects in languages that aren't Python, the more I realize that it seems a lot of programmers don't believe in proper indentation. (I won't mention any projects specifically to avoid having anyone take this question too personally.) Usually code is indented, but in a way just different enough from the standard style that it drives me crazy, especially in old/crufty code. I've noticed that when I write in C-like languages, I tend to indent correctly as religiously as when I'm writing in Python, with the exception of debugging code that I actually want to stick out like a sore thumb. Given how easy it is with a modern IDE to fix incorrect indentation, what are some rationales for not religiously keeping indentation in sync with braces?

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  • Why does _GET in PHP wrongly decodes slash?

    - by Boaz
    Hi, Today I run into some oddity with PHP, which I fail find a proper explanation for in the documentation. Consider the following code: <?php echo $_GET['t']. PHP_EOL; ?> The code is simple - it takes a single t parameter on the url and outputs it back. So if you call it with test.php?t=%5Ca (%5c is a '\'), I expected to see: \a However, this is what I got: $ curl http://localhost/~boaz/test.php?t=%5Ca \\a Notice the double slash. Can anyone explains what's going on and give recipe for retrieving the strings as it was supplied on the URL? Thanks, Boaz

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  • Is it possible / recommendable sending HTML emails containing Javascript?

    - by Adriano Varoli Piazza
    This is mostly a rhetorical question, as far as I've checked the answer is 'don't even bother', but I wanted to be really sure. We have an email app, where you can send email to lists of subscribers. This is not spam: it's used, for example, by an university to send communications to its students, by a museum to send emails to subscribers, etc. Recently, I was asked by a prospective client if it was possible to send html messages containing javascript without being marked as spam. Not knowing, I did a short trip of the webs and what I've got is (percentages out of my posterior) 'half the clients won't display properly', 'half the clients will flag you as spam' and 'half the clients will have blocked javascript altogether' (There's clearly some superposition). So the best solution seems to be adding a link to a proper page if really necessary. Have you got a different experience? Do you know of any email-merge solution that provides this feature? Do you know if specific clients accept it or refuse to display html with javascript?

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  • how to add connection string for a windows form applicaton in asp.net

    - by manoj chalode
    i am working on windows form application and i want to add connection string of a database in. Right now, though i can access database i don't know the proper reasoning behind it. I have created a database and added it in a "Database" folder. The code for it is given below. i also want to know how can I make a connection string which can work on different PCs without changing it (I'm talking about relative path given in the "AttachDbFilename" attribute in the connection string). Reply... Conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename="+ Application.StartupPath + "\\Database\\Database.mdf;Integrated Security=True;User Instance=True");

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  • How do I use "this" in a member function?

    - by Peter Stewart
    I've written a member function of class Node to read a tree of Nodes in postfix order. It will be called by the Node instance which is the root node of the tree. So: N.postfix(); these appear to be illeagal: *this->left.postfix(); *this->right.postfix(); What is the proper way to do this? class Node { public: const char *cargo; int depth; Node *left; Node *right void Node::postfix() { if (this==__nullptr) { return; } else { *this->left.postfix(); *this->right.postfix(); out<<*this->cargo<<"\n"; return; } };

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  • Do I need multiple template specializations if I want to specialize for several kinds of strings?

    - by romkyns
    For example: template<typename T> void write(T value) { mystream << value; } template<> void write<const char*>(const char* value) { write_escaped(mystream, value); } template<> void write<char*>(char* value) { write_escaped(mystream, value); } template<> void write<std::string>(std::string value) { write_escaped(mystream.c_str(), value); } This looks like I'm doing it wrong, especially the two variants for const and non-const char*. However I checked that if I only specialize for const char * then passing a char * variable will invoke the non-specialized version, when called like this in VC++10: char something[25]; strcpy(something, "blah"); write(something); What would be the proper way of doing this?

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