instruction stringlengths 0 30k ⌀ |
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from the rhino book:
In JavaScript, strings are immutable objects, which means that the characters within them may not be changed and that any operations on strings actually create new strings. Strings are assigned by reference, not by value. In general, when an object is assigned by reference, a change made to th... |
[This post][1] addresses your question. The gist of it is:
Text Editor > C# > Advanced > Generate XML documentation comments for ///
[1]: http://forums.msdn.microsoft.com/en-US/csharpide/thread/a41e3652-efe2-4f81-ad3e-94994974fcb2/ |
How to get hashes out of arrays in Perl? |
|perl|arrays|hash| |
I want to write a little "DBQuery" function in perl so I can have one-liners which send an SQL statement and receive back and an array of hashes, i.e. a recordset. However, I'm running into an issue with Perl syntax (and probably some odd pointer/reference issue) which is preventing me from packing out the information ... |
I have various filters in my .procmailrc file, but the most useful is this one, which I add to the very top of the file before I make any other changes.
:0 c:
mail.save
This saves a copy of everything and then continues with the rest of the recipes. If I've done something wrong, my e-mail is saved in th... |
Using the result of a command as an argument in bash? |
|bash|command-line| |
To create a playlist for all of the music in a folder, I am using the following command in bash:
ls > list.txt
I would like to use the result of the **pwd** (print working directory) command for the name of the playlist.
Something like:
ls > ${pwd}.txt
That doesn't work though - can anyone tell m... |
To create a playlist for all of the music in a folder, I am using the following command in bash:
ls > list.txt
I would like to use the result of the **pwd** (print working directory) command for the name of the playlist.
Something like:
ls > ${pwd}.txt
That doesn't work though - can anyone tell m... |
With the [ByteArray][1] you can do pretty much what you want. Before starting playback you can analyze the bytes of the FLV header (use byteArray.readByte() and refer to the specs) to determine to check if the audio flag is on. Since the FLV header is loaded almost instantly this shouldn't cause any inconvenient delay ... |
The objects in my apps tend to relate one-to-one to the database, but I'm finding using Linq To Sql rather than sprocs makes it much easier writing complicated queries, especially being able to build them up using the deferred execution. e.g. from r in Images.User.Ratings where etc. This saves me trying to work out sev... |
To do literally what you said, you could try:
ls > `pwd`.txt
which will use the full pathname, which should be fine.
Note that if you do this in your home directory, which might
be in /home/hoboben, you will be trying the create /home/hoboben.txt,
a text file in the directory above.
Is this what you wan... |
To me the fundamental difference is that Java Iterators point between items, whereas C++ STL iterators point at items.
|
It's not built-in. Maybe try a macro? You should be able to make almost any keyboard short you want that way. |
It's not built-in. I would try a macro - AutoKeys? You should be able to make almost any keyboard short you want that way. |
Converting scripts from ksh to bash. |
|unix|bash|ksh| |
I have some ksh scripts which I'd like to convert to run with bash instead.
Are there any useful on-line resources for this?
I'm really looking for a list of differences between the two shells and any gotchas I might encounter, although all information is welcome :-) |
Congratulations on the new job!
Relax and keep your cool. Read something on [Refactoring][1].
I guess, the process itself will make sure you are productive as long as you apply common sense :)
[1]: http://www.refactoring.com/sources.html |
The difference between the connections strings in SQLCLR |
|sqlclr| |
I was reviewing some code that a consultant checked in and notice they were using SQLCLR. I don't have any experience with it so thought I would research what it was about. I noticed that they used
Dim cn As New SqlConnection("server=LOCALHOST;integrated security=yes;database=" & sDb)
instead of
DIM conn As ... |
Great question!
I would say the first thing to do is get the daily scrums going. Your part in the scrum will be learning the code. It will provide you a way to ask questions and get a feel for who can help you learn the code.
Once you have that guy (or guys) picked out start pair programming with them. Let the... |
Yes, it’s *not possible*. You can’t add privileges to the worker process without opening the server up to potential security / DOS problems in a production environment. An installer (like a MSI) usually runs with elevated permissions, and installs / uninstalls the performance counter categories and counters as well as ... |
Does Alt Q Alt R (ie menu item selection) not suit? |
I think we are going to go the third party route. I like the XSL -> HTML -> PDF -> Printer flow... Winnovative's [HTML to PDF][1] looks good for the first part, but I'm running into a block finding a good PDF printing solution... any suggestions?
[1]: http://www.winnovative-software.com/ |
I think we are going to go the third party route. I like the XSL -> HTML -> PDF -> Printer flow... Winnovative's [HTML to PDF][1] looks good for the first part, but I'm running into a block finding a good PDF printing solution... any suggestions? Ideally the license would be on a developer basis, not on a deployed ru... |
There's [ActiveRecord the Design Pattern](http://en.wikipedia.org/wiki/Active_record_pattern) and [ActiveRecord the Rails ORM Library](http://api.rubyonrails.com/classes/ActiveRecord/Base.html), and there's also a ton of knock-offs for .NET, and other languages.
These are all different things. They mostly follow tha... |
There's [ActiveRecord the Design Pattern](http://en.wikipedia.org/wiki/Active_record_pattern) and [ActiveRecord the Rails ORM Library](http://api.rubyonrails.com/classes/ActiveRecord/Base.html), and there's also a ton of knock-offs for .NET, and other languages.
These are all different things. They mostly follow tha... |
I don't know if it's best practice but I have written similar code in the not so recent past because I too felt that I could improve the separation of concerns by using my own classes instead of the LINQ-designer-generated ones within my application.
You may want to consider just returning an IQueryable<Customer&... |
Performance tip:
If you have to concatenate large strings, put the string parts into an array and use the Array.Join() method to get the overall string. This can be many times faster for concatenating a large number of strings.
No StringBuilder in javascript. |
In addition to the places where they're syntactically required like the string % operation and for multiple return values, I use tuples as a form of lightweight classes. For example, suppose you have an object that passes out an opaque cookie to a caller from one method which is then passed into another method. A tup... |
log4j is a much nicer package overall, and doesn't have some of the hiccups that java.util.logging contains. I'd second that using log4j directly is easier than using the commons logging. |
Can a STP template be hidden from subsite creation page? |
|sharepoint|templates|moss| |
When a template is added using the addtemplate stsadm command, it becomes available to everyone when creating a subsite. Is there any way to make it only available when a site collection is being created? |
Parasoft has a tool called Insure++ (link: http://www.parasoft.com/jsp/products/quick_facts.jsp?product=Insure) which says it'll do that.
I've used Insure++ on 32-bit and 64-bit apps on Linux and it worked okay. It sometimes got confused when it was trying to parse template/stl code and would fall over.
That url... |
To do literally what you said, you could try:
ls > `pwd`.txt
which will use the full pathname, which should be fine.
Note that if you do this in your home directory, which might
be in /home/hoboben, you will be trying the create /home/hoboben.txt,
a text file in the directory above.
Is this what you wan... |
Showing a tooltip for a MenuItem |
|.net|winforms| |
I've got a menu that contains, among other things, some most-recently-used file paths. The paths to these files can be long, so the text sometimes gets clipped like "C:\Progra...\foo.txt"
I'd like to pop a tooltip with the full path when the user hovers over the item, but this doesn't seem possible with the [Toolti... |
Compiling code on an external drive |
|visual-studio|hardware| |
To make things easier when switching between machines (my workstation at the office and my personal laptop) I have thought about trying an external hard drive to store my working directory on. Specifically I am looking at Firewire 800 drives (most are 5400 rpm 8mb cache). What I am wondering is if anyone has experien... |
Safari is really standards compliant. Unless you're using some really esoteric browser features, in general if something works in Firefox, I've found it works without modification in Windows Safari.
Apple has [a developer center for web developers][1], but I didn't find anything too useful there.
[1]: http://d... |
I use vmware and the virtual machines are on an external usb drive. Performance is fine. You might have some issues with the drive name changing - not an issue if you use virtual machines. |
Granted I work in an industry were Personal Information and Intellectual Property are king, but I don't like that idea at all. That hard drive disappears and you have a big problem.
Why not Remote Desktop into the work machine?
**EDIT** Stipud Spelingg |
I've seen some people having a play with [distributed JUnit][1]. I can't particularly vouch for how effective it is, but the other teams I've seen seemed to think it was straight forward enough. Hope that helps.
[1]: http://216.93.179.140:8080/wiki/display/GG15UG/Distributed+JUnit+Overview |
You could import the CSV file into a table as is, then write an SQL query that does all the required transformations on the imported table and inserts the result into the target table.
So something like:
> <(load the CSV file into temp_table - n, city_name)>
> insert into target_table
> select t.n, c.city_i... |
My understanding is that the connection pooling is automatically handled for you when using the SqlConnection object. This is purposefully designed to work with MSSQL and will ensure connections are pooled efficiently. You just need to be sure you close them when you are finished with them (and ensure they are disposed... |
Fabio,
I've done what Vaibhav has done many times, and it's a good "quick and dirty" way to get data into a database.
If you need to do this a few times, or on some type of schedule, then a more reliable way is to load the CSV data "as-is" into a work table (i.e customer_dataload) and then use standard SQL statem... |
Well, it is going to go away as the answer to all these questions will be LINQ. Incidentally, we have never needed custom connection pooling for any of our applications, so I am not sure what all the noise is about. |
The connection pooling built-in to ADO.Net is robust and mature. I would recommend against attempting to write your own version. |
@BlaM:
Sometimes I justed implemented an active record for a result of a join. Doesn't always have to be the relation Table <--> Active Record. Why not "Result of a Join statement" <--> Active Record ? |
My guess here is that because the data was able to import that the field is actually a varchar or some character field, because importing to a numeric field might have failed. Here was a test case I ran purely a MySQL, SQL solution.
1. The table is just a single column (alpha) that is a varchar.
mysql> ... |
The nested data structure contains a hash *reference*, not a hash.
# Will work (the -> dereferences the reference)
$row = $records[$index];
print "This will work: ", $row->{firstName}, "\n";
# This will also work, by promoting the hash reference into a hash
%row = %{ $records[$index] };
... |
what you actually have in your array is a hashref, not a hash. If you don't understand this concept, its probably worth reading the [perlref][1] documentation.
to get the hash you need to do
my %hash = %{@records[$index]};
Eg.
my @records = (
{'id' => 1, 'firstName' => 'Jim'},
... |
**Suggestion:** If you post each of your recommended podcasts as a *separate* answer then people can vote for your "answer".
BTW, Joel discussed this on the SO Podcast (can't find the reference in the Transcript wiki) and suggested something like:
- Post your suggested "favorite" (tech podcast, in this case) as a ... |
Nice question although to avoid distractions about _right_ and _wrong_ I'd consider asking for the pros and cons of each approach -- I think that's what you meant by which is better or worse and why. Anyway ....
##The First Approach aka Inheritance
Pros:
* Allows polymorphic behavior.
* Is _initially_ simple an... |
The array of hashes doesn't actually contain hashes, but rather an *references* to a hash.
This line:
%row = $records[$index];
assigns %row with one entry. The key is the *scalar*:
{'id' => 1, 'firstName' => 'Jim'},
Which is a reference to the hash, while the value is blank.
What you really ... |
Best way to deal with RoutingError in Rails 2.1.x? |
How do I start threads in plain C? |
|c|multithreading| |
I have used fork() in C to start another process. How do I start a new thread? |
Have you tried looking at [this][1] page? It has a useful matrix of features and links to elsewhere.
Also [this][2] link, search for:
> C2) How does bash differ from the Korn shell
[1]: http://www.faqs.org/faqs/unix-faq/shell/shell-differences/
[2]: http://www.faqs.org/faqs/unix-faq/shell/bash/ |
Even though DocumentBuilder.parse appears not to mutate the builder it does on the Sun JDK default implementation (based on Apache Xerces). Eccentric design decision. What can you do? I guess use a ThreadLocal:
private static final ThreadLocal<DocumentBuilder> builderLocal =
new ThreadLocal<DocumentBuil... |
I assume when you say 'the unit test calls methodB()', you mean not directly and via methodA().
So, is it possible methodB() is being called elsewhere, by another unit test or methodC() maybe? |
pthreads is a good start, look [here][1]
[1]: https://computing.llnl.gov/tutorials/pthreads/ |
Check out the [pthread][1] (POSIX thread) library.
[1]: https://computing.llnl.gov/tutorials/pthreads/ |
# Shuffle card deck evenly in C++
class Deck {
// each card is 8-bit: 4-bit for suit, 4-bit for value
// suits and values are extracted using bit-magic
char cards[52];
public:
// ...
void shuffle() {
std::random_shuffle(cards, cards + 52);
}
// ...... |
# Shuffle card deck evenly in C++
#include <algorithm>
class Deck {
// each card is 8-bit: 4-bit for suit, 4-bit for value
// suits and values are extracted using bit-magic
char cards[52];
public:
// ...
void shuffle() {
std::random_shuffle(cards, cards + 5... |
I have a huge web app that is having issues with memory leak in IE 6.
Fixing a memory leak in a 5 line code sample that demonstrates the problem is easy.
But if I have a very huge application, where should a start from? |
|internet-explorer-6|memory-leaks| |
Using Lucene to search for email addresses |
|lucene|lucene.net|.net|search| |
I want to use Lucene (in particular, Lucene.NET) to search for email address domains.
E.g. I want to search for "@gmail.com" to find all emails sent to a gmail address.
Running a Lucene query for "*@gmail.com" results in an error, asterisks cannot be at the start of queries. Running a query for "@gmail.com" doesn... |
|.net|search|lucene|lucene.net| |
I want to use Lucene (in particular, Lucene.NET) to search for email address domains.
E.g. I want to search for "@gmail.com" to find all emails sent to a gmail address.
Running a Lucene query for "*@gmail.com" results in an error, asterisks cannot be at the start of queries. Running a query for "@gmail.com" doesn... |
|.net|search|lucene| |
Accessing mp3 Meta-Data with Python |
|python|mp3|metadata| |
What is the best way to retrieve mp3 metadata in python? I've seen a couple frameworks out there, but I'm unsure as to which would be the best to use.... Any ideas? |
|python|mp3|meta-data| |
I'm guessing that the problem is recognizing whether the property is nullable or not. In C# you do this with this code:
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
... but I'm not sure what the equivalent of that last clause is in VB.NET. |
Remove Meta Data from .NET applications? |
|metadata|.net|decompiling| |
Is this possible? Does the .NET framework depend on the meta data in the bytecode? I'd like to have an application i write not work in reflector or a similar .NET decompiler.
Any help would be super :D |
|.net|metadata|decompiling| |
|.net|decompiling|meta-data| |
Migrating from MySQL to PostgreSQL |
|mysql|postgresql|migrating|database| |
We are currently using MySQL for a product we are building, and are keen to move to PostgreSQL as soon as possible, primarily for licensing reasons.
Has anyone else done such a move? Our database is the lifeblood of the application and will eventually be storing TBs of data, so I'm keen to hear about experiences of ... |
|ruby|ruby-on-rails|routes| |
So. I'm playing with the routing.rb code in Rails 2.1, and trying to to get it to the point where I can do something useful with the RoutingError exception that is thrown when it can't find the appropriate path.
This is a somewhat tricky problem, because there are some class of URLs which are just plain BAD: the /a... |
Append the following RewriteCond:
RewriteCond %{HTTP:Host} ^[^.]\.[a-z]{2,5}$ [NC]
That way it'll only apply the rule to nondottedsomething.uptofiveletters as you can see, subdomain.domain.com will not match the condition and thus will not be rewritten.
You can change [a-z]{2,5} for a stricter tld matching... |
Append the following RewriteCond:
RewriteCond %{HTTP:Host} ^[^.]+\.[a-z]{2,5}$ [NC]
That way it'll only apply the rule to nondottedsomething.uptofiveletters as you can see, subdomain.domain.com will not match the condition and thus will not be rewritten.
You can change [a-z]{2,5} for a stricter tld matchin... |
You should throw an IllegalArgumentException, as it will make it obvious to the programmer that he has done something invalid. Developers are so used to seeing NPE thrown by the VM, that any programmer would not immediately realize his error, and would start looking around randomly, or worse, blame your code for being... |
If you use the `curses` package, you have much greater control of the console. It also comes at a higher cost in code complexity and is probably unnecessary unless you are developing a large console-based app.
For a simple solution, you can always put the spinning wheel at the end of the status messge (the sequence... |
Regarding your question (in your comment to Ash's response) about the StringBuilder in ASP.NET Ajax the experts seem to disagree on this one.
Christian Wenz says in his book *Programming ASP.NET AJAX* (O'Reilly) that "this approach does not have any measurable effect on memory (in fact, the implementation seems to b... |