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  • internal implementation of database Queries

    - by harigm
    In my experience I have used many queries like select, order by, where clause etc.. in mysql, sql-server, oracle etc For a moment i have thought, 1)how is this internally written to implement the above queries 2) which language do they use? 3) is that programming language? if yes which language? 4)what kind of environment required to implement this kind of complex database

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  • Pull row of data from one place in spreadsheet to another

    - by bookcasey
    I have a list of names and their assorted properties. I am trying to find a way to quickly move an entire row's worth of data into a different sheet so I can manipulate it. Currently I can accomplish this by copy and pasting the entire row, but this is not elegant nor dynamic (the number in blue does not update with this method): My ideal solution: A name is typed into the "Name" column. The spreadsheet program pulls the associated row from the "main" sheet into the new sheet. I am currently using Numbers.app, but am curious if this is possible in Excel, OpenOffice Calc, Google Docs, or any other spreadsheet program. Thank you.

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  • Why Emacs/Vim/Textmate? Isn't Xcode good enough?

    - by ivanTheTerrible
    Hi I mostly do C++, Objective-C programming. And I found Xcode plus an auto completion/macro plugin (Completion Dictionary) quite adequate. However, all people seem to praise over their pure text editors. I tried Textmate for a bit; liked its simplicity but dislike its files/framework handling. Am I missing something here? Or, do Vim or Emacs have auto-completion as good as Xcode?

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  • dns hierarchy not working !! Please help

    - by nikhilelite
    (DNS1 ,WWW1, Gateway1) (sub-internal network) (DNS0,WWW0,Gateway0) (internal network) DNS1: 192.168.250.3/24 WWW1: 192.168.250.4/24 Gateway1: 192.168.250.1 /24 (internal) :: 192.168.0.150 to 192.168.0.175 (external) DNS0:192.168.0.197/24 WWW0:192.168.0.197/24 Gateway0: 192.168.0.1 (internal) :: 69.94.x.x (external, dynamic ,isp control) Expected behavior: When using dig from internal (192.168.250.0/24) hosts, and query about domain from 192.168.0.197/16 nameserver's hosts (for which its authoritative) , it should return the ip address. Whats happening: After dig, answer section empty, the query is trying to access a.root server instead of 192.168.0.197 ,even though i have defined 192.168.0.197 as dns in gateway1's resolv.conf Why? I need this working asap, can anyone here help ?

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  • Path managment in Linux programs

    - by petersohn
    I have a newbie Linux programming question. Suppose I have a project that uses Autotools for compiling and deployment, and I have data files that are to be installed in a location like /var/something or /usr/share/something etc., but in Autoconf, I can change these installation paths. How should the program find these files? How does it know where they are actually installed (if anywhere, since the program should work even if not installed, but run from where it was built)?

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  • Objects With No Behavior

    - by Patrick Donovan
    I've been teaching myself object oriented programming and I'm thinking about a situation where I have an object "Transaction", that has quite a few properties to it like account, amount, date, currency, type, etc. I never plan to mutate these data points, and calculation logic will live in other classes. My question is, is it poor Python design to instantiate thousands of objects just to hold data? I find the data far easier to work with embedded in a class rather than trying to cram it into some combination of data structures.

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  • Is Software Raid1 Using mdadm with a Local Hard Disk and GNDB Possible?

    - by Travis
    I have multiple webservers which use many small files to created dynamic web pages. Caching the web pages isn't an option. The webserver also performs writes so I need a synchronous filesystem. I'm looking to maximise performance as it's my understanding that small files is the weakness (to varying degreess) of a cluster filesystem over ethernet. Currently I'm using Centos 5.5, 64 bit. Since it's only about 300MB of data, I'm looking at mdadm using RAID-1 with the GNBD and a local hard disk using the "--write-mostly" option so the reads are done using the local hard disk. Is this possible? If so, is there any advantage to making it a tmpfs disk instead of a local hard disk? Or will the files on the local hard disk just get cached in RAM anyway so I won't see a performance gain by using tmpfs, assuming there's enough RAM available?

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  • Ubuntu 12.04 host lookups extremely slow

    - by tubaguy50035
    I'm having issues with one of my servers taking a long time to look up host names. This is an Ubuntu 12.04 box, so I've tried following the new resolvconf directives. In my /etc/network/interfaces file, I defined my name servers like this: auto eth0 iface eth0 inet static address someaddress netmask 255.255.255.0 gateway 198.58.103.1 dns-nameservers 74.14.179.5 72.14.188.5 In my /etc/resolv.conf, I see these name servers, like this: # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 74.14.179.5 nameserver 72.14.188.5 On another box, I edited the resolv.conf directly as directed by my hosts' setup help files. It looks like this: domain members.linode.com search members.linode.com nameserver 72.14.179.5 nameserver 72.14.188.5 options rotate This second box has no issues with host name look ups and responds quite quickly. Could not having the domain and search directives make my look ups slow? By slow, I mean it's taking anywhere from 5 to 15 seconds to find the IP address of a host.

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  • How do you iterate through each email in your inbox using python?

    - by djblue2009
    I'm completely new to programming and I'm trying to build an autorespoder to send a msg to a specific email address. Using an if statement, I can check if there is an email from a certain address in the inbox and I can send an email, but if there are multiple emails from that address, how can I make a for loop to send an email for every email from that specific address. I tried to do use this as a loop: for M.search(None, 'From', address) in M.select(): but I get the error: "can't assign to function call" on that line

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  • Why don't I just build the whole web app in Javascript and Javascript HTML Templates?

    - by viatropos
    I'm getting to the point on an app where I need to start caching things, and it got me thinking... In some parts of the app, I render table rows (jqGrid, slickgrid, etc.) or fancy div rows (like in the New Twitter) by grabbing pure JSON and running it through something like Mustache, jquery.tmpl, etc. In other parts of the app, I just render the info in pure HTML (server-side HAML templates), and if there's searching/paginating, I just go to a new URL and load a new HTML page. Now the problem is in caching and maintainability. On one hand I'm thinking, if everything was built using Javascript HTML Templates, then my app would serve just an HTML layout/shell, and a bunch of JSON. If you look at the Facebook and Twitter HTML source, that's basically what they're doing (95% json/javascript, 5% html). This would make it so my app only needed to cache JSON (pages, actions, and/or records). Which means you'd hit the cache no matter if you were some remote api developer accessing a JSON api, or the strait web app. That is, I don't need 2 caches, one for the JSON, one for the HTML. That seems like it'd cut my cache store down in half, and streamline things a little bit. On the other hand, I'm thinking, from what I've seen/experienced, generating static HTML server-side, and caching that, seems to be much better performance wise cross-browser; you get the graphics instantly and don't have to wait that split-second for javascript to render it. StackOverflow seems to do everything in plain HTML, and you can tell... everything appears at once. Notice how though on twitter.com, the page is blank for .5-1 seconds, and the page chunks in: the javascript has to render the json. The downside with this is that, for anything dynamic (like endless scrolling, or grids), I'd have to create javascript templates anyway... so now I have server-side HAML templates, client-side javascript templates, and a lot more to cache. My question is, is there any consensus on how to approach this? What are the benefits and drawbacks from your experience of mixing the two versus going 100% with one over the other? Update: Some reasons that factor into why I haven't yet made the decision to go with 100% javascript templating are: Performance. Haven't formally tested, but from what I've seen, raw html renders faster and more fluidly than javascript-generated html cross-browser. Plus, I'm not sure how mobile devices handle dynamic html performance-wise. Testing. I have a lot of integration tests that work well with static HTML, so switching to javascript-only would require 1) more focused pure-javascript testing (jasmine), and 2) integrating javascript into capybara integration tests. This is just a matter of time and work, but it's probably significant. Maintenance. Getting rid of HAML. I love HAML, it's so easy to write, it prints pretty HTML... It makes code clean, it makes maintenance easy. Going with javascript, there's nothing as concise. SEO. I know google handles the ajax /#!/path, but haven't grasped how this will affect other search engines and how older browsers handle it. Seems like it'd require a significant setup.

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  • dhclient and dhcpcd the real difference

    - by rubixibuc
    I can't figure out the difference from just the man pages. I can see what is a daemon and one is a client, but what does that mean practically when using the commands? Also what is the difference between the client and daemon in this case, not just the terms (client and daemon) but functionally wise? EDIT: How are the tasks divided, if the client updates the information on the client, what is the purpose of the daemon. I'm talking about the client daemon in this case dhcpcd not dhcpd. Both come installed by default with some versions of Linux and seem to share the duties of the dhcp client. NAME dhcpcd - DHCP client daemon Name dhclient - Dynamic Host Configuration Protocol Client

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  • k-combinations of a set of integers in ascending size order

    - by Adamski
    Programming challenge: Given a set of integers [1, 2, 3, 4, 5] I would like to generate all possible k-combinations in ascending size order in Java; e.g. [1], [2], [3], [4], [5], [1, 2], [1, 3] ... [1, 2, 3, 4, 5] It is fairly easy to produce a recursive solution that generates all combinations and then sort them afterwards but I imagine there's a more efficient way that removes the need for the additional sort.

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  • Maintaining a secure database of user logins and info?

    - by Rafe Kettler
    I want to have a login form on a charity website I am building (it's for a friend, and I'm learning on the go), and I want to know what languages/software should I learn to build databases for user logins and info? Note: it HAS to be secure and relatively simple to learn for someone with moderate programming experience. Update: I understand that CMSs offer good tools for logins etc. but I want to do this all by myself.

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  • ssh: which side is running the SOCKS proxy?

    - by Barry Brown
    When I set up a tunnel using dynamic forwarding (ssh -D), which side is running the SOCKS proxy? That is, is the proxy running on the local end (client) or the remote end (server)? Here's the situation: I want to set up several tunnels chained together using -L. Should the -D tunnel be the last one in the chain or the first one? Edit: I found the answer to the second paragraph on Super User (the -D tunnel should be at the remotest end). But I'd still like to know where the proxy code is running.

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  • Connect to CentOS LAMP instance from Windows PCs

    - by Gnanesh
    I have a CentOS 6 machine running on our network which has a simple LAMP installation on it. I have some files there which I would want to access through other Windows PC which I am able to do so using the IP address of the CentOS machine. Since the IP address of the CentOS machine also could be dynamic I would want to connect to it using the computer / host name But I am not able to do so using the computer / host name of the CentOS machine. Can someone help me point out what I may be missing and help me out to resolve this?

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  • How Linux programmers create GUI application without using IDE?

    - by CMW
    Hi, I have read some comments in some forums saying that Linux programmers usually do not use any IDE. They prefer to use Vim and Emacs to do their programming. If I'm not mistaken, Vim and Emacs are just text editors, similar to notepad, but with syntax highlighting. I just want to know how Linux programmers create complicated GUI application without using any IDE. Thanks.

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  • Where are run the Opengl commands?

    - by Lucas
    Hi, i'm programming a simple OpenGL program on a multi-core computer that has a GPU. The GPU is a simple GeForce with PhysX, CUDA and OpenGL 2.1 support. When i run this program, is the host CPU that executes OpenGL specific commands or the ones are directly transferred to the GPU ???

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  • How To Store Files In An EXE C#

    - by S3THST4
    Alright, so I'm working on programming my own installer in C#, and what I'd like to do is something along the lines of put the files in the .exe, so I can do File.Copy(file, filedir); Or, if this isn't possible, is there another way of doing what I am attempting to do? Thank you in advance. ~Seth

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  • iPhone memory management

    - by Prazi
    I am newbie to iPhone programming. I am not using Interface Builder in my programming. I have some doubt about memory management, @property topics in iPhone. Consider the following code @interface LoadFlag : UIViewController { UIImage *flag; UIImageView *preview; } @property (nonatomic, retain) UIImageView *preview; @property (nonatomic, retain) UIImage *flag; @implementation @synthesize preview; @synthesize flag; - (void)viewDidLoad { flag = [UIImage imageNamed:@"myImage.png"]]; NSLog(@"Preview: %d\n",[preview retainCount]); //Count: 0 but shouldn't it be 1 as I am retaining it in @property in interface file preview=[[UIImageView alloc]init]; NSLog(@"Count: %d\n",[preview retainCount]); //Count: 1 preview.frame=CGRectMake(0.0f, 0.0f, 100.0f, 100.0f); preview.image = flag; [self.view addSubview:preview]; NSLog(@"Count: %d\n",[preview retainCount]); //Count: 2 [preview release]; NSLog(@"Count: %d\n",[preview retainCount]); //Count: 1 } When & Why(what is the need) do I have to set @property with retain (in above case for UIImage & UIImageView) ? I saw this statement in many sample programs but didn't understood the need of it. When I declare @property (nonatomic, retain) UIImageView *preview; statement the retain Count is 0. Why doesn't it increase by 1 inspite of retaining it in @property. Also when I declare [self.view addSubview:preview]; then retain Count increments by 1 again. In this case does the "Autorelease pool" releases for us later or we have to take care of releasing it. I am not sure but I think that the Autorelease should handle it as we didn't explicitly retained it so why should we worry of releasing it. Now, after the [preview release]; statement my count is 1. Now I don't need UIImageView anymore in my program so when and where should I release it so that the count becomes 0 and the memory gets deallocated. Again, I am not sure but I think that the Autorelease should handle it as we didn't explicitly retained it so why should we worry of releasing it. What will happen if I release it in -(void) dealloc method In the statement - flag = [UIImage imageNamed:@"myImage.png"]]; I haven't allocated any memory to flag but how can I still use it in my program. In this case if I do not allocate memory then who allocates & deallocates memory to it or is the "flag" just a reference pointing to - [UIImage imageNamed:@"myImage.png"]];. If it is a reference only then do i need to release it. Thanks in advance.

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