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  • Difference between SET autocommit=1 and START TRANSACTION in mysql (Have I missed something?)

    - by tkolar
    Hey there, I am reading up on transactions in mysql and am not sure whether I have grasped something specific correctly, and I want to be sure I understood that correctly, so here goes. I know what a transaction is supposed to do, I'm just not sure whether I understood the statement semantics or not. So, my question is, is anything wrong, (and, if that is the case, what is wrong) with the following: By default, autocommit mode is enabled in mysql. Now, SET autocommit=0; will begin a transaction, SET autocommit=1; will implicitly commit. It is possible to COMMIT; as well as ROLLBACK;, in both of which cases autocommit is still set to 0 afterwards (and a new transaction is implicitly started). START TRANSACTION; will basically SET autocommit=0; until a COMMIT; or ROLLBACK; takes place. In other words, START TRANSACTION; and SET autocommit=0; are equivalent, except for the fact that START TRANSACTION; does the equivalent of implicitly adding a SET autocommit=0; after COMMIT; or ROLLBACK; If that is the case, I don't understand http://dev.mysql.com/doc/refman/5.5/en/set-transaction.html#isolevel_serializable - seeing as having an isolation level implies that there is a transaction, meaning that autocommit should be off anyway? And if there is another difference (other than the one described above) between beginning a transaction and setting autocommit, what is it? Thanks a lot in advance for your help!

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  • JQuery ajax success help

    - by Jason
    Hi all, I am implementing a "Quick delete" function into a page I am creating. The way it works is like this: 1: You click the "delete" button in the table row for the record that you want to delete. 2: The page sends a request to the ajax page and return a successfully message of "yes" or a failure message of "no". My issue is that if I get a successful message of "yes" I want to hide the row for that record. I am having issue "finding" the row using JQuery. Here is my jquery code: $(document).ready(function(){ $(".pane .btn-delete").click(function(){ var element = $(this); var del_id = element.attr("id"); var dataString = 'action=del&cid=' + del_id; if(confirm("Are you sure you want to delete this content block?")) { $("#msgbox").addClass('ajaxmsg').text('Checking permissions....').fadeIn(1000); $.ajax({ type: "get", url: "ajax/admArticles_ajax.php", data: dataString, success: function(data){ switch(data) { case "yes": $("#msgbox").addClass('ajaxmsg').text('Deleting content block....').fadeIn(1000); $(this).parents(".pane").animate({ backgroundColor: "#fbc7c7" }, "fast") .animate({ opacity: "hide" }, "slow") break case "no": $("#msgbox").removeClass().addClass('error').text('You do not have the correct permissions to delete this content....').fadeIn(1000); break default: }; } }); } return false; }); }); This is the lines of code I am using to hide the row however it is not working because I don't think $(this).parents(".pane") finds the element. $(this).parents(".pane").animate({ backgroundColor: "#fbc7c7" }, "fast") .animate({ opacity: "hide" }, "slow") Any help would be greatly appreciated. Thanks...

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  • Are there any scripts to synchronize sites?

    - by Matrym
    I've just set up a fail-over DNS to switch the site to a second host if the first is down. This is great for showing an old / archived version of the site, but I suspect maintenance is going to be a real pain. I moved the files over with rsync in the first place. Is this the kinda thing that could be run as a cron job, automatically moving over newer files?

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  • Misaligned Pointer Performance

    - by Elite Mx
    Aren't misaligned pointers (in the BEST possible case) supposed to slow down performance and in the worst case crash your program (assuming the compiler was nice enough to compile your invalid c program). Well, the following code doesn't seem to have any performance differences between the aligned and misaligned versions. Why is that? /* brutality.c */ #ifdef BRUTALITY xs = (unsigned long *) ((unsigned char *) xs + 1); #endif ... /* main.c */ #include <stdio.h> #include <stdlib.h> #define size_t_max ((size_t)-1) #define max_count(var) (size_t_max / (sizeof var)) int main(int argc, char *argv[]) { unsigned long sum, *xs, *itr, *xs_end; size_t element_count = max_count(*xs) >> 4; xs = malloc(element_count * (sizeof *xs)); if(!xs) exit(1); xs_end = xs + element_count - 1; sum = 0; for(itr = xs; itr < xs_end; itr++) *itr = 0; #include "brutality.c" itr = xs; while(itr < xs_end) sum += *itr++; printf("%lu\n", sum); /* we could free the malloc-ed memory here */ /* but we are almost done */ exit(0); } Compiled and tested on two separate machines using gcc -pedantic -Wall -O0 -std=c99 main.c for i in {0..9}; do time ./a.out; done

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  • Is an Object the smallest pageable unit in the Heap?

    - by DonnieKun
    Hi, If I have a 2 GB ram and I have an 2 instances of an Object which is 1.5 GB each, the operating system will help and context switch the pages to and from harddisk. What if I have 1 instances but is 3 GB. Can the same paging method breakdown this instances into 2 pages? Or will I encounter out-of-memory issue? Thanks.

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  • Error Expected Loop VBScript

    - by Yoko21
    I have a script that opens up an excel file if the password provided is correct. If its wrong, it prompts a message. It works perfectly when I add a loop at the end. However, the problem is whenever the password is wrong the script won't stop asking for the password because of the loop. What I want is the script to quit/close if the password is wrong. I tried to remove the loop and replaced it with "wscript.quit" but it always prompts the message "expected loop". Here is the code I made. password = "pass" do ask=inputbox ("Please enter password:","DProject") select case ask case password answer=true Set xl = CreateObject("Excel.application") xl.Application.Workbooks.Open "C:\Users\test1\Desktop\test.xlsx" xl.Application.Visible = True Set xl = Nothing wscript.quit end select answer=false x=msgbox("Password incorrect... Aborting") loop until answer=true Is it possible to put a message like that counts when aborting. like "Aborting in 3.... 2... 1".

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  • Does anybody know of a USB Postage Scale that's Linux compatible?

    - by Nick
    I'm looking for a postage scale that already has linux support (drivers, etc) for a shipping system that I'm working on. I'm planning to use Ubuntu 9.04, but I am willing to switch distro's for compatibility. Does anybody know of any scales that currently work? Is there an open source project that's working on scale drivers or similar? Thanks!

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  • Looking for a specific python gui module to perform the following task

    - by Sadaf Amouz
    I am looking for a GUI python module that is best suited for the following job: I am trying to plot a graph with many columns (perhaps hundreds), each column representing an individual. The user should be able to drag the columns around and drop them onto different columns to switch the two. Also, there are going to be additional dots drawn on the columns and by hovering over those dots, the user should see the values corresponding to those dots. What is the best way to approach this?

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  • GNU Emacs: skeleton-mode, is it still used ?

    - by xma
    Hi, given all the possible solutions to have a template system with GNU Emacs, what do people use today ? I am still using skeleton-mode but as I read it here and there, we must be really few to do so. What are you using and why ? (maybe I could switch to a more popular tool). Cheers

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  • OpenGL multiple threads, variable handling [closed]

    - by toeplitz
    I have written an OpenGL program which runs in the following way: Main: - Initialize SDL - Create thread which has the OpenGL context: - Renderloop - Set camera (view) matrix with glUniform. - glDrawElements() .... etc. - Swapbuffers(); - Main SDL loop handling input events and such. - Update camera matrix of type glm::mat4. This is how I pass my camera object to the class that handles opengl. Camera *cam = new Camera(); gl.setCam(cam); where void setCam(Camera *camera) { this->camera = camera; } For rendering in the opengl context thread, this happens: glm::mat4 modelView = camera->view * model; glUniformMatrix4fv(shader->bindUniform("modelView"), 1, GL_FALSE, glm::value_ptr(modelView)); In the main program where my SDL and other things are handles I then recompute the view matrix. This his working fine without me using any mutex locks. Is this correct? On the other hand, I add objects to my scene by an "upload queue" and in this case I have to mutex lock my upload queue vector (vector class type) when adding items to it or else the program crashes. In summary: I recompute my matrix in a different thread and then use it in the opengl thread without any mutex lock. Why is this working? Edit: I think my question is similar to what was asked here: Should I lock a variable in one thread if I only need it's value in other threads, and why does it work if I don't?, only in my case it is even more simple with only one matrix being changed.

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  • [Android] Is disabling landscape mode unforgivable?

    - by Nicolas Raoul
    Our application could support landscape mode without any problem, but it is such a pain that we are thinking about forcing portrait mode. Question: Is it BAD? The main problem is that changing orientation generates random crashes on many screens. Avoiding those crashes would potentially allow us to spend more time on the core aspects of the app. Will the same crashes happen when users switch apps anyway? Also, are there landscape-oriented devices where our app will become useless?

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  • How Can I Create A Featured Content Area?

    - by ThatMacLad
    I'm working on a blog and I'd love to create a homepage with a featured post image area. I'd like it to switch between 2-3 of the latest posts images. I was wondering how I would go about doing this but so that I also have a form to update it rather than constantly editing my code.

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  • SQL Server Redirection

    - by MrTehee
    We are switching from a SQL cluster to a mirrored solution. The problem is that we have a bunch of programs that would have to switch connection strings to handle the failover. Is there any way the we can set up a redirect or proxy that would take any legacy requests and forward them to the mirrored solution?

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  • Load image blurred Android

    - by Mira
    I'm trying to create a map for a game through an image, where each black pixel is equivalent to a wall, and yellow to flowers(1) and green grass(0) so far i had this image (50x50): http://i.imgur.com/Ydj9Cp2.png the problem here seems to be that, when i read the image on my code, it get's scaled up to 100x100, even tough i have it on the raw folder. I can't let it scale up or down because that will put noise and blur on the image and then the map won't be readable. here i have my code: (...) Bitmap tab=BitmapFactory.decodeResource(resources, com.example.lolitos2.R.raw.mappixel); //tab=Bitmap.createScaledBitmap(tab, 50, 50, false); Log.e("w", tab.getWidth()+"."+tab.getHeight()); for (int i = 0; i < tab.getWidth(); i++) { for (int j = 0; j < tab.getHeight(); j++) { int x = j; int y = i; switch (tab.getPixel(x, y)) { // se o é uma parede case Color.BLACK: getParedes()[x][y] = new Parede(x, y); break; case Color.GREEN: fundo.add(new Passivo(x,y,0)); break; default: fundo.add(new Passivo(x,y,1)); } } } How can i read my image Map without rescaling it?

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  • Runtime of optimized Primehunter

    - by Setton
    Ok so I need some serious runtime help here! This method should take in an int value, check its primality, and return true if the number is indeed a prime. I understand why the loop only needs to go up to i squared, I understand that the worst case scenario is the case in which either the number is prime (or a multiple of a prime). But I don't understand how to quantify the actual runtime. I have done the loop myself by hand to try to understand the pattern or correlation of the number (n) and how many loops occur, but I literally feel like I keep falling into the same trap every time. I need a new way of thinking about this! I have a hint: "Think about the SIZE of the integer" which makes me want to quantify the literal number of integers in a number in relation to how many iterations it does in the for loop (floor log(n)) +1). BUT IT'S NOT WORKIIIING?! I KNOW it isn't square root n, obviously. I'm asking for Big O notation. public class PrimeHunter { public static boolean isPrime(int n) { boolean answer = (n > 1) ? true : false; //runtime = linear runtime for (int i = 2; i * i <= n; i++) //runtime = ????? { if (n % i == 0) //doesn't occur if it is a prime { answer = false; break; } } return answer; //runtime = linear runtime } }

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  • How to add an extra language input to Android?

    - by bgever
    Is it possible to add extra languages to Android? My current Android phone only supports English and Chinese language input. I would like to have Dutch also, as I can use it for word completion. The question on top of that is, how to switch easily between these languages in the text input (keyboard) GUI?

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  • Regular expression - stop at first match

    - by publicRavi
    My pattern looks something like <xxxx location="file path/level1/level2" xxxx some="xxx"> I am only interested in the part in quotes assigned to location. Shouldn't it be as easy as below without the greedy switch? Does not seem to work :( /.*location="(.*)".*/

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