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  • MySQL Check if table exists error

    - by Max van Heiningen
    I'm trying to check if a table already exists, however I can't get this working. IF EXISTS (SELECT 1 FROM sysobjects WHERE xtype='u' AND name='tablename') SELECT 'table already exists.' ELSE BEGIN CREATE TABLE Week_( id INT(10)AUTO_INCREMENT PRIMARY KEY (id), ... ...) END; My error: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IF EXISTS (SELECT 1 FROM sysobjects WHERE xtype='u' AND name' at line 1 Can someone help me with this? Thanks in advance

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  • Choosing sound codec for network (c/c++)

    - by ergey
    Hi, I'am imnplementing real-time sound (voice) recording and transferring to another point in my application. I would ask who knows good codec or compression algorithm to transfer low-quality (max 32 kbit) sound data through the network. I know skype uses good compression, what codec use it? Thank you.

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  • Where to read the provided height value in an UITableViewCell?

    - by mystify
    I made a UITableViewCell subclass, and now I want that subclass to be "clever". It should align it's contents to the height of the row. But for this, the cell must know what height value was provided for it in this method: - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath However, no matter what value I assign here, my cell's frame is 44 px height at initialization time (default style). Is there any way I can get that value from the cell at initialization time?

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  • Is there memory usage profiler available?

    - by prosseek
    For time profiler for XYZ, I can just run 'time XYZ', or if I have the source code in C/C++, I even can use gprof to get profiled results. Is there any similar tool for memory usage? Is there any tool I can use something like 'memory XYZ', to get info such as min/max/median memory usage? What tool do you use for memory profile with C++/Objective C/C#/Java?

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  • adding a click event to fullcalendar

    - by sbekele
    How can I add a click event on the event and pass the day and event time as url variable to another page. Like when user click in the event I want to pass the date and event time to another page for processing. Any idea are welcome. Thanks

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  • Intermittent 403 errors when using allow to limit access to url with both explicit IP and SetEnvIf

    - by rbieber
    We are running Apache 2.2.22 on a Solaris 10 environment. We have a specific URL that we want to limit access to by IP. We recently implemented a CDN and now have the added complexity that the IP's that a request are shown to be coming from are actually the CDN servers and not the ultimate end user. In the case that we need to back the CDN out, we want to handle the case where either the CDN is forwarding the request, or the ultimate client is sending the request directly. The CDN sends the end user IP address in an HTTP header (for this scenario that header is called "User-IP"). Here is the configuration that we have put in place: SetEnvIf User-IP (\d+\.\d+\.\d+\.\d+) REAL_USER_IP=$1 SetEnvIf REAL_USER_IP "(10\.1\.2\.3|192\.168\..+)" access_allowed=1 <Location /uri/> Order deny,allow Allow from 10.1.2.3 192.168. allow from env=access_allowed Deny from all </Location> This seems to work fine for a time, however at some point the web server starts serving 403 errors to the end user - so for some reason it is restricting access. The odd thing is that a bounce of the web server seems to resolve the issue, but only for a time - then the behavior comes back. It might be worthwhile to note as well that this URL is delegated to a JBoss server via mod_jk. The denial of access is, however; confirmed to be at the Apache layer and the issue only seems to happen after the server has been running for some time.

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  • At What point should you understand pointers?

    - by Vaccano
    I asked a question like this in an interview for a entry level programmer: var instance1 = new myObject{Value = "hello"} var instance2 = instance1; instance1.Value = "bye"; Console.WriteLine(instance1.Value); Console.WriteLine(instance2.Value); The applicant responded with "hello", "bye" as the output. Some of my co-workers said that pointers are not that important anymore or that this question is not a real judge of ability. Are they right?

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  • What type of programs are C/C++ used for now?

    - by Ryan Detzel
    I started off with C in school, went to Java and now I primarily use the P's(Php, Perl, Python) so my exposure to the lower level languages have all but disappeared. I would like to get back into it but I can never justify using C over Perl or Python. What real-world apps are being built with these languages? Any suggestions if I want to dive back in, what can I do with C/C++ that I can't easily do with Perl/Python?

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  • Can't figure out what's wrong with my php/sql statement

    - by Olegious
    So this is probably a dumb beginner question, but I've been looking at it and can't figure it out. A bit of background: just practicing making a web app, a form on page 1 takes in some values from the user, posts them to the next page which contains the code to connect to the DB and populate the relevant tables. I establish the DB connection successfully, here's the code that contains the query: $conn->query("SET NAMES 'utf9'"); $query_str = "INSERT INTO 'qa'.'users' ('id', 'user_name','password' ,'email' ,'dob' ,'sx') VALUES (NULL, $username, $password, $email, $dob, $sx);"; $result = @$conn->query($query_str); Here's the error that is returned:Insert query failed: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''qa'.'users' ('id', 'user_name' ,'password' ,'email' ,'dob' ,'s' at line 1 Thanks in advance!

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  • Add jQuery colorbox plugin to a dynamically created element, extra problem.

    - by PapiChuloMX
    I saw the answer of a question: http://stackoverflow.com/questions/2443490/add-jquery-colorbox-plugin-to-a-dynamically-created-element Solve part of the problem, works fine, but when I click for second time, it doesn't work. When I try to click for second time an error displays: $.fn.colorbox is not a function. How can i correct that error and avoid a double click to bind colorbox. I don't speak english, i did my best to write this words, i hope you can read me. Thanks.

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  • Service restarts automatically after it is manually stopped.

    - by Snowill
    I have created a windows service in C#.NET that is continuously running. Now when i stop it from the services.msc initially it shows that it has been stopped but after some time when i refresh the services.msc it shows as started again. I also checked in the task manager at the same time, i see that the exe of my application gets killed but starts on its own again. Please help.

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  • How to find text in images with the browser control+F

    - by Riga
    Have HTML pages with many sections and each section has a section title displayed as an image (to use nice font). The problem is that even if I specify an 'alt' and 'title' text on each image/title the Ctrl+F browser functionality does not find the text. Thought two possible solutions but not very happy about them 1) Use embed fonts. Problem: Can not find the font required by client to use and not sure about copyrights. 2) Have the text in the image in DIV near the image but hidden from user view. Problem: Can search engines consider this keyword stuffing? Will browser find text if display:none Does anybody has a better solution? Thanks Riga

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  • Minimizing distance to a weighted grid

    - by Andrew Tomazos - Fathomling
    Lets suppose you have a 1000x1000 grid of positive integer weights W. We want to find the cell that minimizes the average weighted distance.to each cell. The brute force way to do this would be to loop over each candidate cell and calculate the distance: int best_x, best_y, best_dist; for x0 = 1:1000, for y0 = 1:1000, int total_dist = 0; for x1 = 1:1000, for y1 = 1:1000, total_dist += W[x1,y1] * sqrt((x0-x1)^2 + (y0-y1)^2); if (total_dist < best_dist) best_x = x0; best_y = y0; best_dist = total_dist; This takes ~10^12 operations, which is too long. Is there a way to do this in or near ~10^8 or so operations?

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  • Can a problem have a relation of aggregation and composition both between two classes at same point

    - by learner
    Can a problem have a relation of aggregation and composition both between two classes at same point of time? Like any real time scenario where there can be aggregation corresponding to one method and composition related to other method. I m unable to figure out any scenario where both composition and aggregation occurs simultaneously between two classes. Any help will be appreciable.

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  • Javascript jQuery ajax submit default data

    - by onlineracoon
    How to submit default data when using $.ajax? I have tried: $.ajaxPrefilter(function(options, originalOptions, jqXHR) { // can't access anything here... (tried jqXHR.data but undefined) }); $.ajaxSetup({ beforeSend: function(jqXHR, settings) { // can't access anything here... (tried jqXHR.data but undefined) } }); I need this so I can send my CSRF token, each time and when logged in submit the user ID each time. I prefer not to submit a token in headers. 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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  • See queries that hit SQL

    - by Shaded
    I have a really basic stupid easy question about sql... and I'll probably get -100 points... but here it goes anyway... Is there a way using sql 2008 Management Studio to look at the queries that hit the server? I'm trying to debug a program and I get messages like "Incorrect syntax near the keyword 'AND'". Since the queries are being dynamically generated it's a hassle to figure out what is going to the server. Any help is appreciated!

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