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  • Can I use anything other than BIGINT as Primary Key data type in SQLite?

    - by weenet
    I was psyched about the possibility of using SQLite as a database solution during development so that I could focus on writing the code first and dynamically generating the db at runtime using NHibernate's ShemaExport functionality. However, I'm running into a few issues, not the least of which is that it seems that SQLite requires me to use Int64 for my primary keys (vs, say, Int32 or Guid). Is there any way around this?

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  • I have data about deadlocks, but I can't understand why they occur (MS SQL/ASP.NET MVC)

    - by Alex
    I am receiving a lot of deadlocks in my big web application. http://stackoverflow.com/questions/2941233/how-to-automatically-re-run-deadlocked-transaction-asp-net-mvc-sql-server Here I wanted to re-run deadlocked transactions, but I was told to get rid of the deadlocks - it's much better, than trying to catch the deadlocks. So I spent the whole day with SQL profiler, setting the tracing keys etc. And this is what I got. There's a Users table. I have a very high usable page with the following query (it's not the only query, but it's the one that causes troubles) UPDATE Users SET views = views + 1 WHERE ID IN (SELECT AuthorID FROM Articles WHERE ArticleID = @ArticleID) And then there's the following query in ALL pages: User = DB.Users.SingleOrDefault(u => u.Password == password && u.Name == username); That's where I get User from cookies. Very often a deadlock occurs and this second LINQ TO SQL query is chosen as a victim, so it's not run, and users of my site see an error screen. I read a lot about deadlocks... And I don't understand why this is causing a deadlock. So obviously both of this queries run very often. At least once a second. Maybe even more often (300-400 users online). So they can be run at the same time very easily, but why does it cause a deadlock? Please help. Thank you

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  • SQL Server Text type v.s. varchar data type

    - by George2
    Hello everyone, I have variable length character and want to store in SQL Server (2005) database. I want to learn some best practices about how to choose TEXT SQL type or choose VARCHAR SQL type, pros and cons in performance/footprint/function. thanks in advance, George

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  • Storing large json strings to database + hash

    - by Guy
    I need to store quiete large JSON data strings to the database. I am using gzip to compress the string and therefore BLOB MySQL data type to store it. However, only 5% of all the requests contain unique data and only unique data ought to be stored to the database. My approach is as follows. array_multisort data (array [a, b, c] is virtually the same as [a, c, b]). json_encode data (json_encode is faster than serialize; we need string array representation for the step 3). sha1 data (slower than md5, though less possible the collisions). Check if the hash exists in the database. 5.1 yes – do not insert the data. 5.2. no – gzip the data and store it along the hash. Is there anything about this (apart from storing JSON data to the database in the first place) that sounds fishy or should be done a different way? p.s. We are talking about a database with roughly 1kk unique records being created every month.

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  • If cookie found, get data, else create cookie, is this good logic?

    - by Ryan
    I have an Action that basically adds an item to a cart, the only way the cart is known is by checking the cookie, here is the flow of logic, please let me know if you see any issue... /order/add/[id] is called via GET action checks for cookie, if no cookie found, it makes a new cart, writes the identifier to the cookie, and adds the item to the database with a relation to the cart created if cookie is found, it gets the cart identifier from the cookie, gets the cart object, adds the item to the database with a relation to the cart found so it's basically like... action add(int id){ if(cookie is there) cart = getcart(cookievalue) else cart = makecart() createcookie(cart.id) additemtocart(cart.id, id) return "success"; } Seem right? I can't really thing of another way that would make sense.

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  • What data (if any) persists across web-requests in Ruby on Rails?

    - by Daniel Beardsley
    I decided to use the singleton design pattern while creating a view helper class. This got me thinking; will the singleton instance survive across requests? This led to another question, Which variables (if any) survive across web requests and does that change depending on deployment? (Fastcgi, Mongrel, Passenger, ...) I know that Controller instance variables aren't persisted. I know Constants are persisted (or reloaded?). But I don't know about class variables, instance variables on a class, Eigenclasses, ...

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  • Extracting data from a text file to use in a python script?

    - by Rob
    Basically, I have a file like this: Url/Host: www.example.com Login: user Password: password How can I use RegEx to separate the details to place them into variables? Sorry if this is a terrible question, I can just never grasp RegEx. So another question would be, can you provide the RegEx, but kind of explain what each part of it is for?

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  • Using Jquery 1.8.0 return false is not breaking an each() loop

    - by user1879729
    Here is the script I am using. $('.row').each(function(){ $(this).each(function(){ if($(this).find('.name').val()==""){ $(this).find('.name').val(data.name); $(this).find('.autonomy').val(data.autonomy); $(this).find('.purpose').val(data.purpose); $(this).find('.flow').val(data.flow); $(this).find('.relatedness').val(data.relatedness); $(this).find('.challenge').val(data.challenge); $(this).find('.mastery').val(data.mastery); $(this).find('.colour').val(data.colour); done=true; } if(done==true){ alert("here"); return false; } }); }); It just seems to totally ignore the return false and I can't seem to work out why!

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  • Unsure how i load the right data into a tableview, chosen from a previous tableview.

    - by Bob
    I currently have two TableViewControllers. The first has seven objects, each day-name listed. Weekdays *mandag = [[Weekdays alloc] initWithName:@"Mandag" daylist:mondayArray]; Weekdays *tirsdag = [[Weekdays alloc] initWithName:@"Tirsdag" daylist:tuesdayArray]; Weekdays *onsdag = [[Weekdays alloc] initWithName:@"Onsdag" daylist:wedensdayArray]; Weekdays *torsdag = [[Weekdays alloc] initWithName:@"Torsdag" daylist:thursdayArray]; Weekdays *fredag = [[Weekdays alloc] initWithName:@"Fredag" daylist:fridayArray]; Weekdays *lordag = [[Weekdays alloc] initWithName:@"Lørdag" daylist:saturdayArray]; Weekdays *sondag = [[Weekdays alloc] initWithName:@"Søndag" daylist:sundayArray]; daylist being a NSMutableArray. The idea is: The name of the day is displayed on table-1. And the array (daylist) of each day is displayed on table-2 - when tabbed one a day. The first table, displaying the names is working fine: VisueltSkemaAppDelegate *appDelegate = (VisueltSkemaAppDelegate *)[[UIApplication sharedApplication] delegate]; Weekdays *ugeDag = (Weekdays *)[appDelegate.ugeDage objectAtIndex:indexPath.row]; cell.textLabel.text = ugeDag.name; return cell; However i thought i could do the same, for the second table - but i have been strugling with it for hours now. This is what i got: VisueltSkemaAppDelegate *appDelegate = (VisueltSkemaAppDelegate *)[[UIApplication sharedApplication] delegate]; Weekdays *ugeDag = (Weekdays *)[appDelegate.ugeDage objectAtIndex:indexPath.row]; cell.textLabel.text = [ugeDag.daylist objectAtIndex:indexPath.row]; return cell; Abit more of the code: http://pastebin.com/iW5AAJXt

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  • Google App Engine query data store by a string start with ...

    - by Frank
    How to write a query that can find me all item_number start with a certain value ? For instance there are item_numbers like these : 123_abc 123_xyz ierireire 321_add 999_pop My current query looks like this : "select from "+PayPal_Message.class.getName()+" where item_number == '"+Item_Number+"' order by item_number desc" What's a query look like that can return all item_numbers start with "123_" ?

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  • If you use XML Serialization how do you validate data?

    - by chobo2
    Hi I am planning to try to use XML Serialization in C# but I am wondering if I get a .xml file how do I check if the xml file confirms to the right type? Like usually you would make a schema that you can validate against to make sure if it confirms to the right format. Can you hook a schema up to to XML Serialization or does it do this checking automatically? Thanks

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  • ajax form handling an array

    - by moata_u
    am trying to handle an array comes from php file after submitting the form data , the value of data after submitting the form is = ARRAY but i cant use this array in any way , any idea how can i handle this array !!!! Javascript : $('#file').live('change',function(){ $('#preview').html(''); $('#preview').html('<img src="loader.gif" />'); $('#data').ajaxForm(function(data){ $(data['toshow']).insertBefore('.pic_content').hide().fadeIn(1000); }).submit(); }); PHP : .... ....etc echo json_encode(array('toshow'=>somedata,'data'=>somedata)); data come from php file {"toshow":"\r\n\t\t\t\t\r\n\t\t<table class=\"out\">\r\n\t\t\t<tr ><td class=\"img\"><a title=\"2012-06-02 01-22-09\" rel=\"prettyPhoto\" href=\"img\/2012-06-02 01-22-09.284.jpg\"><img src=\"img\/thumb\/2012-06-02 01-22-09.284.jpg\"\/><\/a><\/td><\/tr>\r\n\t\t\t\r\n\t\t\t<td>\r\n\t\t\t\t<table cellSpacing=\"1\" cellPadding=\"0\">\r\n\t\t\t\t\t<tr><td class=\"data\"><span class=\"click\">2012-06-02 01-22-09<\/span><\/td><\/tr>\r\n\t\t\t\t\t<tr><td class=\"data\"><span class=\"click\">Download<\/span><\/td><\/tr>\r\n\t\t\t\t\t<tr><td class=\"data\"><a href=\"img\/2012-06-02 01-22-09.284.jpg\"><span class=\"click\">View<\/span><\/a><\/td><\/tr>\r\n\t\t\t\t<\/table>\r\n\t\t\t<\/td>\r\n\t\t\t<\/tr>\r\n\t\t<\/table>","span":"<span class='text'><img src='greencheck.png'\/>2012-06-02 01-22-09 Uploaded ,File Size =152Kb <\/span>"}

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