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• Need tips for better usability for tabular data with pagination

  - by Anil Namde

  Hi all, Just another day i found myself writing code to show data on the UI. I am again using DataGrid/GridView (ASP.NET), User Id as link button (clickable) to redirect user to another page. User having hard time to find where to click(Though the link has underline and hand pointer as usual on hover) just another common table like structure Following are the columns for example, User ID (Link button), User Name, First Name, Last Name, Date Of Birth Now i would like to make it better form the usability point of view. Can someone suggest a good link, example or suggestions to make it better. Thanks all,

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• Looking for an HQL builder (Hibernate Query Language)

  - by Sébastien RoccaSerra

  I'm looking for a builder for HQL in Java. I want to get rid of things like: StringBuilder builder = new StringBuilder() .append("select stock from ") .append( Stock.class.getName() ) .append( " as stock where stock.id = ") .append( id ); I'd rather have something like: HqlBuilder builder = new HqlBuilder() .select( "stock" ) .from( Stock.class.getName() ).as( "stock" ) .where( "stock.id" ).equals( id ); I googled a bit, and I couldn't find one. I wrote a quick & dumb HqlBuilder that suits my needs for now, but I'd love to find one that has more users and tests than me alone. Note: I'd like to be able to do things like this and more, which I failed to do with the Criteria API: select stock from com.something.Stock as stock, com.something.Bonus as bonus where stock.someValue = bonus.id ie. select all stocks whose property someValue points to any bonus from the Bonus table. Thanks!

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• What makes a bad programming language bad?

  - by sub

  We have all seen things like the typing system of JavaScript (There is a funny post including a truth table somewhere around here). I consider this one of the main things that makes a programming language bad. Other things that spring to mind: Bad Error messages (Either obfuscated so you can't figure out whats wrong, not existing or simply too long and red) The language wasn't planned and just grew uncontrolled in all directions (PHP?) The language encourages bad programm(er/ing) habits such as: Global variables everywhere, bad variable names Inconsistent naming conventions inside the language I can't come up with any more at the moment and would be very happy to read what you think about this. What shouldn't be missing in a language created to be as bad (from the perspectives of the programmer, the company that hires to programmer, the team leader and the customer) as possible? (I ask this because I'm designing a bad, experimental language at the moment)

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• Linq insert statement inserts nothing, does not fail either

  - by pietjepoeier

  I am trying to insert a new account in my Acccounts table with linq. I tried using the EntityModel and Linq2Sql. I get no insert into my database nor an exception of any kind. public static Linq2SQLDataContext dataContext { get { return new Linq2SQLDataContext(); } } try { //EntityModel Accounts acc = Accounts.CreateAccounts(0, Voornaam, Straat, Huisnummer, Stad, Land, 15, EmailReg, Password1); Entities.AddToAccounts(acc); Entities.SaveChanges(); //Linq 2 SQL Account account = new Account { City = Stad, Country = Land, EmailAddress = EmailReg, Name = Voornaam, Password = Password1, Street = Straat, StreetNr = Huisnummer, StreetNrAdd = Toevoeging, Points = 25 }; dataContext.Accounts.InsertOnSubmit(account); var conf = dataContext.ChangeConflicts; // No changeConflicts ChangeSet set = dataContext.GetChangeSet(); // 0 inserts, 0 updates, 0 deletes try { dataContext.SubmitChanges(); } catch (Exception ex) { } } catch (EntityException ex) { }

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• String Field Sizes for unicode database fields using different data access components

  - by Serg

  mjustin in his question 1 and question 2 says that TWideStringField.Size property for UTF8 fields in Delphi 2009 dbExpress is 4 times larger than the logical field size (max number of characters in the field). I inclined to consider this a dbExpress bug. That is what Delphi 2009 Help says: The interpretation of Size depends on the data type. The meaning of Size for data types that use it is given in the following table. For all other data types, Size is not used and its value is always 0. ftString - Size is the maximum number of characters in the string. I am using FibPlus 6.9.9 and it follows the above documentation - the string field size is the maximum number of characters, not bytes. So the question also implies the following question: Are DbExpress drivers in Delphi 2009 unusable for unicode databases?

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• How to get elements from a page using Simple HTML DOM Parser

  - by sm56d

  Hi I am trying to parse a HTML page using the Simple HTML DOM Parser. This HTML page doesn't make use of IDs which makes it harder to refer to elements. On this page I am trying to get the Album name, Song title, download link and the album image. I have done this but I can't even get the Album names! $html = file_get_html('http://music.banadir24.com/singer/aasha_abdoo/247.html'); $article = $html->find('table td[class=title]', 0); foreach($article as $link){ echo $link; } This outputs: 1tdArrayArrayArray Artist Array I need to get this sort of output: Image Path Duniya Jamiila [URL] Macaan Badnoo [URL] Donimaayee [URL] ... Thanks all for any help Please note: This is legal as the songs are not bound by copyright and they are available to download freely, its just I need to download a lot of them and I can't sit there clicking a button all day. Having said that, its taken me an hour to get this far.

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• Most efficient sorting of calculation on DataTable column calculation

  - by byte

  Lets say you have a DataTable that has columns of "id", "cost", "qty": DataTable dt = new DataTable(); dt.Columns.Add("id", typeof(int)); dt.Columns.Add("cost", typeof(double)); dt.Columns.Add("qty", typeof(int)); And it's keyed on "id": dt.PrimaryKey = new DataColumn[1] { dt.Columns["id"] }; Now what we are interested in is the cost per quantity. So, in other words if you had a row of: id | cost | qty ---------------- 42 | 10.00 | 2 The cost per quantity is 5.00. My question then is, given the preceeding table, assume it's constructed with many thousands of rows, and you're interested in the top 3 cost per quantity rows. The information needed is the id, cost per quantity. You cannot use LINQ. In SQL it would be trivial; how BEST (most efficiently) would you accomplish it in C# without LINQ?

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• problem with IBoutlet UITableView connection

  - by ideafactory

  Hi,I'm having a problem with IBoutlet UITableView connection. It seems that the IBOutlet isn't connected to the TaleView. I set the delgate and the datasource to the files owner and set the iboutlet to the tableview in the nib. The tableview is well initialized. I just want to do some reloadData and it's not working. I try to do some deselectRow just to see if it isn't reloadData problem but it doesn't deselect so i assume that the iboutlet isn't associated with my tableview. This table view is in a viewcontroller that is called as a modalViewController. Here is some code: My .h file: @interface AddEditProjectsViewController : UIViewController <UITableViewDelegate, UITableViewDataSource, UIActionSheetDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITextViewDelegate, UIAlertViewDelegate>{ IBOutlet UITableView *addEditProjectTable; } @property (nonatomic, retain) IBOutlet UITableView *addEditProjectTable; @end My .m file: - (void)viewWillAppear:(BOOL)animated { (...) [addEditProjectTable reloadData]; [super viewWillAppear:animated]; Thanks for any help! :)

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• Dice face value recognition

  - by Jakob Gade

  I’m trying to build a simple application that will recognize the values of two 6-sided dice. I’m looking for some general pointers, or maybe even an open source project. The two dice will be black and white, with white and black pips respectively. Their distance to the camera will always be the same, but their position on the playing surface will be random. (not the best example, the surface will be a different color and the shadows will be gone) I have no prior experience with developing this kind of recognition software, but I would assume the trick is to first isolate the faces by searching for the square profile with a dominating white or black color (the rest of the image, i.e. the table/playing surface, will in distinctly different colors), and then isolate the pips for the count. Shadows will be eliminated by top down lighting. I’m hoping the described scenario is so simple (read: common) it may even be used as an “introductory exercise” for developers working on OCR technologies or similar computer vision challenges.

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• Use ASP.Net server control code generation from .ashx

  - by Matt Dawdy

  I'm trying to take an existing bunch of code that was previously on a full .aspx page, and do the same stuff in a .ashx handler. The code created an HtmlTable object, added rows and cells to those rows, then added that html table the .aspx's controls collection, then added it to a div that was already on the page. I am trying to keep the code in tact but instead of putting the control into a div, actually generate the html and I'll return that in a big chunk of text that can be called via AJAX client-side. HtmlTable errors out when I try to use the InnerHtml property (says it isn't supported), and when I try RenderControl, after making first a TextWriter and next an HtmlTextWriter object, I get the error that Page cannot be null. Has anyone done this before? Any suggestions?

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• visual studio 2010 database project, is there a visual way?

  - by b0x0rz

  started a visual studio 2010 database project. however i am only able to write sql in a text mode, there is no functionality in making the table for example in a visual view as exists when you add a new database to app_data folder and the work on it there. is this the only way and there is no visual way of doing this in the visual studio 2010 database project? or am i missing some obvious way of getting to it? thank you also if there is a tutorial anywhere (video maybe!?) please link it. i only found importing a database from an existing script video using a wizard. would like new database from scratch without wizard.

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• Entity Framework mant to many insert

  - by Jacob

  I've been playing around with Entity Framework v2 and added some code to insert new entity with many to many relationship , lets say this entity is called meeting. I add hours to meeting : meeting.Hours.Add(hour); and I get different errors on different occasions On Update : Cannot insert the value NULL into column 'Meetings_Id', table 'Plan.dbo.MeetingHour'; column does not allow nulls. INSERT fails. The statement has been terminated. On Inset : An item with the same key has already been added. But the tricky party is that if I add this manually trough SQL Server Management Studio , I can update the entity with the same value , clearing it first (meeting.Hour.Clear()) Can't see what could be the problem , maybe entity model isn't mapped correctly ?

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• using PHP to create multidimensional array from simple JSON array

  - by Michael Robinson

  I have a php query the returns the following JSON format from a table. [{"memberid":"18", "useridFK":"30", "loginName":"Johnson", "name":"Frank", "age":"23", "place":"School", }, It needs the following format: [{"memberid":"18" { "useridFK":"30", "loginName":"Johnson", "name":"Frank", "age":"23", "place":"School",} }, I was told in another question that PHP would work and it looks like "Transversing" might be appropriate, I'm looking to find out what to put in the Php before it returns the JASON. My Array.plist will look like the following: Root: Dictionary V Rows: Array V Item 0: Dictionary Title: String 18 V Children Array V Item 0 Dictionary Title String 30 etc. Thanks in advance.

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• Pylons 1.0 AttributeError: 'module' object has no attribute 'metadata'

  - by shiki

  Python noob trying to learn Pylons. I'm using the QuickWiki tutorial (http://pylonshq.com/docs/en/1.0/tutorials/quickwiki_tutorial/) from the 1.0 documentation, but this alleged "1.0" doc seems to just be "0.9.7"; I suspect that this has something to do with the error I'm getting. When I execute "paster setup-app development.ini", I get this: (mydevenv)lucid@lucid-laptop:~/QuickWiki$ paster setup-app development.ini Traceback (most recent call last): ... edited for brevity... File "/home/lucid/mydevenv/lib/python2.6/site-packages/setuptools-0.6c11-py2.6.egg/pkg_resources.py", line 1954, in load File "/home/lucid/QuickWiki/quickwiki/config/middleware.py", line 11, in <module> from quickwiki.config.environment import load_environment File "/home/lucid/QuickWiki/quickwiki/config/environment.py", line 12, in <module> from quickwiki.model import init_model File "/home/lucid/QuickWiki/quickwiki/model/__init__.py", line 27, in <module> pages_table = sa.Table('pages', meta.metadata, AttributeError: 'module' object has no attribute 'metadata' (mydevenv)lucid@lucid-laptop:~/QuickWiki$

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• VBA ODBC Update

  - by Soo

  This is the code I'm using to update an SQL database: Public Sub main() Dim cnn As ADODB.Connection Dim rst As ADODB.Recordset Set cnn = New ADODB.Connection Set rst = New ADODB.Recordset cnn.Open "ConnectionName" rst.ActiveConnection = cnn rst.CursorLocation = adUseServer rst.Source = "Update Table ..." rst.Open Set rst = Nothing Set cnn = Nothing End Sub What I want to know is if and how I should deal with the rst object after opening it. Do I close it? When I try doing rst.Close, I get the error: "Operation is not allowed when the object is closed". The code works fine without rst.Close, I'm wondering if there are any dangers to not closing the object.

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• Difference between an LL and Recursive Descent parser?

  - by Noldorin

  I've recently being trying to teach myself how parsers (for languages/context-free grammars) work, and most of it seems to be making sense, except for one thing. I'm focusing my attention in particular on LL(k) grammars, for which the two main algorithms seem to be the LL parser (using stack/parse table) and the Recursive Descent parser (simply using recursion). As far as I can see, the recursive descent algorithm works on all LL(k) grammars and possibly more, whereas an LL parser works on all LL(k) grammars. A recursive descent parser is clearly much simpler than an LL parser to implement, however (just as an LL one is simply than an LR one). So my question is, what are the advantages/problems one might encounter when using either of the algorithms? Why might one ever pick LL over recursive descent, given that it works on the same set of grammars and is trickier to implement? Hopefully this question makes some amount of sense. Sorry if it doesn't - I blame my the fact that this entire subject is almost entirely new to me.

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• What is a good way to animate UIViews inside UITableViewCell after a callback?

  - by erotsppa

  We couldn't find a way to animate UIViews inside a UITableCell as an action from a callback. Suppose in a scenario where you click on a button on the UITableViewCell and it fires off an asynchronous action to download a picture. Suppose further that when the picture is downloaded we want a UIView in the cell to animate the picture to give user a visual feedback that something new is about to be presented. We couldn't find a way to track down the UIVIew to invoke beginAnimation on because the original cell that the user clicked on might now be used for another row due to the nature of cells being reused when you scroll up and down in the table. In other words we can't keep a pointer to that UITableViewCell. We need to find another way to target the cell and animate it if that row is visible and don't animate if the row is scrolled out of range.

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• SQL to retrieve the latest records, grouping by unique foreign keys

  - by jbox

  I'm creating query to retrieve the latest posts in a forum using a SQL DB. I've got a table called "Post". Each post has a foreign key relation to a "Thread" and a "User" as well as a creation date. The trick is I don't want to show two posts by the same user or two posts in the same thread. Is it possible to create a query that contains all this logic? # Grab the last 10 posts. SELECT id, user_id, thread_id FROM posts ORDER BY created_at DESC LIMIT 10; # Grab the last 10 posts, max one post per user SELECT id, user_id, thread_id FROM post GROUP BY user_id ORDER BY date DESC LIMIT 10; # Grab the last 10 posts, max one post per user, max one post per thread???

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• Python SQLite: database is locked

  - by user322683

  I'm trying this code: import sqlite connection = sqlite.connect('cache.db') cur = connection.cursor() cur.execute('''create table item (id integer primary key, itemno text unique, scancode text, descr text, price real)''') connection.commit() cur.close() I'm catching this exception: Traceback (most recent call last): File "cache_storage.py", line 7, in <module> scancode text, descr text, price real)''') File "/usr/lib/python2.6/dist-packages/sqlite/main.py", line 237, in execute self.con._begin() File "/usr/lib/python2.6/dist-packages/sqlite/main.py", line 503, in _begin self.db.execute("BEGIN") _sqlite.OperationalError: database is locked Permissions for cache.db are ok. Any ideas?

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• getting last insert id .sqlalchemy orm

  - by gummmibear

  Hi i use sqlalchemy, i need some help. import hashlib import sqlalchemy as sa from sqlalchemy import orm from allsun.model import meta t_user = sa.Table("users",meta.metadata,autoload=True) class Duplicat(Exception): pass class LoginExistsException(Exception): pass class EmailExistsException(Exception): pass class User(object): """ def __setattr__(self, key, value): if key=='password' : value=unicode(hashlib.sha512(value).hexdigset()) object.__setattr__(self,key,value) """ def loginExists(self): try: meta.Session.query(User).filter(User.login==self.login).one() except orm.exc.NoResultFound: pass else: raise LoginExistsException() def emailExists(self): try: meta.Session.query(User).filter(User.email==self.email).one() except orm.exc.NoResultFound: pass else: raise EmailExistsException() def save(self): meta.Session.begin() meta.Session.save(self) try: meta.Session.commit() except sa.exc.IntegrityError: raise Duplicat() How can i get inserted id when i call? user = User() user.login = request.params['login'] user.password = hashlib.sha512(request.params['password']).hexdigest() user.email = request.params['email'] user.save()

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• How to change values of ListView elements in Codebehind

  - by Viredae

  Hello, I'm trying to create a table with Listview and one of the fields I'm using is supposed to show a hyperlink to a more detailed view of the data shown, how I want to do that is by using FindControl on the ID of that item and then changing the value into a hyperlink of the detailed view page with a querystring attached, the problem is that I have no idea how to re-insert that data back into the listview field, which looks something like this: <ItemTemplate> <td> <asp:Label ID="ViewLinkLabel" runat="server" Text='[insert Link Here]' /> </td> </ItemTemplate> Please bear in mind that I'm still an amateur in ASP.net, and if any of this seems too convoluted when there's a much easier to do this that I don't know about. Thank you

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• How can I force a major upgrade to not switch to maintenance mode using the old installation package

  - by Brian

  I have an installer that I would like to use for a major upgrade. I have done the following: Increased the version number (from a.b.c to a.b.c+1) Changed the ProductCode Kept the same UpgradeCode Made the appropriate entry in the Upgrade table Changed the component ID of an existing component Changed the name of the installer package Changed the PackageCode Basically I've done everything I can think of to force MSI to treat this as a major upgrade. However, when I attempt to install this new package, the installer log says "Product registered: entering maintenance mode" and proceeds to try to find the old installer file (which fails, since the new installer is in a different folder than was used for the original installation, and wasn't even what I wanted to happen). What am I missing? Why does the installer switch to maintenance mode right away rather than perform the major upgrade? Thanks!

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• (Oracle Performance) Will a query based on a view limit the view using the where clause?

  - by BestPractices

  In Oracle (10g), when I use a View (not Materialized View), does Oracle take into account the where clause when it executes the view? Let's say I have: MY_VIEW = SELECT * FROM PERSON P, ORDERS O WHERE P.P_ID = O.P_ID And I then execute the following: SELECT * FROM MY_VIEW WHERE MY_VIEW.P_ID = '1234' When this executes, does oracle first execute the query for the view and THEN filter it based on my where clause (where MY_VIEW.P_ID = '1234') or does it do this filtering as part of the execution of the view? If it does not do the latter, and P_ID had an index, would I also lose out on the indexing capability since Oracle would be executing my query against the view which doesn't have the index rather than the base table which has the index?

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• Object Reference Error filling a datarow

  - by JPJedi

  This is the code: Dim dr() As DataRow = DataSet.Tables("TableName").Select("EVENTNAME = '" & name & "'") I get an "Object reference not set to an instance of an object." Error when this line is executed. It is looping through a list of selected items in a listbox. I think it has to do with how I have the datarow declared because I can look at the name and I see it ok and I also do a null check on the name before I use it. Visual Studio 2008, VB.NET. Any ideas? Yep it was a wrong table name. I guess after looking at the code for 8 hours that minor detail I just wasn't thinking to check. Thanks!

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• Dynamically Added CheckBox Column is Disabled in GridView

  - by Mark Maslar

  I'm dynamically adding a Boolean column to a DataSet. The DataSet's table is the DataSource for a GridView, which AutoGenerates the columns. Issue: The checkboxes for this dynamically generated column are all disabled. How can I enable them? ds.Tables["Transactions"].Columns.Add("Retry", typeof(System.Boolean)); ds.Tables["Transactions"].Columns["Retry"].ReadOnly = false; In other words, how can I control how GridView generates the CheckBoxes for a Boolean field? (And why does setting ReadOnly to False have no effect?) Thanks!

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