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• How can I treat a sequence value like a generated key?

  - by Jeff Knecht

  Here is my situation and my constraints: I am using Java 5, JDBC, and DB2 9.5 My database table contains a BIGINT value which represents the primary key. For various reasons that are too complicated to go into here, the way I insert records into the table is by executing an insert against a VIEW; an INSTEAD OF trigger retrieves the NEXT_VAL from a SEQUENCE and performs the INSERT into the target table. I can change the triggers, but I cannot change the underlying table or the general approach of inserting through the view. I want to retrieve the sequence value from JDBC as if it were a generated key. Question: How can I get access to the value pulled from the SEQUENCE. Is there some message I can fire within DB2 to float this sequence value back to the JDBC driver?

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• How to use a class as the base, but hide the class type publically?

  - by James

  I am currently just exposing the properties through a generic interface e.g. public interface IBaseClass { int ID { get; set; } } internal class MyBaseClass : IBaseClass { public MyBaseClass() { } public int ID { get; set; } } public class MyExposedClass : IBaseClass { private MyBaseClass _base = new MyBaseClass(); public int ID { get { return _base.ID; } set { _base.ID = value; } } } Then in my main application I can do: IBaseClass c = new MyExposedClass(); c.ID = 12345; But can't do: MyBaseClass b = new MyBaseClass(); This is my desired behaviour. However, I was just wondering if this is the correct approach? Or if there was a better way?

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• How to explain to a developer that adding extra if - else if conditions is not a good way to "improv

  - by Lilit

  Recently I've bumped into the following C++ code: if (a) { f(); } else if (b) { f(); } else if (c) { f(); } Where a, b and c are all different conditions, and they are not very short. I tried to change the code to: if (a || b || c) { f(); } But the author opposed saying that my change will decrease readability of the code. I had two arguments: 1) You should not increase readability by replacing one branching statement with three (though I really doubt that it's possible to make code more readable by using else if instead of ||). 2) It's not the fastest code, and no compiler will optimize this. But my arguments did not convince him. What would you tell a programmer writing such a code? Do you think complex condition is an excuse for using else if instead of OR?

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• How to get dataset to populate data into dbgrid in Delphi 6?

  - by Chris J

  I have created a DBGrid in Delphi 6 and tied it to a DataSource contained in a DataModule. The Dataset for that source in also located in the same module. In the OnShow event for the form, I activate the dataset and set a label equal to the rowcount for the dataset. This shows several hundred rows but nothing shows in the dbgrid. If I activate the dataset in the IDE, the grid populates with the expected data. Does anyone have any idea why this behaviour would change between the IDE and normal runtime? We are also using SDAC connection components. All 3rd party component choices are not mine to change. I can elaborate as necessary for clarification, but I mainly need troubleshooting ideas to start at.

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• "rake test" doesn't load fixtures?

  - by Pavel K.

  when i run rake test --trace here's what happens ** Invoke test (first_time) ** Execute test ** Invoke test:units (first_time) ** Invoke db:test:prepare (first_time) ** Invoke db:abort_if_pending_migrations (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute db:abort_if_pending_migrations ** Execute db:test:prepare ** Invoke db:test:load (first_time) ** Invoke db:test:purge (first_time) ** Invoke environment ** Execute db:test:purge ** Execute db:test:load ** Invoke db:schema:load (first_time) ** Invoke environment ** Execute db:schema:load ** Execute test:units /usr/bin/ruby1.8 -I"lib:test".... (and after that fails because there's no fixtures loaded) why doesn't it load fixtures (i thought that would be default behaviour) and how do i make it load fixtures before executing tests??? p.s. my test/test_helper.rb content is: ENV["RAILS_ENV"] = "test" require File.expand_path(File.dirname(__FILE__) + "/../config/environment") require 'test_help' class ActiveSupport::TestCase self.use_transactional_fixtures = true self.use_instantiated_fixtures = false fixtures :all end (rails 2.3.4)

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• Update FB:Like URL Dynamically using JavaScript

  - by br4inwash3r

  i'd like to change the URL to like of an FB:Like button dynamically using javascript. right now i've been able to change the href attribute of the fb:like tag (i've pasted the code below). but that doesn't work. perhaps i have to re-initiate the FB:Like button, but so far i can't figure out how.. function update_share(container, url) { // update fb:like href value var container = container[0] || document.body; var button = container.getElementsByTagName('fb:like'); button[0].setAttribute('href', url); } any help would be appreciated. thx..

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• javascript show/hide with memory

  - by gloris

  Hi, i have this show/hide menu. It is possibly this menu make with memory?( I open sub menu, refresh page and this sub menu stil open. ) <script type="text/javascript"> function change(id){ ID = document.getElementById(id); if(ID.style.display == "") ID.style.display = "none"; else ID.style.display = ""; } </script> <div onclick="change(5)" style="cursor: hand"> <a href = "#">+</a>News </div> <div style="display: none" id="5"> News1<br/> News2<br/> </div>

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• Switching to FormViewMode.Edit is very slow

  - by Tim

  When i switch an ASP.Net Formview from readonly mode to edit mode it takes more than 6 seconds(from edit to readonly takes a split second). I have no idea whats the reason for it. The EditItemTemplate contains a lot of controls(table,textboxes,dropdownlists) but in fact not more than the ItemTemplate has. Yet i have even commented out the complete FormView.DataBound where the controls are data bounded but without significant change. My ASP.Net Web Apllication is using Ajax and the Formview is completely nested in an UpdatePanel. Any suggestions or assumptions for this behaviour?

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• Manually Building a Tree in CakePHP

  - by mabwi

  I'm currently working on building an application in CakePHP. There's a quite extensive existing data set that's conceptually a tree, but wasn't previously stored as one. What I mean by that, is there's no real relationship defined in the data. The problem I'm having is getting it to work correctly with the CakePHP tree behaviour. Because I have to set all the values on existing data - as opposed to Cake setting up the structure as elements are inserted - I need to understand how the lft/rght values work. So, I guess the question is: How does the structure data work, specifically the lft/rght values? How do I set it up so that the data comes out rationally, without inserting them one at a time? It's a 2 level tree, with Sections and sub-sections. Thanks for the help

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• Can I use python ast module for this?

  - by Juanjo Conti

  I'd like to write a program that modify python programs in this way: change "some literal string %" % SOMETHING to functioncall("some literal string %") % SOMETHING Thanks,

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• WPF input datagrid?

  - by SAD

  I would like to create an input DataGrid - an empty set of rows with the column headers that can be filled with data by a user and then saved to a database. The DataGrid will not be therefore used to display data but acts like an input field. The behaviour would be similar to the one of Excell. The problem is that if the DataGrid has no data provided for it, it is not visible in the application and the user cannot enter anything. Is the DataGrid a good choice? How can this sort of functionality be implemented with a different control? I would prefer to use the DataGrid tough. Thanks a lot for any help on this.

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• filter queryset based on list, including None

  - by jujule

  Hi all I dont know if its a django bug or a feature but i have a strange ORM behaviour with MySQL. class Status(models.Model): name = models.CharField(max_length = 50) class Article(models.Model) status = models.ForeignKey(status, blank = True, null=True) filters = Q(status__in =[0, 1,2] ) | Q(status=None) items = Article.objects.filter(filters) this returns Article items but some have other status than requested [0,1,2,None] looking at the sql query : SELECT [..] FROM `app_article` LEFT OUTER JOIN `app_status` ON (`app_article`.`status_id` = `app_status`.`id`) WHERE (`app_article`.`status_id` IN (1, 2) OR `app_status`.`id` IS NULL) ORDER BY [...] the OR app_status.id IS NULL part seems to be the cause. if i change it to OR app_article.status_id IS NULL it works correctly. How to deal with this ? Thanx.

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• xcode storyboard reverting in compile

  - by darren

  I started having some very odd behaviour in Xcode 4.5 recently. I made a change to a UITableViewController with static cells but the changes did not appear in the simulator and neither did my code changes. I removed the app from the simulator and ran clean on the project, then started again and all the changes appeared. I made another code change, ran the debugger via simulator and once again I saw my old UITableViewController values and my code changes were absent. This project is using storyboards, but I am not sure if this problem is related to just storyboards given my code changes are reverted as well. I am deeply confused here. Not even clean fixed this issue. Any thoughts or suggestions?

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• HTML/Javascript: Is it possible to remember the filename from a fileupload field ONLY and then later

  - by Pieter Breed

  I have a HTML file upload field from which I'm reading the file name of the file that the user specifies. The actual contents of the file is never uploaded. At a later stage, is it possible to construct a link using this file name information so that if the user clicks on this link, the original file is launched into a new browser window? If not, what are the reason for disallowing this behaviour? The purpose of such a feature is to store links to documents that are available on a mapped local drive or a network share.

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• (C#) How do you de-elevate permissions for a child process

  - by Davy8

  I know how to launch a process with Admin privileges from a process using: proc.StartInfo.UseShellExecute = true; proc.StartInfo.Verb = "runas"; where proc is a System.Diagnostics.Process. But how does one do the opposite? If the process you're in is already elevated, how do you launch the new process without admin privileges? More accurately, we need to launch the new process with the same permission level as Windows Explorer, so no change if UAC is diabled, but if UAC is enabled, but our process is running elevated, we need to perform a certain operation un-elevated because we're creating a virtual drive and if it's created with elevated permissions and Windows explorer is running unelevated it won't show up. Feel free to change the title to something better, I couldn't come up with a good description

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• MySQL update error when special characters are used

  - by Katy

  Hi All, I was wondering if anyone had come across this one before. I have a customer who uses special characters in their product description field. Updating to a MySQL database works fine if we use their HTML equivalents but it fails if the character itself is used (copied from either character map or Word I would assume). Has anyone seen this behaviour before? The character in question in this case is ø - and we can't seem to do a replace on it (in ASP at least) as the character comes though to the SQL string as a "?". Any suggestions much appreciated - thanks!

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• asp.net drop down list viewstate issue after client side Ajax update

  - by DSharper

  In my aspx page I have drop down list that initialy in page load event loads up with list of values which is shown to client(drop down list "A") and in client side, depending on client selecion of another drop down list(drop down list "B") I have written a javascript to update drop down list "A" with corresponding values with Ajax behaviour(without full page postback). But when we post page to the server, in server side page load event shows initialy sent list of values for drop down list "A" but not the values that were loaded by Ajax calls due to ViewState not being updated correctly due to Ajax call. I could fix this easily with update panel but it increased Ajax request size to 44KB which is much higher than what currently is for hand made Ajax script I have written( 0.5KB) Is there special way of fixing this rather than using update panel?

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• How to make a google-like auto complete textbox with C# in an application?

  - by shevron

  Hey! I tried to find a solution but I didn't found what I was searching for. So here is my problem. I want a google like behaviour with a textbox. As I type "dum" it should find dummy in the database and display it as option under the textbox. It should be selectable. I don't use ASP.net or any other stuff. Just pure C#. Thanks for your help!

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• git - is there a way to get only required files in the working directory

  - by spoonboy

  I'm new to git and trying to use it with a project that has many (several hundreds) sources. The problem I have is that git is extracting all the project's sources to my working directory when doing checkout. This makes a lot of mess as I have to jump between the files and can unintentionally change/corrupt files that I wasn't even planning to change. I would prefer to extract only sources that I'm going to modify and then work with them. So, is there a way to tell git that I only going to work with specific sources, and so, that only these sources would be extracted to the working directory? Note, that this is not a partial checkout or something like this. I'm ok to checkout the whole branch. It's more about organising a working folder. Thanks.

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• User Drawn Controls: the MSN chat window

  - by Tommy

  I'm wondering about the famous MSN chat clients conversation windows! I'm sure there must be alot of different aspects but I'd like to focus on those little sliding panes. For instance where the pictures of the people in the conversation is displayed. When you click the collapse button the pictures dissapear and the panel gracefully slides in, and when you click it again to expand, it slides out and the pictures are smoothly faded in. How would one go about customly drawing a control in WinForms that had simmilar behaviour?

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• imageview draw issue with asynctask

  - by alexb

  Have the following asynctask that i'm using to download some images. Works fine except for the very first image, which doesn't always appears unless I do something like move to the next image and then back again. public class DownloadImageTask extends AsyncTask { static ImageView _imageView=null; public DownloadImageTask(ImageView ctl){ _imageView=ctl; } protected void onPostExecute(Bitmap result) { _imageView.setImageBitmap(result); } ... } I thought this might be an issue with updating the UI on a background thread, so I reworked this using an abstract class that invokes a method on the UI thread that calls .setImageBitmap() but I still get the same behaviour - works fine for all images except the first, unless I move to the next image and back again. Is there a way to force a redraw on the imageview after i set the image?

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• UINavigationController doesn't fully push view and only changes the Navigation toolbar to the next v

  - by user284757

  So I have an iPhone application that utilizes a UINavigationController for setting up the views. When the application first starts, it presents the user with a UITableViewController and the user can select an item and it will push another view. Now I have it set so that my app remembers the user's last selection and automatically selects it and loads the correct view controller. The only problem is that I am experiencing a really weird glitch when I load the next view automatically.. When the view is pushed, the navigation toolbar will change so that a back button directed to the previous view is showing but it won't display the next view. It will instead keep showing the table view and I can interact with it as well. I can press the back button and it will change the toolbar back and the tableview is still shown. Then when I select an item it loads the view just fine. Thanks for the help.

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• Changing the cursor in WPF sometimes works, sometimes doesn't

  - by Scott

  On several of my usercontrols, I change the cursor by using this.Cursor = Cursors.Wait; when I click on something. Now I want to do the same thing on a WPF page on a button click. When I hover over my button, the cursor changes to a hand, but when I click it, it doesn't change to the wait cursor. I wonder if this has something to do with the fact that it's a button, or because this is a page and not a usercontrol? This seems like weird behavior.

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• How does Git know which Index blob to add to a tree?

  - by drozzy

  In Pro Git Ch9 the author says: Git normally creates a tree by taking the state of your staging area or index and writing a tree object from it. My question is how does git know which of two consequitive index entries to create the Tree object from? For example: $ echo 'First change' > one.txt $ git add one.txt $ find .git/objects -type f .git/objects/1f/755a7fffe4 //first index entry $ echo 'Second change' > one.txt $ git add one.txt $ find .git/objects -type f .git/objects/2d/234asdf2 //second index entry $ git commit -a -m "Initial commit" $ git cat-file master^{tree} 100644 blob 2d234asdf2 one.txt //How did it know not to take 1f755?? Does it just look at the blob timestamps? Also - what happens to the first blob created - no one is referencing it. Does it just get destroyed or forgotten?

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• jquery - setting a limit of items, that can be dragged into a list

  - by maschek

  Hi, i have this two lists, from which i can move items from one to another with jquery ui and connect lists, with ajax. If an item is pulled over, a message is generated in a php file and then it appears on screen. Now i want that for example the right list should be allowed to contain ten items at max. It would be great if it would be possible with jquery, that if there is already ten items in the list and you go and drag the eleventh, if then the item would somehow vanish, maybe with a little effekt. I think maybe reading out db in the php-file if theres already ten items, and so on. But i have currently no idea, if and in case if in which way, jquery would support this kind of behaviour. Can you give me some advise? Greetings, maschek

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