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• ComboBox exception caused in winforms FormClosing event

  - by Spooky2010

  Using c# vs2008 winforms I have an application with a bunch of child winforms. Each time a form is closed I need to store the current selected value of a combobox that is on each form to a Global application variable so that I can track it and use it in new forms. The combobox is populated on form start via a method to set its datasource to an ArrayList of items What I have found is if the combobox is populated with items in the designer, and you try to get the combobox value in the form closing event, I always get a NullReferenceException. However if the comboBox has an datasource like I DO have in my application and I try to get the combobox value in the form closing event then I would say 95% of the time I DO NOT get the NullReferenceException, but I do get it 5% of the time. That ratio can even vary depending on what computer I run the application on. for example I have 1 computer where the exception always occurs. My question is therefore what is (the best) way to get the value of the combobox, last thing before the form closes without causing the exception. I would def prefer to do it last thing before the form closes rather than track it with every selected index change event. Any advice appreciated.

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• EF 4.0 : Save Changes Retry Logic

  - by BGR

  Hi, I would like to implement an application wide retry system for all entity SaveChanges method calls. Technologies: Entity framework 4.0 .Net 4.0 namespace Sample.Data.Store.Entities { public partial class StoreDB { public override int SaveChanges(System.Data.Objects.SaveOptions options) { for (Int32 attempt = 1; ; ) { try { return base.SaveChanges(options); } catch (SqlException sqlException) { // Increment Trys attempt++; // Find Maximum Trys Int32 maxRetryCount = 5; // Throw Error if we have reach the maximum number of retries if (attempt == maxRetryCount) throw; // Determine if we should retry or abort. if (!RetryLitmus(sqlException)) throw; else Thread.Sleep(ConnectionRetryWaitSeconds(attempt)); } } } static Int32 ConnectionRetryWaitSeconds(Int32 attempt) { Int32 connectionRetryWaitSeconds = 2000; // Backoff Throttling connectionRetryWaitSeconds = connectionRetryWaitSeconds * (Int32)Math.Pow(2, attempt); return (connectionRetryWaitSeconds); } /// <summary> /// Determine from the exception if the execution /// of the connection should Be attempted again /// </summary> /// <param name="exception">Generic Exception</param> /// <returns>True if a a retry is needed, false if not</returns> static Boolean RetryLitmus(SqlException sqlException) { switch (sqlException.Number) { // The service has encountered an error // processing your request. Please try again. // Error code %d. case 40197: // The service is currently busy. Retry // the request after 10 seconds. Code: %d. case 40501: //A transport-level error has occurred when // receiving results from the server. (provider: // TCP Provider, error: 0 - An established connection // was aborted by the software in your host machine.) case 10053: return (true); } return (false); } } } The problem: How can I run the StoreDB.SaveChanges to retry on a new DB context after an error occured? Something simular to Detach/Attach might come in handy. Thanks in advance! Bart

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• SQL Server CLR stored procedures in data processing tasks - good or evil?

  - by Gart

  In short - is it a good design solution to implement most of the business logic in CLR stored procedures? I have read much about them recently but I can't figure out when they should be used, what are the best practices, are they good enough or not. For example, my business application needs to parse a large fixed-length text file, extract some numbers from each line in the file, according to these numbers apply some complex business rules (involving regex matching, pattern matching against data from many tables in the database and such), and as a result of this calculation update records in the database. There is also a GUI for the user to select the file, view the results, etc. This application seems to be a good candidate to implement the classic 3-tier architecture: the Data Layer, the Logic Layer, and the GUI layer. The Data Layer would access the database The Logic Layer would run as a WCF service and implement the business rules, interacting with the Data Layer The GUI Layer would be a means of communication between the Logic Layer and the User. Now, thinking of this design, I can see that most of the business rules may be implemented in a SQL CLR and stored in SQL Server. I might store all my raw data in the database, run the processing there, and get the results. I see some advantages and disadvantages of this solution: Pros: The business logic runs close to the data, meaning less network traffic. Process all data at once, possibly utilizing parallelizm and optimal execution plan. Cons: Scattering of the business logic: some part is here, some part is there. Questionable design solution, may encounter unknown problems. Difficult to implement a progress indicator for the processing task. I would like to hear all your opinions about SQL CLR. Does anybody use it in production? Are there any problems with such design? Is it a good thing?

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• Django Admin: not seeing any app (permission problem?)

  - by Facundo

  I have a site with Django running some custom apps. I was not using the Django ORM, just the view and templates but now I need to store some info so I created some models in one app and enabled the Admin. The problem is when I log in the Admin it just says "You don't have permission to edit anything", not even the Auth app shows in the page. I'm using the same user created with syncdb as a superuser. In the same server I have another site that is using the Admin just fine. Using Django 1.1.0 with Apache/2.2.10 mod_python/3.3.1 Python/2.5.2, with psql (PostgreSQL) 8.1.11 all in Gentoo Linux 2.6.23 Any ideas where I can find a solution? Thanks a lot. UPDATE: It works from the development server. I bet this has something to do with some filesystem permission but I just can't find it. UPDATE2: vhost configuration file: <Location /> SetHandler python-program PythonHandler django.core.handlers.modpython SetEnv DJANGO_SETTINGS_MODULE gpx.settings PythonDebug On PythonPath "['/var/django'] + sys.path" </Location> UPDATE 3: more info /var/django/gpx/init.py exists and is empty I run python manage.py from /var/django/gpx directory The site is GPX, one of the apps is contable and lives in /var/django/gpx/contable the user apache is webdev group and all these directories and files belong to that group and have rw permission UPDATE 4: confirmed that the settings file is the same for apache and runserver (renamed it and both broke) UPDATE 5: /var/django/gpx/contable/init.py exists This is the relevan part of urls.py: urlpatterns = patterns('', (r'^admin/', include(admin.site.urls)), ) urlpatterns += patterns('gpx', (r'^$', 'menues.views.index'), (r'^adm/$', 'menues.views.admIndex'),

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• Custom Database integration with MOSS 2007

  - by Bob

  Hopefully someone has been down this road before and can offer some sound advice as far as which direction I should take. I am currently involved in a project in which we will be utilizing a custom database to store data extracted from excel files based on pre-established templates (to maintain consistency). We currently have a process (written in C#.Net 2008) that can extract the necessary data from the spreadsheets and import it into our custom database. What I am primarily interested in is figuring out the best method for integrating that process with our portal. What I would like to do is let SharePoint keep track of the metadata about the spreadsheet itself and let the custom database keep track of the data contained within the spreadsheet. So, one thing I need is a way to link spreadsheets from SharePoint to the custom database and vice versa. As these spreadsheets will be updated periodically, I need tried and true way of ensuring that the data remains synchronized between SharePoint and the custom database. I am also interested in finding out how to use the data from the custom database to create reports within the SharePoint portal. Any and all information will be greatly appreciated.

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• Java List with Objects - find and replace (delete) entry if Object with certain attribute already ex

  - by Sophomore

  Hi there I've been working all day and I somehow can't get this probably easy task figured out - probably a lack of coffee... I have a synchronizedList where some Objects are being stored. Those objects have a field which is something like an ID. These objects carry information about a user and his current state (simplified). The point is, that I only want one object for each user. So when the state of this user changes, I'd like to remove the "old" entry and store a new one in the List. protected static class Objects{ ... long time; Object ID; ... } ... if (Objects.contains(ID)) { Objects.remove(ID); Objects.add(newObject); } else { Objects.add(newObject); } Obviously this is not the way to go but should illustrate what I'm looking for... Maybe the data structure is not the best for this purpose but any help is welcome!

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• Sugar CRM Soap call not working properly

  - by Jasim

  I have sugar crm instance and i was trying to get some data from it using soap service. Below is the code which i am using for it. When i run the same code , sometimes it is returning correct data, sometimes it not. Can any one tell me what the problem is?? include "nusoap.php"; $client = new soapclient('http://asdf.net/test/urbancrm_2009_06_22/soap.php'); // Login to SugarCRM $auth_array = array( 'user_auth' => array( 'user_name' => '******', 'password' => '*******' ), ); $response = $client->call('login', $auth_array); if (!$response['error']['number']){ // Successfully logged in $session_id = $response['id']; //$response = $client->call('get_entry_list',array('session'=>$session_id , 'module_name'=>'Users', 'query'=>'', 'order_by'=>'','offset'=>'','select_fields'=>array('id','user_name'))); $response = $client->call('get_entry_list',array('session'=>$session_id , 'module_name'=>'itf_Apartments', "query"=>"itf_apartments_cstm.neighborhood_c='Loop'", 'order_by'=>'','offset'=>'','select_fields'=>array('name','studio','convertible','one_bedroom','one_bedroom_plus_den','two_bedroom','two_bedroom_plus_den','penthouse','photo_c','building_type_c','neighborhood_c'))); //$response = $client->call('get_entry_list',array('session'=>$session_id , 'module_name'=>'itf_Apartments', 'query'=>'itf_apartments_cstm.urbanlux_id_c="1"', 'order_by'=>'','offset'=>'','select_fields'=>array('name','studio','convertible','one_bedroom','one_bedroom_plus_den','two_bedroom','two_bedroom_plus_den','penthouse',))); //store id and user name as a key value pair in array //echo "---"; print_r($response); } else { echo "else"; print_r($response); } ?

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• Why does my J2ME DateField not display the correct date?

  - by olly

  I am storing values and date values in a record store. I have my date field set up like this: StartDate = new DateField("Start Date ", DateField.DATE); cal1 = Calendar.getInstance(); cal1.set(Calendar.YEAR, 2009); cal1.set(Calendar.MONTH, 0); cal1.set(Calendar.DAY_OF_MONTH, 1); StartDate.setDate(cal1.getTime()); and I save the date as a string as follows: strStartDate = cal1.get(cal1.DAY_OF_MONTH) + "/" + (cal1.get(cal1.MONTH) + 1) + "/" + cal1.get(cal1.YEAR); String detailsToAdd = strStartDate (I have shortened the code.) Now, I want to be able to edit the date at a future stage. However, I need the code to be able to do this. So far I have: EStartDate = new DateField("Start Date ", DateField.DATE); I had to change the name of the DateField box as this was conflicting with other things. I basically need to be able to show the selected record's date attribute. I currently have the other information displayed. I just need to be able to show the correct date. When I run the program the date field says <date>. Any help will be nice

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• In-document schema declarations and lxml

  - by shylent

  As per the official documentation of lxml, if one wants to validate a xml document against a xml schema document, one has to construct the XMLSchema object (basically, parse the schema document) construct the XMLParser, passing the XMLSchema object as its schema argument parse the actual xml document (instance document) using the constructed parser There can be variations, but the essense is pretty much the same no matter how you do it, - the schema is specified 'externally' (as opposed to specifying it inside the actual xml document). If you follow this procedure, the validation occurs, sure enough, but if I understand it correctly, that completely ignores the whole idea of the schemaLocation and noNamespaceSchemaLocation attributes from xsi. This introduces a whole bunch of limitations, starting with the fact, that you have to deal with instance<-schema relation all by yourself (either store it externally or write some hack to retrieve the schema location from the root element of the instance document), you can not validate the document using multiple schemata (say, when each schema governs its own namespace) and so on. So the question is: maybe I am missing something completely trivial or doing it wrong? Or are my statements about lxml's limitations regarding schema validation true? To recap, I'd like to be able to: have the parser use the schema location declarations in the instance document at parse/validation time use multiple schemata to validate a xml document declare schema locations on non-root elements (not of extreme importance) Maybe I should look for a different library? Although, that'd be a real shame, - lxml is a de-facto xml processing library for python and is regarded by everyone as the best one in terms of performace/features/convenience (and rightfully so, to a certain extent)

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• SQL Compact allow only one WCF Client

  - by Andreas Hoffmann

  Hi, I write a little Chat Application. To save some infos like Username and Password I store the Data in an SQL-Compact 3.5 SP1 Database. Everything working fine, but If another (the same .exe on the same machine) Client want to access the Service. It came an EndpointNotFound exception, from the ServiceReference.Class.Open() at the Second Client. So i remove the CE Data Access Code and I get no Error (with an if (false)) Where is the Problem? I googled for this, but no one seems the same error I get :( SOLUTION I used the wrapper in http://csharponphone.blogspot.com/2007/01/keeping-sqlceconnection-open-and-thread.html for threat safty, and now it works :) Client Code: public test() { var newCompositeType = new Client.ServiceReference1.CompositeType(); newCompositeType.StringValue = "Hallo" + DateTime.Now.ToLongTimeString(); newCompositeType.Save = (Console.ReadKey().Key == ConsoleKey.J); ServiceReference1.Service1Client sc = new Client.ServiceReference1.Service1Client(); sc.Open(); Console.WriteLine("Save " + newCompositeType.StringValue); sc.GetDataUsingDataContract(newCompositeType); sc.Close(); } Server Code public CompositeType GetDataUsingDataContract(CompositeType composite) { if (composite.Save) { SqlCeConnection con = new SqlCeConnection(Properties.Settings.Default.Con); con.Open(); var com = con.CreateCommand(); com.CommandText = "SELECT * FROM TEST"; SqlCeResultSet result = com.ExecuteResultSet(ResultSetOptions.Scrollable | ResultSetOptions.Updatable); var rec = result.CreateRecord(); rec["TextField"] = composite.StringValue; result.Insert(rec); result.Close(); result.Dispose(); com.Dispose(); con.Close(); con.Dispose(); } return composite; }

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• Skipping one item in the column

  - by zurna

  I created a simple news website. I store both videos and images in IMAGES table. Videos added have videos and images added have images stored in a column called ImagesType. Images and Videos attached to a news is stored in ImagesID column of the NEWS table. My problem occurs when I need to display the first image of a news. i.e. IMAGES table: ImagesID ImagesLgURL ImagesType 1 /FLPM/media/videos/0H7T9C0F.flv videos 2 /FLPM/media/images/8R5D7M8O.jpg images 3 /FLPM/media/images/0E7Q9Z0C.jpg images NEWS table NewsID ImagesID NewsTitle 1 1;2; Street Chic: Paris ERROR 2 3; Paris Runway NO ERROR The following code give me an error with the 2nd news item because the first ImageID stored in the list is not an image but a video. I need to figure out a way to skip the video item and display the next image. I hope I made sense. SQL = "SELECT NEWSID, CATEGORIESID, IMAGESID, NEWSTITLE, NEWSSHORTDESC, NEWSACTIVE, NEWSDATEENTERED" SQL = SQL & " FROM NEWS N" SQL = SQL & " WHERE NEWSACTIVE = 1" SQL = SQL & " ORDER BY NEWSDATEENTERED DESC" Set objNews = objConn.Execute(SQL) Do While intLooper1 <= 3 And Not objNews.EOF IMAGES = Split(Left(objNews("IMAGESID"),Len(objNews("IMAGESID"))-1), ";") SQL = "SELECT ImagesID, ImagesName, ImagesLgURL, ImagesSmURL, ImagesType" SQL = SQL & " FROM IMAGES I" SQL = SQL & " WHERE ImagesID = " & IMAGES(0) & " AND ImagesType = 'images'" Set objLgImage = objConn.Execute(SQL) <div> <a href="?Section=news&SubSection=redirect&NEWSID=<%=objNews("NEWSID")%>"> <img src="<%=objLgImage("ImagesLgURL")%>" alt="<%=objLgImage("ImagesName")%>" /> </a> </div> <% objLgImage.Close Set objLgImage = Nothing intLooper1 = intLooper1 + 1 objNews.MoveNext Loop %>

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• How do I detect if there is already a similar document stored in Lucene index.

  - by Jenea

  Hi. I need to exclude duplicates in my database. The problem is that duplicates are not considered exact match but rather similar documents. For this purpose I decided to use FuzzyQuery like follows: var fuzzyQuery = new global::Lucene.Net.Search.FuzzyQuery( new Term("text", queryText), 0.8f, 0); hits = _searcher.Search(query); The idea was to set the minimal similarity to 0.8 (that I think is high enough) so only similar documents will be found excluding those that are not sufficiently similar. To test this code I decided to see if it finds already existing document. To the variable queryText was assigned a value that is stored in the index. The code from above found nothing, in other words it doesn't detect even exact match. Index was build by this code: doc.Add(new global::Lucene.Net.Documents.Field( "text", text, global::Lucene.Net.Documents.Field.Store.YES, global::Lucene.Net.Documents.Field.Index.TOKENIZED, global::Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS)); I followed recomendations from bellow and the results are: TermQuery doesn't return any result. Query contructed with var _analyzer = new RussianAnalyzer(); var parser = new global::Lucene.Net.QueryParsers .QueryParser("text", _analyzer); var query = parser.Parse(queryText); var _searcher = new IndexSearcher (Settings.General.Default.LuceneIndexDirectoryPath); var hits = _searcher.Search(query); Returns several results with the maximum score the document that has exact match and other several documents that have similar content.

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• create app that has plugin which contains PyQt widget

  - by brian

  I'm writing an application that will use plugins. In the plugin I want to include a widget that allows the options for that plugin to be setup. The plugin will also include methods to operate on the data. What is is the best way to include a widget in a plugin? Below is pseudo code for what I've tried to do. My original plan was to make the options widget: class myOptionsWidget(QWidget): “”” create widget for plug in options “”” …. Next I planned on including the widget in my plugin: class myPlugin def __init__(self): self.optionWidget = myOptionsWidget() self.pluginNum = 1 …. def getOptionWidget(self): return(self.optionWidget) Then at the top level I'd do something like a = myPlugin() form = createForm(option=a.getOptionWidget()) … where createForm would create the form and include my plugin options widget. But when I try "a = myPlugin()" I get the error "QWidget: Must construct a QApplication before a QpaintDevice" so this method won't work. I know I would store the widget as a string and call eval on it but I'd rather not do that in case later on I want to convert the program to C++. What is the best way to write a plugin that includes a widget that has the options? Brian

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• ASP.NET MVC Model Binding into a List

  - by Maxim Z.

  In my ASP.NET MVC site, part of a feature allows the user to enter the hours when a certain venue is open. I've decided to store these hours in a VenueHours table in my database, with a FK-to-PK relationship to a Venues table, as well as DayOfWeek, OpeningTime, and ClosingTime parameters. In my View, I want to allow the user to only input the times they know about; in other words, some days may not be filled in for a Venue. I'm thinking of creating checkboxes that the user can check to enable the OpeningTime and ClosingTime fields for the DayOfWeek that the checkbox belongs to. My question relates to how to pass this information to my HttpPost Controller Action. As I know the maximum amount of Days that can be passed in (7), I could of course just write 7 nullable VenueHour parameters into my Action, but I'm sure there's a better way. Can I somehow bind the View information into a List that is passed to my Action? This will also help me if I run into a scenario where there is no limit to how much information the user can fill in.

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• Linq to XML: create an anonymous object with element attributes and values

  - by Phil Scholtes

  I'm new to Linq and I'm trying to query a XML document to find a list of account managers for a particular user. (I realize it might make more sense to put this in a database or something else, but this scenario calls for a XML document). <user emailAddress='[email protected]'> <accountManager department='Customer Service' title='Manager'>[email protected]</accountManager> <accountManager department='Sales' title='Account Manager'>[email protected]</accountManager> <accountManager department='Sales' title='Account Manager'>[email protected]</accountManager> </user> I trying to create a list of objects (anonymous type?) with properties consisting of both XElement attributes (department, title) and values (email). I know that I can get either of the two, but my problem is selecting both. Here is what I'm trying: var managers = _xDoc.Root.Descendants("user") .Where(d => d.Attribute("emailAddress").Value == "[email protected]") .SelectMany(u => u.Descendants("accountManager").Select(a => a.Value)); foreach (var manager in managers) { //do stuff } I can get at a.Value and a.Attribute but I can't figure out how to get both and store them in an object. I have a feeling it would wind up looking something like: select new { department = u.Attribute("department").Value, title = u.Attribute("title").Value, email = u.Value };

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• MVC Form and Dictionary Type

  - by Brian Schmitt

  I am attempting to use a property on my model that is of type Dictionary<string, string>. This dictionary is one of several other properties on the model, and I am using the dictionary as a key/value store to produce a 'dynamic' form. E.G.: User Name Settings A B I want to be able to submit and save any changes to settings A and B. I can submit the form and get my posted values in all my other fields, however the dictionary gets set to null. <%=Html.LabelFor(m => m.Name)%> <%=Html.DisplayFor(m => m.Name)%> <%=Html.LabelFor(m => m.Settings["A"])%> <%=Html.TextBoxFor(m => m.Settings["A"])%> <%=Html.LabelFor(m => m.Settings["B"])%> <%=Html.TextBoxFor(m => m.Settings["B"])%> Is there a better way to produce the dynamic form with a key/value pair? The actual code will be using partials (there several hundred variations), and the above is only a contrived example.

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• Caching a column in a polymorphic relationship

  - by Brendon Muir

  I have content management system application that uses a polymorphic tree table as the core of its arrangement. I've come into a problem where once the tree grows quite large, and because we have quite a few different modules (about 25), just doing :include = :instance doesn't cut the mustard. Instance is the name of our polymorphic relationship. The funny part is that in most cases when I want a large list of these items, all I really want is their name from the associated table (for the purposes of an index bar for example), all the rest is in the central table. So I thought that I should probably implement some sort of column cache for the name in the central table. (Like a counter cache that rails already does). I was just wondering if a plugin exists to manage this already? If not, I was just going to add a 'name' column to the central table and because all the polymorphic models inherit off a superclass, just add a callback that pushes the name across to the central table whenever the item is created or updated. I'd then just do a big migration to populate it in the first place? Any flaws to that design? I suppose to be more flexible the column could be some kind of serialised cache where I could store other things later on if need be? Gah! :D

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• Alternative to jQuery's .toggle() method that supports eventData?

  - by Bungle

  The jQuery documentation for the .toggle() method states: The .toggle() method is provided for convenience. It is relatively straightforward to implement the same behavior by hand, and this can be necessary if the assumptions built into .toggle() prove limiting. The assumptions built into .toggle have proven limiting for my current task, but the documentation doesn't elaborate on how to implement the same behavior. I need to pass eventData to the handler functions provided to toggle(), but it appears that only .bind() will support this, not .toggle(). My first inclination is to use a flag global to a single handler function to store the click state. In other words, rather than: $('a').toggle(function() { alert('odd number of clicks'); }, function() { alert('even number of clicks'); }); do this: var clicks = true; $('a').click(function() { if (clicks) { alert('odd number of clicks'); clicks = false; } else { alert('even number of clicks'); clicks = true; } }); I haven't tested the latter, but I suspect it would work. Is this the best way to do something like this, or is there a better way that I'm missing? Thanks!

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• Reading,Writing, Editing BLOBS through DataTables and DataRows

  - by Soham

  Consider this piece of code: DataSet ds = new DataSet(); SQLiteDataAdapter Da = new SQLiteDataAdapter(Command); Da.Fill(ds); DataTable dt = ds.Tables[0]; bool PositionExists; if (dt.Rows.Count > 0) { PositionExists = true; } else { PositionExists = false; } if (PositionExists) { //dt.Rows[0].Field<>("Date") } Here the "Date" field is a BLOB. My question is, a. Will reading through the DataAdapter create any problems later on, when I am working with BLOBS? More, specifically, will it read the BLOB properly? b. This was the read part.Now when I am writing the BLOB to the DB,its a queue actually. I.e I am trying to store a queue in MySQLite using a BLOB. Will Conn.ExecuteNonQuery() serve my purpose? c. When I am reading the BLOB back from the DB, can I edit it as the original datatype, it used to be in C# environment i.e { Queue - BLOB - ? } {C# -MySQL - C# } So in this context, Date field was a queue, I wrote it back as a BLOB, when reading it back, can I access it(and edit) as a queue? Thank You. Soham

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• Pros and cons of making database IDs consistent and "readable"

  - by gmale

  Question Is it a good rule of thumb for database IDs to be "meaningless?" Conversely, are there significant benefits from having IDs structured in a way where they can be recognized at a glance? What are the pros and cons? Background I just had a debate with my coworkers about the consistency of the IDs in our database. We have a data-driven application that leverages spring so that we rarely ever have to change code. That means, if there's a problem, a data change is usually the solution. My argument was that by making IDs consistent and readable, we save ourselves significant time and headaches, long term. Once the IDs are set, they don't have to change often and if done right, future changes won't be difficult. My coworkers position was that IDs should never matter. Encoding information into the ID violates DB design policies and keeping them orderly requires extra work that, "we don't have time for." I can't find anything online to support either position. So I'm turning to all the gurus here at SA! Example Imagine this simplified list of database records representing food in a grocery store, the first set represents data that has meaning encoded in the IDs, while the second does not: ID's with meaning: Type 1 Fruit 2 Veggie Product 101 Apple 102 Banana 103 Orange 201 Lettuce 202 Onion 203 Carrot Location 41 Aisle four top shelf 42 Aisle four bottom shelf 51 Aisle five top shelf 52 Aisle five bottom shelf ProductLocation 10141 Apple on aisle four top shelf 10241 Banana on aisle four top shelf //just by reading the ids, it's easy to recongnize that these are both Fruit on Aisle 4 ID's without meaning: Type 1 Fruit 2 Veggie Product 1 Apple 2 Banana 3 Orange 4 Lettuce 5 Onion 6 Carrot Location 1 Aisle four top shelf 2 Aisle four bottom shelf 3 Aisle five top shelf 4 Aisle five bottom shelf ProductLocation 1 Apple on aisle four top shelf 2 Banana on aisle four top shelf //given the IDs, it's harder to see that these are both fruit on aisle 4 Summary What are the pros and cons of keeping IDs readable and consistent? Which approach do you generally prefer and why? Is there an accepted industry best-practice?

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• Find the flaws in the concept...

  - by Trindaz

  A web based web browser. Sounds silly right? Here's a use case. All comments about what could go wrong, and if anyone has tried and failed at this, very much wanted User goes to www.theBrowser.com and logs in with credentials specific to theBrowser.com. User tells theBrowser what their username and password for various sites are User goes to theBrowser.com/?uri=somesite.com theBrowser sends off the http request with User's log in details, then sends the http response back to User. This lets theBrowser do weird and wonderful functions like change colours / style sheets / etc. to every site that gets passed through it. From a technical stand point, storing username and password and passing them along is not a challenge for one user, but if there were a few, I'd have to use some kind of server based browser software to store a session per user logged in at theBrowser.com. How could I do that? Will I have to start from scratch? Obviously privacy and security are issues. Would theBrowser.com be too great a risk, even if users are fully warned? Cheers, Dave

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• Google Analytics API Authentication Speedup

  - by Paulo

  I'm using a Google Analytics API Class in PHP made by Doug Tan to retrieve Analytics data from a specific profile. Check the url here: http://code.google.com/intl/nl/apis/analytics/docs/gdata/gdataArticlesCode.html When you create a new instance of the class you can add the profile id, your google account + password, a daterange and whatever dimensions and metrics you want to pick up from analytics. For example i want to see how many people visited my website from different country's in 2009. //make a new instance from the class $ga = new GoogleAnalytics($email,$password); //website profile example id $ga->setProfile('ga:4329539'); //date range $ga->setDateRange('2010-02-01','2010-03-08'); //array to receive data from metrics and dimensions $array = $ga->getReport( array('dimensions'=>('ga:country'), 'metrics'=>('ga:visits'), 'sort'=>'-ga:visits' ) ); Now you know how this API class works, i'd like to adress my problem. Speed. It takes alot of time to retrieve multiple types of data from the analytics database, especially if you're building different arrays with different metrics/dimensions. How can i speed up this process? Is it possible to store all the possible data in a cache so i am able to retrieve the data without loading it over and over again?

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• What are the primitive Forth operators?

  - by Barry Brown

  I'm interested in implementing a Forth system, just so I can get some experience building a simple VM and runtime. When starting in Forth, one typically learns about the stack and its operators (DROP, DUP, SWAP, etc.) first, so it's natural to think of these as being among the primitive operators. But they're not. Each of them can be broken down into operators that directly manipulate memory and the stack pointers. Later one learns about store (!) and fetch (@) which can be used to implement DUP, SWAP, and so forth (ha!). So what are the primitive operators? Which ones must be implemented directly in the runtime environment from which all others can be built? I'm not interested in high-performance; I want something that I (and others) can learn from. Operator optimization can come later. (Yes, I'm aware that I can start with a Turing machine and go from there. That's a bit extreme.) Edit: What I'm aiming for is akin to bootstrapping an operating system or a new compiler. What do I need do implement, at minimum, so that I can construct the rest of the system out of those primitive building blocks? I won't implement this on bare hardware; as an educational exercise, I'd write my own minimal VM.

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• F# Class with Generics : 'constructor deprecated' error

  - by akaphenom

  I am trying to create a a class that will store a time series of data - organized by groups, but I had some compile errors so I stripped down to the basics (just a simple instantiation) and still can't overcome the compile error. I was hoping some one may have seen this issue before. Clas is defined as: type TimeSeriesQueue<'V, 'K when 'K: comparison> = class val private m_daysInCache: int val private m_cache: Map<'K, 'V list ref > ref; val private m_getKey: ('V -> 'K) ; private new(getKey) = { m_cache = ref Map.empty m_daysInCache = 7 ; m_getKey = getKey ; } end So that looks OK to me (it may not be, but doesnt have any errors or warnings) - the instantiation gets the error: type tempRec = { someKey: string ; someVal1: int ; someVal2: int ; } let keyFunc r:tempRec = r.someKey // error occurs on the following line let q = new TimeSeriesQueue<tempRec, string> keyFunc This construct is deprecated: The use of the type syntax 'int C' and 'C ' is not permitted here. Consider adjusting this type to be written in the form 'C' NOTE This may be simple stupidity - I am just getting back from holiday and my brain is still on time zone lag...

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• Sorting ArrayList - IndexOutOfBoundsException -Java

  - by FILIaS

  I'm trying to sort an ArrayList with strings(PlayersNames) and imageIcons(PlayersIcons) based on the values i store in an other arrayList with integers(results). As you can see i get an indexOutOfBoundsException but i cant understand why. Maybe the earling of the morning makes me not to see plain things. ArrayList<String> PlayersNames=new ArrayList<String>; ArrayList<ImageIcon> PlayersIcons=new ArrayList<ImageIcons>; public void sortPlayers(ArrayList<Integer> results){ String tmp; ImageIcon tmp2; for (int i=0; i<PlayersNames.size(); i++) { for (int j=PlayersNames.size(); j>i; j--) { if (results.get(i) < results.get(i+1) ) { //IndexOutOfBoundsException! tmp=PlayersNames.get(i+1); PlayersNames.set(i+1,PlayersNames.get(i)); PlayersNames.set(i,tmp); tmp2=PlayersIcons.get(i+1); PlayersIcons.set(i+1,PlayersIcons.get(i)); PlayersIcons.set(i,tmp2); } } } }

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