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• Need some advice on Core Data modeling strategy

  - by Andy

  I'm working on an iPhone app and need a little advice on modeling the Core Data schema. My idea is a utility that allows the user to speed-dial their contacts using user-created rules based on the time of day. In other words, I would tell the app that my wife is commuting from 6am to 7am, at work from 7am to 4pm, commuting from 4pm to 5pm, and home from 5pm to 6am, Monday through Friday. Then, when I tap her name in my app, it would select the number to dial based on the current day and time. I have the user interface nearly complete (thanks in no small part to help I've received here), but now I've got some questions regarding the persistent store. The user can select start- and stop-times in 5-minute increments. This means there are 2,016 possible "time slots" in week (7 days * 24 hours * 12 5-minute intervals per hour). I see a few options for setting this up. Option #1: One array of time slots, with 2,016 entries. Each entry would be a dictionary containing a contact identifier and an associated phone number to dial. I think this means I'd need a "Contact" entity to store the contact information, and a "TimeSlot" entity for each of the 2,016 possible time slots. Option #2: Each Contact has its own array of time slots, each with 2,016 entries. Each array entry would simply be a string indicating which phone number to dial. Option #3: Each Contact has a dictionary of time slots. An entry would only be added to the dictionary for time slots with an active rule. If a search for, say, time slot 1,299 (Friday 12:15pm) didn't find a key @"1299" in the dictionary, then a default number would be dialed instead. I'm not sure any of these is the "right" way or the "best" way. I'm not even sure I need to use Core Data to manage it; maybe just saving arrays would be simpler. Any input you can offer would be appreciated.

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• MS Query Analyzer / Management Studio replacement?

  - by kprobst

  I've been using SQL Server since version 6.5 and I've always been a bit amazed at the fact that the tools seem to be targeted to DBAs rather than developers. I liked the simplicity and speed of the Query Analyzer for example, but hated the built-in editor, which was really no better than a syntax coloring-capable Notepad. Now that we have Management Studio the management part seems a bit better but from a developer standpoint the tools is even worse. Visual Studio's excellent text editor... without a way to customize keyboard bindings!? Don't get me started on how unusable is the tree-based management hierarchy. Why can't I re-root the tree on a list of stored procs for example the way the Enterprise Manager used to allow? Now I have a treeview that needs to be scrolled horizontally, which makes it eminently useless. The SQL server support in Visual Studio is fantastic for working with stored procedures and functions, but it's terrible as a general ad hoc data query tool. I've tried various tools over the years but invariably they seem to focus on the management side and shortchange the developer in me. I just want something with basic admin capabilities, good keyboard support and requisite DDL functionality (ideally something like the Query Analyzer). At this point I'm seriously thinking of using vim+sqlcmd and a console... I'm that desperate :) Those of you who work day in and day out with SQL Server and Visual Studio... do you find the tools to be adequate? Have you ever wished they were better and if you have found something better, could you share please? Thanks!

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• Silverlight - how to render image from non-visible data bound user control?

  - by MagicMax

  Hello! I have such situation - I'd like to build timeline control. So I have UserControl and ItemsControl on it (every row represents some person). The ItemsControl contains another ItemsControl as ItemsControl.ItemTemplate - it shows e.g. events for the person arranged by event's date. So it looks as some kind of grid with dates as a column headers and e.g. peoples as row headers. ........................|.2010.01.01.....2010.01.02.....2010.01.03 Adam Smith....|......[some event#1].....[some event#2]...... John Dow.......|...[some event#3].....[some event#4]......... I can have a lot of persons (ItemsControl #1 - 100-200 items) and a lot of events occured by some day (1-10-30 events per person in one day) the problem is that when user scrolls ItemsControl #1/#2 it happened toooo sloooooowwww due to a lot of elements should be rendered in one time (as I have e.g. a bit of text boxes and other elements in description of particular event) Question #1 - how can I improve it? May be somebody knows better way to build such user control? I have to mention that I'm using custom Virtual panel, based on some custom Virtual panel implementation found somewhere in internet... Question #2 - I'd like to make image with help of WriteableBitmap and render data bound control to image and to show image instead of a lot of elements. Problem is that I'm trying to render invisible data bound control (created in code behind) and it has actualWidth/Height equals to zero (so nothing rendered). How can I solve it? Thank you very much for you help!

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• Planning management slots/sessions

  - by Glide

  I have a planning structure on two tables to store available slots by day, and sessions. A slot is defined by a range of time in the day. CREATE TABLE slot ( `id` int(11) NOT NULL AUTO_INCREMENT , `date` date , `start` time , `end` time ); Sessions can't overlap themselves and must be wrapped in a slot. CREATE TABLE session ( `id` int(11) NOT NULL AUTO_INCREMENT , `date` date , `start` time , `end` time ); I need to generate a list of available blocks of time of a certain duration, in order to create sessions. Example: INSERT INTO slot (date, start, end) VALUES ("2010-01-01", "10:00", "19:00") , ("2010-01-02", "10:00", "15:00") , ("2010-01-02", "16:00", "20:30") ; INSERT INTO slot (date, start, end) VALUES ("2010-01-01", "10:00", "19:00") , ("2010-01-02", "10:00", "15:00") , ("2010-01-02", "16:00", "20:30") ; 2010-01-01 <##><####> <- Sessions ------------------------------------ <- Slots 10 11 12 13 14 15 16 17 18 19 20 2010-01-02 <##########> <########> <- Sessions -------------------- ------------------ <- Slots 10 11 12 13 14 15 16 17 18 19 20 I need to know which spaces of 1 hour I can use: +------------+-------+-------+ | date | start | end | +------------+-------+-------+ | 2010-01-01 | 13:00 | 14:00 | | 2010-01-01 | 14:00 | 15:00 | | 2010-01-01 | 15:00 | 16:00 | | 2010-01-01 | 16:00 | 17:00 | | 2010-01-01 | 17:00 | 18:00 | | 2010-01-01 | 18:00 | 19:00 | | 2010-01-02 | 10:00 | 11:00 | | 2010-01-02 | 11:00 | 12:00 | | 2010-01-02 | 16:00 | 17:00 | +------------+-------+-------+

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• Moral fits the story or suggest me a nice moral?

  - by Gobi

  A 25 year old son was sitting beside his old father in a train one day. When the train was about to leave, all the passengers started settling down in their seats. The son was filled with joy and anxiety. He was seated by the window. He put his hand out and felt the breeze and screamed, “ Papa look at all the trees, they are moving behind”. The old father smiled and admired his son’s feelings. Beside the old man, a couple was also travelling and observed this strange behavior. They found something awkward and childish in the behavior of this 25 year old man. All of a sudden, the son shouted again “Papa see! The clouds are moving about; there is a pond down and many cows are drinking it’s water”. It soon started drizzling. Once again, the young man felt exited and said “papa, I can see and feel the rain drops touching my hand”. The couple seeing this and feeling concerned, asked the old man “why don’t you consult a good doctor and treat your son; don’t you find something abnormally different in him ?” The old man replied, “Yes, I have provided the best treatment for my only boy. We are just returning from the hospital. I am happy for today is the day he has received his sense of sight. It’s for the first time my son is seeing and relishing these little wonders which we have been watching and ignoring in our routine life!” The couple had no words to reply and felt sorry for their remarks. Moral of the story: “ “don’t judge a book by its cover”. is this the moral fits the story or provide me some moral for this story :)

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• Merging changes to a workspace with uncommitted changes

  - by Kim L

  We've just recently switched over from SVN to Mercurial, but now we are running into problems with our workflow. Example I have my local clone of the repository which I work on. I'm making some highly experimental changes to our code base, something that I don't want to commit before I'm sure it works the way it is supposed to, I don't want to commit it even locally. Now, simultaneously, my co-worker has made some significant improvements/bug fixes which I need. He pushes his commits to our main repository. The question is, how can I merge his changes to my workspace without the requirement that I have to commit all my changes, since I need his changes to test my own code? A more day-to-day problem we have with the exact same workflow is where we have a couple of configuration files which are in the repository. Each developer makes a couple of small environment specific changes to the configuration files, but do not commit the changes. These couple of uncommitted files hinders us from making any merges to our workspace, just like with the example above. Ideally, the configuration files probably shouldn't be in the repository, unfortunately, that's just how it has to be for here unnamed reasons.

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• What is your preferred tool stack for PHP development in the Windows Environment?

  - by Tim Visher

  I have been developing basic web sites for awhile now with some PHP thrown in for getting dynamic stuff done. However, I recently decided that it was time I got my hands a little dirtier so I wanted to start to play with the underpinnings of Wordpress and other such apps. I work on a Mac at home and have been using Coda for most of my editing needs and I love it. Also, to manage the services stack I use MAMP at home. However, I've begun to realize that for heavy PHP and Web work (AJAX, etc.), more is needed. I'm very interested to hear the kinds of tools more experienced web developers use on a day to day basis to manage the entire work flow. I found this article over on developer tutorials and decided to go with XAMPP (for the moment) for managing the services. However, IDE, Source Control, Debugger, etc. are all up for grabs. Anyway, your thoughts are much appreciated. And, if at all possible, try to describe your entire stack with what each tool fulfills for your development process.

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• How can I work around SQL Server - Inline Table Value Function execution plan variation based on par

  - by Ovidiu Pacurar

  Here is the situation: I have a table value function with a datetime parameter ,lest's say tdf(p_date) , that filters about two million rows selecting those with column date smaller than p_date and computes some aggregate values on other columns. It works great but if p_date is a custom scalar value function (returning the end of day in my case) the execution plan is altered an the query goes from 1 sec to 1 minute execution time. A proof of concept table - 1K products, 2M rows: CREATE TABLE [dbo].[POC]( [Date] [datetime] NOT NULL, [idProduct] [int] NOT NULL, [Quantity] [int] NOT NULL ) ON [PRIMARY] The inline table value function: CREATE FUNCTION tdf (@p_date datetime) RETURNS TABLE AS RETURN ( SELECT idProduct, SUM(Quantity) AS TotalQuantity, max(Date) as LastDate FROM POC WHERE (Date < @p_date) GROUP BY idProduct ) The scalar value function: CREATE FUNCTION [dbo].[EndOfDay] (@date datetime) RETURNS datetime AS BEGIN DECLARE @res datetime SET @res=dateadd(second, -1, dateadd(day, 1, dateadd(ms, -datepart(ms, @date), dateadd(ss, -datepart(ss, @date), dateadd(mi,- datepart(mi,@date), dateadd(hh, -datepart(hh, @date), @date)))))) RETURN @res END Query 1 - Working great SELECT * FROM [dbo].[tdf] (getdate()) The end of execution plan: Stream Aggregate Cost 13% <--- Clustered Index Scan Cost 86% Query 2 - Not so great SELECT * FROM [dbo].[tdf] (dbo.EndOfDay(getdate())) The end of execution plan: Stream Aggregate Cost 4% <--- Filter Cost 12% <--- Clustered Index Scan Cost 86%

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• Suitable ESXi Spec

  - by Canacourse

  Finally I have some money to buy a new server and replace the one I have been using for 10 years. Im thinking of running ESXi on the new server. And intend to use it as follows; One W2008 R2 Guest running Exchange, File store, SVN and an accounting application for day to day running of the company. Multiple Guest VMs W2K, XP, Vista & WIN7 that were setup for testing in-house & real customer images also for testing. Probably Two Server Guest Os's W2003 & W2008 running at the same time again for testing. One Guest VM for builds & Continuous integration. Possibly one Guest running W220R2 for a customer website (Portal) This server will have to last another 10 years so I want to get the spec right. Althought I am clear on the memory and disk requirments I am not so clear on the processor(s). Im thinking of 2 Quadcore processors but welcome advice on this. Proposed Spec 10GB Ram 2TB Sata Drives (Hardware Raid 1) 2 Processors (TBC) Normally 3 Server VM's will running concurrently and the other VMs will be started as required. Max expected VMs running about 7. Max users = 4. TIA..

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• For the professional programmers - do you still write code for fun at home ? [closed]

  - by Led

  Possible Duplicate: Do you ever code just for fun? I've been working as a 'professional' coder for about 11 years. (I've just turned 33.) When I talk to my collegues, I find that most of them actually don't program any more in their spare time - 8 (or 10 :)) hours a day at their job is enough for them. A difference between me and them might be that I was always programming for fun (demoscene stuff etc.) which is why I got into the field, while most of them picked up programming later on (at university or whatever). When I get home my head is always full of ideas, so usually I have a hobby-project going on. Is it weird to spend 8 hours a day programming, and then get home, have dinner, and do some more ? For me the reasons are just - ideas : trying stuff - wanting to develop something all by myself, so when it's finished I can claim it as my own victory How about you ? And if you do, do you have other reasons to do so ? Edit: And if you've got sparetime projects, it might be fun to tell us a bit about it :) Spamming a link to your site/hobbyproject won't be frowned upon here ! Edit2: Vote for this if you want to encourage companies to make monitors that'll give you a nice tan ! ;-)

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• Tool for generating flat files from SQL objects dynamically

  - by Fabio Gouw

  Hello! I'm looking for a tool or component that generates flat files given a SQL Server's query result (from a stored procedure or a SELECT * over a table or view). This will be a batch process which runs every day, and every day a new file is created. I could use SQL Server Integration Services (DTS), but I have a mandatory requirement: the output of the file need to be dynamic. If a new column is added in my query result, the file must have this new column too, without having to modify my SSIS package. If a column is removed, then the flat file no longer will have it. I’ve tried to do this with SSIS, but when I create a new package I need to specify the number of columns. Another requirement is configuring the format of the output, depending on the data type of the column. If it’s a datetime, the format needs to be YYYY-MM-DD. If it’s a float, then I need to use 2 decimal digits, and so on. Does anyone know a tool that does this job? Thanks

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• DotNetOpenAuth occasionally throws a NotImplementedException

  - by Chris Moschini

  I have DotNetOpenAuth running on a background thread making calls to Google authorized with OAuth on a regular basis. About once a day, which is about one in 10,000 calls, I get the following Exception: An unhandled exception occurred and the process was terminated. Application ID: DefaultDomain Process ID: 3316 Exception: System.NotImplementedException Message: The method or operation is not implemented. StackTrace: at DotNetOpenAuth.Messaging.ProtocolException.GetObjectData(SerializationInfo info, StreamingContext context) in c:\Users\andarno\git\dotnetopenid\src\DotNetOpenAuth\Messaging\ProtocolException.cs:line 90 at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder) at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder) at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck) at System.Runtime.Remoting.Channels.CrossAppDomainSerializer.SerializeObject(Object obj, MemoryStream stm) at System.AppDomain.Serialize(Object o) at System.AppDomain.MarshalObject(Object o) If it was thrown and caught once a day I'd be fine, but this is a big one - I'm getting this in the Application Error log on the server, and it's crashing the process entirely - the site goes down and restarts. Has anyone else run into this? Something I'm clearly doing wrong?

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• how to bind the converted value from a datatable to my gridview.

  - by Ranjana

  how to bind the value to gridview i have a datatable DataTable dtBindGrid = new DataTable(); dtBindGrid = serviceobj.SelectExamTimeTable(txtSchoolName.Text, txtBranchName.Text, txtClass.Text, txtExamName.Text); foreach (DataRow row in dtBindGrid.Rows) { strgetday= row["Day"].ToString(); strgetdate = row["Date"].ToString(); DatedTime = Convert.ToDateTime(row["Time"].ToString()); strgettime = DatedTime.ToString("t"); strgetsubject = row["Subject"].ToString(); strgetduration = row["Duration"].ToString(); strgetsession = row["Session"].ToString(); strgetminmark = row["MinMarks"].ToString(); strgetmaxmark = row["MaxMarks"].ToString(); // dtBindGrid.Rows.Add(row); } GrdExamTimeTable.DataSource = dtBindGrid.DefaultView; GrdExamTimeTable.DataBind(); this datatable will return me some values like day,date,time,duration,subject,.. here im getting each value in string bec to convert the Time as 9.00am or 9.00pm DatedTime = Convert.ToDateTime(row["Time"].ToString()); strgettime = DatedTime.ToString("t"); .... how to bind this converted value to my gridview.

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• [iphone,twitter] Accessing the Twitter API through a proxy using NSURLConnectionsm, OAuth problem

  - by akaii

  I'm having no problems with sending an update directly via hxxps://api.twitter.com/, but the app (for the Iphone, I'm using NSURLConnections) I'm working is supposed to allow the user to select a preferred proxy (e.g. hxxps://twitter-proxy.appspot.com/api/ or hxxps://nest.onedd.net/api/), and I keep getting a 401 error (Failed to validate oauth signature and token) whenever I try to get an access token via these proxies. Even though I send my POST request to the proxy, I am still using the direct url for the api (https:// api.twitter.com/[rest api path]) in the base string. Despite the 401 error message above, the status code I'm actually getting from connection:didReceiveResponse: is 200, probably because it was able to successfully contact the proxy... Is there anything else that I need to consider when using a proxy to access the API? Should anything in the authorization header change, for example? Or the base string? I can manage to connect via Basic Auth without issue, but support for that will be dropped in a month. On a somewhat unrelated note... What are the possible causes of Twitter's error 403, and how do you distinguish between them? Is the only way to differentiate an error due to exceeding the status update limit for an hour (150 per hour) vs for a day (1000 per day) by checking the string reply returned in the response? Is there any way for me to simulate a status update limit error without going through the motions of actually sending 150/1000 tweets?

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• A Digg-like rotating homepage of popular content, how to include date as a factor?

  - by Ferdy

  I am building an advanced image sharing web application. As you may expect, users can upload images and others can comments on it, vote on it, and favorite it. These events will determine the popularity of the image, which I capture in a "karma" field. Now I want to create a Digg-like homepage system, showing the most popular images. It's easy, since I already have the weighted Karma score. I just sort on that descendingly to show the 20 most valued images. The part that is missing is time. I do not want extremely popular images to always be on the homepage. I guess an easy solution is to restrict the result set to the last 24 hours. However, I'm also thinking that in order to keep the image rotation occur throughout the day, time can be some kind of variable where its offset has an influence on the image's sorting. Specific questions: Would you recommend the easy scenario (just sort for best images within 24 hours) or the more sophisticated one (use datetime offset as part of the sorting)? If you advise the latter, any help on the mathematical solution to this? Would it be best to run a scheduled service to mark images for the homepage, or would you advise a direct query (I'm using MySQL) As an extra note, the homepage should support paging and on a quiet day should include entries of days before in order to make sure it is always "filled" I'm not asking the community to build this algorithm, just looking for some advise :)

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• jQuery JSON .each problem

  - by Aran

  I have a JSON object that looks like this. [ { "id" : "23", "event_id" : "0", "sport_title" : null, "event_title" : null, "title" : "Under 1 day!", "content" : "It\\'s all hotting up and battle commences in under one day!", "link" : "" }, { "id" : "20", "event_id" : "0", "sport_title" : null, "event_title" : null, "title" : "Getting Exciting", "content" : "Less than two days till it all kicks off, with cricket....", "link" : "" }] and I am trying to get the details out of this JSON Object and prepend them to a <ul> the code that I am currently trying looks like this and is having problems var writeup_list = writeuplist; $.getJSON('../json/getWriteups.json', function(data) { $.each(data.items, function(i, item) { writeup_list.html(function() { var output; output = '<li><a href="/writeups/index.php#writeup_' + item.id + '">'; if(item.sport_title != null) { output += item.sport_title + ' - '; } output += item.title + '</a></li>'; return output; }); }); }); writeuplist is just the ul object. I am also worried about overriding information that is already in the list or just adding again. Don't want to keep adding the same data. What is a good way to avoid this? I seem to be having a problem in getting the data out of the JSON file I believe it has something to do with the way am trying to access it in the .each function. Can anyone spot where am going wrong?

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• Using MongoDB's map/reduce to "group by" two fields

  - by ibz

  I need something slightly more complex than the examples in the MongoDB docs and I can't seem to be able to wrap my head around it. Say I have a collection of objects of the form {date: "2010-10-10", type: "EVENT_TYPE_1", user_id: 123, ...} Now I want to get something similar to a SQL GROUP BY query, grouping over both date and type. That is, I want the number of events of each type in each day. Also, I'd like to make it unique by user_id, ie. if a user has more events in the same day, count it only once. I'm trying to do this with map/reduce. I do db.logs.mapReduce(function() { emit(this.type, 1); }, function(k, vals) { var total = 0; for (var i = 0; i < vals.length; i++) total += vals[i]; return total; }}) which nicely groups by type, but now, how can I group by date at the same time? Seems the key in emit() can't be an array (I thought about doing emit([this.date, this.type], 1)). Also, how can I ensure the per-user uniqueness? I'm just starting with MongoDB and I'm still having trouble grasping the basic concepts. Also, there is not much documentation available out there. Any help from more experienced users is appreciated. Thanks!

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• how to prevent divs from overlapping when using no-wrap across table cells

  - by pedalpete

  I'm trying to create an events calendar which has a somewhat 'gantt' chart like bar representing the times of an event, along with the time listed. I've uploaded a page showing the problem As you can see, the problem is that in the 3rd cell, the event div is being overlapped by the previous event div which goes outside the boundary of the cell. The event from the 2nd cell SHOULD expand beyond the cell border, but what I'm trying to get to happen is that WHEN the event from the 2nd cell expands into the 3rd cell, the event on the 3rd cell starts a new line. I believe the problem exists because of the nowrap on the time, but I want the time and in some cases the bar to cross the cell boundary when the time goes from one day to another. All that works now, but I'm having a problem with events overlapping when an event goes from one day to another. I've tried all sorts of :even cells having a different padding, etc. but all these solutions seem to bring up more problems. Is there a way get the no-wrap to force a new long when it crosses into the next cell? or any other solution to this issue?

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• Deselect dates in ASP.NET Calendar Control

  - by yomismo

  I'm trying to select and de-select dates on a C# Web Calendar control. The problem I have is that I can select or deselect dates except when there is only a single date selected. Clicking on it does not trigger the selection changed event, so Ineed to do something on the dayrender event but I'm not sure what or how. Edit: Added the Pre_Render event code. This seems to work now, however it seems a little bit erratic,e.g. select date A : OK Select date B :OK deselect them both: OK select date A: Does not work, need to select it twice deselect date A : Ok Select Date C: dates A and c are selected @John Yes, I am aware that the control is part of the .NET 2.0 framework and nothing to do with C# per se. Code so far: public static List<DateTime> list = new List<DateTime>(); protected void Calendar1_DayRender(object sender, DayRenderEventArgs e) { if (e.Day.IsSelected == true) { list.Add(e.Day.Date); } Session["SelectedDates"] = list; } protected void Calendar1_SelectionChanged(object sender, EventArgs e) { DateTime selection = Calendar1.SelectedDate; if (Session["SelectedDates"] != null) { List<DateTime> newList = (List<DateTime>)Session["SelectedDates"]; foreach (DateTime dt in newList) { Calendar1.SelectedDates.Add(dt); } if (searchdate(selection, newList)) { Calendar1.SelectedDates.Remove(selection); } list.Clear(); } } public bool searchdate(DateTime date, List<DateTime> dates) { var query = from o in dates where o.Date == date select o; if (query.ToList().Count == 0) { return false; } else { return true; } } protected void Calendar1_PreRender(object sender, EventArgs e) { if (Calendar1.SelectedDates.Count == 1) { foreach (DateTime dt in list) { if (searchdate(dt, list) && list.Count == 1) { Calendar1.SelectedDates.Clear(); break; } } } }

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• How to deal with "partial" dates (2010-00-00) from MySQL in Django?

  - by Etienne

  In one of my Django projects that use MySQL as the database, I need to have a date fields that accept also "partial" dates like only year (YYYY) and year and month (YYYY-MM) plus normal date (YYYY-MM-DD). The date field in MySQL can deal with that by accepting 00 for the month and the day. So 2010-00-00 is valid in MySQL and it represent 2010. Same thing for 2010-05-00 that represent May 2010. So I started to create a PartialDateField to support this feature. But I hit a wall because, by default, and Django use the default, MySQLdb, the python driver to MySQL, return a datetime.date object for a date field AND datetime.date() support only real date. So it's possible to modify the converter for the date field used by MySQLdb and return only a string in this format 'YYYY-MM-DD'. Unfortunately the converter use by MySQLdb is set at the connection level so it's use for all MySQL date fields. But Django DateField rely on the fact that the database return a datetime.date object, so if I change the converter to return a string, Django is not happy at all. Someone have an idea or advice to solve this problem? How to create a PartialDateField in Django ? EDIT Also I should add that I already thought of 2 solutions, create 3 integer fields for year, month and day (as mention by Alison R.) or use a varchar field to keep date as string in this format YYYY-MM-DD. But in both solutions, if I'm not wrong, I will loose the special properties of a date field like doing query of this kind on them: Get all entries after this date. I can probably re-implement this functionality on the client side but that will not be a valid solution in my case because the database can be query from other systems (mysql client, MS Access, etc.)

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• How to estimate tomcat server requirements?

  - by Daniil

  We have a brand new webapp written that runs on Tomcat. So far, only one client is using it through the day. They run about 180 unique logins a day. Not really a lot IMO. Now, we managed to sell it to a brand new client who likes and wants to roll it out to 50,000 clients. How many of them will login at the same time - no idea. But I need to do the whole thing - allocate, create, config and maintain. OK - last is simple(errrr). The application runs off of Tomcat 5.5 on Gentoo (I'm thinking to upgrade to Tomcat 6) with MSSQL & mySQL behind. I do realize that a more enterprise ready application would be a better fit, but that's not an option at the moment. Since I've never done this before, I'm a bit lost. Can someone advice on how to go about estimating the equipment requirements for this client? Tomcat does have clustering, so that I can do. MS SQL - I'm sure they have something too. I'm thinking to stick it behind LVS (which we do use at the moment for something else too). Any help from people who deal with these details is greatly appreciated!

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• questions about using svn

  - by ajsie

  i have set up a svn repository in a remote ubuntu server using webdav (http://ip/svn). but i have some questions: should i create one svn repository for each project folder? so i should use "svnadmin create" 5 times for 5 projects? or should i import them to seperate folders in the svn repository? should i after i have created a svn repo, import one project folder into it with "svn import" and then DELETE my original local folder thus only having it in the svn repo in the remote ubuntu server? is this safe or should i still have a local copy for some reason (cause i wont work in that one)? i use netbeans to check out projects from svn repo, then i edit the files and commit the changes. but how should i do to update the live web server content (in /var/www)? should i in my ubuntu server use "svn checkout" and check it out to /var/www or should i use netbeans to check out to a local folder and then upload the files to /var/www with ftp or webdav (and which one of them should i use)? so i got a svn repo and lets say 4 programmers are working with it, checking out and commiting. how do i check what is happening in the repo, which one made which changes, and all the changes from day 1 to day 213? does netbeans/eclipse letting me see this kind of information or do i download another application for it? i should have one svn user for each programmer in the ubuntu server? is this accomplished by using "htpasswd" 4 times for 4 programmers? how do i couple all these users to same group so that i could modify file access specific for the svn group and all its members?

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• haml - if-else with different identations

  - by egarcia

  Hi everyone, I'm trying to render a calendar with rails and haml. The dates used come from a variable called @dates. It is a Date range that contains the first and last days to be presented on the calendar. The first day is always sunday and the last one is always monday. I'm planning to render a typical calendar, with one column per weekday (sunday is going to be the first day of the week) using an html table. So, I need to put a %tr followed by a %td on sundays, but the rest of the days I just need a %td. I'm having trouble modelling that on haml. This seems to require different levels of identation, and that's something it doesn't like. Here's my failed attempt: %table %tr %th= t('date.day_names')[0] # Sunday %th= t('date.day_names')[1] %th= t('date.day_names')[2] %th= t('date.day_names')[3] %th= t('date.day_names')[4] %th= t('date.day_names')[5] %th= t('date.day_names')[6] # Monday [email protected] do |date| - if(date.wday == 0) # if date is sunday %tr %td=date.to_s - else %td=date.to_s This doesn't work the way I want. The %tds for the non-sunday days appear outside of the %tr: <tr> <td>2010-04-24</td> </tr> <td>2010-04-25</td> <td>2010-04-26</td> <td>2010-04-27</td> <td>2010-04-28</td> <td>2010-04-29</td> <td>2010-04-30</td> I tried adding two more spaces to the else but then haml complained about improper identation. What's the best way to do this? Note: I'm not interested on rendering the calendar using unordered lists. Please don't suggest that.

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• MS Query Analizer/Management Studio replacement?

  - by kprobst

  I've been using SQL Server since version 6.5 and I've always been a bit amazed at the fact that the tools seem to be targeted to DBAs rather than developers. I liked the simplicity and speed of the Query Analizer for example, but hated the built-in editor, which was really no better than a syntax coloring-capable Notepad. Now that we have Management Studio the management part seems a bit better but from a developer standpoint the tools is even worse. Visual Studio's excellent text editor... without a way to customize keyboard bindings!? Don't get me started on how unusable is the tree-based management hierarchy. Why can't I re-root the tree on a list of stored procs for example the way the Enterprise Manager used to allow? Now I have a treeview that needs to be scrolled horizontally, which makes it eminently useless. The SQL server support in Visual Studio is fantastic for working with stored procedures and functions, but it's terrible as a general ad hoc data query tool. I've tried various tools over the years but invariably they seem to focus on the management side and shortchange the developer in me. I just want something with basic admin capabilities, good keyboard support and requisite DDL functionality (ideally something like the Query Analyzer). At this point I'm seriously thinking of using vim+sqlcmd and a console... I'm that desperate :) Those of you who work day in and day out with SQL Server and Visual Studio... do you find the tools to be adequate? Have you ever wished they were better and if you have found something better, could you share please? Thanks!

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• How to make a thread that runs at x:00 x:15 x:30 and x:45 do something different at 2:00.

  - by rmarimon

  I have a timer thread that needs to run at a particular moments of the day to do an incremental replication with a database. Right now it runs at the hour, 15 minutes past the hour, 30 minutes past the hour and 45 minutes past the hour. This is the code I have which is working ok: public class TimerRunner implements Runnable { private static final Semaphore lock = new Semaphore(1); private static final ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor(); public static void initialize() { long delay = getDelay(); executor.schedule(new TimerRunner(), delay, TimeUnit.SECONDS); } public static void destroy() { executor.shutdownNow(); } private static long getDelay() { Calendar now = Calendar.getInstance(); long p = 15 * 60; // run at 00, 15, 30 and 45 minutes past the hour long second = now.get(Calendar.MINUTE) * 60 + now.get(Calendar.SECOND); return p - (second % p); } public static void replicate() { if (lock.tryAcquire()) { try { Thread t = new Thread(new Runnable() { public void run() { try { // here is where the magic happens } finally { lock.release(); } } }); t.start(); } catch (Exception e) { lock.release(); } } else { throw new IllegalStateException("already running a replicator"); } } public void run() { try { TimerRunner.replicate(); } finally { long delay = getDelay(); executor.schedule(new TimerRunner(), delay, TimeUnit.SECONDS); } } } This process is started by calling TimerRunner.initialize() when a server starts and calling TimerRunner.destroy(). I have created a full replication process (as opposed to incremental) that I would like to run at a certain moment of the day, say 2:00am. How would change the above code to do this? I think that it should be very simple something like if it is now around 2:00am and it's been a long time since I did the full replication then do it now, but I can't get the if right. Beware that sometimes the replicate process takes way longer to complete. Sometimes beyond the 15 minutes, posing a problem in running at around 2:00am.

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