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• iPhone - Create non-persistent entities in core data

  - by ncohen

  Hi everyone, I would like to use entity objects but not store them... I read that I could create them like this: myElement = (Element *)[NSEntityDescription insertNewObjectForEntityForName:@"Element" inManagedObjectContext:managedObjectContext]; And right after that remove them: [managedObjectContext deleteObject:myElement]; then I can use my elements: myElement.property1 = @"Hello"; This works pretty well even though I think this is probably not the most optimal way to do it... Then I try to use it in my UITableView... the problem is that the object get released after the initialization. My table becomes empty when I move it! Thanks edit: I've also tried to copy the element ([myElement copy]) but I get an error...

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• c# hierarchy collection library? - anyone know of one (e.g. GetDirectChildren, GetAllChildren, GetPa

  - by Greg

  Hi, Does anyone know of a solid C# library / approach to manage a hierarchy/web type collection? This would be a library that would basic consist of the concept of nodes & relationships, for example to model web pages/files linked under a URL, or modeling IT infrastructure. It would have key methods such as: Node.GetDirectParents() Node.GetRootParents() Node.GetDirectChildren() Node.GetAllChildren() So it's smarts would include the ability to "walk the tree" of nodes based on the relationships when someone does ask for "give me all the children under this node" for example. It ideally include a persistence layer, to save/retrieve such data to/from a databases (e.g. with a Nodes and Relationships table). Thanks

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• getting number of hours until the next event

  - by Andrew Heath

  I've got a table with this data: [ID] [event_name] [last_event] 1 stats 2011-01-01 01:47:32 last_event is a timestamp. The event occurs every 48 hours (it's a cron job). I'd like to show my users the number of hours until the event executes again. So far I've got: SELECT (lastFinish + INTERVAL 48 HOUR) FROM `cron_status` which gives me the exact time and date of the next occurence: 2011-01-03 01:47:32. So I figured if I subtracted the current datetime... SELECT ((lastFinish + INTERVAL 48 HOUR) - SYSDATE()) FROM `cron_status` which (I think?) gives me the difference in unix time: 1980015. But if I divide that by 3600 to convert the seconds to hours... SELECT (((lastFinish + INTERVAL 48 HOUR) - SYSDATE())/3600) FROM `cron_status` I get numbers an order of magnitude too high: 549.99. Where am I going wrong? The target is returning the number of hours until the next execution. Thank you!

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• Help with setting up panels in Java

  - by Milos

  I'm new to Java awt, so I am having trouble with setting up panels. I have one giant panel, which needs to hold 3 panels inside (photo is attached at the bottom). One will go on top(1), second one will be in the middle(3), and third goes on the bottom(2). Any remaining space has to be divided equally between (1)/(3) and (3)/(2). Also, the middle panel (3) is a table, so GridLayout has to be used. How can I achieve this? Thanks in advance! P.S. I've tried to draw it in MS Paint (http://i45.tinypic.com/2w523ie.jpg)

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• Slow query with unexpected scan

  - by zerkms

  Hello I have this query: SELECT * FROM SAMPLE SAMPLE INNER JOIN TEST TEST ON SAMPLE.SAMPLE_NUMBER = TEST.SAMPLE_NUMBER INNER JOIN RESULT RESULT ON TEST.TEST_NUMBER = RESULT . TEST_NUMBER WHERE SAMPLED_DATE BETWEEN '2010-03-17 09:00' AND '2010-03-17 12:00' the biggest table here is RESULT, contains 11.1M records. The left 2 tables about 1M. this query works slowly (more than 10 minutes) and returns about 800 records. executing plan shows clustered index scan over all 11M records. RESULT.TEST_NUMBER is a clustered primary key. if I change 2010-03-17 09:00 to 2010-03-17 10:00 - i get about 40 records. it executes for 300ms. and plan shows clustered index seek if i replace * in SELECT clause to RESULT.TEST_NUMBER (covered with index) - then all become fast in first case too. this points to hdd io issues, but doesn't clarifies changing plan. so, any ideas?

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• MySQL: Efficient Blobbing?

  - by feklee

  I'm dealing with blobs of up to - I estimate - about 100 kilo bytes in size. The data is compressed already. Storage engine: InnoDB on MySQL 5.1 Frontend: PHP (Symfony with Propel ORM) Some questions: I've read somewhere that it's not good to update blobs, because it leads to reallocation, fragmentation, and thus bad performance. Is that true? Any reference on this? Initially the blobs get constructed by appending data chunks. Each chunk is up to 16 kilo bytes in size. Is it more efficient to use a separate chunk table instead, for example with fields as below? parent_id, position, chunk Then, to get the entire blob, one would do something like: SELECT GROUP_CONCAT(chunk ORDER BY position) FROM chunks WHERE parent_id = 187 The result would be used in a PHP script. Is there any difference between the types of blobs, aside from the size needed for meta data, which should be negligible.

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• How to search in this activerecord example?

  - by Horace Ho

  Two models: Invoice :invoice_num string :date datetime . . :disclaimer_num integer (foreign key) Disclaimer :disclaimer_num integer :version integer :body text For each disclaimer there are multiple versions and will be kept in database. This is how I write the search (simplified): scope = Invoice.scoped({ :joins => [:disclaimer] }) scope = scope.scoped :conditions => ["Invoice.invoice_num = ?", "#{params[:num]}"] scope = scope.scoped :conditions => ["Disclaimer.body LIKE ?", "%#{params[:text]}%"] However, the above search will search again all versions of the disclaimer. How can I limit the search to only the last disclaimer (i.e. the version integer is the maximum). Please note: Invoice does not keep the version number. New disclaimers will be added to disclaimer table and keep old versions.

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• Eager loading in EF1.0

  - by Dave Swersky

  I have a many-to-many relationship: Application - Applications_Servers - Server This is set up in my Entity Data Model and all is well. My problem is that I'd like to eager-load the whole graph of Applications so that I have an IEnumerable<Applications>, each Application member populated with the Servers collection associated by the many-to-many relationship. Normally this wouldn't be a problem, but according to my research there must be a navigation property between Application and Server. This is not the case for me because my Applications_Servers join table has more in it than just the two keys. Therefore, there is no navigation property directly between Application and Server, and this doesn't work: var apps = (from a in context.Application.Include("Server") select a).ToList(); I get an error saying there is no navigation property on Application called "Server", and that's correct, there is none. How do I write the query to eager-load my Applications with their Servers in this case?

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• Contents after &amp; cannot be retrieved by xml parsing in iphone?

  - by Warrior

  I am new to iphone development.I am parsing a You tube rss feed to display its content in the table view. While retrieving the content of link tag, i am able to retrieve only half of the url and the string after & cannot be retrieved. I want to retrieve the full url so that i can use the url to load in a webview. How can i retrieve the full url ? Please help me out.The parsing is done same as Lazy tables . The orginal url is "http:www.youtube.xxxxxxxx&amp;xxxxxgdata"; The retrieved Url is "http:www.youtube.xxxxxxxx" Thanks.

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• How can I selectively override a django .count() method

  - by Tom Viner

  I'm using postGresSQL and my main table has about 20,000 rows. Sometimes count() methods can take ages or even timeout. Mod.manager.filter(...).count() I need to selectively override the count() method depending on what filter has been applied. Just having a cache of results would be a great gain but I'd like to be able to say: if filter query is just {'enabled'=True} then return 20,000 without touching the db. Note: I can't prevent the call to .count() as it's inside django's pagination, which always does a count.

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• Converting a date string which is before 1970 into a timestamp in MySQL.

  - by Jamie

  Not a very good title, so my apologies. For some reason, (i wasn't the person who did it, i digress) we have a table structure where the field type for a date is varchar. (odd). We have some dates, such as: 1932-04-01 00:00:00 and 1929-07-04 00:00:00 I need to do a query which will convert these date strings into a unix time stamp, however, in my sql if you convert a date which is before 1970 it will return 0. Any ideas? Thanks so much! EDIT: Wrong date format. ooops.

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• Adding relative week number column to MySQl results

  - by Anthony

  I have a table with 3 columns: user, value, and date. The main query returns the values for a specific user based on a date range: SELECT date, value FROM values WHERE user = '$user' AND date BETWEEN $start AND $end What I would like is for the results to also have a column indicating the week number relative to the date range. So if the date range is 1/1/2010 - 1/20/2010, then any results from the first Sun - Sat of that range are week 1, the next Sun - Sat are week 2, etc. If the date range starts on a Saturday, then only results from that one day would be week 1. If the date range starts on Thursday but the first result is on the following Monday, it would be week 2, and there are no week 1 results. Is this something fairly simple to add to the query? The only ideas I can come up with would be based on the week number for the year or the week number based on the results themselves (where in that second example above, the first result always gets week 1).

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• UITableView Edit Indentation

  - by Or.Ron

  Hi, I'm building a pretty simple UITable in my app with custom cells that I'v created. The target language is hebrew. thats why all my tabels are right to left. Everything works fine until I'm changing the table to Edit mode. I'v successfully canceled the delete and the red accessory button becuase thay are in the oppisite direction but the cell get this tiny indentation to the right and part of my cell is not showed. I tried the return NO; to the function (BOOL)tableView:(UITableView *)tableView shouldIndentWhileEditingRowAtIndexPath (NSIndexPath *)indexPath but it didn't work. any suggestions ? thanks in advance

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• Magento coupon entities in database

  - by koramaiku

  I'm trying to develop a Magento plugin which involves using coupons. Apparently after looking around I found I found a source that mentions use of a 'salesrule' table for coupons. However when I looked at my database i couldn't find it. However I did find 3 tables that had mention 'coupon' called 'coupon_aggregated', 'coupon_aggregated_order', and 'coupon_aggregated_updated'. I just wanted to know what is the difference between the 3 tables so I can start using them? I am on the latest version of Magento. Thanks guys in advance.

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• How to store and compare time-zone sensitive times

  - by Chad Moran

  I have a data structure where an entity has times stored as an int (minutes into the day) for fast comparison. The entity also has a Foreign Key reference back to a TimeZone table which contains the .NET CLR ID Name and it's Standard Time/Daylight Time acronyms. Since this information is stored as time-zone insensitive - I was wondering how in LINQ to SQL I could convert this into a UTC DateTime for comparison against other times that will be in UTC. Just to be clear this conversion has to be done server-side so that I can execute filtering on the SQL Server and not the client. I am using .NET 3.5 SP1 and SQL Server 2008.

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• Implementing Tagging using Core Data on the iPhone

  - by Jonathan Penn

  I have an application that uses CoreData and I'm trying to figure out the best way to implement tagging and filtering by tag. For my purposes, if I was doing this in raw SQLite I would only need three tables, tags, item_tags and of course my items table. Then filtering would be as simple as joining between the three tables where only items are related to the given tags. Quite straightforward. But, is there a way to do this in CoreData and utilizing NSFetchedResultsController? It doesn't seem that NSPredicate give you the ability to filter through joins. NSPredicate's aren't full SQL anyway so I'm probably barking up the wrong tree there. I'm trying to avoid reimplementing my app using SQLite without CoreData since I'm enjoying the performance CoreData gives me in other areas. Yes, I did consider (and built a test implementation) diving into the raw SQLite that CoreData generates, but that's not future proof and I want to avoid that, too. Has anyone else tried to tackle tagging/filtering with CoreData in a UITableView with NSFetchedResultsController

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• Propel: How the "Affected Rows" Returned from doUpdate is defined

  - by Ngu Soon Hui

  In propel there is this doUpdate function, that will return the numbers of affected rows by this query. The question is, if there is no need to update the row ( because the set value is already the same as the field value), will those rows counted as the affected row? Take for example, I have the following table: ID | Name | Books 1 | S1oon | Me 2 | S1oon | Me Let's assume that I write a ORM function of the equivalent of the following query: update `new table` set Books='Me' where Name='S1oon'; What will the doUpdate result return? Will it return 0 ( because all the Books column are already Me, hence there is no need to update), or will it be 2 ( because there are 2 rows that fulfill the where condition) ?

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• Sql Server Management Studio 2008 - Insert string with more than two lines

  - by gsharp

  I want to paste a string with more than two lines into a nvarchar(max) cell (right click a Table in Sql Server Management Studio 2008 -- Edit Rows). Unfortunately only the the first line of the string is pasted into the cell. I know, I could write a Insert/Update script for that, but it's not what I'm looking for. I need a quick way to paste some text into some cell. Is there a way to achieve my goal? Thanks in advance.

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• jQuery sibling selector?

  - by Brett

  Hi, I have a table which I'm trying to do a pricing list, that auto-computes the tax component.. I'm getting the value from price_1, applying a math cal, and saving it to tax_1. I could read the number of the end of the id, but hopefully there is a cleaner way with jQuery. E.g. I would have a lot of fields like.. price_1 price_2 price_3 tax_1 tax_2 tax_3 etc... I can use the following code to call jQuery on change of a price, and get the value of that price. How do I update the tax field next to it? should I use a sibling selector or something?? $('#pricing').delegate("input", "change", function(){ $(this).val() /* the value of the price */; })

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• Do I need to include all fields in my entity framework model

  - by Jim B

  Quick question for everyone: Do I need to include all the database table fields on my EF model? For example; I've created a sub-model that only deals with tblPayment and associated tables. Now, I need to write a LINQ query to get some information about items. I would typically get this by joining tblPayment to tblInvoice to tblInvoiceItem to finally tblOrderItem. I'm wondering if when I add in those other tables, do I need to include all the fields for tblInvoice and tblInvoiceItem? Ideally; I'd just like to keep the fields I'd need to join on, as that would limit the possibility of my sub-model breaking if other fields on those tables are modified/deleted. Can I do this?

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• document.write Javascript error [ SOLVED]

  - by DevMobile

  Now I'm getting the following error: ';'expected document.write("<script type='text/javascript'>var twitterwind_option = {'isOnlyMe':true,'twitterwind_logo':'','twitterwind_logo_bgcolor':'FFFFFF','twitterwind_logo_color':'333303','followers_color':'000000','followers_bgcolor':'FFFFFF','twitterwind_max_length':'39','twitterwind_username':'table-row','twitterwind_username_color':'333333','twitterwind_username_bgcolor':'FFFFFF','twitterwind_twit':'block','twitterwind_twit_color':'333333','twitterwind_twit_bgcolor':'FFFFFF','twitterwind_twit_link_color':'0084B4','twitterwind_twit_scroll_color':'C0DEED','twitterwind_twit_scroll_bg_color':'FFFFFF','twitterwind_follower':'inherit','twitterwind_follower_bgcolor':'FFFFFF','twitterwind_frame_width':200,'twitterwind_frame_height':480,'twitterwind_frame_border':'false','twitterwind_frame_border_color':'C0DEED','twitterwind_base_font_size':12,'twitterwind_me_font_size':14,'twitterwind_caption_font_size':16,'twitterwind_scroll_height':336,'eusn':'rdK1y36H5sM='}';var twitterwind_url = 'http://www.tweetswind.com/en/twitterwind.php';<\/script><script type='text/javascript' src='http://www.tweetswind.com/en/js/twitterwind.js'><\/script><div style='font-size:12px; text-align:right; width:200px'><a target='_blank' href='http://www.tweetswind.com/en/en/'>TweetsWind: a Twitter widget</a></div>");src='http://www.tweetswind.com/en/js/twitterwind.js'></script><div style='font-size:12px; text-align:right; width:200px'><a target='_blank' href='http://www.tweetswind.com/en/en/'>TweetsWind: a Twitter widget</a></div>");

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• Getting value from a texbox in asp.net

  - by user279521

  Hi, I have a web page which contains multiple panels (used to show and hide various textboxes) and one particular panel contains textboxes that is used to edit records. However, when I am attemtping to update the table, the txtVendorID.Text.Trim() is blank. SqlConnection con = new SqlConnection(strConn); string sqlUpdateVendor = "usp_Vendor_Update"; SqlCommand cmdUpdateVendor = new SqlCommand(sqlUpdateVendor, con); cmdUpdateVendor.CommandType = CommandType.StoredProcedure; cmdUpdateVendor.Parameters.Add(new SqlParameter("@RecID", SqlDbType.VarChar, 50)); cmdUpdateVendor.Parameters["@RecID"].Value = Request.QueryString["Rec_ID"]; cmdUpdateVendor.Parameters.Add(new SqlParameter("@empid", SqlDbType.VarChar, 11)); cmdUpdateVendor.Parameters["@empid"].Value = txtEmpIDNumber.Text.Trim(); cmdUpdateVendor.Parameters.Add(new SqlParameter("@VendorName", SqlDbType.VarChar, 100)); cmdUpdateVendor.Parameters["@VendorName"].Value = txtVendorName.Text.Trim(); Any idea why the textbox does not contain a value?

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• Filter records based on Date Range + ASP.NET + Regex + Javascript

  - by ASIF

  Hi I need to filter data based on a date range. My table has a field Process date. I need to filter the records and display those in the range FromDate to ToDate. How do I write a function in VB.NET which can help me filter the data. Protected Shared Function ObjectInRange(ByRef obj As Object, ByVal str1 As String, ByVal str2 As String) As Boolean Dim inRange = False For Each prop As PropertyInfo In obj.GetType().GetProperties() Dim propVal = prop.GetValue(obj, Nothing) If propVal Is Nothing Then Continue For End If Dim propValString = Convert.ToString(propVal) If Regex....WHAT GOES HERE? Then inRange = True Exit For End If Next Return inRange End Function Am I on the right track??

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• How do I do multiple has_and_belongs_to_many associations between the same two classes?

  - by Ermin

  I have the following setup: class Publication < ActiveRecord::Base has_and_belongs_to_many :authors, :class_name=>'Person', :join_table => 'authors_publications' has_and_belongs_to_many :editors, :class_name=>'Person', :join_table => 'editors_publications' end class Person < ActiveRecord::Base has_and_belongs_to_many :publications end With this setup I can do stuff like Publication.first.authors. But if I want to list all publications in which a person is involved Person.first.publications, an error about a missing join table people_publications it thrown. How could I fix that? Should I maybe switch to separate models for authors and editors? It would however introduce some redundancy to the database, since a person can be an author of one publication and an editor of another.

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• FluentNHibernate: returning an enum from a derived property

  - by Zen-C

  I'm using the automapping feature of FluentNHibernate and need a property that derives its return value. This property must return an Enum value, e.g. public virtual MyEnum MyDerivedProperty { get { MyEnum retval; // do some calculations return retval; } } Currently I get the following exception: NHibernate.PropertyNotFoundException: Could not find a setter for property 'MyDerivedProperty' ... If I add a setter then the database table involved requires the column to exist, even if that setter does nothing. It works fine when the return type is an int. Any ideas how I achieve this?

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