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• nHibernate one-to-many inserts but doesnt update

  - by user210713

  Instead of getting into code, I have a simple question. Default behavior for a simple one-to-many is that it inserts the child record then updates the foreign key column with the parent key. Has anyone ever had a one-to-many where the child object gets inserted but not updated resulting in a row in my table with a null in the foreign key column? I want the default behaviour for a standard one-to-many. I don't want to have to add the parent as a property to the child. Thanks.

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• bad performance from too many caught errors?

  - by Christopher Klein

  I have a large project in C# (.NET 2.0) which contains very large chunks of code generated by SubSonic. Is a try-catch like this causing a horrible performance hit? for (int x = 0; x < identifiers.Count; x++) {decimal target = 0; try { target = Convert.ToDecimal(assets[x + identifiers.Count * 2]); // target % } catch { targetEmpty = true; }} What is happening is if the given field that is being passed in is not something that can be converted to a decimal it sets a flag which is then used further along in the record to determine something else. The problem is that the application is literally throwing 10s of thousands of exceptions as I am parsing through 30k records. The process as a whole takes almost 10 minutes for everything and my overall task is to improve that time some and this seemed like easy hanging fruit if its a bad design idea. Any thoughts would be helpful (be kind, its been a miserable day) thanks, Chris

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• C# ASP.NET Update database with datatable

  - by Sir Graystar

  Scenario: I'm just trying to update my database with the changes made by the user to their information. Here is my code: SqlCommandBuilder cb = new SqlCommandBuilder(da); dt.Rows[0][2] = txtname.Text; dt.Rows[0][3] = txtinterests.Text; dt.Rows[0][4] = txtlocation.Text; da.SelectCommand = new SqlCommand(sqlcommand, conn); da.Update(dt); I know its going to be something obvious, but what have I missed? There are no errors, everything compiles correctly, but nothing happens. The record remains unchanged.

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• time difference on heroku server

  - by railsnew

  There seems to be a time difference on heroku server. >> Customer.last.id => 584 >> Customer.last.created_at => Thu, 06 May 2010 01:43:20 UTC +00:00 >> Time.zone => #<ActiveSupport::TimeZone:0x2b1dec47e5c0 @utc_offset=0, @tzinfo=#<TZInfo::DataTimezone: Etc/UTC>, @name="UTC"> >> Time.now => Wed May 05 19:05:15 -0700 2010 >> Time.now.zone => "PDT" Notice that current time is May 05 19...however, created_at date for last record is May 06 01:43. This does not make any sense. What can be causing this and how would I go about fixing this?

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• Redirects in RoR: Which one to use?

  - by scrr

  Hello, we are making a website that takes a generated incoming link and forwards the user who is clicking on it to another website while saving a record of the action in our DB. I guess it's basically what ad-services like AdSense do. However, what is the best way to redirect the user? I think html-meta-tag-redirects are out of question. So what other options are there? head :moved_permanently, :location => "http://www.domain.com/" This one is a 301-redirect. The next one is a 302: redirect_to "http://www.domain.com" Are there any others? And which is best to use for our case? The links are highly-dynamic and change all the time. We want to make sure we don't violate any existing standards and of course we don't want search-engines to tag us as spammers (which we are not, btw). Thanks!

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• Audio processing in C# or C++

  - by melculetz

  Hi, I would like to create an application that uses AI techniques and allows the user to record a part of a song and then tries to find that song in a database of wav files. I would have liked to use some already existing libraries for the audio processing part. So, could you recommend any libraries in C# which can read a wav file, get input from microphone, have some audio filters (low pass, high pass, FFT etc) and maybe have the ability to plot the audio signal as well. I would prefer to develop in C#, but if there aren't good libraries for audio processing, I guess I could work in C++ as well. As far as I know, Mathlab already has the above mentioned functionalities, but I can't use it in my application.

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• How to Display result of subquery rows as one column in MySQL?

  - by SIA

  Hi I have three tables Category, Movies and RelCatMov Category-table categoryid, categoryName 1 thriller 2 supsense 3 romantic 4 action 5 sci-fi Movies-table movieid, movieName 1 Avataar 2 Titanic 3 NinjaAssassin RelCatMov-table categoryid, MovieID 1 1 2 2 3 2 4 2 5 2 Now i Want to display a the record as MovieName Categories Titanic Suspense,Romantic,Sci-fi,action How to do this. I am writing a query select MovieName,(select categoryname from category b,relcatmov c where b.categoryid=c.categoryid and c.movieid=a.movieid) as categories from movies a; Error: Subquery returns more than one row!!! How to display the result of rows in one column? Please help!!!

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• AuthLogic perishable_token resets on every request

  - by go minimal

  In my User model I have: acts_as_authentic do |c| c.perishable_token_valid_for = 30.minutes end In my Application Controller I have the standard boilerplate code: def current_user_session return @current_user_session if defined?(@current_user_session) @current_user_session = UserSession.find end def current_user return @current_user if defined?(@current_user) @current_user = current_user_session && current_user_session.record end Now in my view I need to see if a user is logged in: <% if current_user %> Sign Out <% else %> Sign In <% end %> On every single request, current_user is being called, and that causes a SELECT call to be made to the database to find the user, then an UPDATE call that updates the last_request_at and perishable_token even though I set perishable_token_valid_for = 30.minutes. Does anyone have a better way to see if a user is logged in without causing a SELECT and UPDATE on every single page of my app. Does anyone know why the perishable token keeps updating even if I set it to be valid for 30 minutes???

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• LINQ to SQL: Issue with concurrency

  - by Gib

  I’m working on a sandwich ordering app in ASP.NET MVC, C# and LINQ to SQL. The app revolves around the user creating multiple custom-made sandwiches from a selection of ingredients. When it comes to confirming the order I need to know that there’s enough portions of each ingredient to fulfil all the sandwiches in the user’s order before I commit to the DB as it is possible that an ingredient will go out of stock between adding it to their basket and confirming the order. A bit about the database: Ingredient – Stores ingredient details including number of portions Order – Header table for an order, simply stores the order time OrderDetail – Stores a record of each sandwich in an order OrderDetailItem – Stores each ingredient in each sandwich in an order So basically I’m wondering what the best approach to ensuring that before I add records to Order, OrderDetail and OrderDetailItem I can ensure that the order can be met.

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• what causes the .NET SerialPort class DataReceived event to fire?

  - by Klay

  I understand from the MSDN docs that the event DataReceived will not necessarily fire once per byte. But does anyone know what exactly is the mechanism that causes the event to fire? Does the receipt of each byte restart a timer that has to reach, say 10 ms between bytes, before the event fires? I ask because I'm trying to write an app that reads XML data coming in from a serial port. Because my laptop has no serial ports, I use a virtual serial port emulator. (I know, I know--I can't do anything about it ATM). When I pass data through the emulated port to my app, the event fires once for each XML record (about 1500 bytes). Perfect. But when a colleague at another office tries it with two computers connected by an actual cable, the DataReceived event fires repeatedly, after every 10 or so bytes of XML, which totally throws off the app.

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• Ideas on simulating webservices for local automated testing.

  - by novice123

  I am testing an app, which talks to different webservices over the internet. For my automated testing, I don't want to go over the network. To achieve this, I need to simulate the webservice on my machine using another app. My initial thought is to record all the requests and responses between client and webservice, and then just write a simulation app which replays these responses. The disadvantage here is that everytime the webservice protocol changes a bit, I have to modify all my recorded resposnes. so I am looking to see if there are more elegant solutions. have anyone solved a similar problem? any thoughts, suggestion are appreciated.

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• How do people manage changes to common library files stored across mutiple (Mercurial) repositories?

  - by mckoss

  This is perhaps not a question unique to Mercurial, but that's the SCM that I've been using most lately. I work on multiple projects and tend to copy source code for libraries or utilities from a previous project to get a leg up on starting a new project. The problem comes in when I want to merge all the changes I made in my latest project, back into a "master" copy of those shared library files. Since the files stored in disjoint repositories will have distinct version histories, Mercurial won't be able to perform an intelligent merge if I just copy the files back to the master repo (or even between two independent projects). I'm looking for an easy way to preserve the change history so I can merge library files back to the master with a minimum of external record keeping (which is one of the reasons I'm using SVN less as merges require remembering when copies were made across branches). Perhaps I need to do a bit more up-front organization of my repository to prepare for a future merge back to a common master.

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• A table that has relation to itself issue

  - by Mostafa

  Hi , I've defined table with this schema : CREATE TABLE [dbo].[Codings]( [Id] [int] IDENTITY(1,1) NOT NULL, [ParentId] [int] NULL, [CodeId] [int] NOT NULL, [Title] [nvarchar](50) COLLATE Arabic_CI_AI NOT NULL, CONSTRAINT [PK_Codings] PRIMARY KEY CLUSTERED ( [Id] ASC )WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY] ) ON [PRIMARY] And fill it up with data like this : Id ParentId CodeId Title ----------- ----------- ----------- ---------- 1 NULL 0 Gender 2 1 1 Male 3 1 2 Female 4 NULL 0 Educational Level 5 4 1 BS 6 4 2 MS 7 4 3 PHD Now , I'm looking for a solution , in order , When i delete a record that is parent ( like Id= 1 or 4 ), It delete all child automatically ( all records that their ParentId is 1 or 4 ) . I supposed i can do it via relation between Id and Parent Id ( and set cascade for delete rule ) , But when i do that in MMS , the Delete Rule or Update Rule in Properties is disabled . My question is , What can i do to accomplish this ? Thank you

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• MySql Retrive data from same table.

  - by Muhammad Sajid

  Hi, I have a table which contains id, name, parentId of Top level Menus & their children like: -------------------------------------- id | name | parentId -------------------------------------- 1 | Color | 0 -------------------------------------- 2 | Flower | 0 -------------------------------------- 3 | Red | 1 -------------------------------------- 4 | pink | 1 -------------------------------------- 5 | Rose | 2 -------------------------------------- 6 | Lily | 2 -------------------------------------- And I want to fetch these record some thing that the resultant array must be like --------------------------------------------------------------- id | Pname | parentId | child | childId --------------------------------------------------------------- 1 | Color | 1 | Red | 3 --------------------------------------------------------------- 2 | Color | 1 | Pink | 4 --------------------------------------------------------------- 3 | Flower | 2 | Rose | 5 --------------------------------------------------------------- 4 | Flower | 2 | Lily | 6 --------------------------------------------------------------- my query was like: SELECT name AS Pname FROM myTbl WHERE id = (SELECT parentId FROM myTbl WHERE parentId = 1 ) but mysql say #1242 - Subquery returns more than 1 row Could anyone solve it. Thanks..

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• Why Jmeter is not recoring?

  - by Monika

  I am working with Jmeter2.3.2 version and trying to record a webpage. I have added http proxy server under workbench and added http request default under thread group. using port 9090 and target controller test plan - thread group. grouping - do not group samplers. After this setting i have started proxy server and opened internet browser selected manual proxy setting and added address as localhost with port 9090. the issue is Jmeter is nopt recoring anything. Please suggest it is urgent.

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• Delete all records that have no foreign key constraints

  - by Rodney Burton

  I have a SQL 2005 table with millions of rows in it that is being hit by users all day and night. This table is referenced by 20 or so other tables that have foreign key constraints. What I am needing to do on a regular basis is delete all records from this table where the "Active" field is set to false AND there are no other records in any of the child tables that reference the parent record. What is the most efficient way of doing this short of trying to delete each one at a time and letting it cause SQL errors on the ones that violate constraints? Also it is not an option to disable the constraints and I cannot cause locks on the parent table for any significant amount of time.

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• cannot read multiple rows from sqldatareader

  - by amby

  Hi, when i query for only one record/row, sqldatareader is giving correct result but when i query for multiple rows, its giving error on the client side. below is my code. please tell me what is the problem here. string query = "select * from Customer_Order where orderNumber = " + order;//+" OR orderNumber = 17"; DataTable dt = new DataTable(); Hashtable sendData = new Hashtable(); try { using (SqlConnection conn = new SqlConnection(ConnectionString)) { using (SqlCommand cmd = new SqlCommand(query, conn)) { conn.Open(); SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection); dt.Load(dr); } }

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• Can I add metadata to git commits? Or can I hide some tags in gitk

  - by Chris Nelson

  I want to associate custom metadata with a git commit. Specifically to record a review ID from a code review but it could be anything. Tags seem a natural way to do that but I expect to have a review for every commit and I don't want to clutter gitk with tons of tags. Is there some other mechanism to add custom metadata? Can I make certain tags invisible? If I could tell gitk not to display tags matching some pattern or RE, that would likely work but I don't see a way to do that.

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• Address Book is returning old values

  - by Marcus Wood

  Hi there, I am having a problem with the AddressBook framework. It all seems to be stemming from ABCopyRecordForUniqueId returning a record with old data. Example: I run up the program below in one terminal window - it shows the current data. I make a change through the address book UI - my program continues to show old data. I run up another instance of the same program in a new terminal window - it shows the updated data. I have tried posting on the omnigroup site with no luck :( so any guidance is really appreciated PS: If you would like to try the code, to get an address book ID you can export a contact as a vCard and open it with a text editor int main (int argc, const char * argv[]) { ABAddressBookRef addressBook = ABGetSharedAddressBook(); while(1) { ABRecordRef addressBookRecord = NULL; addressBookRecord = ABCopyRecordForUniqueId(addressBook, CFSTR("4064D587-0378-4DCF-A6B9-D3702F01C94C:ABPerson")); CFShow(addressBookRecord); CFRelease(addressBookRecord); sleep(1); } return 0; }

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• How can I make an SQL statement that finds unassociated records?

  - by William Calleja

  I have two tables as follows: tblCountry (countryID, countryCode) tblProjectCountry(ProjectID, countryID) The tblCountry table is a list of all countries with their codes and the tblProjectCountry table associates certain countries with certain projects. I need an SQL statement that gives me a list of the countries with their country code that do NOT have an associated record in the tblProjectCountry table. so far I got to here: SELECT tblCountry.countryID, tblCountry.countryCode FROM tblProjectCountry INNER JOIN tblCountry ON tblProjectCountry.countryID = tblCountry.countryID WHERE (SELECT COUNT(ProjectID) FROM tblProjectCountry WHERE (ProjectID = 1) AND (countryID = tblCountry.countryID)) = 0 The above statement parses as correct but doesn't give the exact result I'm looking for. Can anyone help?

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• Transactions in hibernate

  - by kumar1425

  Hi I new to hibernate In my project, i need to handle transactions. How to handle declarative transactions with in two classes Examples: //class 1 class A{ createA() { insert(A); } } //class 2 class B { createB() { insert(B); } } //class 3 @Transaction(Exception.class) class C { test() { create(A); create(B); } } As per the above code is there any possibility to handle transactions, in such a way that if the insert in classA success and the insert in the classB fails then the transaction should rollback and remove the record inserted in the table A corresponding to the Class A please help me with this using declarative transactions.... Thanks in adavace....

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• Is it impossible to secure .net code (intellectual property) ?

  - by JL

  I used to work in JavaScript a lot and one thing that really bothered my employers was that the source code was too easy to steal. Even with obfuscation, nothing really helped, because we all knew that any competent developer would be able to read that code if they wanted to. JS Scripts are one thing, but what about SOA projects that have millions invested in IP (Intellectual Property). I love .net, and especially C#, but I recently again had to answer the question "If we give this compiled program over to our clients, can their developers reverse engineer it?" I had gone out of my way to obfuscate the code, but I knew it wouldn't take that much for another determined C# developer to get at the code. So I earnestly pose the question, is it impossible to secure .net code? The considerations I have as as follows: Even regular native executables can be reversed, but not every developer has the skill to be able to do this. Its a lot harder to disassemble a native executable than a .net assembly. Obfuscation will only get you so far, but it does help a little. Why have I never seen any public acknowledgement by Microsoft that anything written in .net is subject to relatively easy IP theft? Why have I never seen a scrap of counter measure training on any Microsoft site? Why does VS come with a community obfuscater as an optional component? Ok maybe I have just had my head in the sand here, but its not exactly high on most developers priority list. Are there any plans to address my concerns in any future version of .net? I'm not knocking .net, but I would like some realistic answers, thank you, question marked as subjective and community!

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• Webforms vs. MVC. Once you start using MVC.. Do you ever go back to webforms?

  - by punkouter

  I checked out MVC months ago and didn't really get it.. but recently as I have become a better programmer I think it is making sense.. Here is my theory.. tell me if I got it Right In the 90s for Microsoft Devs we had Classic ASP. This mixed VBscript and HTML on the same page. So you needed to create all the HTML yourself and mix HTML and VBScript. This was not considered Ideal. Then .NET came along and everyone liked it because it was similiar to event driven VB 6 style programming. It created this abstraction of binding data to ASP Servier controls. It made getting Enumerated data easy to get on the screen with one line. Then recently Jquery and SOA concepts are mixed together.. Now people think.. Why create this extra layer of abstraction when I can just directly use .NET as a data provider and use jquery AJAX calls to get the data and create the HTML with it directly .. no need for the Webforms abstraction layer.. Sowe are back to creating HTML directly like we did in 1999. So MVC is all about saying Stop pretending like WEb programming is a VB6 app! Generate HTML directly! Am I missing anything? So I wonder.. for you people out there using MVC... is it the sort of things that once you get used to it you never want to go back to webforms??

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• Moving ordered elements and adding arbitrary text in Deliverance

  - by Jon Hadley

  Using the following XPath derived rule, I am able to select a list of events from a Plone site (similar to Plone Community events) and display them in my Deliverance themed site: <replace content="//*[@id='parent-fieldname-title' or @class='explain' or @id='parent-fieldname-location' or @id='parent-fieldname-text']" theme="#center-content-to-replace-one" /> However, two separate, but related, problems now rear their heads. I can't work out how to: Re-order elements within the replaced theme, such as moving images originally held within #parent-fieldname-text to before #parent-fieldname-title Put arbitrary text before elements. Such as 'Page Title:' before #parent-fieldname-title I could do both if I was just dealing with one record, as place holders(1) or text before place holders(2) could be specified in the template - but I can't see a away for that template behaviour to repeat across multiple items in one page. (if that is indeed the solution) Is this a job for pyQuery?

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• proper Django ORM syntax to make this code work in MySQL

  - by gtujan

  I have the following django code working on an sqlite database but for some unknown reason I get a syntax error if I change the backend to MySQL...does django's ORM treat filtering differently in MySQL? def wsjson(request,imei): wstations = WS.objects.annotate(latest_wslog_date=Max('wslog__date'),latest_wslog_time=Max('wslog__time')) logs = WSLog.objects.filter(date__in=[b.latest_wslog_date for b in wstations],time__in=[b.latest_wslog_time for b in wstations],imei__exact=imei) data = serializers.serialize('json',logs) return HttpResponse(data,'application/javascript') The code basically gets the latest logs from WSlog corresponding to each record in WS and serializes it to json. Models are defined as: class WS(models.Model): name = models.CharField(max_length=20) imei = models.CharField(max_length=15) description = models.TextField() def __unicode__(self): return self.name class WSLog(models.Model): imei = models.CharField(max_length=15) date = models.DateField() time = models.TimeField() data1 = models.DecimalField(max_digits=8,decimal_places=3) data2 = models.DecimalField(max_digits=8,decimal_places=3) WS = models.ForeignKey(WS) def __unicode__(self): return self.imei

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