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• Google appengine datastore tree structure

  - by Matthew

  I need to be able to make a tree like structure in the appengine database. I have try to make an object reference itself but have not gotten it to work. class Item(db.Model): children = db.ListProperty(db.ReferenceProperty(Item))

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• NHibernate (3.1.0.4000) NullReferenceException using Query<> and NHibernate Facility

  - by TigerShark

  I have a problem with NHibernate, I can't seem to find any solution for. In my project I have a simple entity (Batch), but whenever I try and run the following test, I get an exception. I've triede a couple of different ways to perform a similar query, but almost identical exception for all (it differs in which LINQ method being executed). The first test: [Test] public void QueryLatestBatch() { using (var session = SessionManager.OpenSession()) { var batch = session.Query<Batch>() .FirstOrDefault(); Assert.That(batch, Is.Not.Null); } } The exception: System.NullReferenceException : Object reference not set to an instance of an object. at NHibernate.Linq.NhQueryProvider.PrepareQuery(Expression expression, ref IQuery query, ref NhLinqExpression nhQuery) at NHibernate.Linq.NhQueryProvider.Execute(Expression expression) at System.Linq.Queryable.FirstOrDefault(IQueryable`1 source) The second test: [Test] public void QueryLatestBatch2() { using (var session = SessionManager.OpenSession()) { var batch = session.Query<Batch>() .OrderBy(x => x.Executed) .Take(1) .SingleOrDefault(); Assert.That(batch, Is.Not.Null); } } The exception: System.NullReferenceException : Object reference not set to an instance of an object. at NHibernate.Linq.NhQueryProvider.PrepareQuery(Expression expression, ref IQuery query, ref NhLinqExpression nhQuery) at NHibernate.Linq.NhQueryProvider.Execute(Expression expression) at System.Linq.Queryable.SingleOrDefault(IQueryable`1 source) However, this one is passing (using QueryOver<): [Test] public void QueryOverLatestBatch() { using (var session = SessionManager.OpenSession()) { var batch = session.QueryOver<Batch>() .OrderBy(x => x.Executed).Asc .Take(1) .SingleOrDefault(); Assert.That(batch, Is.Not.Null); Assert.That(batch.Executed, Is.LessThan(DateTime.Now)); } } Using the QueryOver< API is not bad at all, but I'm just kind of baffled that the Query< API isn't working, which is kind of sad, since the First() operation is very concise, and our developers really enjoy LINQ. I really hope there is a solution to this, as it seems strange if these methods are failing such a simple test. EDIT I'm using Oracle 11g, my mappings are done with FluentNHibernate registered through Castle Windsor with the NHibernate Facility. As I wrote, the odd thing is that the query works perfectly with the QueryOver< API, but not through LINQ.

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• Flash AS 3.0 building a message console approach

  - by vasion

  I am having trouble figuring out how to build a console for my application so i can send msgs to it from any class in the package. i tried to send a generic Event, but I cannot find a way send a msg together with the event, or at least a reference to the object which is dispatching the event. what approach would you suggest?

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• How to do binding inside htmltext CDATA

  - by Hichem

  I couldn't find a way to bind a variable inside the htmlText property of a Text component i want to be able to do something like this : <mx:Text id="bodyText" styleName="bodyText"> <mx:htmlText > <![CDATA[<img src='assets.OrangeRect' align='left' hspace='0' vspace='4'/> Bonjour {UserData.name} ]]> </mx:htmlText> </mx:Text> i want to bind UserData.name

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• SQL Query to truncate table in IBM DB2

  - by Cshah

  Hi, Can any one give me the syntax to truncate a table in IBM DB2. I m running the following command: truncate table tableName immediate; The eror is DB2 SQL Error: SQLCODE=-104, SQLSTATE=42601, SQLERRMC=table;truncate ;JOIN , DRIVER=3.50.152 Message: An unexpected token "table" was found following "truncate ". Expected tokens may include: "JOIN ".. SQLCODE=-104, SQLSTATE=42601, DRIVER=3.50.152 The syntax matches the one specified in the reference docs of IBM : http://publib.boulder.ibm.com/infocenter/dzichelp/v2r2/index.jsp?topic=/com.ibm.db29.doc.sqlref/db2z_sql_truncate.htm

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• Accessing Sabre Web Services using PHP

  - by Peter

  I have been approached to create a website using Sabre Web Services to power the reservations system. All documentation I have seen refers to .NET or Java solutions, I was in doubt whether PHP can be used as access is performed using SOAP. I have found no further information about this, I assume the answer is yes, but wonder why there is not a single reference to this being possible - all solutions seem to be .NET Any suggestions? Thanks!

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• What is the "box model?"

  - by Chris

  During a recent interview for a front-end developer position I was asked what the box model was. I thought the interviewer was referring to testing (i.e. white box testing, black box testing). I was wrong. What is the box model, in reference to front-end development?

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• Supplying a callback to Jeditable

  - by pjmorse

  Summary: When I try supplying a onsubmit or onreset callback to Jeditable, I get Object [function] has no method 'apply' errors. How I got here: I've been working on a rails plugin to supply Jeditable and jWYSIWYG for in-place WYSIWYG editing. Development is driven by a Rails project I'm working on which asks for specific functions. One of the options I added was the ability to trigger Jeditable's edit mode using a button instead of clicking on the editable text itself, following the pattern suggested in this answer. The next step, though, is to hide the button while in edit mode, and reveal it again when leaving edit mode. The hide is easy enough; I just added a line to the triggering function which sends .toggle() to the button. Reveal is trickier. I figure I need to .toggle() again on submit or cancel, and helpfully, Jeditable offers onsubmit and onreset callbacks. However, when I try using those callbacks, I get this Object [something] has no method 'apply' errors. What I'm trying: Because this is in the context of a Rails helper, the actual mechanics are a little more involved than this, but the upshot is that I'm trying to follow this pattern, handing Jeditable this in the args: "onsubmit":"showTrigger", and then including this script: function showTrigger(settings, original) { $(".edit_trigger[id='element_id']").toggle(); } However, on submitting changes or canceling an edit, I get the error Object showTrigger has no method 'apply' ...as described above. I also tried sending in a function directly as the "onsubmit" argument (i.e. "onsubmit": "function(settings, original){$(\".edit_trigger[id='element_id']\").toggle();}" and then I just get Object function(settings, original){$(\".edit_trigger[id='element_id']\").toggle();} has no method 'apply' instead. There must be something wrong with how I'm handing in this callback. Any ideas? ETA: This answer suggests to me that somehow I'm providing a string to Jeditable when it expects a function instead. However, because I'm working within the context of a Rails helper, I'm not at all sure how to fix that - the "showTrigger" bit is set as a Ruby variable in the helper, and although window.showTrigger() is defined when the window is loaded, I don't know how to designate that function within a Ruby variable such that it will be recognized as a function at page load time.

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• When is it appropriate to use error codes?

  - by Jim Hurne

  In languages that support exception objects (Java, C#), when is it appropriate to use error codes? Is the use of error codes ever appropriate in typical enterprise applications? Many well-known software systems employ error codes (and a corresponding error code reference). Some examples include operating systems (Windows), databases (Oracle, DB2), and middle-ware products (WebLogic, WebSphere). What benefits do error codes provide? What are the disadvantages to using error codes?

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• How is hashCode() calculated in Java.

  - by Jothi

  What value is hashCode() method is returning in java?. i read that it is an memory reference of an object. when i print hascode value for new Integer(1), its 1. for String(a) - 97. so i confused. is it ascii or what type of value is?

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• wrong operator() overload called

  - by user313202

  okay, I am writing a matrix class and have overloaded the function call operator twice. The core of the matrix is a 2D double array. I am using the MinGW GCC compiler called from a windows console. the first overload is meant to return a double from the array (for viewing an element). the second overload is meant to return a reference to a location in the array (for changing the data in that location. double operator()(int row, int col) const ; //allows view of element double &operator()(int row, int col); //allows assignment of element I am writing a testing routine and have discovered that the "viewing" overload never gets called. for some reason the compiler "defaults" to calling the overload that returns a reference when the following printf() statement is used. fprintf(outp, "%6.2f\t", testMatD(i,j)); I understand that I'm insulting the gods by writing my own matrix class without using vectors and testing with C I/O functions. I will be punished thoroughly in the afterlife, no need to do it here. Ultimately I'd like to know what is going on here and how to fix it. I'd prefer to use the cleaner looking operator overloads rather than member functions. Any ideas? -Cal the matrix class: irrelevant code omitted class Matrix { public: double getElement(int row, int col)const; //returns the element at row,col //operator overloads double operator()(int row, int col) const ; //allows view of element double &operator()(int row, int col); //allows assignment of element private: //data members double **array; //pointer to data array }; double Matrix::getElement(int row, int col)const{ //transform indices into true coordinates (from sorted coordinates //only row needs to be transformed (user can only sort by row) row = sortedArray[row]; result = array[usrZeroRow+row][usrZeroCol+col]; return result; } //operator overloads double Matrix::operator()(int row, int col) const { //this overload is used when viewing an element return getElement(row,col); } double &Matrix::operator()(int row, int col){ //this overload is used when placing an element return array[row+usrZeroRow][col+usrZeroCol]; } The testing program: irrelevant code omitted int main(void){ FILE *outp; outp = fopen("test_output.txt", "w+"); Matrix testMatD(5,7); //construct 5x7 matrix //some initializations omitted fprintf(outp, "%6.2f\t", testMatD(i,j)); //calls the wrong overload }

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• Drupal - Private Content Type without URL access

  - by booze2go

  Hi Guys, i created an additional content type called "clients" where I can create new client records. I mostly reference to this type to retrieve data. Now I'd like to make this content type inaccessible from the outside world. Any idea how that works? Thanks in advance!

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• Python: Cannot concatenate str and NoneType objects

  - by Chase Higgins

  sql = """ INSERT INTO [SCHOOLINFO] VALUES( '""" + self.accountNo + """', '""" + self.altName + """', '""" + self.address1 + """', '""" + self.address2 + """', '""" + self.city + """', '""" + self.state + """', '""" + self.zipCode + """', '""" + self.phone1 + """', '""" + self.phone2 + """', '""" + self.fax + """', '""" + self.contactName + """', '""" + self.contactEmail + """', '""" + self.prize_id + """', '""" + self.shipping + """', '""" + self.chairTempPass + """', '""" + self.studentCount + """' ) """; I have the following code and Python keeps throwing the error that it cannon concatenate strings and nonetype objects. The thing is I have verified every variable here is in fact a string and is not null. I have been stuck on this for quite some time today, and any help would be greatly appreciated.

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• System.Data.Common.DbDataReader

  - by Craig Johnston

  If I use this class to do a SELECT * FROM ... statement against a database, what method or variable of this class should I use just to give me a dump of the output from the SQL statement?

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• Remove querystring from URL

  - by Malcolm Frexner

  What is an easy way to remove the querystring from a Path in Javascript? I have seen a plugin for Jquery that uses window.location.search. I can not do that: The URL in my case is a variable that is set from AJAX. var testURL = '/Products/List?SortDirection=dsc&Sort=price&Page=3&Page2=3&SortOrder=dsc'

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• SQL Server: Are temp tables or unions better?

  - by Jonathan Allen

  Generally speaking, for combining a lot of data is it better to use a temp table/temp variable as a staging area or should I just stick to "UNION ALL"? Assumptions: No further processing is needed, the results are sent directly to the client. The client waits for the complete recordset, so streaming results isn't necessary.

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• Default value for file path in function gives SyntaxError. Work around?

  - by LtPinback

  for this, import os.path def f(data_file_path=os.path.join(os.getcwd(),'temp'),type): ... return data I get this, SyntaxError: non-default argument follows default argument Is there a way to make this work or do I have to define a variable such as, rawdata_path = os.path.join(os.getcwd(),'temp') and then plug that into the function?

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• MongoDB and visual C++ 2008 linker errors

  - by pedlar

  i'm trying to get the c++ client for mongodb working in visual studio 2008. i can reference the includes, but whenever i tell the linker about the mongodb .lib file i get the following error: "fatal error LNK1257: code generation failed". if visual studio can't find the .lib, then i get a bunch of unresolved externals errors. i'm really pretty lost at this point.

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• In Rails Can we pass a parameters to a new Action

  - by fenec

  i would like to write a message using an instince variable in the new invition action like this. redirect_to new_invitation_path("invite your friend") Controller invitations: def new(message) @message = message @from_user_id = facebook_session.user.to_s end Apparently it is not possible how can i find a way around this?

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• storing HTML5 webdatabase table data to sql server periodically

  - by DotnetSparrow

  I want to read data from html5 web database and post to sql server using vb.net server side. I have used following link as reference: http://www.html5rocks.com/en/tutorials/webdatabase/todo/ I have created a web database and created table and stored some data in it. Now I want to store this data to sql server. How to get the data from html 5 web database and post to sql server each hour ( using some js timer). Please suggest solution

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• ebook reader for programming books?

  - by Martin

  Are the current ebook readers good enough for reading programming books (containing diagrams, source-code, screenshots, and so on)? How good are the search functions or the possibilities to set bookmarks, to use a book as a reference? I'd like to hear opinions of ebook reader owners to help me decide whether or not I should buy an ebook reader. (I know this question already exists, but it's over one year old and new ebook readers are now available)

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• Seam Gives Unknow Entity Exception For Entities in Jars

  - by Noura

  Hi, I am trying to use Seam to persist my jpa entities, when I reference an entity that is in a jar seam says unknown entity. I don't want to add all classes in persistence.xml I want seam to scan my jars and auto detect entities (as done by spring). what I miss?

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• Best way to copy the entire contents of a directory in C#

  - by Keith

  I want to copy the entire contents of a directory from one location to another in C#. There doesn't appear to be a way to do this using System.IO classes without lots of recursion. There is a method in VB that we can use if we add a reference to Microsoft.VisualBasic: new Microsoft.VisualBasic.Devices.Computer(). FileSystem.CopyDirectory( sourceFolder, outputFolder ); This seems like a rather ugly hack. Is there a better way?

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• C - Convert long int to signed hex string

  - by Ben

  I have a long int variable that I need to convert to a signed 32bit hexadecimal string (8 characters) (char array) without the "0x" at the start? How would I go about doing this? Thanks.

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• Accessing the ASP.NET Cache from a Separate Thread?

  - by maxp

  Normally i have a static class that reads and writes to HttpContext.Current.Cache However since adding threading to my project, the threads all get null reference exceptions when trying to retrieve this object. Is there any other way i can access it, workarounds or another cache i can use?

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