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• When not to use a private field

  - by coffeeaddict

  When should it be considered dangerous to use a private field all over the place in the methods of your class? I mostly just create the variable and set it to a default value like null. Then in my methods reference it and set it to an instance of that object type from the methods. I don't know if my question makes sense but let me know if it doesn't and I'll clarify.

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• How can this SQL be wrong? What am I not seeing?

  - by ropstah

  Can anybody please spot my error, this should be a legal query in SQL shouldn't it?? Unknown column u.usr_auto_key in the ON clause This is the database schema: User: (usr_auto_key, name, etc...) Setting: (set_auto_key, name etc..) User_Setting: (usr_auto_key, set_auto_key, value) And this is the query... SELECT `u`.`usr_auto_key` AS `u__usr_auto_key`, `s`.`set_auto_key` AS `s__set_auto_key`, `u2`.`usr_auto_key` AS `u2__usr_auto_key`, `u2`.`set_auto_key` AS `u2__set_auto_key`, `u2`.`value` AS `u2__value` FROM `User` `u`, `Setting` `s` LEFT JOIN `User_Setting` `u2` ON `u`.`usr_auto_key` = `u2`.`usr_auto_key` WHERE (`s`.`sct_auto_key` = 1 AND `u`.`usr_auto_key` = 1 AND admin_property is null)

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• Any way to anticipate session timeout ?

  - by Tom

  Hi, Is there a way to "catch" the session timeout event, so as to retrieve data from HttpSession before its invalidated ? We're implementing the Filter Interface, and in the doFilter method, the user we stored in the session object at login is null when session times out. Thanks in advance.

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• How to set size (width,height) of externally loaded swf

  - by Raj

  Hi, I have loaded swf using following code, var loader:Loader = new Loader(); loader.load(new URLRequest("XYZ.swf")); addChild(loader); How do I control height and width of this loaded swf. I tried var mc = MovieClip(loader.loaderContentInfo.content); mc.width = 320; mc.height = 240; this gives null object error.

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• Database design

  - by Hadad

  Hello, I've a system, that have two types of users (Companies and individuals).all types have a shared set of properties but they differ in another. What is the best design merge all in one table that allows null for unmatched properties, or separate them in two tables related to a basic table with a one to one relationship. Thanks.

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• how to save Audiorecorded file to another location? i m trying but i got exception...

  - by rakesh-bhatt99

  NSString recordFile = [NSTemporaryDirectory() stringByAppendingPathComponent: (NSString)inRecordFile]; NSArray *docPaths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES); NSString docDir=[[docPaths objectAtIndex:0]stringByAppendingPathComponent: (NSString)inRecordFile]; url = CFURLCreateWithString(kCFAllocatorDefault, (CFStringRef)docPaths, NULL); // create the audio file XThrowIfError(AudioFileCreateWithURL(url, kAudioFileCAFType, &mRecordFormat, kAudioFileFlags_EraseFile, &mRecordFile), "AudioFileCreateWithURL failed"); CFRelease(url);

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• SQL Server 2008 Problem with SCOPE_IDENTITY()

  - by jinsungy

  My code does not update the thread field. It is null. Anyone have any ideas? INSERT INTO [Messages]([Sender], [Receiver], [Job_Number], [Subject], [MessageText], [DateSent]) VALUES(@Sender, @Receiver, @Job_Number, @Subject, @MessageText, @DateSent) SET @ThreadID = SCOPE_IDENTITY() UPDATE [Messages] SET Thread = @ThreadID WHERE MessageID = @ThreadID

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• Difference between various string comparisons in Java

  - by Gandalf StormCrow

  Is there a difference between these ? if(myString.equals("")){ } if(myString.equals(null)){ } if(myString == ""){ } I have a string, I don't know is it empty or has some emtpy spaces I just wan't to stop it to be written in database if it is invalid(if empty or with some blank spaces).

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• asp.net: when is the data from session getting lost

  - by Omu

  I'm wondering if I'm going to store some data into the session is it going to be there while the user is authenticated (using formsauth) or might happen that the data will suddenly go null

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• Sql server Identity issue

  - by pranay

  I have query like below declare @str_CustomerID int Insert into IMDECONP38.[Customer].dbo.CustomerMaster ( CustomerName , CustomerAddress , CustomerEmail , CustomerPhone ) values ( ‘werw12e’ , ‘jkj12kj’ , ‘3212423sdf’ , ‘1212121' ) select @str_CustomerID= scope_identity() after execution it returns null in my parameter i want to get value of identity how can i do that

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• Linking ?++ - BDB - LNK2001

  - by MInner

  BDB is compiled on the same PC, under same VS. #include <db_cxx.h> int main(){ Db b(NULL, 0); return 0; } 1main.obj : error LNK2001: unresolved external symbol ""public: virtual __thiscall Db::~Db(void)" (??1Db@@UAE@XZ)" 1main.obj : error LNK2001: unresolved external symbol ""public: __thiscall Db::Db(class DbEnv *,unsigned int)" (??0Db@@QAE@PAVDbEnv@@I@Z)" what could be wrong?

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• How to save links with tags and parameters in TextField

  - by xRobot

  I have this simple Post model: class Post(models.Model): title = models.CharField(_('title'), max_length=60, blank=True, null=True) body = models.TextField(_('body')) blog = models.ForeignKey(Blog, related_name="posts") user = models.ForeignKey(User) I want that when I insert in the form the links, then these links are saved in the body from this form: http://www.example.com or www.example.com to this form ( with tag and rel="nofollow" parameter ): <a href="http://www.example.com" rel="nofollow">www.example.com</a> How can I do this ? Thanks ^_^

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• Cache in asp.net

  - by newperson

  Cache.Insert("lstDownload", GetListDownload(), null, DateTime.Now.AddDays(1), TimeSpan.Zero); when will cache be exprired? what will we receive when cache expired? http://stackoverflow.com/questions

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• Why can you assign Nothing to an Integer in VB.NET?

  - by JoelFan

  Why am I allowed to say: Dim x as Integer x = Nothing in VB.NET, but I can't say: int x; x = null; in C# ?

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• concurrentmodificationexception hashmap in java

  - by chetan

  I write following code but when this run it generate concurrentmodificationexception if( attendancePolicy.getType().equals( AttendanceConstants.EMPLOYEE_ATTENDANCE_POLICY ) ) { synchronized( attendancePolicy.getListEmployee() ) { for( EmployeeAttendancePolicy employeeAttendancePolicy : attendancePolicy.getListEmployee() ) { employeeInfo = employeeInfoSessionBeanLocal.findEmployeeInfoEntityByEmployeeInfoId( employeeAttendancePolicy.getEmployeeId() ); if( employeeInfo != null ) { employeeAttendancePolicy.setEmpName( employeeInfo.getFirstName() + " " + employeeInfo.getMiddleName() + " " + employeeInfo.getLastName() ); company = companySessionBeanLocal.findCompanyById( employeeInfo.getCompanyId() ); employeeAttendancePolicy.setCompanyName( company.getName() ); department = departmentSessionBeanLocal.findDepartmentEntityByDepartmentId( employeeInfo.getDepartmentId() ); employeeAttendancePolicy.setDepartmentName( department.getName() ); } else { attendancePolicy.getListEmployee().remove( employeeAttendancePolicy ); } } } }

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• how to get the button value from jsp to servlet

  - by kawtousse

  hi, how to get the button value from jsp to servlet in jsp: <input type=button name=bt value=gi onclick="document.frm.submit();"></input> and in servlet like that: String gi =request.getParameter("bt"); System.out.print("button value" +gi); result=null thanks

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• JQuery get/ajax call executes callback without waiting for response

  - by dannyroa

  I'm having issues with my JQuery Ajax Call. The response is always null because the callback function is executed before the request to get_friends is completed. Is there anything I'm missing? Thanks in advance. $('#btn_update').click(function() { url = '/get_friends/'; $.get(url, {}, function(response){ alert(response); }); });

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• C++/CLI DLL on C# doesn't compile

  - by Mishgun_

  I wrote a wrapper DLL for some native c++ functions and compiled it in c++/CLI, then I added a reference to C# project, functions indicates there, but when I try compile project I get this error: "Additional information: Could not load file or assembly 'lib, Version=1.0.3742.39593, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format. " What's the problem ? Thanks.

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• How to access the elements in <script> inside the body tag

  - by Geetha

  Hi All, I am using <script> inside the body tag. <script type="text/javascript" language="javascript"> $('#audioVolume').text($('#audioVolume').text(Math.round((document.mediaPlayer.Volume + 2000) / 10) + "%")); </script> Error: Microsoft JScript runtime error: 'undefined' is null or not an object. Need: I want to access the html elements in <script inside the body tag.

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• C# reads wrong registry data on 64-bit OS

  - by baal80

  I'm working on a 64-bit Windows and my applicaiton runs with elevated privileges. I have a problem with the following very simple piece of code: myKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run"); if (myKey != null) { string[] HKLMvaluenames = myKey.GetValueNames(); } But for some reason HKLMvaluenames array is populated with values from the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run Is there a way around this problem?

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• How to check results of LINQ to SQL query?

  - by rem

  In a WPF app I'd like to check if a return of a LINQ to SQL query contains some records, but my approach doesn't work: TdbDataContext context = new TdbDataContext(); var sh = from p in context.Items where p.Selected == true select p; if (sh == null) { MessageBox.Show("There are no Selected Items"); } Where am I wrong?

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• What values do the walkback array in the SocketException contain?

  - by akhilss

  Recently I have debugging into a problem where a connection to a database server from the application server get reset. I am pretty sure there is no reset being called from either end. But while I was debugging into the problem, while inspecting the SocketException, I found the walkback variable. arg0 SocketException (id=11532) cause SocketException (id=11532) detailMessage "Connection reset" stackTrace null walkback long[50] (id=11618) What do the values in this variable represent?

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• # character seems to cause problems with a get Request

  - by Ankur

  I have a queryString that I pass to a servlet's doGet() method that looks like this: count=9&preId0=-99&objId0=-99&preId1=-99&objId1=-99&preId2=69&objId2=16#!78&preId3=-99&objId3=-99&preId4=-99&objId4=-99&preId5=-99&objId5=-99&preId6=-99&objId6=-99&preId7=-99&objId7=-99&preId8=-99&objId8=-99 After and including the # everything is null, so I am assuming the # has some special meaning. Is this true? and are there other such characters that will do this?

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• what does select @@identity do?

  - by every_answer_gets_a_point

  i am connecting to a mysql database through excel using odbc what does this line do? Set rs = oConn.Execute("SELECT @@identity", , adCmdText) i am having trouble updating the database: With rs .AddNew ' create a new record ' add values to each field in the record .Fields("datapath") = dpath .Fields("analysistime") = atime .Fields("reporttime") = rtime .Fields("lastcalib") = lcalib .Fields("analystname") = aname .Fields("reportname") = rname .Fields("batchstate") = "bstate" .Fields("instrument") = "NA" .Update ' stores the new record End With it is ONLY updating .Fields("instrument") = "NA", but for all other fields it is putting NULL values

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• ASP.NET MVC - Can't access a parent class in a database relationship (LINQ TO SQL)

  - by Alex

  I have a class User and a class History. History has 'User' property, and User has 'Histories' property. So there's a database relationship. But when I create a new User history class and set UserID property, I can't access the 'User' property. var history = new History { UserID = 1 }; // history.User = null ??? How can I get the user?

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