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  • Null reference but it's not?

    - by Clint Davis
    This is related to my previous question but it is a different problem. I have two classes: Server and Database. Public Class Server Private _name As String Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value End Set End Property Private _databases As List(Of Database) Public Property Databases() As List(Of Database) Get Return _databases End Get Set(ByVal value As List(Of Database)) _databases = value End Set End Property Public Sub LoadTables() Dim db As New Database(Me) db.Name = "test" Databases.Add(db) End Sub End Class Public Class Database Private _server As Server Private _name As String Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value End Set End Property Public Property Server() As Server Get Return _server End Get Set(ByVal value As Server) _server = value End Set End Property Public Sub New(ByVal ser As Server) Server = ser End Sub End Class Fairly simple. I use like this: Dim s As New Server s.Name = "Test" s.LoadTables() The problem is in the LoadTables in the Server class. When it hits Databases.Add(db) it gives me a NullReference error (Object reference not set). I don't understand how it is getting that, all the objects are set. Any ideas? Thanks.

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  • Get information from a higher class?

    - by Clint Davis
    I don't know really how to word the question so please bear with me... I have 3 classes: Server, Database, and Table. Each class has a "Name" property. How I want it to work is that each server can have multiple databases and each database can have multiple tables. So in the Server class I have this property. Private _databases As List(Of Database) Public Property Databases() As List(Of Database) Get Return _databases End Get Set(ByVal value As List(Of Database)) _databases = value End Set End Property And I have something similar in the Database class for the tables. This works fine now because I can do something like this to get all the databases in the server. For Each db In s.Databases 's being the server object Debug.Print(db.Name) Next I would like to expand these classes. I want the server class to handle all the connection information and I would like the other classes to use the server class's connection information in them. For example, I setup a server class and set the connection string to the server. Then I want the database class to use serverclass.connectionstring property to connect to the server and get a list of all the databases. But I want to keep that code in the database class. How can I do this? I've attached some code of what I want to do. Public Class Server Private _name As String Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value End Set End Property Private _databases As List(Of Database) Public Property Databases() As List(Of Database) Get Return _databases End Get Set(ByVal value As List(Of Database)) _databases = value End Set End Property End Class '-----New class Public Class Database Private _name As String Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value End Set End Property Private _tables As List(Of Table) Public Property Tables() As List(Of Table) Get Return _tables End Get Set(ByVal value As List(Of Table)) _tables = value End Set End Property 'This is where I need help! Private Sub LoadTables () dim connectionstring as string = server.connectionstring 'Possible? 'Do database stuff End Class Thanks for reading!

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  • How do I put unordered list items into an array

    - by Clint
    Hi, My code is... How do I get the text in each list item into an array using native javascript? <ul id="list"> <li>List Item 1</li> <li>List Item 2</li> <li>List Item 3</li> <li>List Item 4</li> </ul> <script type="text/javascript"> var list = document.getElementById('list').childNodes.TextNode; for(var i=0;i < list.length; i++) { var arrValue = list[i]; alert(arrValue); } </script> Many thanks.

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  • Javascript delete cookie next day

    - by Clint
    Hi, I was wonder if you can delete a cookie at the beginning of the next day. Lets say I log in to a website at 1:30pm and use it again throughout the day but at midnight or 1 minute past, in the new day, the cookie is removed. Many thanks for any help, C

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  • Class library modification / migration

    - by Clint
    I have 3 class libraries. A BBL, a DAL, and a DATA (about 15 datasets). Currently 4 [major] applications utilize the functionality in these DLL's. I'm rewriting one of those applications and I need to (1) Use some of the existing functionality in the libraries (2) Change some of it (3) Add new functionality (4) Add new datasets. I'm back and forth about the best way to do this, while keeping my risks at a minimum. Some thoughts.. 1) Use the existing projects and don't make any modifications, only additions 2) Make new libraries, bring over the code I can use, and make additions as needed 3) Implement partial classes in the existing projects Eventually all 4 applications will use the newest functionality, but it will be a slow migration; so the old code can't be depricated yet. Any thoughts?

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  • Function 'didFinishLaunchingWithOptions' getting invoked inappropriately

    - by clint
    I connected my IOS device to a MAC processor and installed/initialized my app running in xcode or dragged it from itunes folder. Now i physically disconnected my device from the processor and through wifi enabled in the device, sent notifications/messages through APNS to the device. I was able to successfully receive notifications in the device. Now after some time, i reconnected the device to the processor, which lead to a problem of the app launching again and calling 'didFinishLaunchingWithOptions' method again, which is not desirable as the launch/initialization should happen only once. This behaviour is random ie. every time when i disconnect/reconnect, it is not happening, only sometimes. Why is this happening. What could be the reason for this random behaviour. Any help will be appreciated.Thanks

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  • Why the “Toilet” Analogy for SQL might be bad

    - by Jonathan Kehayias
    Robert Davis(blog/twitter) recently blogged The Toilet Analogy … or Why I Never Recommend Increasing Worker Threads , in which he uses an analogy for why increasing the value for the ‘max worker threads’ sp_configure option can be bad inside of SQL Server.  While I can’t make an argument against Robert’s assertion that increasing worker threads may not improve performance, I can make an argument against his suggestion that, simply increasing the number of logical processors, for example from...(read more)

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  • An XEvent a Day (16 of 31) – How Many Checkpoints are Issued During a Full Backup?

    - by Jonathan Kehayias
    This wasn’t my intended blog post for today, but last night a question came across #SQLHelp on Twitter from Varun ( Twitter ). #sqlhelp how many checkpoints are issued during a full backup? The question was answered by Robert Davis (Blog|Twitter) as: Just 1, at the very start. RT @ 1sql : #sqlhelp how many checkpoints are issued during a full backup? This seemed like a great thing to test out with Extended Events so I ran through the available Events in SQL Server 2008, and the only Event related...(read more)

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  • SQLCruise Alaska was Amazing

    - by AllenMWhite
    You'd think that providing in-depth SQL Server training on a cruise ship would be an excuse for a vacation disguised as a business trip, but you'd be wrong. This past week I traveled with the founders of SQLCruise, Tim Ford and Brent Ozar , along with other top professionals in the SQL Server world - Jeremiah Peschka , Kendra Little , Kevin Kline and Robert Davis - and me. The week began with Brent presenting a session on Plan Cache Analysis, which I plan to start using very soon. After Brent, Kevin...(read more)

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  • SQLCruise Alaska was Amazing

    - by AllenMWhite
    You'd think that providing in-depth SQL Server training on a cruise ship would be an excuse for a vacation disguised as a business trip, but you'd be wrong. This past week I traveled with the founders of SQLCruise, Tim Ford and Brent Ozar , along with other top professionals in the SQL Server world - Jeremiah Peschka , Kendra Little , Kevin Kline and Robert Davis - and me. The week began with Brent presenting a session on Plan Cache Analysis, which I plan to start using very soon. After Brent, Kevin...(read more)

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  • Speaking - Automate Your ETL Infrastructure with SSIS and PowerShell

    - by AllenMWhite
    Today at 4:45PM EDT I'm presenting a new session using PowerShell to auto-generate SSIS packages via the BIML language. The really cool thing is that this session will be live broadcast on PASS TV! You can view the session by clicking on this link . If you have questions for me during the session, you can send them to me via Twitter using this hashtag: #posh2biml Brian Davis, my good friend from the Ohio North SQL Server Users Group, will be monitoring that hashtag and feeding me the questions that...(read more)

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  • Reflections on SQL Saturday #60 - Cleveland

    - by AaronBertrand
    Every time I attend a SQL Saturday , I leave with a rejuvenated and even further reinforced sense of community. Cleveland ( SQL Saturday #60 ) was by far no exception. Allen White ( blog | twitter ), Erin Stellato ( blog | twitter ), Cory Stevenson, Brian Davis ( twitter ), and all others involved put on a fantastic event that endured some crappy weather, parking problems, and significant delays and hardship for at least one speaker - sorry Grant! (Grant wrote about his experience .) I was able to...(read more)

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  • Reflections on SQL Saturday #60 - Cleveland

    - by AaronBertrand
    Every time I attend a SQL Saturday , I leave with a rejuvenated and even further reinforced sense of community. Cleveland ( SQL Saturday #60 ) was by far no exception. Allen White ( blog | twitter ), Erin Stellato ( blog | twitter ), Cory Stevenson, Brian Davis ( twitter ), and all others involved put on a fantastic event that endured some crappy weather, parking problems, and significant delays and hardship for at least one speaker - sorry Grant! (Grant wrote about his experience .) I was able to...(read more)

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  • Windows Phone 7 Apps ? Iphone Killer?

    It';s not that long since Microsoft revamped Windows with their Windows 7 and made casual users and reviewers rejoice over the stunning looks and functionality. Of course, not many people understood a... [Author: Huey Davis - Computers and Internet - June 12, 2010]

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  • Optimizing Transaction Log Throughput

    As a DBA, it is vital to manage transaction log growth explicitly, rather than let SQL Server auto-growth events "manage" it for you. If you undersize the log, and then let SQL Server auto-grow it in small increments, you'll end up with a very fragmented log. Examples in the article, extracted from SQL Server Transaction Log Management by Tony Davis and Gail Shaw, demonstrate how this can have a significant impact on the performance of any SQL Server operations that need to read the log.

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  • Git for beginners: The definitive practical guide

    - by Adam Davis
    Ok, after seeing this post by PJ Hyett, I have decided to skip to the end and go with git. So what I need is a beginners practical guide to git. "Beginner" being defined as someone who knows how to handle their compiler, understands to some level what a makefile is, and has touched source control without understanding it very well. "Practical" being defined as this person doesn't want to get into great detail regarding what git is doing in the background, and doesn't even care (or know) that it's distributed. Your answers might hint at the possibilities, but try to aim for the beginner that wants to keep a 'main' repository on a 'server' which is backed up and secure, and treat their local repository as merely a 'client' resource. Procedural note: PLEASE pick one and only one of the below topics and answer it clearly and concisely in any given answer. Don't try to jam a bunch of information into one answer. Don't just link to other resources - cut and paste with attribution if copyright allows, otherwise learn it and explain it in your own words (ie, don't make people leave this page to learn a task). Please comment on, or edit, an already existing answer unless your explanation is very different and you think the community is better served with a different explanation rather than altering the existing explanation. So: Installation/Setup How to install git How do you set up git? Try to cover linux, windows, mac, think 'client/server' mindset. Setup GIT Server with Msysgit on Windows How do you create a new project/repository? How do you configure it to ignore files (.obj, .user, etc) that are not really part of the codebase? Working with the code How do you get the latest code? How do you check out code? How do you commit changes? How do you see what's uncommitted, or the status of your current codebase? How do you destroy unwanted commits? How do you compare two revisions of a file, or your current file and a previous revision? How do you see the history of revisions to a file? How do you handle binary files (visio docs, for instance, or compiler environments)? How do you merge files changed at the "same time"? How do you undo (revert or reset) a commit? Tagging, branching, releases, baselines How do you 'mark' 'tag' or 'release' a particular set of revisions for a particular set of files so you can always pull that one later? How do you pull a particular 'release'? How do you branch? How do you merge branches? How do you resolve conflicts and complete the merge? How do you merge parts of one branch into another branch? What is rebasing? How do I track remote branches? How can I create a branch on a remote repository? Other Describe and link to a good gui, IDE plugin, etc that makes git a non-command line resource, but please list its limitations as well as its good. msysgit - Cross platform, included with git gitk - Cross platform history viewer, included with git gitnub - OS X gitx - OS X history viewer smartgit - Cross platform, commercial, beta tig - console GUI for Linux qgit - GUI for Windows, Linux Any other common tasks a beginner should know? Git Status tells you what you just did, what branch you have, and other useful information How do I work effectively with a subversion repository set as my source control source? Other git beginner's references git guide git book git magic gitcasts github guides git tutorial Progit - book by Scott Chacon Git - SVN Crash Course Delving into git Understanding git conceptually I will go through the entries from time to time and 'tidy' them up so they have a consistent look/feel and it's easy to scan the list - feel free to follow a simple "header - brief explanation - list of instructions - gotchas and extra info" template. I'll also link to the entries from the bullet list above so it's easy to find them later.

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  • How to convert DATETIME to FILETIME value in T-SQL?

    - by Alek Davis
    I need to convert a SQL Server DATETIME value to FILETIME in a T-SQL SELECT statement (on SQL Server 2000). Is there a built-in function to do this? If not, can someone help me figure out how to implement this conversion routine as a UDF (or just plain Transact-SQL)? Here is what I know: FILETIME is 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 (UTC) (per MSDN: FILETIME Structure). SQL Server time era starts on 1900-01-01 00:00:00 (per SELECT CAST(0 as DATETIME). I found several examples showing how to convert FILETIME values to T-SQL DATETIME (I'm not 100% sure they are accurate, though), but could not find anything about reverse conversion. Even the general idea (or algorithm) would help.

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  • New HandleProcessCorruptedStateExceptions attribute in .Net 4

    - by Yaakov Davis
    I'm trying to crash my WPF application, and capture the exception using the above new .Net 4 attribute. I managed to manually crash my application by calling Environment.FailFast("crash");. (Also managed to crash it using Hans's code from here: http://stackoverflow.com/questions/2950130/how-to-simulate-a-corrupt-state-exception-in-net-4). The app calls the above crashing code when pressing on a button. Here are my exception handlers: protected override void OnStartup(StartupEventArgs e) { base.OnStartup(e); AppDomain.CurrentDomain.FirstChanceException += CurrentDomain_FirstChanceException; AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException; DispatcherUnhandledException += app_DispatcherUnhandledException; } [HandleProcessCorruptedStateExceptions] void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e) { //log.. } [HandleProcessCorruptedStateExceptions] void CurrentDomain_FirstChanceException(object sender, System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs e) { //log.. } [HandleProcessCorruptedStateExceptions] void app_DispatcherUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e) { //log.. } The //log... comment shown above is just for illustration; there's real logging code there. When running in VS, an exception is thrown, but it doesn't 'bubble' up to those exception handler blocks. When running as standalone (w/o debugger attached), I don't get any log, despite what I expect. Does anyone has an idea why is it so, and how to make the handling code to be executed? Many thanks, Yaakov

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  • Flex 4 - What makes a GC root?

    - by Michael Brewer-Davis
    What are the rules for something to be a GC root in Flash? I'm using the Flash Builder 4 profiler, and I'm finding odd things are labeled as GC roots in the object reference details (e.g., an Image control that is no longer in the display list, nor static).

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  • ORACLE PL/Scope

    - by Yaakov Davis
    I didn't find much data about the internals of PL/Scope. I'd like to use it to analyze identifiers in PL/SQL scripts. Does it work only on Oracle 11g instances? Can I reference its dlls to use it on a machine with only ORACLE 9/10 installed? In a related manner, do I have to execute the script in order to its identifiers to be analyzed?

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  • iphone bookmarklet cookie persistence

    - by Larry Davis
    I have an iphone (jqtouch based) web app that uses cookies for authentication. The use flow is as follows : user goes to the mobile landing page and is instructed to save the page as a bookmarklet on their home page. they launch the bookmarklet to go to a login page to login and get a cookie. the cookie works and they can navigate throughout the web site. However this session cookie is not persistent. If they leave safari and then restart using the saved bookmarklet, the cookies set during their previous session are gone. Just using safari (ie: launch safari directly rather than through the bookmarklet) to navigate the pages works fine (ie: start safari, go to url, do login, restart safari, go back to url). I find that that the cookies that were active when the bookmarklet was created are persistent but any cookies set during the session when safari is accessed through the bookmarklet are not persistent. I'm wondering if this is a safari/iphone issue and/or if there is any way around this. Many thanks for any insight you can provide.

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  • Is CSS turing complete?

    - by Adam Davis
    CSS isn't, insofar as I know, Turing complete. But my knowledge of CSS is very limited. Is CSS Turing complete? Are any of the existing draft or committees considering language features that might enable Turing completeness if it isn't right now?

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  • Intro to GPU programming

    - by Adam Davis
    Everyone has this huge massively parallelized supercomputer on their desktop in the form of a graphics card GPU. What is the "hello world" equivalent of the GPU community? What do I do, where do I go, to get started programming the GPU for the major GPU vendors? -Adam

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