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• Java library for trees similar to JGraphT for graphs?

  - by lexicore

  I'm a big fan of JGraphT, a Java library for graphs. Could anyone recommend a similar Java library for trees? Preferrably FOSS. What I need is a good API, preferrably typesafe with generics which allows modelling different kinds of trees (with some user data attached to verticies/edges) and run different algorithms and operations on these trees. For instance, traverse or balance. At the moment I'm not interested in visualization of trees.

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• Recursive breadth-first travel function in Java or C++?

  - by joejax

  Here is a java code for breadth-first travel: void breadthFirstNonRecursive(){ Queue<Node> queue = new java.util.LinkedList<Node>(); queue.offer(root); while(!queue.isEmpty()){ Node node = queue.poll(); visit(node); if (node.left != null) queue.offer(node.left); if (node.right != null) queue.offer(node.right); } } Is it possible to write a recursive function to do the same? At first, I thought this would be easy, so I came out with this: void breadthFirstRecursive(){ Queue<Node> q = new LinkedList<Node>(); breadthFirst(root, q); } void breadthFirst(Node node, Queue<Node> q){ if (node == null) return; q.offer(node); Node n = q.poll(); visit(n); if (n.left != null) breadthFirst(n.left, q); if (n.right != null) breadthFirst(n.right, q); } Then I found it doesn't work. It is actually does the same thing as this: void preOrder(Node node) { if (node == null) return; visit(node); preOrder(node.left); preOrder(node.right); } Has any one thought about this before?

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• Python list recursion type error

  - by Jacob J Callahan

  I can't seem to figure out why the following code is giving me a TypeError: 'type' object is not iterable pastebin: http://pastebin.com/VFZYY4v0 def genList(self): #recursively generates a sorted list of child node values numList = [] if self.leftChild != 'none': numList.extend(self.leftChild.genList()) #error numList.extend(list((self.Value,))) if self.rightChild != 'none': numList.extend(self.rightChild.genList()) #error return numList code that adds child nodes (works correctly) def addChild(self, child): #add a child node. working if child.Value < self.Value: if self.leftChild == 'none': self.leftChild = child child.parent = self else: self.leftChild.addChild(child) elif child.Value > self.Value: if self.rightChild == 'none': self.rightChild = child child.parent = self else: self.rightChild.addChild(child) Any help would be appreciated. Full interpreter session: >>> import BinTreeNode as BTN >>> node1 = BTN.BinaryTreeNode(5) >>> node2 = BTN.BinaryTreeNode(2) >>> node3 = BTN.BinaryTreeNode(12) >>> node3 = BTN.BinaryTreeNode(16) >>> node4 = BTN.BinaryTreeNode(4) >>> node5 = BTN.BinaryTreeNode(13) >>> node1.addChild(node2) >>> node1.addChild(node3) >>> node1.addChild(node4) >>> node1.addChild(node5) >>> node4.genList() <class 'list'> >>> node1.genList() Traceback (most recent call last): File "<interactive input>", line 1, in <module> File "C:...\python\BinTreeNode.py", line 47, in genList numList.extend(self.leftChild.genList()) #error File "C:...\python\BinTreeNode.py", line 52, in genList TypeError: 'type' object is not iterable

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• Insertion into BST without header Node JAVA

  - by Petiatil

  I am working on a recursive insertion method for a BST. This function is suppose to be a recursive helper method and is in a private class called Node. The Node class is in a class called BinarySearchTree which contains an instance variable for the root. When I am trying to insert an element, I get a NullPointerException at : this.left = insert(((Node)left).element); I am unsure about why this occurs. If I understand correctly, in a BST, I am suppose to insert the item at the last spot on the path transversed. Any help is appreciated! private class Node implements BinaryNode<E> { E item; BinaryNode<E> left, right; public BinaryNode<E> insert(E item) { int compare = item.compareTo(((Node)root).item); if(root == null) { root = new Node(); ((Node)root).item = item; } else if(compare < 0) { this.left = insert(((Node)left).item); } else if(compare > 0) { this.right = insert(((Node)right).item); } return root; } }

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• Python iterate object with a list of objects

  - by nerd

  First time poster, long time reader. Is it possible to iterate though an object that contains a list of objects. For example, I have the following class Class Page(object) def __init__(self, name): self.name = name self.pages = [] I then create a new Page object and add other page objects to it. page = Page('FirstPage') apagepage = Page('FirstChild') anotherpagepage = Page('SecondChild') apagepage.pages.append(Page('FirstChildChild')) apagepage.pages.append(Page('SecondChildChild')) page.pages.append(apagepage) page.pages.append(anotherpagepage) What I would like to do is for thispage in page: print thispage.name And get the following output FirstPage FirstChild SecondChild FirstChildChild SecondChildChild So I get all the 1st level, then the 2nd, then the 3rd. However, the following output would be find as well FirstPage FirstChild FirstChildChild SecondChildChild SecondChild

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• How to embedded a link in a XUL treecell ?

  - by pablo07

  The question is simple. I want to put a link in a XUL treecell. thanks

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• Exceptional DBA 2011 Jeff Moden on why you should enter in 2012

  - by Red and the Community

  My "reign" as the Red Gate Exceptional DBA is almost over and I was asked to say a few words about this wonderful award. Having been one of those folks that shied away from entering the contest during the first 3 years of the award, I thought I’d spend the time encouraging DBAs of all types to enter. Winning this award has some obvious benefits. You win a trip to PASS including money towards your flight, paid hotel stay, and, of course, paid admission. You win a wonderful bundle of software from Red Gate to make your job as a DBA a whole lot easier. You also win some pretty incredible notoriety for your resume. After all, it’s not everyone who wins a worldwide contest. To date, there are only 4 of us in the world who have won this award. You could be number 5! For me, all of that pales in comparison to what I found out during the entry process. I’m very confident in my skills, but I’m also humble. It was suggested to me that I enter the contest when it first started. I just couldn’t bring myself to nominate myself. When the 2011 nomination period opened up, several people again suggested that I enter, so I swallowed hard and asked several co-workers to have a look at the online nomination form and, if they thought me worthy, to write a nomination for me. I won’t bore you with the details, but what they wrote about me was one of the most incredible rewards that I could ever have hoped to receive. I had no idea of the impact that I’d made on my co-workers. Even if I hadn’t made it to the top 5 for the award, I had already won something very near and dear that no one can ever top. “Even if I hadn’t made it to the top 5 for the award, I had already won something very near and dear that no one can ever top.” There’s only one named winner and 4 "runners up" in this competition every year but don’t let that discourage you. Enter this competition. Even if you work in the proverbial "Mom’n'Pop" shop, get your boss and the people you work with directly to nominate you. Even if you don’t make it to the top 5, you might just find out that you’re more of a winner than you think. If you’re too proud to ask them, then take the time to nominate yourself instead of shying away like I did for the first 3 years. You work hard as a DBA and, as David Poole once said, if you’re the first person that people ask for help rather than one of the last, then you’re probably an Exceptional DBA. It’s time to stand up and be counted! Win or lose, the entry process can be a huge reward in itself. It was for me. Thank you, Red Gate, for giving me such a wonderful opportunity. Thanks for listening folks and for all that you do as DBAs. As ‘Red Green’ says, "We’re all in this together and I’m pullin’ for ya". –Jeff Moden Red Gate Exceptional DBA 2011

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• SQL Group By Modulo of Row Count

  - by Alex Czarto

  I have the following sample data: Id Name Quantity 1 Red 1 2 Red 3 3 Blue 1 4 Red 1 5 Yellow 3 So for this example, there are a total of 5 Red, 1 Blue, and 3 Yellow. I am looking for a way to group them by Color, but with a maximum of 2 items per group (sorting is not important). Like so: Name QuantityInPackage Red 2 Red 2 Red 1 Blue 1 Yellow 2 Yellow 1 Any suggestions on how to accomplish this using T-SQL on MS-SQL 2005?

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• Unable to enter ubuntu after reboot PC; showing black screen with lots of weire words

  - by Phoenix Wei

  I use Wubi to install Ubuntu 12.04 on my Windows 7 system. My PC is Acer Aspire S5-391 with a 64-bit operating system. After I finish installing Wubi on Windows I reboot my PC as told by the instruction. Then I got a black screen with the following words shown: [[BGave up waiting for root device. Common Problems: -Boot args (cat/proc/cmdline) -Check rootdelay=(did the system wait long enough?) -check root=(did the system wait for the right device?) -Missing modules(cat/proc/modules; ls/dev) ALERT! /dev/disk/by-uuid/928E20128E1FEE0B does not exist. Dropping to a shell! BusyBox v1.18.5(ubuntu 1:1.18.5-1ubuntu4)built-in shell (ash) Enter 'help' for a list of built-in commands. (intramfs) _ I don't know how to deal with this but force my PC to shut down. I can still successfully enter Windows. But everytime I try to enter unbuntu, it shows the above words.......

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• Mono Project: How to install Mono framework on Red Hat Linux which is compiled on centOS ?

  - by funwithcoding

  We have Red Hat Enterprise Linux servers at work place. However we dont have Red Hat Linux desktops. So I used CentOS 5.4 to compile the Mono sources and generated the Mono framework for CentOS and tested with some sample codes and I am satisfied. I want to transfer this compiled framework to Red Hat Enterprise Linux 5. How Can I do that? Do I have to compile the Mono framework statically or do I have to copy the linked libraries as well? I am not familiar with linux much. Any help is highly appreciated.

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• Feed the Beast Ultimate black screen after login 13.04?

  - by Drew S

  I get a black screen after login feed the beast ultimate splash animation. I have tried the manual LWJGL upgrading, using different versions of java (6 and 7 openJDK). no matter what I get this 2013-06-28 15:23:17 [INFO] [STDERR] Exception in thread "Minecraft main thread" java.lang.ExceptionInInitializerError 2013-06-28 15:23:17 [INFO] [STDERR] at net.minecraft.client.Minecraft.a(Minecraft.java:356) 2013-06-28 15:23:17 [INFO] [STDERR] at asq.a(SourceFile:56) 2013-06-28 15:23:17 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:746) 2013-06-28 15:23:17 [INFO] [STDERR] at java.lang.Thread.run(Thread.java:722) 2013-06-28 15:23:17 [INFO] [STDERR] Caused by: java.lang.ArrayIndexOutOfBoundsException: 0 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR$Screen.<init>(XRandR.java:234) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR$Screen.<init>(XRandR.java:196) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR.populate(XRandR.java:87) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR.access$100(XRandR.java:52) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR$1.run(XRandR.java:110) 2013-06-28 15:23:17 [INFO] [STDERR] at java.security.AccessController.doPrivileged(Native Method) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.XRandR.getConfiguration(XRandR.java:108) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.LinuxDisplay.init(LinuxDisplay.java:618) 2013-06-28 15:23:17 [INFO] [STDERR] at org.lwjgl.opengl.Display.<clinit>(Display.java:135) 2013-06-28 15:23:17 [INFO] [STDERR] ... 4 more

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• What web technology could I use which would support a decision tree?

  - by Rami Alhamad

  I am a big game development fan but I haven't done any commercial work in the past. I have been asked by a non-profit to look at developing a game similar to the award-winning www.playspent.org They want the following features: support 5 scenarios mobile isn't important but compatibility with older browsers would be a big bonus they want it to be visual and audible bonus is to have it easily modifiable support 4 languages I don't have much knowledge of Flash and would rather avoid using it as a solution. I started breaking down the problem into segments that I will need to examine, they are as follows: ability to read the game flow from a file that they can produce (xml, etc.) db design to store decision tree language challenge browser compatibility I am leaning towards an Google app engine/GWT solution but I am not sure what technology is best for this. I am really hoping to get your opinion/recommendation on my approach and on what technology is best. A special thanks (and beer if you live in Toronto) will be awarded to anyone who can help give me a ballpark estimate on how much such a game should go for. I know it's tough to estimate but any rough figure will help (how much would you charge for building something like playspent.org?) Thanks in advance

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• Script/tool to import series of snapshots, each being a new edition, into GIT, populating source tree?

  - by Rob

  I've developed code locally and taken a fairly regular snapshot whenever I reach a significant point in development, e.g. a working build. So I have a long-ish list of about 40 folders, each folder being a snapshot e.g. in ascending date YYYYMMDD order, e.g.:- 20100523 20100614 20100721 20100722 20100809 20100901 20101001 20101003 20101104 20101119 20101203 20101218 20110102 I'm looking for a script to import each of these snapshots into GIT. The end result being that the latest code is the same as the last snapshot, and other editions are accessible and are as numbered. Some other requirements: that the latest edition is not cumulative of the previous snapshots, i.e., files that appeared in older snapshots but which don't appear in later ones (e.g. due to refactoring etc.) should not appear in the latest edition of the code. meanwhile, there should be continuity between files that do persist between snapshots. I would like GIT to know that there are previous editions of these files and not treat them as brand new files within each edition. Some background about my aim: I need to formally revision control this work rather than keep local private snapshot copies. I plan to release this work as open source, so version controlling would be highly recommended I am evaluating some of the current popular version control systems (Subversion and GIT) BUT I definitely need a working solution in GIT as well as subversion. I'm not looking to be persuaded to use one particular tool, I need a solution for each tool I am considering. (I haved posted an answer separately for each tool so separate camps of folks who have expertise in GIT and Subversion will be able to give focused answers on one or the other). The same but separate question for Subversion: Script/tool to import series of snapshots, each being a new revision, into Subversion, populating source tree?

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• Traverse tree with results. Maybe type in Java?

  - by Angelo.Hannes

  I need to check a tree's node state. It can either be OK or NOT_OK. But that state is dependent on its children. So for a node to be OK, every of its children needs to be OK. If one or more of its children is NOT_OK the whole node is NOT_OK. To determine the state of a node I need to aggregate some properties of the node. So I thought of two possible implementations. And they are more or less covered in this question: Why is Option/Maybe considered a good idea and checked exceptions are not? Exception I could pass the properties up the recursion path, and throw an exception if something went wrong. Maybe I implement an Maybe type and let it either hold an error or the aggregated properties. Maybe it is more an Either. I tend towards the last option. And I'm thinking of an enum with two objects. Where I can additionally set those aggregated properties. Am I on the right track? I'm not familiar with the new JDK8 functional stuff. But I'm stuck on JDK7 anyway, so please focus on JDK7.

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• 13.10 Saucy login issues; black screen, loop, and freeze

  - by user135598

  Once upgraded to I 13.10 I was not able to get past the login screen. I had the black screen. Also; I can not log on with low graphics mode from recovery either. It makes no difference if I try default graphics driver or not. Then after running sudo install -f from recovery root prompt I got a login loop. I have purged fglrx, fglrx-legacy, and nvidia-current. I updated my repository with xorg-edgers and reinstalled nvidia-current. Now it semi-freezes at the login screen when I try to log on as my normal user. I say 'semi' because I can still use my mouse to click on the upper right hand Ubuntu logo and Shut Down or Restart the PC. I still cannot log on with my user name, but I can through the Guest login. While logged in as Guest I added a new user account with administrative privileges. I CAN log into this account without problem and from here am able to see that my .dmrc file in my original account reads: [Desktop] Session=XBMC I have changed 'Session=XBMC' to 'Session=ubuntu' and rebooted, but to no avail. The file resets itself and makes a backup of my changes. Any help would be greatly appreciated.

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• WPF wrappanel item alignment problem when scrolling

  - by Jayho

  Someone help me out pls. I set a wrapPanel in a listbox itemPanelTemplate, Also, I already set the ScrollViewer.CanContentScroll="True". But why the listbox items are not scrolling up/down by ITEM one by one? The scroll style is still by PIXEL. Is anyone help me? <Grid> <ListBox x:Name="testListbox" ScrollViewer.CanContentScroll="True"> <ListBox.ItemsPanel> <ItemsPanelTemplate> <WrapPanel Width="200" ScrollViewer.CanContentScroll="True"/> </ItemsPanelTemplate> </ListBox.ItemsPanel> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> <ListBoxItem Background="LimeGreen" BorderBrush="Black" BorderThickness="3" ScrollViewer.CanContentScroll="True"> <Image Height="50" Width="80" ScrollViewer.CanContentScroll="True"/> </ListBoxItem> </ListBox> </Grid>

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• Programmatically swap colors from a loaded bitmap to Red, Green, Blue or Gray, pixel by pixel.

  - by eyeClaxton

  Download source code here: http://www.eyeClaxton.com/download/delphi/ColorSwap.zip I would like to take a original bitmap (light blue) and change the colors (Pixel by Pixel) to the red, green, blue and gray equivalence relation. To get an idea of what I mean, I have include the source code and a screen shot. Any help would be greatly appreciated. If more information is needed, please feel free to ask. If you could take a look at the code below, I have three functions that I'm looking for help on. The functions "RGBToRed, RGBToGreen and RGBToRed" I can't seem to come up with the right formulas. unit MainUnit; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, ExtCtrls, StdCtrls; type TMainFrm = class(TForm) Panel1: TPanel; Label1: TLabel; Panel2: TPanel; Label2: TLabel; Button1: TButton; BeforeImage1: TImage; AfterImage1: TImage; RadioGroup1: TRadioGroup; procedure FormCreate(Sender: TObject); procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; var MainFrm: TMainFrm; implementation {$R *.DFM} function RGBToGray(RGBColor: TColor): TColor; var Gray: Byte; begin Gray := Round( (0.90 * GetRValue(RGBColor)) + (0.88 * GetGValue(RGBColor)) + (0.33 * GetBValue(RGBColor))); Result := RGB(Gray, Gray, Gray); end; function RGBToRed(RGBColor: TColor): TColor; var Red: Byte; begin // Not sure of the algorithm for this color Result := RGB(Red, Red, Red); end; function RGBToGreen(RGBColor: TColor): TColor; var Green: Byte; begin // Not sure of the algorithm for this color Result := RGB(Green, Green, Green); end; function RGBToBlue(RGBColor: TColor): TColor; var Blue: Byte; begin // Not sure of the algorithm for this color Result := RGB(Blue, Blue, Blue); end; procedure TMainFrm.FormCreate(Sender: TObject); begin BeforeImage1.Picture.LoadFromFile('Images\RightCenter.bmp'); end; procedure TMainFrm.Button1Click(Sender: TObject); var Bitmap: TBitmap; I, X: Integer; Color: Integer; begin Bitmap := TBitmap.Create; try Bitmap.LoadFromFile('Images\RightCenter.bmp'); for X := 0 to Bitmap.Height do begin for I := 0 to Bitmap.Width do begin Color := ColorToRGB(Bitmap.Canvas.Pixels[I, X]); case Color of $00000000: ; // Skip any Color Here! else case RadioGroup1.ItemIndex of 0: Bitmap.Canvas.Pixels[I, X] := RGBToBlue(Color); 1: Bitmap.Canvas.Pixels[I, X] := RGBToRed(Color); 2: Bitmap.Canvas.Pixels[I, X] := RGBToGreen(Color); 3: Bitmap.Canvas.Pixels[I, X] := RGBToGray(Color); end; end; end; end; AfterImage1.Picture.Graphic := Bitmap; finally Bitmap.Free; end; end; end. Okay, I apologize for not making it clearer. I'm trying to take a bitmap (blue in color) and swap the blue pixels with another color. Like the shots below.

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• SEO issue red characters in source code? &gt; Why? Syntax highlighting? browser source code?

  - by judi

  SEO issue red characters Hi all I'm building webstes using dreamweaver, but when I look at the source code it is red for &quot; characters. I'm told anything appearing in red puts off Google's seo. Does anyone know why this appears in red? For example when I view code source on the site i get the gt; in red <a href="miss-sold-mortgages.html" class="darkblue">Find out more&gt;&gt;</a></span> </div> Thanks for your help Regards Judi

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• List of resources for database continuous integration

  - by David Atkinson

  Because there is so little information on database continuous integration out in the wild, I've taken it upon myself to aggregate as much as possible and post the links to this blog. Because it's my area of expertise, this will focus on SQL Server and Red Gate tooling, although I am keen to include any quality articles that discuss the topic in general terms. Please let me know if you find a resource that I haven't listed! General database Continuous Integration · What is Database Continuous Integration? (David Atkinson) · Continuous Integration for SQL Server Databases (Troy Hunt) · Installing NAnt to drive database continuous integration (David Atkinson) · Continuous Integration Tip #3 - Version your Databases as part of your automated build (Doug Rathbone) · How the "migrations" approach makes database continuous integration possible (David Atkinson) · Continuous Integration for the Database (Keith Bloom) Setting up Continuous Integration with Red Gate tools · Continuous integration for databases using Red Gate tools - A technical overview (White Paper, Roger Hart and David Atkinson) · Continuous integration for databases using Red Gate SQL tools (Product pages) · Database continuous integration step by step (David Atkinson) · Database Continuous Integration with Red Gate Tools (video, David Atkinson) · Database schema synchronisation with RedGate (Vincent Brouillet) · Database continuous integration and deployment with Red Gate tools (David Duffett) · Automated database releases with TeamCity and Red Gate (Troy Hunt) · How to build a database from source control (David Atkinson) · Continuous Integration Automated Database Update Process (Lance Lyons) Other · Evolutionary Database Design (Martin Fowler) · Recipes for Continuous Database Integration: Evolutionary Database Development (book, Pramod J Sadalage) · Recipes for Continuous Database Integration (book, Pramod Sadalage) · The Red Gate Guide to SQL Server Team-based Development (book, Phil Factor, Grant Fritchey, Alex Kuznetsov, Mladen Prajdic) · Using SQL Test Database Unit Testing with TeamCity Continuous Integration (Dave Green) · Continuous Database Integration (covers MySQL, Perason Education) Technorati Tags: SQL Server,Continous Integration

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• Is there a way communicate or measure levels of abstraction?

  - by hydroparadise

  I'll be the first to say that this question is a bit... out there. But here are a couple questions I bear in mind : Is abstraction continuous or discrete? Is there a single unit of abstraction? But I'm not sure those questions are truly answerable or even really makes sence. My naive answer would be something along the lines of abitrarily discrete but not necescarily having a single unit measure. Here's what I mean... Take a Black Labrador; an abstraction that could be made is that a Black Lab is a type of animal. [Animal]<--[Black Lab] A Black Lab is also a type of Dog. [Dog]<--[Black Lab] One way to establish a degree of abstraction is by comparing the two the abstractions. We could say that [Animal] is more abstract than [Dog] in respect to a Black Lab. It just so happens [Animal] can also be used as an abstraction of [Dog] So, we might end up with something like [Animal]<--[Dog]<--[Black Lab] With the model above, one might be inclined to say that there's two hops of abstraction to get from [Black Lab] to [Animal]. But you can't exactly tell somebody they need one level abstraction and reasonalby expect they will come up with [Dog] given they aren't explicity given the options above. If I needed to tell someobody in a single email that they needed an abstract class with out knowing what that abstract class is, is there a way to communaticate a degree of abstraction such that they might end up on Dog instead of Animal? As a side note, what area of study might this type of analysis fall under?

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• Finance: Friends, not foes!

  - by red@work

  After reading Phil's blog post about his experiences of working on reception, I thought I would let everyone in on one of the other customer facing roles at Red Gate... When you think of a Credit Control team, most might imagine money-hungry (and often impolite) people, who will do nothing short of hunting people down until they pay up. Well, as with so many things, not at Red Gate! Here we do things a little bit differently.   Since joining the Licensing, Invoicing and Credit Control team at Red Gate (affectionately nicknamed LICC!), I have found it fantastic to work with people who know that often the best way to get what you want is by being friendly, reasonable and as helpful as possible. The best bit about this is that, because everyone is in a good mood, we have a great working atmosphere! We are definitely a very happy team. We laugh a lot, even when dealing with the serious matter of playing table football after lunch. The most obvious part of my job is bringing in money. There are few things quite as satisfying as receiving a big payment or one that you've been chasing for a long time. That being said, it's just as nice to encounter the companies that surprise you with a payment bang on time after little or no chasing. It's always a pleasure to find these people who are generous and easy to work with, and so they always make me smile, too. As I'm in one of the few customer facing roles here, I get to experience firsthand just how much Red Gate customers love our software and are equally impressed with our customer service. We regularly get replies from people thanking us for our help in resolving a problem or just to simply say that they think we're great. Or, as is often the case, that we 'rock and are awesome'! When those are the kinds of emails you have to deal with for most of the day, I would challenge anyone to be unhappy! The best thing about my work is that, much like Phil and his counterparts on reception, I get to talk to people from all over the world, and experience their unique (and occasionally unusual) personality traits. I deal predominantly with customers in the US, so I'll be speaking to someone from a high flying multi-national in New York one minute, and then the next phone call will be to a small office on the outskirts of Alabama. This level of customer involvement has led to a lot of interesting anecdotes and plenty of in-jokes to keep us amused! Obviously there are customers who are infuriating, like those who simply tell us that they will pay "one day", and that we should stop chasing them. Then there are the people who say that they ordered the tools because they really like them, but they just can't afford to actually pay for them at the moment. Thankfully these situations are relatively few and far between, and for every one customer that makes you want to scream, there are far, far more that make you smile!

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• Do we need to adopt a black-box asset our project is inheriting from its predecessor?

  - by Tom Anderson

  Our client has an eCommerce site which was developed by an in-house team, and is now showing its age. I work for a firm brought in as external contractors to build a replacement. Part of the current site is a Flash viewer applet which displays media about the product - zoom-able images, 360-degree views, movies, and so on. We need to show the same media the current site does, so we are simply reusing the viewer. The viewer is embedded on a page in the usual way, and told what media to show by means of an XML file it loads from our server, which is pretty simple for us to generate. We've got this working; it was pretty straightforward. But what else do we need to do? The thing is, as far as we're concerned, the viewer is a binary blob which is served from the client's content-distribution network. We embed it, feed it some XML, and it does its job, but we have no power over its internals. It's completely opaque to us - a black box. We can use it to do what it does, but we can't change it, so if we ever need to do something different, we're stuffed. We're building this site for the client, and when we're done, we'll hand it over for them to maintain. We won't be doing the maintenance ourselves. There's a small team within the client who are working as part of our team, and who will be the ones doing the maintenance. That team only includes one person from the team that built the old site, and it's not someone who knows the image viewer. The people who do know the image viewer are not slated to join our team when our system replaces theirs - they'll be moved to other projects. The documentation on the viewer is extremely thin, and as far as i know doesn't cover the internals at all. My worry is that if someone doesn't take some positive action, all knowledge of the internal workings of the viewer - even down to where the source code for it is - will be lost. It's possible it already has been. Is this something to worry about? If so, whose job is it to worry about it? What should they do about it once they've got worried?

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• Unable to boot into 11.10 in normal (get a black screen) OR recovery (get just a flashing cursor, no cli)

  - by user1092284

  Okay, so I had a dual boot of Tango Studio (based on Ubuntu 10.04) and Windows XP. Yesterday I downloaded the .iso for Ubuntu 11.10 and attempted to install from a USB (my BIOS won't normally boot from USB but I had PLOP boot manager on a CD). I booted up Ubuntu from the USB and then from there formatted the partition with Tango on and installed Ubuntu 11.10. On booting up I came into Grub rescue mode. So I booted up from the USB again and used boot-repair to reinstall Grub. After this I would see the normal Grub menu, but on choosing Ubuntu I would come to a black screen. On choosing recovery mode it would begin starting normally with no obvious errors but instead of coming to a cli I would just get a blank screen with a flashing cursor on the top left, not accepting any input. I have since reformatted and reinstalled from a CD rather than USB and had the exact same problem. I used boot-repair again and the result is the same. Output of the most recent boot-repair is at http://paste.ubuntu.com/869805/ I have also tried editing the ubuntu grub entry and replacing quiet with text nomodeset as I saw in an answer to another question. This got me a bit further - I saw the purple ubuntu loading screen but still came to a blank screen after that. Anyway, in most of the other questions in which that is brought up the user is still able to boot into recovery, while I am not. Can anyone help? Thanks in advance, let me know if there's any more info I need to provide! EDIT FOR MORE INFO: I read something saying it's quiet splash that should be replaced with nomodeset. Earlier I had left splash in the line. So i tried it this way and it froze after displaying the following text: fsck from util-linux 2.19.1 mountall: Plymouth command failed mountall: Disconnected from Plymouth /dev/sda5:clean, 139359/1741488 files, 745830/6961125 blocks From a bit of googling it doesn't look like plymouth is essential, but I've checked and I do have the most current versions of mountall and plymouth installed so I don't know why there's a problem EDIT FOR MORE INFO AGAIN: I used dkpg --reconfigure plymouth cause I saw it mentioned in another forum and it still says plymouth command failed on boot

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• Muliple Foreground Colors in Powershell in One Command.

  - by Mark Tomlin

  I want to output many different foreground colors with one statement. PS C:\> Write-Host "Red" -ForegroundColor Red Red This output is red. PS C:\> Write-Host "Blue" -ForegroundColor Blue Blue This output is blue. PS C:\> Write-Host "Red", "Blue" -ForegroundColor Red, Blue Red Blue This output is magenta, but I want the color to be Red for the word red, and blue for the word blue via the one command. How can I do that?

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• How do I install the pdo_mysql driver on Red Hat Enterprise Linux 6.1?

  - by Will Martin

  I have a RHEL box running PHP 5.3.3, which was installed using the binary packages provided by yum. I have installed the php-pdo package: # yum info php-pdo Loaded plugins: product-id, rhnplugin, subscription-manager Updating Red Hat repositories. Installed Packages Name : php-pdo Arch : x86_64 Version : 5.3.3 Release : 3.el6_1.3 Size : 168 k Repo : installed From repo : rhel-x86_64-server-6 Summary : A database access abstraction module for PHP applications URL : http://www.php.net/ License : PHP Description : The php-pdo package contains a dynamic shared object that will add : a database access abstraction layer to PHP. This module provides : a common interface for accessing MySQL, PostgreSQL or other : databases. It appears to be working correctly for SQLite databases, but not MySQL. There's no file including pdo_mysql.so in /etc/php.d, and there is no copy of pdo_mysql.so in /usr/lib64/php/modules. I'm pretty sure I just need the driver file and a line in the PHP configuration. A yum search pdo mysql didn't turn up any useful packages, and Google has failed me. If I were on Ubuntu or Debian, I'd apt-get install php5-mysql and be done with it. So ... where in Red Hat land do I get a copy of pdo_mysql.so, and install it properly?

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