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• Big Data – Interacting with Hadoop – What is Sqoop? – What is Zookeeper? – Day 17 of 21

  - by Pinal Dave

  In yesterday’s blog post we learned the importance of the Pig and Pig Latin in Big Data Story. In this article we will understand what is Sqoop and Zookeeper in Big Data Story. There are two most important components one should learn when learning about interacting with Hadoop – Sqoop and Zookper. What is Sqoop? Most of the business stores their data in RDBMS as well as other data warehouse solutions. They need a way to move data to the Hadoop system to do various processing and return it back to RDBMS from Hadoop system. The data movement can happen in real time or at various intervals in bulk. We need a tool which can help us move this data from SQL to Hadoop and from Hadoop to SQL. Sqoop (SQL to Hadoop) is such a tool which extract data from non-Hadoop data sources and transform them into the format which Hadoop can use it and later it loads them into HDFS. Essentially it is ETL tool where it Extracts, Transform and Load from SQL to Hadoop. The best part is that it also does extract data from Hadoop and loads them to Non-SQL (or RDBMS) data stores. Essentially, Sqoop is a command line tool which does SQL to Hadoop and Hadoop to SQL. It is a command line interpreter. It creates MapReduce job behinds the scene to import data from an external database to HDFS. It is very effective and easy to learn tool for nonprogrammers. What is Zookeeper? ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. In other words Zookeeper is a replicated synchronization service with eventual consistency. In simpler words – in Hadoop cluster there are many different nodes and one node is master. Let us assume that master node fails due to any reason. In this case, the role of the master node has to be transferred to a different node. The main role of the master node is managing the writers as that task requires persistence in order of writing. In this kind of scenario Zookeeper will assign new master node and make sure that Hadoop cluster performs without any glitch. Zookeeper is the Hadoop’s method of coordinating all the elements of these distributed systems. Here are few of the tasks which Zookeepr is responsible for. Zookeeper manages the entire workflow of starting and stopping various nodes in the Hadoop’s cluster. In Hadoop cluster when any processes need certain configuration to complete the task. Zookeeper makes sure that certain node gets necessary configuration consistently. In case of the master node fails, Zookeepr can assign new master node and make sure cluster works as expected. There many other tasks Zookeeper performance when it is about Hadoop cluster and communication. Basically without the help of Zookeeper it is not possible to design any new fault tolerant distributed application. Tomorrow In tomorrow’s blog post we will discuss about very important components of the Big Data Ecosystem – Big Data Analytics. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Big Data, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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• Problem with sprite direction and rotation

  - by user2236165

  I have a sprite called Tool that moves with a speed represented as a float and in a direction represented as a Vector2. When I click the mouse on the screen the sprite change its direction and starts to move towards the mouseclick. In addition to that I rotate the sprite so that it is facing in the direction it is heading. However, when I add a camera that is suppose to follow the sprite so that the sprite is always centered on the screen, the sprite won't move in the given direction and the rotation isn't accurate anymore. This only happens when I add the Camera.View in the spriteBatch.Begin(). I was hoping anyone could maybe shed a light on what I am missing in my code, that would be highly appreciated. Here is the camera class i use: public class Camera { private const float zoomUpperLimit = 1.5f; private const float zoomLowerLimit = 0.1f; private float _zoom; private Vector2 _pos; private int ViewportWidth, ViewportHeight; #region Properties public float Zoom { get { return _zoom; } set { _zoom = value; if (_zoom < zoomLowerLimit) _zoom = zoomLowerLimit; if (_zoom > zoomUpperLimit) _zoom = zoomUpperLimit; } } public Rectangle Viewport { get { int width = (int)((ViewportWidth / _zoom)); int height = (int)((ViewportHeight / _zoom)); return new Rectangle((int)(_pos.X - width / 2), (int)(_pos.Y - height / 2), width, height); } } public void Move(Vector2 amount) { _pos += amount; } public Vector2 Position { get { return _pos; } set { _pos = value; } } public Matrix View { get { return Matrix.CreateTranslation(new Vector3(-_pos.X, -_pos.Y, 0)) * Matrix.CreateScale(new Vector3(Zoom, Zoom, 1)) * Matrix.CreateTranslation(new Vector3(ViewportWidth * 0.5f, ViewportHeight * 0.5f, 0)); } } #endregion public Camera(Viewport viewport, float initialZoom) { _zoom = initialZoom; _pos = Vector2.Zero; ViewportWidth = viewport.Width; ViewportHeight = viewport.Height; } } And here is my Update and Draw-method: protected override void Update (GameTime gameTime) { float elapsed = (float)gameTime.ElapsedGameTime.TotalSeconds; TouchCollection touchCollection = TouchPanel.GetState (); foreach (TouchLocation tl in touchCollection) { if (tl.State == TouchLocationState.Pressed || tl.State == TouchLocationState.Moved) { //direction the tool shall move towards direction = touchCollection [0].Position - toolPos; if (direction != Vector2.Zero) { direction.Normalize (); } //change the direction the tool is moving and find the rotationangle the texture must rotate to point in given direction toolPos += (direction * speed * elapsed); RotationAngle = (float)Math.Atan2 (direction.Y, direction.X); } } if (direction != Vector2.Zero) { direction.Normalize (); } //move tool in given direction toolPos += (direction * speed * elapsed); //change cameracentre to the tools position Camera.Position = toolPos; base.Update (gameTime); } protected override void Draw (GameTime gameTime) { graphics.GraphicsDevice.Clear (Color.Blue); spriteBatch.Begin (SpriteSortMode.BackToFront, BlendState.AlphaBlend, null, null, null, null, Camera.View); spriteBatch.Draw (tool, new Vector2 (toolPos.X, toolPos.Y), null, Color.White, RotationAngle, originOfToolTexture, 1, SpriteEffects.None, 1); spriteBatch.End (); base.Draw (gameTime); }

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• Nhibernate 2.1 and mysql 5 - InvalidCastException on Setup

  - by Nash

  Hello there, I am trying to use NHibernate with Spring.Net und mySQL 5. However, when setting up the connection and creating the SessionFactoryObject, I get this InvalidCastException: NHibernate seems to cast MySql.Data.MySqlClient.MySqlConnection to System.Data.Common.DbConnection which causes the exception. System.InvalidCastException wurde nicht behandelt. Message="Das Objekt des Typs \"MySql.Data.MySqlClient.MySqlConnection\" kann nicht in Typ \"System.Data.Common.DbConnection\" umgewandelt werden." Source="NHibernate" StackTrace: bei NHibernate.Tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.Prepare() in c:\CSharp\NH\nhibernate\src\NHibernate\Tool\hbm2ddl\SuppliedConnectionProviderConnectionHelper.cs:Zeile 25. bei NHibernate.Tool.hbm2ddl.SchemaMetadataUpdater.GetReservedWords(Dialect dialect, IConnectionHelper connectionHelper) in c:\CSharp\NH\nhibernate\src\NHibernate\Tool\hbm2ddl\SchemaMetadataUpdater.cs:Zeile 43. bei NHibernate.Tool.hbm2ddl.SchemaMetadataUpdater.Update(ISessionFactory sessionFactory) in c:\CSharp\NH\nhibernate\src\NHibernate\Tool\hbm2ddl\SchemaMetadataUpdater.cs:Zeile 17. bei NHibernate.Impl.SessionFactoryImpl..ctor(Configuration cfg, IMapping mapping, Settings settings, EventListeners listeners) in c:\CSharp\NH\nhibernate\src\NHibernate\Impl\SessionFactoryImpl.cs:Zeile 169. bei NHibernate.Cfg.Configuration.BuildSessionFactory() in c:\CSharp\NH\nhibernate\src\NHibernate\Cfg\Configuration.cs:Zeile 1090. bei OrmTest.Program.Main(String[] args) in C:\Users\Max\Documents\Visual Studio 2008\Projects\OrmTest\OrmTest\Program.cs:Zeile 24. bei System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args) bei System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) bei Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() bei System.Threading.ThreadHelper.ThreadStart_Context(Object state) bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) bei System.Threading.ThreadHelper.ThreadStart() InnerException: I am using the programmatically setup approach in order to get a quick NHibernate Setup. Here is the setup Code: Configuration config = new Configuration(); Dictionary props = new Dictionary(); props.Add("dialect", "NHibernate.Dialect.MySQL5Dialect"); props.Add("connection.provider", "NHibernate.Connection.DriverConnectionProvider"); props.Add("connection.driver_class", "NHibernate.Driver.MySqlDataDriver"); props.Add("connection.connection_string", "Server=localhost;Database=orm_test;User ID=root;Password=password"); props.Add("proxyfactory.factory_class", "NHibernate.ByteCode.Spring.ProxyFactoryFactory, NHibernate.ByteCode.Spring"); config.AddProperties(props); config.AddFile("Person.hbm.xml"); ISessionFactory factory = config.BuildSessionFactory(); ISession session = factory.OpenSession(); Is something missing? I downloaded the current mysql Connector from the mysql Website.

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• Visual Studio 2010 crashes nearly every time when closing

  - by Andrei Drynov

  Mostly it happens if we open a team project from tfs 2008 or tfs 2010, but crashes can happen any time. When VS is closing down, it crashes nearly every time. Tried trial RTM and our MSDN download - same story. Tried on three different PCs - same issue. Tried on 32 and 64-bit Windows 7 and Windows Server 2008 R2 - crashes. Is it just our luck or does it happen to you to?

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• bulk insert image from relative path

  - by Markus

  Hi, I wonder if some can help me out with this little problem. I have the following insert statement: insert into symbol (sy_id, sy_fg_color, sy_bg_color, sy_icon) select 302, 0, 16245177, sy_icon = (select * from openrowset(bulk 'K:\mypath\icons\myicon.png', single_blob) as image) Is it possible to make the path relative in any way? I'm using TFS to deploy the database, so if it's not possible to make it relative with T-SQL, maybe it can be done with a little help from TFS/Visual Studio deploy?

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• Coded UI Test - How to change the exe it runs

  - by Vaccano

  I created a Coded UI Test from a Microsoft Test Manager recording. The exe it runs is the one the tester recorded against. I want this to be a test I run with my build. How do I change the exe that the coded UI test uses to be the output of: The TFS Build when a TFS Build is being run The local build when the test is being run on my machine.

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• how to build xml schema

  - by aman

  is there any tool that support xml schema building

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• How to run a custom action after install which can run in quiet or a UI after Install (WIX)

  - by Jamie

  Hi, I basically want to able to run an command line tool that already exists on the desired machine against the directory the files were run to. I.e The Installer does the following: Specify a location for the files to go into (INSTALLOCATION variable) Then after copying has finished run a tool which will zip the files and attach them to attach them to another application. <CustomAction Id="InstallTo" Return="check" Directory="INSTALLLOCATION" Execute="immediate" ExeCommand='"C:\MyTool\Here\Tool.exe" -ad [INSTALLLOCATION] Poop 1.0'/> <InstallExecuteSequence> <Custom Action="InstallTo" After="InstallFinalize">$InstallTo&gt;2</Custom> </InstallExecuteSequence> At the moment I'm not sure anyuthing is being called, is there a way to basically have this two step install and report progress if the tool failed/doesn't exist etc. Thanks, Jamie

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• Switching VS2010 to use Windows 7.1 SDK

  - by freefallr

  I've used VS2008 on my development machine for some years now, with windows SDK v7.1. I've installed VS2010, and it's using the Windows SDK v7.0a, but I need it to use the Windows 7.1 SDK (which I had installed prior to installing VS2010). When I run the Windows SDK 7.1 configuration tool, to switch the Windows SDK in use, the tool updates for VS2008, but not for VS2010. The message it reports is: "The Windows SDK Configuration Tool has successfully set Windows SDK version v7.1 as the current version for Visual Studio 2008" The configuration tool is installed with the Windows 7.1 SDK and is found here: "C:\Program Files\Microsoft SDKs\Windows\v7.1\Setup\WindowsSdkVer.exe" VS2010 continues to use WSDK 7.0a, which extremely frustrating, as I need to do DirectShow development (so I need to build the baseclasses, which aren't released with 7.0a release of WSDK). Would I be correct in assuming that it's not updating VS2010 settings because VS2010 wasn't installed at the time that I installed Windows 7.1 SDK? Can I fix this manually, or should I uninstall Windows 7.1 SDK, then reinstall it? Any other suggestions / workarounds for this?

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• difference between signtool and sn or al for assembly signing

  - by sveerap

  Hi, I see tool like SN which generates private/public key pair for signing an assembly. and using AL tool we can assign a strong name to an assembly And we have also Sign tool which is used for signing the assembly (probably for using with certificates exclusively?). What is the exact difference between the two?. Is it sign tool have to be used when working with certificates and can it we acheive it SN?. or are they totally different.? Please help.

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• Migrating .NET/MySQL app. to DB2

  - by RPK

  I want to migrate my existing desktop Windows .NET 3.5 app. that uses MySQL as backend to DB2 Express C. I downloaded IBM Migration Toolkit to migrate the database. I have further queries: How accurate is IBM Migration Toolkit? Are there any issues? For the application, just changing the connection string will do or something else?

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• how to save nested form attributes to database

  - by siulamvictor

  I am not really understand how's the nested attributes work in Rails. I have 2 models, Accounts and Users. Accounts has_many Users. When a new user filled in the form, Rails reported User(#2164802740) expected, got Array(#2148376200) Is that Rails cannot read the nested attributes from the form? How can I fix it? How can I save the data from nested attributes form to database? Thanks all~ Here are the MVCs: Account Model class Account < ActiveRecord::Base has_many :users accepts_nested_attributes_for :users validates_presence_of :company_name, :message => "companyname is required." validates_presence_of :company_website, :message => "website is required." end User Model class User < ActiveRecord::Base belongs_to :account validates_presence_of :user_name, :message => "username too short." validates_presence_of :password, :message => "password too short." end Account Controller class AccountController < ApplicationController def new end def created end def create @account = Account.new(params[:account]) if @account.save redirect_to :action => "created" else flash[:notice] = "error!!!" render :action => "new" end end end Account/new View <h1>Account#new</h1> <% form_for :account, :url => { :action => "create" } do |f| %> <% f.fields_for :users do |ff| %> <p> <%= ff.label :user_name %><br /> <%= ff.text_field :user_name %> </p> <p> <%= ff.label :password %><br /> <%= ff.password_field :password %> </p> <% end %> <p> <%= f.label :company_name %><br /> <%= f.text_field :company_name %> </p> <p> <%= f.label :company_website %><br /> <%= f.text_field :company_website %> </p> <% end %> Account Migration class CreateAccounts < ActiveRecord::Migration def self.up create_table :accounts do |t| t.string :company_name t.string :company_website t.timestamps end end def self.down drop_table :accounts end end User Migration class CreateUsers < ActiveRecord::Migration def self.up create_table :users do |t| t.string :user_name t.string :password t.integer :account_id t.timestamps end end def self.down drop_table :users end end Thanks everyone. :)

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• write error: Broken pipe

  - by Fahim

  Hi, I have to run a tool on around 300 directories. Each run take around 1 minute to 30 minute or even more than that. So, I wrote a python script having a loop to run the tool on all directories one after another. my python script has code something like: for directory in directories: os.popen('runtool_exec ' + directory) But when I run the python script I get the following error messages repeatedly: .. tail: write error: Broken pipe date: write error: Broken pipe .. All I do is login on a remote server using ssh where the tool, python script, and subject directories are kept. When I individually run the tool from command prompt using command like: runtool_exec directory it works fine. "broken pipe" error is coming only when I run using the python script. Any idea, workaround? Please suggest. Thanks. Fahim

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• Eclipse CDT configuaration

  - by Sirish Kumar

  Hi, I have installed eclipse with CDT. I have GNU compiler tool chain installed on my PC. But I need to replace the GNU compiler tool chain with our own Tool chain, how can I do this

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• DRY Authenticated Tasks in Cocoa (with distributed objects)

  - by arbales

  I'm kind of surprise/infuriated that the only way for me to run an authenticated task, like perhaps sudo gem install shi*t, is to make a tool with pre-written code. I'm writing a MacRuby application, which doesn't seem to expose the KAuthorization* constants/methods. So.. I learned Cocoa and Objective-C. My application creates a object, serves it and calls the a tool that elevates itself and then performs a selector on a distributed object (in the tool's thread). I hoped that the distributed object's methods would evaluated inside the tool, so I could use delegation to create "privileged" tasks. If this won't work, don't try to save it, I just want a DRY/cocoa solution. AuthHelper.m //AuthorizationExecuteWithPrivileges of this. AuthResponder* my_responder = [AuthResponder sharedResponder]; // Gets the proxy object (and it's delegate) NSString *selector = [NSString stringWithUTF8String:argv[3]]; NSLog(@"Performing selector: %@", selector); setuid(0); if ([[my_responder delegate] respondsToSelector:NSSelectorFromString(selector)]){ [[my_responder delegate] performSelectorOnMainThread:NSSelectorFromString(selector) withObject:nil waitUntilDone:YES]; } RandomController.m - (void)awakeFromNib { helperToolPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingString:@"/AuthHelper"]; delegatePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingString:@"/ABExtensions.rb"]; AuthResponder* my_responder = [AuthResponder initAsService]; [my_responder setDelegate:self]; } -(oneway void)install_gems{ NSArray *args = [NSArray arrayWithObjects: @"gem", @"install", @"sinatra", nil]; [NSTask launchedTaskWithLaunchPath:@"/usr/bin/sudo" arguments:args]; NSLog(@"Ran AuthResponder.delegate.install_gems"); // This prints. } ... other privileges tasks. "sudo gem update --system" for one. I'm guessing the proxy object is performing the selector in it's own thread, but I want the current (privileged thread) to do it so I can use sudo. Can I force the distributed object to evaluate the selector on the tool's thread? How else can I accomplish this dryly/cocoaly?

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• How to fix this window.open memory leak?

  - by DotnetShadow

  Hi there, I was recently looking at this memory leak tool sIEve: http://home.orange.nl/jsrosman/ So I decided to test out the tool by creating a main page that will open up a popup window. I started by creating 3 pages: index.html, page1.html and page2.html, the index.html page will open a child window (popup) linking to page1.html. Page1 will have a anchor tag that links to page2.html, while page2 will have a link back to page1.html PROBLEM So in the tool I entered the index.html page, popup window opened to page1.html, I then clicked the page2 link, no leaks detected yet. While I'm on page2 I click the link back to page1, and that's where the tool claims there is a link. The leak seems to be happening on the index.html page and I have no idea as to why it would be doing that. Even more concerning is that I can see elements that the tool detects that aren't even on my page. Does anyone have any experience with this tool or know if this really is a memory leak? Any samples of showing how to achieve what I'm doing without memory leaks? INDEX.HTML <script type="text/javascript"> MYLEAK = function() { var childWindow = null; function showWindow() { childWindow = window.open("page1.html", "myWindow"); return false; } return { init: function() { $("#window-link").bind("click", showWindow); } } }(); </script> </head> <body> <a id="window-link" href="#" on>Open Window</a> <script type="text/javascript"> $(document).ready(function() { MYLEAK.init(); }); </script> </body> </html> PAGE1.HTML <html> <body> <h1>Page 1</h1> <a href="page2.html">Page2</a> </body> </html> PAGE2.HTML <html> <body> <h1>Page 2</h1> <a href="page1.html">Page1</a> </body> </html> Appreciate your efforts.

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• What design patterns are used in diagramming tools?

  - by TheMachineCharmer

  Diagram.net is good diagramming tool. I need to understand what design patterns are used by this tool so that I can understand how it works. What design patterns are used in this tool? What design patterns are generally used for diagramming tools? I would also like to know how can I use this to develop very simple diagramming tool (Only rectangular nodes and straight links). NOTE/Caution: I am doing this for FUN so please don't direct me to existing tools(I might down vote.. just kiddin ;).

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• What design patterns are used here?

  - by TheMachineCharmer

  Diagram.net is good diagramming tool. I need to understand what design patterns are used by this tool so that I can understand how it works. What design patterns are used in this tool? What design patterns are generally used for diagramming tools?

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• How to set up my belongs_to and has_many reference

  - by dagda1

  Hi, I have an ExpenseType object that I have created with the following migration: class CreateExpenseTypes < ActiveRecord::Migration def self.up create_table :expense_types do |t| t.column :name, :string, :null => false t.timestamps end end I can see the table name is the pluralised expense_types. My question is, how do I reference this type in a belongs_to relationship? Is it: belongs_to :expensetype or is it belongs_to :expense_type I do not seem able to set it up correctly. Cheers

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• RESTFul and Hibernate

  - by user107303

  Is there a tool that can create RESTFul java services from classes generated with hibernate tool?

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• Flash cs5 anti-decompiler ?

  - by asksuperuser

  Is there any tool that prevents decompilation ?

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• how to automate / script processes like signups .

  - by silverkid

  which is the best tool for this - Automation of signup process to a website , e.g an email signup The tool should be able to take data from an external data file like an excel of csv file this data file would contain data such as first name , last name , username, password etc. basic data required during an email signup . I am imagining the data file to contain of each field in a seperate column and each row to contain data for different registration / user. At the places where manual intervention is required like image verification etc. the tool should be able to pause the script until manual bit is done then continue with the script. What is the best way to do this - an automation tool , or any scripting language - please suggest .

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• open,edit and save xml file with schema using php

  - by Neat

  Hy... I'm new in XML Schema, XSL,... (I have basic understanding) On web page: http://w3schools.com/xsl/xsl_editxml.asp is shown example for open,edit,save xml file, but with asp. Do anyone know how can i open/edit and save xml file using php for next example: <?xml version="1.0" encoding="ISO-8859-1"?> <tools> <tool id="1"> <field id="prodName"> <value>HAMMER HG2606</value> </field> <field id="prodNo"> <value>32456240</value> </field> <field id="price"> <value>$30.00</value> </field> </tool> <tool id="2"> <field id="prodName"> <value>Audi</value> </field> <field id="prodNo"> <value>88885</value> </field> <field id="price"> <value>$26.00</value> </field> </tool> </tools> and do i need <tool id="2"> or just <tool> is enough. Thanks very much on replay, and i don't need another xsl like shown on w3s, just fine is refresh submitted php file after submit (will do something with ajax after). I saw replay from Mr. Writman on questions/377632/add-update-and-edit-an-xml-file-with-php but that is for now 2 complex for me...:) is there any simpler answer (solution). Thanks in advance!!!

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• How to assign fine grained permission on shared mailboxes?

  - by sudhirc

  Typically you can assign either Full and Sendas permissions to mailboxes using Powershell. In our organization we have a need to assign other fine grained permissions like editor, reader , author to the shared mailboxes. We are using a third party tool to achieve this. I am pretty happy with the tool except for that fact that it is a GUI only tool. I am trying to automate the entire process of shared mailbox creation by using a combination of embedded powershell in C# program. All other steps are easy to automate but because this tool is GUI only, I am really struck. Is there an API method available to to achieve this? I guess EWS API can provide some answer but I really do not know where to start.

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• What exception type to throw for unrecognized ID paramater?

  - by fearofawhackplanet

  ITool GetTool(Guid tool) { if (tool = Hammer.Id) return new Hammer(); else if (tool = Drill.Id) return new Drill(); else throw new ....? } What's the most appropriate exception type to throw here? NotSupportedException is the closest I've found but I don't think that's quite right.

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