Tutorial by Examples: ad

Consider a structure of the following classes should be constructed in XAML an then read into a CLR object: namespace CustomXaml { public class Test { public string Value { get; set; } public List<TestChild> Children { get; set; } = new List<TestChild>(); ...

sed -i -e cmd file will modify file even if its permissions are set to read-only. This command behaves similarly to sed -e cmd file > tmp; mv -f tmp file rather than sed -e cmd file > tmp; cat tmp > file; rm tmp The following example uses gnu sed: $ echo 'Extremely important data' &gt...

To create a user dev with password password123 MongoClient mongo = new MongoClient("localhost", 27017); MongoDatabase db = mongo.getDatabase("testDB"); Map<String, Object> commandArguments = new BasicDBObject(); commandArguments.put("createUser", "dev&qu...

The leader key could be used as a way to create a mapping with a key-binding that can be overridden by the end user. The leader is the \ key by default. In order to override it, the end-user would have to execute :let g:mapleader='somekey(s)' before defining the mapping. In a typical scenario, the...

Because of how gerrit relies on change-ids, in order to resolve conflicts (pull changes to your topic branch) the best practice is to rebase topic branch onto master/other branch you want to push to. This way you preserve the change-id without having to ammend the merge commit. For example if you su...

A ThreadPool is an ExecutorService that executes each submitted task using one of possibly several pooled threads, normally configured using Executors factory methods. Here is a basic code to initialize a new ThreadPool as a singleton to use in your app: public final class ThreadPool { priv...

Another good practice to check when our threads have finished without block the thread waiting to recover the Future object from our Callable is to create our own implemetation for Runnables, using it together with the execute() method. In the next example, I show a custom class which implements Ru...

We use ExecutorService to assign threads from the internal thread pool or create them on-demand to perform tasks. Each ExecutorService has an ThreadFactory, but The ExecutorService will use always a default one if we don't set a custom one. Why we should do this? To set a more descriptive thread...

Extract all file contents of a zip file import zipfile with zipfile.ZipFile('zipfile.zip','r') as zfile: zfile.extractall('path') If you want extract single files use extract method, it takes name list and path as input parameter import zipfile f=open('zipfile.zip','rb') zfile=zipfile.Z...

This topic demonstrates how to use functions like withColumn, lead, lag, Level etc using Spark. Spark dataframe is an sql abstract layer on spark core functionalities. This enable user to write SQL on distributed data. Spark SQL supports hetrogenous file formats including JSON, XML, CSV , TSV etc. ...

Prerequisites: Apple Developers Account Setup GameCenter Leaderboards with iTunesConnect Setting up GameCenter Leaderboards: Sign in to iTunesConnect Go to My Apps. Create an app for your project then go to Features. Click on Game Center Click the plus sign next to Leaderboards. Choose...

For one filter: Here is where the query is created, it receives a expression parameter and a filter. private static Expression GetExpression<T>(ParameterExpression param, QueryFilter queryFilter) { // Represents accessing a field or property, so here we are accessing for example: ...

COMPUTE answer = 3*var-1 That is a reference to the variable var-1, and not var - 1. COMPUTE answer = 3 * var - 1 Recommended, opinion.

Scenario: You need to select an implementation of address validation when a sales order is submitted, and the validator is determined by the country to which the order is shipping. The factory needs to inspect some value passed as an argument to select the correct implementation. First, write an in...

This section should list, at least, the out of the box sql functions that come with Teradata Database and also list where there are differences between TD and the ANSI standard.

All we need are: ViewPager, TabLayout and 2 drawables for selected and default dots. Firstly, we have to add TabLayout to our screen layout, and connect it with ViewPager. We can do this in two ways: Nested TabLayout in ViewPager <android.support.v4.view.ViewPager android:id="@+i...

This simple function will execute the specified Select SQL command and return the result as data set. Public Function ReadFromDatabase(ByVal DBConnectionString As String, ByVal SQL As String) As DataTable Dim dtReturn As New DataTable Try 'Open the connection using the connection...

This example uses the Thread Class, but multithreaded applications can also be made using BackgroundWorker. The AddNumber, SubstractNumber, and DivideNumber functions will be executed by separate threads: Edit: Now the UI thread waits for the child threads to finish and shows the result. Module Mo...

int fakeMalloc(__local int * addrCounter,int size) { // lock addrCounter // adds size to addrCounter's pointed cell value // unlock // return old value of addrCounter's pointed cell // serial between all threads visiting -> slow ret...

libraryDependency is the SettingKey that handles 'managed' library dependencies, which are dependencies that are automatically downloaded, matching the supplied versions. To add a single dependency: libraryDependencies += "com.typesafe.slick" %% "slick" % "3.2.0-M1" ...