Tutorial by Examples: w

JSON Web Encryption (JWE) represents encrypted content using JavaScript Object Notation (JSON) based data structures. It defines a way to encrypt your claims data so that only intended receiver can read the information present in a token. In the JWE JSON Serialization, a JWE is represented as a JS...

From Section 9 of JSON Web Encryption specification (RFC 7516): The JOSE Header for a JWS can be distinguished from the JOSE Header for a JWE by examining the "alg" (algorithm) Header Parameter value. If the value represents a digital signature or MAC algorithm, or is the value "no...

The WeakSet object is used for storing weakly held objects in a collection. The difference from Set is that you can't store primitive values, like numbers or string. Also, references to the objects in the collection are held weakly, which means that if there is no other reference to an object stored...

Description This is a self-contained running example including/showcasing: minimum dependencies needed, Java Configuration, Bean declaration by annotation and Java Configuration, Dependency Injection by Constructor and by Property, and Pre/Post hooks. Dependencies These dependencies are needed in...

To do this first locate config folder in your root. Then open connections.js Locate // someMysqlServer: { // adapter: 'sails-mysql', // host: 'YOUR_MYSQL_SERVER_HOSTNAME_OR_IP_ADDRESS', // user: 'YOUR_MYSQL_USER', //optional // password: 'YOUR_MYSQL_PASSWORD', //optional /...

A problem: Canvas only remembers pixels, not shapes or images This is an image of a circular beach ball, and of course, you can't drag the ball around the image. It may surprise you that just like an image, if you draw a circle on a Canvas you cannot drag that circle around the canvas. That's be...

The exposition pipe operator, %$%, exposes the column names as R symbols within the left-hand side object to the right-hand side expression. This operator is handy when piping into functions that do not have a data argument (unlike, say, lm) and that don't take a data.frame and column names as arg...

This code adds outwardly increasing shadows to an image to create a "sticker" version of the image. Notes: In addition to being an ImageObject, the "img" argument can also be a Canvas element. This allows you to stickerize your own custom drawings. If you draw text on the Can...

Once shadowing is turned on, every new drawing to the canvas will be shadowed. Turn off further shadowing by setting context.shadowColor to a transparent color. // start shadowing context.shadowColor='black'; ... render some shadowed drawings ... // turn off shadowing. context.shadowColor=...

Warning! Apply shadows sparingly! Applying shadowing is expensive and is multiplicatively expensive if you apply shadowing inside an animation loop. Instead, cache a shadowed version of your image (or other drawing): At the start of your app, create a shadowed version of your image in a secon...

The traditional use of shadowing is to give 2-dimensional drawings the illusion of 3D depth. This example shows the same "button" with and without shadowing var canvas=document.createElement("canvas"); var ctx=canvas.getContext("2d"); document.body.appendChild(can...

Canvas does not have CSS's inner-shadow. Canvas will shadow the outside of a filled shape. Canvas will shadow both inside and outside a stroked shape. But it's easy to create inner-shadows using compositing. Strokes with an inner-shadow To create strokes with an inner-shadow, use destinat...

let's generate a DataFrame first: df = pd.DataFrame(np.arange(10).reshape(5,2), columns=list('ab')) print(df) # Output: # a b # 0 0 1 # 1 2 3 # 2 4 5 # 3 6 7 # 4 8 9 drop rows with indexes: 0 and 4 using drop([...], inplace=True) method: df.drop([0,4], inplace=True) ...

INSERT INTO Invoices [ /* column names may go here */ ] VALUES (123, '1234abc', '2016-08-05 20:18:25.770', 321, 5, '2016-08-04'); Column names are required if the table you are inserting into contains a column with the IDENTITY attribute. INSERT INTO Invoices ([ID], [Num], [DateTime], [Tota...

INSERT INTO [dbo].[Customers] ([CustomerName]) VALUES ('Jerry'), ('Gorge') SELECT * FROM [dbo].[Customers] Results CustomerIDCustomerName10001Jerry10002Gorge

DELETE FROM [dbo].[Customers] WHERE CustomerName = 'Gorge'; INSERT INTO [dbo].[Customers] ([CustomerName]) VALUES ('George') SELECT * FROM [dbo].[Customers] Results CustomerIDCustomerName10001Jerry10003George

SCOPE_IDENTITY() returns the last identity value inserted into an identity column in the same scope. A scope is a module: a stored procedure, trigger, function, or batch. Therefore, two statements are in the same scope if they are in the same stored procedure, function, or batch. INSERT INTO ([col...

CREATE VIEW dbo.PersonsView AS SELECT name, address FROM persons;

This query will drop the view - if it already exists - and create a new one. IF OBJECT_ID('dbo.PersonsView', 'V') IS NOT NULL DROP VIEW dbo.PersonsView GO CREATE VIEW dbo.PersonsView AS SELECT name, address FROM persons;

First, in addition to the normal Fresco Gradle dependency, you have to add the OkHttp 3 dependency to your build.gradle: compile "com.facebook.fresco:imagepipeline-okhttp3:1.2.0" // Or a newer version. When you initialize Fresco (usually in your custom Application implementation), you ...