Join parent objects with their child entities, for example we want a relational table of each person and their hobbies
DECLARE @json nvarchar(1000) =
N'[
{
"id":1,
"user":{"name":"John"},
"hobbies":[
{...
When you also want to expose metadata without a config file you can build on the example programmatically creating a ServiceHost:
public ConsoleHost()
{
mHost = new ServiceHost(typeof(Example), new Uri("http://localhost:8000/Example"), new Uri("net.tcp://9000/Example"));
...
Scope guards allow executing statements at certain conditions if the current block is left.
import core.stdc.stdlib;
void main() {
int* p = cast(int*)malloc(int.sizeof);
scope(exit) free(p);
}
import std.stdio;
void main()
{
writeln("Hello World!");
}
Multiple imports can either be specified in the same line, separated with a comma or in a new line.
import std.stdio, std.math;
import std.datetime;
void main()
{
writeln("2^4: ", pow(2, 4));
writ...
Selective imports can help to cleanup the namespace and speed-up the compile-time even more, because the compiler only needs to parse the specific, selected functions.
import std.stdio: writeln;
void main()
{
writeln("Hello world");
}
You can also import symbols in any scope, the import will only be looked up when the scope is needed (i.e. compiled) and the imported names will only be exposed in the imported scope. Most commonly the scope for local imports are functions, structs and classes.
void main()
{
import std.stdio:...
Modules have a one-to-one correspondence with source files. The module name is, by default, the file name with the path and extension stripped off, and can be set explicitly with the module declaration.
The ModuleDeclaration sets the name of the module and what package it belongs to. If absent, the...
Suppose, that we have three users :
The Administrator of the database > admin
The application with a full access for her data > read_write
The read only access > read_only
--ACCESS DB
REVOKE CONNECT ON DATABASE nova FROM PUBLIC;
GRANT CONNECT ON DATABASE nova TO user;
With th...
Media queries allow one to apply CSS rules based on the type of device / media (e.g. screen, print or handheld) called media type, additional aspects of the device are described with media features such as the availability of color or viewport dimensions.
General Structure of a Media Query
@media ...
By default, the caret ^ metacharacter matches the position before the first
character in the string.
Given the string "charsequence" applied
against the following patterns: /^char/ & /^sequence/, the engine will try to match as follows:
/^char/
^ - charsequence
c - charsequ...
Proper indentation gives not only the aesthetic look but also increases the readability of the code.
For example, consider the following code:
%no need to understand the code, just give it a look
n = 2;
bf = false;
while n>1
for ii = 1:n
for jj = 1:n
if ii+jj>30
bf = true;
break
end...
Assertions are used not to perform testing of input parameters, but to verify that program flow is corect -- i.e., that you can make certain assumptions about your code at a certain point in time. In other words: a test done with Debug.Assert should always assume that the value tested is true.
Debu...
For multiple quotechars use regex in place of sep:
df = pd.read_csv(log_file,
sep=r'\s(?=(?:[^"]*"[^"]*")*[^"]*$)(?![^\[]*\])',
engine='python',
usecols=[0, 3, 4, 5, 6, 7, 8],
names=['ip', 'time', 'request', 'statu...
var pattern = createPattern(imageObject,repeat)
Creates a reusable pattern (object).
The object can be assigned to any strokeStyle and/or fillStyle.
Then stroke() or fill() will paint the Path with the pattern of the object.
Arguments:
imageObject is an image that will be used as a patter...
context.fill()
Causes the inside of the Path to be filled according to the current context.fillStyle and the filled Path is visually drawn onto the canvas.
Prior to executing context.fill (or context.stroke) the Path exists in memory and is not yet visually drawn on the canvas.
Example code usi...
context.clip
Limits any future drawings to display only inside the current Path.
Example: Clip this image into a triangular Path
<!doctype html>
<html>
<head>
<style>
body{ background-color:white; }
#canvas{border:1px solid red; }
</style>
<sc...
