Tutorial by Examples: dh

byte incoming; String inBuffer; void setup() { Serial.begin(9600); // or whatever baud rate you would like } void loop(){ // setup as non-blocking code if(Serial.available() > 0) { incoming = Serial.read(); if(incoming == '\n') { // newline, car...

Sometimes a query looks like this, with a * in the SELECT clause. SELECT item.*, /* nonstandard */ COUNT(*) number_of_uses FROM item JOIN uses ON item.item_id, uses.item_id GROUP BY item.item_id Such a query needs to be refactored to comply with the ONLY_FULL_GROUP_BY sta...

Result<T, E> is an enum type which has two variants: Ok(T) indicating successful execution with meaningful result of type T, and Err(E) indicating occurrence of an unexpected error during execution, described by a value of type E. enum DateError { InvalidDay, InvalidMonth, } str...

By default, floating point operations on float and double do not strictly adhere to the rules of the IEEE 754 specification. An expression is allowed to use implementation-specific extensions to the range of these values; essentially allowing them to be more accurate than required. strictfp disable...

Query to search last executed sp's in db SELECT execquery.last_execution_time AS [Date Time], execsql.text AS [Script] FROM sys.dm_exec_query_stats AS execquery CROSS APPLY sys.dm_exec_sql_text(execquery.sql_handle) AS execsql ORDER BY execquery.last_execution_time DESC Query to search thro...

Hadoop is an open-source software framework for storage and large-scale processing of data-sets in a distributed computing environment. It is sponsored by Apache Software Foundation. It is designed to scale up from single servers to thousands of machines, each offering local comput...

SSL Certificates use something called public key cryptography.We need to use Https instead of Http because of keeping data secure between servers and improving customer trust. To enable this option in grails, we have to run our app differently. The command below: grails run-app -https

Html.TextBox() @Html.TextBox("Name", null, new { @class = "form-control" }) output:<input class="form-control" id="Name"name="Name"type="text"value=""/> @Html.TextBox("Name", "Stack Overflow", new { ...

<# .SYNOPSIS Gets the content of an INI file. .DESCRIPTION Gets the content of an INI file and returns it as a hashtable. .INPUTS System.String .OUTPUTS System.Collections.Hashtable .PARAMETER FilePath Specifies the path to the input INI file. .EXAMPLE ...

<# .SYNOPSIS Reads a CSV file and filters it. .DESCRIPTION The ReadUsersCsv.ps1 script reads a CSV file and filters it on the 'UserName' column. .PARAMETER Path Specifies the path of the CSV input file. .INPUTS None. You cannot pipe objects to ReadUsersCsv.ps1. ...

Reagent is an interface between ClojureScript and react. It allows you to define efficient React components using nothing but plain ClojureScript functions and data, that describe your UI using a Hiccup-like syntax. Example:- (defn sample-component [] [:div [:p "I am a component!"...

Hot Module Replacement allows to add, change or delete app module when application is running. Page reloading is not needed in this case. Prerequisites In addition to webpack-dev-middleware packages: npm install --save-dev webpack-hot-middleware Configuration Simply update configuration of UseW...

First, why do we need lxml ? lxml.etree is a generic API for XML and HTML handling. It aims for ElementTree compatibility and supports the entire XML infoset. It is well suited for both mixed content and data centric XML. Its generality makes it the best choice for most applications. The lxml libr...

The idea behind the AdhocWorkspace is to create a workspace on the fly. var workspace = new AdhocWorkspace(); string projectName = "HelloWorldProject"; ProjectId projectId = ProjectId.CreateNewId(); VersionStamp versionStamp = VersionStamp.Create(); ProjectInfo helloWorldProject = P...

The first standalone R script Standalone R scripts are not executed by the program R (R.exe under Windows), but by a program called Rscript (Rscript.exe), which is included in your R installation by default. To hint at this fact, standalone R scripts start with a special line called Shebang line, ...

Solves problem of: access denied for user root using password YES Stop mySQL: sudo systemctl stop mysql Restart mySQL, skipping grant tables: sudo mysqld_safe --skip-grant-tables Login: mysql -u root In SQL shell, look if users exist: select User, password,plugin FROM mysql.user ; U...

Both are used to define error handling for a website, but different software refers to different config elements. customErrors are a legacy (backwards compatable) element, used by Visual Studio Development Server (aka. VSDS or Cassini). httpErrors are the new element which is only used by IIS7. T...

When you want the current date and time, you can do this with the Javascript function Date, but will return the following format which isn't always useful: Wed Jun 07 2017 13:26:15 GMT+0200 (Romance (zomertijd)). Copy the following code into app/helpers/helpers.js, and simply call getCurrentDateAnd...

A search request can be executed purely using a URI by providing request parameters. Not all search options are exposed when executing a search using this mode, but it can be handy for quick "curl tests". GET Index/type/_search?q=field:value Another useful feature provided is highlight...

Key Points:- Is Hash table and Linked list implementation of the Map interface, with predictable iteration order. inherits HashMap class and implements the Map interface. contains values based on the key. only unique elements. may have one null key and multiple null values. ...