Tutorial by Examples: ce

A lot of example code posted on StackOverflow includes snippets like this: if ("A".equals(someString)) { // do something } This does "prevent" or "avoid" a possible NullPointerException in the case that someString is null. Furthermore, it is arguable that ...

When you try to restore database from another server you might get the following error: Error 3154: The backup set holds a backup of a database other than the existing database. In that case you should use WITH REPLACE option to replace database with the database from backup: RESTORE DATABAS...

The Same Database reference allows you to split a single database into multiple projects. This is useful for cases where a project is very large or where different teams manage different parts of the database. If you consider that you have two .sqlproj SSDT database projects with the following stru...

Operators that bound tighter (higher precedence) are listed first. OperatorsPrecedence group (≥3.0)PrecedenceAssociativity.∞left?, !, ++, --, [], (), {}(postfix)!, ~, +, -, ++, --(prefix)~> (swift ≤2.3)255left<<, >>BitwiseShiftPrecedence160none*, /, %, &, &*MultiplicationPrec...

This is contrived; but some COBOL programmers may prefer the positive clarity, versus using NOT in conditional expressions (especially with the logic error prone var NOT = value OR other-value). if action-flag = "C" or "R" or "U" or "D" continue else...

This example will create an EC2 instance of t2.micro type in N.Virginia region running Amazon Linux. During the execution, it will ask to select the KeyPair to use and an I.P. CIDR from where you can SSH to the instance, use default to make SSH open to the internet { "AWSTemplateFormatVersion"...

The HTTP response status code 301 Moved Permanently is used for permanent URL redirection, meaning current links or records using the URL that the response is received for should be updated. The new URL should be provided in the Location field included with the response. The 301 redirect is consider...

s/foo/bar/; # replace "foo" with "bar" in $_ my $foo = "foo"; $foo =~ s/foo/bar/; # do the above on a different variable using the binding operator =~ s~ foo ~ bar ~; # using ~ as a delimiter $foo = s/foo/bar/r; # non-destructive r flag: returns the repl...

This example uses the map format introduced in Erlang/OTP 18.0. %% A module implementing a supervisor usually has a name ending with `_sup`. -module(my_sup). -behaviour(supervisor). %% API exports -export([start_link/0]). %% Behaviour exports -export([init/1]). start_link() -> ...

We initialize the data: [X,Y] = meshgrid(1:2:10); Z = X.*cos(Y) - Y.*sin(X); The surface looks like the following. Now we set the points where we want to interpolate: [Vx,Vy] = meshgrid(1:0.25:10); We now can perform nearest interpolation, Vz = interp2(X,Y,Z,Vx,Vy,'nearest'); line...

We will use the following data: x = 1:5:50; y = randi([-10 10],1,10); Hereby x and y are the coordinates of the data points and z are the points we need information about. z = 0:0.25:50; One way to find the y-values of z is piecewise linear interpolation. z_y = interp1(x,y,z,'linear'); ...

The export tool exports a set of files from HDFS back to an RDBMS. The target table must already exist in the database. The input files are read and parsed into a set of records according to the user-specified delimiters. Example : sqoop export \ --connect="jdbc:<databaseconnector>&quo...

Instead of running intensive tasks into JavaFX Thread that should be done into a Service.So what basically is a Service? A Service is a class which is creating a new Thread every time you are starting it and is passing a Task to it to do some work.The Service can return or not a value. Below is ...

Installation Additional dependencies are required for Redis support. Install both Celery and the dependencies in one go using the celery[redis] bundle: $ pip install -U celery[redis] Configuration Configure the location of your Redis database: BROKER_URL = 'redis://localhost:6379/0' The UR...

You shouldn't throw raw values as exceptions, instead use one of the standard exception classes or make your own. Having your own exception class inherited from std::exception is a good way to go about it. Here's a custom exception class which directly inherits from std::exception: #include <ex...

PHP has no support for running code concurrently unless you install extensions such as pthread. This can be sometimes bypassed by using proc_open() and stream_set_blocking() and reading their output asynchronously. If we split code into smaller chunks we can run it as multiple suprocesses. Then usi...

Create a new SSDT project Import 3rd party DB Build project to create a dacpac Reference dacpac in other projects

Introduction Texas Instruments' (TI) CC26XX series SoCs are readily available wireless MCUs targeting Bluetooth Low Energy (BLE) applications. Along with the MCUs, TI offers a full-fledged software stack that provides necessary API and sample codes to help quickly get developers started with the to...

I would venture to say that 80% of the processing that goes on in modern computing systems does not require user interaction, such as kernel code for Linux, OSX and Windows. For those that do, there are two fundamentals which are interactivity via keyboard (pointing devices) and console. This exampl...

SVN FreeBSD project use SVN as default SCM. Source could be download with svnlite software. Get Current cd /usr/src svnlite checkout https://svn.freebsd.org/base/head . Get Releases cd /usr/src svnlite checkout https://web.freebsd.org/base/release/11.0.0 . Tarball (http & ftp) You c...