Form handling is made easy in spring MVC with the help of Spring Tag Library. I have given detailed step-by-step process for form handling. Here, i have taken simple login form as an example.
This video covers following topics.
Introduction to Form Binding.
How to achieve Form Binding Using Spring Tag Libraries.
In the followingVideo lectures, I explained how to Set-Up Basic Spring MVC Application using Spring Boot and also developed small E commerce application.
First Video focuses on setting up Spring MVC project using spring boot. Here, i download sample project from https://start.spring.io/. After downloading, import project contents into your eclipse workspace ( or any other IDE). Imported project is Maven-ised, and you can notice that it includes all dependent jars required for spring. Spring Boot also comes with embedded tomcat server. So, you dont have straight away run web-application as a normal application with out worrying about downloading any other external web server/app container.
For Further details on how to setup, refer below video.
In Second video, I have explained a step by step process for developing online store web-application.
Create a Model, Controller and Views.
Map HTTP URL to Controller using RequestMapping and GetMapping
Display all Products information available in store.
Display Specific Product Information using PathVariable
Taking dynamic variable input from URL
Introducing Service Layer in MVC architecture
Project is still-partial,So Please subscribe for further updates.
Spring is a lightweight framework for developing Java Applications ( standalone, web, enterprise, web Services, micro services). Spring is very popular because its easy to integrate application code with spring framework. With Spring boot 2.0 its even more easier. Spring world provides so many modules such as such as spring core, spring web, spring data access, spring cloud and so many other modules. All of these modules are developed by following basic design pattern i.e Dependency Injection. In the following video i have given detailed description on below concepts.
There are Multiple ways to parse XML in Oracle but in this post i will show how to parse using EXTRACTVALUE and XMLTABLE. Let's Suppose you have an following XML stored in a column MSG in table TMP.
Now if you want to extract <name> value, you will use a function like below.
select
EXTRACTVALUE(XMLTYPE(MSG),'/students/student/name')
from TMP;
Above function takes MSG ( XML source ) in XMLTYPE format.( Since my MSG column is varchar i converted to XMLTYPE ) and returns the value specified in path (XPATH). I have specified absolute path here,you can also specify relative path using //name. See the following video for more detailed explanation on EXTRACVALUE and XMLTABLE
XMLTABLE
EXTRACTVALUE can return only one single value. If you want to render XML as table structure like rows and columns you have to use XMLTABLE. It will create virtual table based on specification. Syntax for XMLTABLE table is as below.
In above query '/students/student' is row specifier XPATH, meaning now of student tags=no of rows. Under each Student element id,name and marks are columns.
Advantage of XMLTABLE is that it can dynamically return all the rows whereas EXTARCTVALUE can only return single row.
Have You Ever Wondered,How to remotely connect to your server ? Most of the time, we will never touch server once it is configured.It's gonna stag in server room. All the necessary actions to ther server like stopping and starting web server,Installing new Packages,Changing host entries all done via remote access.
So,Today in this post we are gonna talk about how to set up remote access using SSH. On a high level,SSH ( Secure SHell) is a standard protocol that allows remote connection.Once SSH service is installed in your linux box, you can access that machine from any location providing a proper authentication.
Installation:
Setting up SSH service is very straight forward. We just have to install a program called openSSH. Its a program that actually implements SSH protocol. Based on your linux distro,you have to type particular command and install the program. Debain / Ubuntu
sudo apt-get install openssh-server
Fedora / RedHat
yum install openssh-server
Start/Stop/Restart/Checking status of SSH service
If you wonder whether your server is already running or if you want start/stop/restart the service use the following command line 1.Know the status
service ssh status
2.Restart the service
service ssh restart
3.Start/Stop service
service ssh stop service ssh start
Configure openSSH
By default service is gonna run with basic configuration.To override default configurations like port number (22), Authentication types, Banner Message etc,You have to change sshd_config file which is located in /etc/ssh
For Detailed description on installation and configuration proceed with this video.
MongoClient() by default creats a connection to server at localhost:27017.If you want to create a connection to remote server then you can specify it as arguments.
$db=$connection->university;
This piece of code selects the database named university.If the database haven't created before,mongodb will automaticaly creates a databse.
$student_collection=$db->student;
same as above line,but this line creats (if first time ) and also selects collection(table in RDMS) named student.you dont have to specify any schema ,mongodb has dynamic schema feature. Finally,create an array with required fields.Insert created array (document) in to collection using insert() function.
Without any doubt, Interview is an important aspect in each and every student life.Thorough preparation is must and should to clear an interview.But the point is how to prepare.? what to prepare..?.Well , Each and Every company has their own method of selection process. Some companies expect you to write complex algorithms whereas some companies concentrate on your basic skills.No mater which company you are attending,these are few concepts you must know (for IT companies).
1. Basic Arithmetic
You should revise your good old school days math problems.Concentrate more on basic skills like percentage,profit and loss, LCM and HCF , Problems on trains , Average ,simple and compound interest ,Logarithms etc. Have a basic knowledge on each and every above mentioned concepts.
Must necessary skill for every company. Don't confuse communicative skills with verbal ability. some people may be good at communication but they may not posses verbal skills. Though its not possible to learn vocabulary with in weeks, you can still give it a try. If you have strong English background and if you are really good at grammar,vocabulary then you concentrate on other sections.
3.Logical Reasoning
Pretty much easy section if you are little bit intelligent. Relationships, Directions, Deductions, Series..etc comes under this section. Key thing in this area is to answer as quickly as possible. Fastness and Accuracy comes with practice.So i suggest you to practice this section as much as you can.
4.Knowledge on Core Concepts
Some companies may add core concepts question as last section. If you are attending IT companies then make sure you have sound knowledge on Pointers, Data Structures ,Data Base, Algorithms. Depth of preparation may depends on company you are attending. Some big companies like flipkart, eBay concentrates more on data structures and algorithms.I suggest you to go through previous papers of respective company before starting preparation.
Tips :
Do not neglect any section.Most of the companies maintain sectional cut-offs which means if you don't qualify in any single section then you wont qualify the written round.
Take Mock online tests and track the performance.Concentrate more on areas you are lagging.
Fastness and Accuracy is the key point rather than just answering.
While writing exam don't just stick to a single question for longer time.If you feel particular question is killing time then better go for next question.
Hey,This is Y.R.R,currently working as a software Engineer at Siemens Software Ltd,India. I like to know "HOW,WHY,WHAT,WHOM" of everything regardless of what medium i am working in. Follow my Youtube Channel YRRHELP to get latest stuff.
