Hypertechblog

Make admin panel with Active admin rails || active_admin rails  Open Terminal and copy and paste this Command rails new admin_example // creating new rails application go inside the project cd admin_example run bundle install bundle install open your gem file and add this new gem's gem 'activeadmin' / / for active admin panel gem 'inherited_resources' //  making your controllers inherit all restful actions gem 'devise' // for user authentication  run bundle install again bundle install install active admin rails g active_admin:install / /install active admin to your project migrate database rake db:migrate check your seed file and run rake db:seed create user file and model rails g User name email  create post file and model rails g Post title body:text published_at:datetime user:references Now Migrate DataBase rake db:migrate start rails server rails s Hit url localhost:3000/admin/login Enter login details you can find login

Structured query language It is a collection of pre defined commands and constructs with syntactical rules. 1. Sql is a client tool to interact with ORACLE DB /any DB 2. Sql is to be installed in to the system whenever we have installed the db software. 3. Client [Technical] requests should be submitted in the form of "Queries". 4. Queries are executed by SQL STMT EXECUTOR ( Oracle Db Engine ) 5. Queries are executed against database and output will be displayed on the Sql * plus window.

First install node and check node -v and npm -v Create a directory mkdir <your_directory_name> Run command npm init (press enter and use all defaults) by this command package.json file will be created in root directory for creating Dependency we run this command npm install --save-dev babel-cli babel-preset-react npm install --save-dev babel-cli babel-preset-env sudo npm install -g  babel-cli babel-preset-env babel-preset-react ( Installed "babel-cli@6.26.0" with binaries:  - babel-doctor  - babel - babel-node  - babel-external-helpers ) this packages are created. Install live server npm  install  -g  live - server Now again make a directory inside root directory mkdir public (you can take name as you want) mkdir src (you can take name what ever you want you want) inside public folder create two new file index.html index.js inside src folder create one new file  main.js ( this is file where react app execution is start. you can take

public static void main( String []args ). This string args is used to taking input from console,when we access the file and give some input value. suppose our filename is ABC.java And the className, which has Main method is ABC. To compile this we Run command- javac ABC.java After the compilation this will generate class code that is- ABC.class When we run this using- java ABC “ if here we pass some value this value will go to the args ”. so thats why we use it.

Error 404 is generate when, Database connection is failed. Incorrect query parameters. Incorrect dB name. Mismatch swapping between webpages.