Angular – Step 0

AngularJS to Angular-

– After ‘AngularJS’ (version 1.xx), it was renamed to ‘Angular’ (version 2.xx to current version). Because in Angular we use typescript(ts) instead of javascript (js).  so these statements are true.

1- AngularJS 2.XX does not exist, AngularJS 1.xx does.

2- Angular 1.XX does not exist, Angular 2.XX does.

3TypeScript extends JavaScript with extra functionality or TypeScript is the superset of javaScript. 

Now, let’s see what are differences between Angular vs AngularJS.

[AngularJS]                                                                                [Angular]

1- Javascript (.js files)                                             1- Typescript(.ts files)

2- MVC based                                                           2- Components based

3- <tr ng-repeat=“student in studentsArray”>  3- <tr *ngFor=”let student in studentArray”>

4-<button ng-click=“vm.toggleImage()”>            4- <button (click) ==“vm.toggleImage()”>

5- ng-show, ng-hide                                                 5- [hidden]

6- ng-if                                                                        6- *ngIf

7-ng-model                                                                7- ngModel

AngularJs -Angular Timeline :

1– October 20, 2010 AngularJS
2– 22 September 2014 Angular 2
3– Angular 3 (skipped)
4– 13 December 2016 Angular 4
5– 1 November 2017 Angular 5
6– 3 May 2018 Angular 6
7– October 2018 Angular 7
8– May 2019 Angular 8
9– October/November 2019 Angular 9

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Step 5- Caching in hibernate

  Cache definition- Cache is a temporary data which is used to speed up the performance. Types of caching in hibernate- Caching LevelDefault OnSession-SpecificQuery Results CachedObjects EvictedConcurrent AccessUsageCode SnippetsFirst-level CacheYesYesNoYesThread-safeStoring and retrieving entities within a single session//Loading an entity from the first-level cacheSession session = sessionFactory.openSession();Employee employee = session.get(Employee.class, 1);Second-level CacheNoNoNoConfigurableConfigurabletoring and retrieving entities across multiple…

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Step 4- Mapping in Hibernate

Mapping meaning in hibernate- Connection between java class to database tables Types of mapping in hibernate- 1- Inheritance Mapping- When java classes are having inheritance, their tables can be created using 3 ways- 1- Table per class hierarchy (Single Table Strategy) –Only one table is created for all the classes.-One Discriminator field is used.-xml element <subclass>…

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Step 3- States of objects in hibernate

Hibernate object states- StateDefinitionExampleCode SnippetTransientA transient object is an object that is not associated with a Hibernate session and has no representation in the database.A new instance of an entity class that has not been saved to the database yetPerson p = new Person();PersistentA persistent object is an object that is associated with a Hibernate…

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