reading-notes

Spring RESTful Routing & Static Files

Spring RequestMapping

• @RequestMapping is one of the most common annotation used in Spring Web applications. This annotation maps HTTP requests to handler methods of MVC and REST controllers.

• The @RequestMapping annotation can be applied to class-level and/or method-level in a controller.

• You can have multiple request mappings for a method. For that add one @RequestMapping annotation with a list of values.

There are many applications to use RequestMapping

form more example visit this site resources

Accessing Data with JPA

• JPA is a specification. It is a collection of classes and methods to persistently store the vast amounts of data into a database.

• JPA is an abbreviation that stands for Java Persistence API. It’s a specification which is part of Java EE and defines an API for object-relational mappings and for managing persistent objects.

There are many applications to JPA

form more example visit this site resources

Baeldung: Comparing repositories

there is different kinds of Spring Data repository interfaces and their functionality :

1. CrudRepository : provides CRUD functions
2. PagingAndSortingRepository : provides methods to do pagination and sort records
3. JpaRepository : It contains the full API of CrudRepository and PagingAndSortingRepository ,So it contains API for basic CRUD operations and also API for pagination and sorting

CrudRepository

the typical CRUD functionality is :

1. save
2. findOne
3. findAll
4. count
5. delete
6. exists

JpaRepository

the typical CRUD functionality is :

1. findAll()
2. save
3. flush
4. saveAndFlush
5. deleteInBatch

PagingAndSortingRepository

When using Pageable, we create a Pageable object with certain properties and we’ve to specify at least:

1. Page size
2. Current page number
3. Sorting

form more information visit this site resources