mermaid.md

graph RL
  database("Database") <-."network"..-> DAO_Implementation
  DAO_Implementation <--> DAOinterface("DAO Interface") 
  DAOinterface <--> service("Servive / service interface") 
  service <--> controller("Controller")
  controller <-."network"..-> client("Client")
  subgraph DAO_Implementation
    dataSource
    entityManager("Entity Manager")
    EntityPOJO
end

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Spring-Based Web Application Structure

1. Database:

   • Represents a Database Management System (DBMS) where the schema is typically defined using SQL.

2. Data Source:

   • Provides configuration details about the database connection, such as URL, username, password, and connection pool configurations.
   • In Spring, the DataSource symbolizes the connection pool.

3. Entity Manager:

   • A module within the Java Spring framework that manages database operations.
   • Uses the data source to establish a connection to the database.

4. Entity POJO:

   • A Plain Old Java Object (POJO) with Java Spring entity annotations for object-to-relation mapping.
   • Helps the Entity Manager convert between Java objects and database records.

5. DAO (Data Access Object):

   • Provides an abstraction for database operations.
   • Typically an implementation of the DAO Interface.

6. DAO Interface:

   • Outlines abstract operations for the DAO.
   • In frameworks like Spring Data JPA, some implementations are automatically generated.

7. Service:

   • An abstraction layer over database functionality.
   • Provides a high-level API for interactions, keeping business logic distinct from data access logic.

8. Controller:

   • Manages incoming HTTP requests in the Spring framework.
   • Invokes appropriate services and returns HTTP responses, often as JSON or rendered HTML views.

9. Client:

   • Represents the end user or system interacting with the web application.