https://grokonez.com/spring-framework/spring-boot/kotlin-spring-boot/kotlin-spring-boot-angular-6-crud-postgresql-example-spring-data-jpa-rest-apis-example

Kotlin Spring Boot + Angular 6 CRUD + PostgreSQL example | Spring Data JPA + REST APIs example

In this tutorial, we show you Angular 6 Http Client & Spring Boot Server example that uses Spring JPA to do CRUD with PostgreSQL and Angular 6 as a front-end technology to make request and receive response.

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• How to use Spring JPA with PostgreSQL | Spring Boot
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• Kotlin Spring JPA + Postgresql | Spring Boot Example
• Kotlin RequestMapping RESTful APIs with @GetMapping, @PostMapping, @PutMapping, @DeleteMapping
• Kotlin SpringJPA Hibernate One-To-Many relationship

Related Pages:

• Kotlin
• Angular
• SpringBoot

I. Technologies

– Java 1.8
– Maven 3.3.9
– Spring Tool Suite – Version 3.8.4.RELEASE
– Spring Boot: 2.0.3.RELEASE
– Angular 6

• RxJS 6

  II. Overview

  

  1. Spring Boot Server

  

  2. Angular 6 Client

  

  III. Practice

  1. Project Structure

  1.1 Spring Boot Server

  

• Customer class corresponds to entity and table customer.

• CustomerRepository is an interface extends CrudRepository, will be autowired in CustomerController for implementing repository methods and custom finder methods.

• CustomerController is a REST Controller which has request mapping methods for RESTful requests such as: getAllCustomers, postCustomer, deleteCustomer, deleteAllCustomers, findByAge, updateCustomer.

• Configuration for Spring Datasource and Spring JPA properties in application.properties

• Dependencies for Spring Boot and PostgreSQL in pom.xml

  1.2 Angular 6 Client

  

In this example, we focus on:

• 4 components: customers-list, customer-details, create-customer, search-customer.
• 3 modules: FormsModule, HttpClientModule, AppRoutingModule.
• customer.ts: class Customer (id, firstName, lastName)
• customer.service.ts: Service for Http Client methods

  2. How to do

  2.1 Kotlin Spring Boot Server

  2.1.1 Dependency

  <dependency>
  <groupId>org.jetbrains.kotlin</groupId>
  <artifactId>kotlin-stdlib-jdk8</artifactId>
  </dependency>
  <dependency>
  <groupId>org.jetbrains.kotlin</groupId>
  <artifactId>kotlin-reflect</artifactId>
  </dependency>
  <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-jpa</artifactId>
  </dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>

2.1.2 Customer - Data Model

model/Customer.java

https://grokonez.com/spring-framework/spring-boot/kotlin-spring-boot/kotlin-spring-boot-angular-6-crud-postgresql-example-spring-data-jpa-rest-apis-example

Kotlin Spring Boot + Angular 6 CRUD + PostgreSQL example | Spring Data JPA + REST APIs example