Angular 10 + Spring JPA + MySQL example

Angular 10 + Spring JPA + MySQL example | Angular 10 Http Client – Spring Boot RestApi Server

In this tutorial, grokonez shows you Angular 10 Http Client & Spring Boot Server example that uses Spring JPA to interact with MySQL and Angular 10 as a front-end technology to make request and receive response.

Related Posts:
How to use Spring JPA MySQL | Spring Boot
How to use Angular Http Client to fetch Data from SpringBoot RestAPI – Angular 10
How to use Angular HttpClient to POST, PUT, DELETE data on SpringBoot Rest APIs – Angular 10

Updated:
– Angular 6: Spring Boot + Angular 6 example | Spring Data JPA + REST + MySQL CRUD example
– Angular 8: Spring Boot 2.1 + Angular 8 + MySQL example | Angular HTTP Client + RestAPIs + Spring JPA CRUD + MySQL tutorial

I. Technologies

– Java 1.8
– Maven 3.3.9
– Spring Tool Suite – Version 3.8.4.RELEASE
– Spring Boot: RELEASE
– Angular 10

II. Overview

angular-http-service-architecture

1. Spring Boot Server

angular-4-spring-jpa-mysql-spring-boot-architecture

For more details about Spring JPA – MySQL, please visit:
How to use Spring JPA MySQL | Spring Boot

2. Angular 10 Client

angular-4-spring-jpa-postgresql-angular-architecture

For more details:
– About Angular 10 Routing:
How to work with Angular Routing – Spring Boot + Angular 10
– About Angular Http Client to GET/POST/DELETE:
+ How to use Angular Http Client to fetch Data from SpringBoot RestAPI – Angular 10
+ How to use Angular HttpClient to POST, PUT, DELETE data on SpringBoot Rest APIs – Angular 10

III. Practice

1. Project Structure

1.1 Spring Boot Server

angular-4-spring-jpa-mysql-spring-boot-structure

– Class Customer corresponds to entity and table customer, it should be implemented Serializable.
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: getAll, postCustomer, delete, findByLastName.
– Configuration for Spring Datasource and Spring JPA properties in application.properties
Dependencies for Spring Boot and MySQL in pom.xml

1.2 Angular 10 Client

angular-4-spring-jpa-postgresql-angular-structure

In this example, we focus on:
– 4 components: customers, customer-details, create-customer, search-customer.
– 3 modules: FormsModule, HttpModule, AppRoutingModule.
customer.ts: class Customer (id, firstName, lastName)
data.service.ts: DataService for Http Client methods
proxy.conf.json for integrating Angular Client with Spring Boot Server.

2. How to do

2.1 Spring Boot Server

2.1.1 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>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<scope>runtime</scope>
</dependency>
2.1.2 Customer – Data Model

package com.javasampleapproach.jpamysqlangular4.model;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "customer")
public class Customer implements Serializable {

	private static final long serialVersionUID = -3009157732242241606L;
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private long id;

	@Column(name = "firstname")
	private String firstName;

	@Column(name = "lastname")
	private String lastName;

	protected Customer() {
	}

	public long getId() {
		return id;
	}

	public void setId(long id) {
		this.id = id;
	}

	public String getFirstName() {
		return firstName;
	}

	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}

	public String getLastName() {
		return lastName;
	}

	public void setLastName(String lastName) {
		this.lastName = lastName;
	}

	public Customer(String firstName, String lastName) {
		this.firstName = firstName;
		this.lastName = lastName;
	}

	@Override
	public String toString() {
		return String.format("Customer[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
	}
}
2.1.3 JPA Repository

package com.javasampleapproach.jpamysqlangular4.repo;

import java.util.List;

import org.springframework.data.repository.CrudRepository;

import com.javasampleapproach.jpamysqlangular4.model.Customer;

public interface CustomerRepository extends CrudRepository {
	List findByLastName(String lastName);
}
2.1.4 REST Controller
package com.javasampleapproach.jpamysqlangular4.controller;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import com.javasampleapproach.jpamysqlangular4.model.Customer;
import com.javasampleapproach.jpamysqlangular4.repo.CustomerRepository;

@RestController
public class CustomerController {

	@Autowired
	CustomerRepository repository;

	@GetMapping(value="/customer",  produces=MediaType.APPLICATION_JSON_VALUE)
	public List getAll() {
		List list = new ArrayList<>();
		Iterable customers = repository.findAll();

		customers.forEach(list::add);
		return list;
	}
	
	@PostMapping(value="/postcustomer")
	public Customer postCustomer(@RequestBody Customer customer) {

		repository.save(new Customer(customer.getFirstName(), customer.getLastName()));
		return customer;
	}

	@GetMapping(value="/findbylastname/{lastName}",  produces=MediaType.APPLICATION_JSON_VALUE)
	public List findByLastName(@PathVariable String lastName) {

		List customers = repository.findByLastName(lastName);
		return customers;
	}
	
	@DeleteMapping(value="/customer/{id}")
	public void deleteCustomer(@PathVariable long id){
		
		repository.delete(id);
	}
}
2.1.5 Configuration for Spring Datasource & JPA properties

spring.datasource.url=jdbc:mysql://localhost:3306/testdb?useSSL=false
spring.datasource.username=root
spring.datasource.password=123456
spring.jpa.generate-ddl=true

2.2 Angular 10 Client

2.2.0 Model

export class Customer {
    public id: number;
    public firstName: string;
    public lastName: string;
}
2.2.1 DataService

import { Injectable } from '@angular/core';
import { Headers, Http } from '@angular/http';

import 'rxjs/add/operator/toPromise';

import { Customer } from './customer';

@Injectable()
export class DataService {

  private customersUrl = 'customer';  // URL to web API
  private headers = new Headers({'Content-Type': 'application/json'});

  constructor(private http: Http) {}

  // Get all customers
  getCustomers(): Promise {
    return this.http.get(this.customersUrl)
      .toPromise()
      .then(response => response.json() as Customer[])
      .catch(this.handleError);
  }

  getCustomersByLastName(lastName: string): Promise {
    const url = `findbylastname/${lastName}`;
    return this.http.get(url)
      .toPromise()
      .then(response => response.json() as Customer)
      .catch(this.handleError);
  }

  create(customer: Customer): Promise {
    return this.http
      .post("postcustomer", JSON.stringify(customer), {headers : this.headers})
      .toPromise()
      .then(res => res.json() as Customer)
      .catch(this.handleError);
  }

  delete(id: number): Promise {
    const url = `${this.customersUrl}/${id}`;
    return this.http.delete(url, {headers: this.headers})
      .toPromise()
      .then(() => null)
      .catch(this.handleError);
  }

  private handleError(error: any): Promise {
    console.error('Error', error); // for demo purposes only
    return Promise.reject(error.message || error);
  }
}
2.2.2 Components

- CustomersComponent:


import { Component, OnInit } from '@angular/core';
import { Customer } from '../customer';
import { DataService } from '../data.service';

@Component({
  selector: 'customers-list',
  templateUrl: './customers.component.html',
  styleUrls: ['./customers.component.css'],
})

export class CustomersComponent implements OnInit {
  customers: Customer[];
  selectedCustomer: Customer;

  constructor(private dataService: DataService) {}

  getCustomers() {
     this.dataService.getCustomers().then(customers => this.customers = customers);
  }

  ngOnInit(): void {
     this.getCustomers();
  }

  onSelect(cust: Customer): void {
    this.selectedCustomer = cust;
  }
}
<ul>
    <li *ngFor="let cust of customers"
		[class.selected]="cust === selectedCustomer" (click)="onSelect(cust)">
		<h4>{{cust.id}} - {{cust.firstName}} {{cust.lastName}}</h4> 
	</li>
</ul>
<customer-detail [customer]="selectedCustomer"></customer-detail>

- CustomerDetailsComponent:


import { Component, Input } from '@angular/core';

import { Customer } from '../customer';
import { DataService } from '../data.service';

@Component({
  selector: 'customer-detail',
  templateUrl: './customer-details.component.html',
  styleUrls: ['./customer-details.component.css'],
  providers: [DataService]
})

export class CustomerDetailsComponent {

  @Input() customer: Customer;

  constructor(private dataService: DataService) {}

  delete(): void {
    this.dataService.delete(this.customer.id).then(() => this.goBack());
  }

  goBack(): void {
    window.location.replace('');
  }
}
<div *ngIf="customer">
	<h2>{{customer.firstName}} details:</h2>
	<div>
		<label>id: </label> {{customer.id}}
	</div>
	<div>
		<label>First Name: </label> {{customer.firstName}}
	</div>
	<div>
		<label>Last Name: </label> {{customer.lastName}}
	</div>
	
	<button class="btn btn-danger" (click)="delete()">Delete</button>
</div>

- CreateCustomerComponent:


import {Customer} from '../customer';
import {DataService} from '../data.service';
import {Component, OnInit} from '@angular/core';
import {Location} from '@angular/common';

@Component({
  selector: 'app-create-customer',
  templateUrl: './create-customer.component.html',
  styleUrls: ['./create-customer.component.css']
})

export class CreateCustomerComponent implements OnInit {
  customer = new Customer;
  submitted = false;
  constructor(private dataService: DataService,
    private location: Location) {}

  ngOnInit() {
  }

  newCustomer(): void {
    this.submitted = false;
    this.customer = new Customer();
  }

  private save(): void {
    this.dataService.create(this.customer);
  }

  onSubmit() {
    this.submitted = true;
    this.save();
  }

  goBack(): void {
    this.location.back();
  }
}
<h3>Create Customer Form</h3>
<div [hidden]="submitted" style="width: 300px;">
	<form (ngSubmit)="onSubmit()">
		<div class="form-group">
			<label for="firstname">First Name</label> <input type="text"
				class="form-control" id="firstname" required
				[(ngModel)]="customer.firstName" name="firstname">
		</div>

		<div class="form-group">
			<label for="lastname">Last Name</label> <input type="text"
				class="form-control" id="lastname" required
				[(ngModel)]="customer.lastName" name="lastname">
		</div>

		<div class="btn-group">
			<button class="btn btn-primary" (click)="goBack()">Back</button>
			<button type="submit" class="btn btn-success">Submit</button>
		</div>
	</form>
</div>

<div [hidden]="!submitted">
	<div class="btn-group ">
		<h4>You submitted successfully!</h4>
		<button class="btn btn-primary" (click)="goBack()">Back</button>
		<button class="btn btn-success" (click)="newCustomer()">Add</button>
	</div>
</div>

- SearchCustomersComponent:


import {Component, OnInit} from '@angular/core';
import {Customer} from '../customer';
import {DataService} from '../data.service';

@Component({
  selector: 'app-search-customers',
  templateUrl: './search-customers.component.html',
  styleUrls: ['./search-customers.component.css']
})

export class SearchCustomersComponent implements OnInit {
  lastName: string;
  customers: Customer[];
  
  constructor(private dataService: DataService) {}

  ngOnInit() {
    this.lastName = "";
  }

  private searchCustomers() {
    this.dataService.getCustomersByLastName(this.lastName).then(customers => this.customers = customers);
  }

  onSubmit() {
    this.searchCustomers();
  }

}
<h3>Find By Last Name</h3>
<div style="width: 300px;">
	<form (ngSubmit)="onSubmit()">
		<div class="form-group">
			<label for="lastname">Last Name</label> <input type="text"
				class="form-control" id="lastname" required [(ngModel)]="lastName"
				name="lastname">
		</div>

		<div class="btn-group">
			<button type="submit" class="btn btn-success">Submit</button>
		</div>
	</form>
</div>
<ul>
	<li *ngFor="let cust of customers">
		<h4>{{cust.id}} - {{cust.firstName}} {{cust.lastName}}</h4>
	</li>
</ul>
2.2.3 AppRoutingModule

import {CreateCustomerComponent} from './create-customer/create-customer.component';
import {CustomersComponent} from './customers/customers.component';
import {SearchCustomersComponent} from './search-customers/search-customers.component';

import {NgModule} from '@angular/core';
import {RouterModule, Routes} from '@angular/router';

const routes: Routes = [
  {path: '', redirectTo: 'customer', pathMatch: 'full'},
  {path: 'customer', component: CustomersComponent},
  {path: 'add', component: CreateCustomerComponent},
  {path: 'findbylastname', component: SearchCustomersComponent},
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})

export class AppRoutingModule {}

And AppComponent HTML for routing:

<div style="padding: 20px;">
	<h2 style="color: blue">JSA - Angular Application!</h2>
	<nav>
		<a routerLink="customer" class="btn btn-primary active" role="button" routerLinkActive="active">Customers</a>
		<a routerLink="add"	class="btn btn-primary active" role="button" routerLinkActive="active">Add</a>
		<a routerLink="findbylastname"	class="btn btn-primary active" role="button" routerLinkActive="active">Search</a>
	</nav>
	<router-outlet></router-outlet>
</div>
2.2.4 AppModule

import {AppRoutingModule} from './app-routing.module';
import {BrowserModule} from '@angular/platform-browser';
import {NgModule} from '@angular/core';
import {FormsModule} from '@angular/forms';
import {HttpModule} from '@angular/http';

import {AppComponent} from './app.component';
import {CustomerDetailsComponent} from './customer-details/customer-details.component';
import {CustomersComponent} from './customers/customers.component';
import {DataService} from './data.service';
import {CreateCustomerComponent} from './create-customer/create-customer.component';

import {enableProdMode} from '@angular/core';
import {SearchCustomersComponent} from './search-customers/search-customers.component';

@NgModule({
  declarations: [
    AppComponent,
    CustomerDetailsComponent,
    CustomersComponent,
    CreateCustomerComponent,
    SearchCustomersComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    AppRoutingModule
  ],
  providers: [DataService],
  bootstrap: [AppComponent]
})

export class AppModule {}
2.2.5 Integrate Angular Client with Spring Boot Server

- Add proxy.conf.json to root folder of the project:


{
    "/": {
        "target": "http://localhost:8080",
        "secure": false
    }
}

– Edit package.json file for “start” script:


...
"scripts": {
    "ng": "ng",
    "start": "ng serve --proxy-config proxy.conf.json",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
},
...

3. Run & Check Result

- Build and Run Spring Boot project with commandlines: mvn clean install and mvn spring-boot:run.
- Run the Angular App with command: npm start.

- Open browser for url http://localhost:4200/:
Add Customer:
angular-4-spring-jpa-postgresql-result-add-customer

Show Customers & click on any Customer:
angular-4-spring-jpa-mysql-result-show-customers

>> MySQL DB:
angular-4-spring-jpa-mysql-result-mysql-db

Search Customer:
angular-4-spring-jpa-mysql-result-search-customers

Go back to ShowCustomers, chose a Customer and click on Delete Customer:
angular-4-spring-jpa-mysql-result-delete-customer

>> MySQL DB after deleting:
angular-4-spring-jpa-mysql-result-mysql-db-after-delete

IV. Source Code

SpringJPAMySQLAngular4
Angular4Client



By grokonez | March 27, 2021.


Related Posts


Got Something To Say:

Your email address will not be published. Required fields are marked *

*