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‎springboot-jpa-hibernate-onetomany-mapping/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.1.1.RELEASE</version>
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<relativePath /> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.example</groupId>
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<artifactId>springboot-jpa-hibernate-onetomany-mapping</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>springboot-jpa-hibernate-onetomany-mapping</name>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-jpa</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>com.h2database</groupId>
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<artifactId>h2</artifactId>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎springboot-jpa-hibernate-onetomany-mapping/src/main/java/com/example/demo/SpringbootJpaHibernateOnetoonemappingApplication.java

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package com.example.demo;
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import java.util.HashSet;
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import java.util.Set;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.CommandLineRunner;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import com.example.demo.model.Employee;
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import com.example.demo.model.EmployeeContact;
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import com.example.demo.repository.EmployeeRepository;
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@SpringBootApplication
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public class SpringbootJpaHibernateOnetoonemappingApplication implements CommandLineRunner {
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@Autowired
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EmployeeRepository employeeRepository;
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public static void main(String[] args) {
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SpringApplication.run(SpringbootJpaHibernateOnetoonemappingApplication.class, args);
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}
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@Override
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public void run(String... args) throws Exception {
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Employee employee = new Employee();
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employee.setName("sibin");
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employee.setSalary(12500);
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EmployeeContact contact1 = new EmployeeContact();
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contact1.setPhoneNo(111111111111l);
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EmployeeContact contact2 = new EmployeeContact();
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contact2.setPhoneNo(22222222222222l);
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Set<EmployeeContact> contacts = new HashSet<>();
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contacts.add(contact1);
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contacts.add(contact2);
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employee.setEmployeeContacts(contacts);
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employeeRepository.save(employee);
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}
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}

‎springboot-jpa-hibernate-onetomany-mapping/src/main/java/com/example/demo/controller/HomeController.java

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package com.example.demo.controller;
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import java.util.List;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.DeleteMapping;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PathVariable;
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import org.springframework.web.bind.annotation.PostMapping;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import com.example.demo.model.Employee;
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import com.example.demo.repository.EmployeeRepository;
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@RestController
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@RequestMapping("employee")
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public class HomeController {
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@Autowired
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EmployeeRepository employeeRepository;
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@GetMapping
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public List<Employee> findAll() {
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return employeeRepository.findAll();
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}
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@PostMapping
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public Employee saveEmployee(@RequestBody Employee employee) {
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return employeeRepository.save(employee);
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}
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@GetMapping("/{employeeName}")
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public List<Employee> findByName(@PathVariable("employeeName") String employeeName) {
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return employeeRepository.findByName(employeeName);
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}
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@DeleteMapping("/{id}")
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public String deleteEmployee(@PathVariable("id") Integer id) {
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try {
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employeeRepository.deleteById(id);
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return "Deleted successfully";
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} catch (Exception e) {
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return "Failed to delete";
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}
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}
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}

‎springboot-jpa-hibernate-onetomany-mapping/src/main/java/com/example/demo/model/Employee.java

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package com.example.demo.model;
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import java.util.Set;
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import javax.persistence.CascadeType;
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import javax.persistence.Column;
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import javax.persistence.Entity;
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import javax.persistence.FetchType;
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import javax.persistence.GeneratedValue;
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import javax.persistence.GenerationType;
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import javax.persistence.Id;
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import javax.persistence.JoinColumn;
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import javax.persistence.OneToMany;
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import javax.persistence.Table;
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@Entity
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@Table(name = "employee")
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public class Employee {
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@Id
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@GeneratedValue(strategy = GenerationType.AUTO)
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@Column(name = "id", unique = true, nullable = false)
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private Integer id;
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@Column(name = "name")
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private String name;
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private Integer salary;
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@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
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@JoinColumn(name = "empId")
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private Set<EmployeeContact> employeeContacts;
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public Set<EmployeeContact> getEmployeeContacts() {
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return employeeContacts;
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}
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public void setEmployeeContacts(Set<EmployeeContact> employeeContacts) {
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this.employeeContacts = employeeContacts;
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}
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public Employee() {
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}
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public Integer getId() {
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return id;
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}
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public Employee setId(Integer id) {
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this.id = id;
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return this;
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}
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public String getName() {
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return name;
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}
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public Employee setName(String name) {
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this.name = name;
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return this;
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}
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public Integer getSalary() {
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return salary;
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}
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public Employee setSalary(Integer salary) {
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this.salary = salary;
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return this;
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}
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@Override
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public String toString() {
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return "Employee [id=" + id + ", name=" + name + ", salary=" + salary + ", employeeContacts=" + employeeContacts
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+ "]";
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}
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}

‎springboot-jpa-hibernate-onetomany-mapping/src/main/java/com/example/demo/model/EmployeeContact.java

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package com.example.demo.model;
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import javax.persistence.Column;
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import javax.persistence.Entity;
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import javax.persistence.GeneratedValue;
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import javax.persistence.GenerationType;
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import javax.persistence.Id;
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import javax.persistence.Table;
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@Entity
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@Table(name = "employee_contact")
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public class EmployeeContact {
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@Id
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@GeneratedValue(strategy = GenerationType.AUTO)
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@Column(name = "id")
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private Integer id;
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private Long phoneNo;
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public EmployeeContact() {
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}
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public Integer getId() {
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return id;
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}
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public EmployeeContact setId(Integer id) {
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this.id = id;
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return this;
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}
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public Long getPhoneNo() {
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return phoneNo;
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}
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public void setPhoneNo(Long phoneNo) {
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this.phoneNo = phoneNo;
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}
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@Override
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public String toString() {
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return "EmployeeContact [id=" + id + ", phoneNo=" + phoneNo + "]";
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}
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}

‎springboot-jpa-hibernate-onetomany-mapping/src/main/java/com/example/demo/repository/EmployeeRepository.java

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package com.example.demo.repository;
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import java.util.List;
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import org.springframework.data.jpa.repository.JpaRepository;
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import org.springframework.stereotype.Repository;
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import com.example.demo.model.Employee;
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@Repository
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public interface EmployeeRepository extends JpaRepository<Employee, Integer> {
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List<Employee> findByName(String name);
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}

‎springboot-jpa-hibernate-onetomany-mapping/src/main/resources/application.properties

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spring.datasource.url=jdbc:h2:mem:knfdb
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spring.datasource.driverClassName=org.h2.Driver
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spring.datasource.username=sa
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spring.datasource.password=password
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spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
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logging.level.org.hibernate.SQL=DEBUG
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logging.level.org.hibernate.type=TRACE
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spring.h2.console.enabled=true

‎springboot-jpa-hibernate-onetomany-mapping/src/test/java/com/example/demo/SpringbootJpaHibernateOnetoonemappingApplicationTests.java

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/*
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* package com.example.demo;
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*
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* import org.junit.jupiter.api.Test; import
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* org.springframework.boot.test.context.SpringBootTest;
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*
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* @SpringBootTest class SpringbootJpaHibernateOnetoonemappingApplicationTests {
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*
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* @Test void contextLoads() { }
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*
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* }
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*/

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