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SaurabhjavaSaurabhjava
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OneToManyExamples
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6 files changed

+285
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‎com/Address.java‎

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package com;
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import javax.persistence.Entity;
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import javax.persistence.Id;
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@Entity
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public class Address {
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@Id
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private int addressId;
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private String city;
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private String country;
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private int zip;
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public Address() {
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}
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public Address(int addressId, String city, String country, int zip) {
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super();
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this.addressId = addressId;
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this.city = city;
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this.country = country;
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this.zip = zip;
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}
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public int getAddressId() {
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return addressId;
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}
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public void setAddressId(int addressId) {
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this.addressId = addressId;
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}
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public String getCity() {
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return city;
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}
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public void setCity(String city) {
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this.city = city;
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}
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public String getCountry() {
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return country;
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}
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public void setCountry(String country) {
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this.country = country;
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}
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public int getZip() {
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return zip;
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}
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public void setZip(int zip) {
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this.zip = zip;
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}
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}

‎com/Employee.java‎

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package com;
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import javax.persistence.CascadeType;
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import javax.persistence.Entity;
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import javax.persistence.FetchType;
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import javax.persistence.Id;
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import javax.persistence.JoinColumn;
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import javax.persistence.OneToOne;
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import javax.persistence.Table;
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@Entity
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@Table(name="EmpTable")
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public class Employee {
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@Id
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private int empid;
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private String name;
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private String dept;
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private double salary;
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@OneToOne(fetch=FetchType.LAZY,cascade=CascadeType.ALL)
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@JoinColumn(name="Address_Id",referencedColumnName="addressId")
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private Address address;
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public Employee() {
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}
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public Employee(int empid, String name, String dept, double salary, Address address) {
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super();
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this.empid = empid;
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this.name = name;
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this.dept = dept;
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this.salary = salary;
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this.address = address;
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}
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public int getEmpid() {
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return empid;
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}
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public void setEmpid(int empid) {
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this.empid = empid;
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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 void setName(String name) {
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this.name = name;
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}
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public String getDept() {
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return dept;
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}
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public void setDept(String dept) {
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this.dept = dept;
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}
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public double getSalary() {
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return salary;
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}
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public void setSalary(double salary) {
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this.salary = salary;
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}
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public Address getAddress() {
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return address;
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}
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public void setAddress(Address address) {
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this.address = address;
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}
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}

‎com/EmployeeMain.java‎

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package com;
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import javax.persistence.EntityManager;
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import javax.persistence.EntityManagerFactory;
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import javax.persistence.EntityTransaction;
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import javax.persistence.Persistence;
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public class EmployeeMain {
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public static void main(String[] args) {
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EntityManagerFactory factory=Persistence.createEntityManagerFactory("day3");
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EntityManager em=factory.createEntityManager();
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EntityTransaction tx=em.getTransaction();
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tx.begin();
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Address obj=new Address(102, "Bangalore", "India", 110070);
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Employee emp=new Employee(112, "Saurabh", "Java", 26000, obj);
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//em.persist(obj);
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em.persist(emp);
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System.out.println("Employee Created.....");
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tx.commit();
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tx.begin();
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/*Employee emp=em.find(Employee.class, 111);
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System.out.println("============Employee Details=============");
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System.out.println(emp.getName()+"\t"+emp.getSalary()+"\t"+emp.getDept());
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System.out.println("============Address Details=============");
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System.out.println(emp.getAddress().getAddressId()+"\t"+emp.getAddress().getCity()+"\t"+emp.getAddress().getCountry());
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em.remove(emp);
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tx.commit();
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System.out.println("Employee Deleted...");*/
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}
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}

‎oneToMany/Answer.java‎

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package oneToMany;
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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.JoinColumn;
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import javax.persistence.ManyToOne;
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@Entity
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public class Answer {
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@Id
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@GeneratedValue(strategy=GenerationType.AUTO)
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private int aid;
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private String answer;
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@ManyToOne
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@JoinColumn(name="QID", nullable=false)
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private Question question;
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public Answer() {
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}
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public Answer(String answer, Question question) {
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super();
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this.answer = answer;
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this.question=question;
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}
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public int getAid() {
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return aid;
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}
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public void setAid(int aid) {
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this.aid = aid;
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}
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public String getAnswer() {
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return answer;
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}
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public void setAnswer(String answer) {
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this.answer = answer;
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}
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public Question getQuestion() {
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return question;
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}
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public void setQuestion(Question question) {
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this.question = question;
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}
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}

‎oneToMany/Question.java‎

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package oneToMany;
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import java.util.List;
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import javax.persistence.CascadeType;
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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.OneToMany;
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@Entity
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public class Question {
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@Id
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@GeneratedValue(strategy=GenerationType.AUTO)
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private int qid;
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private String question;
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private String lavel;
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@OneToMany(mappedBy="question",cascade=CascadeType.ALL)
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private List<Answer> answer;
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public Question() {
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}
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public Question(String question, String lavel) {
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super();
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this.question = question;
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this.lavel = lavel;
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}
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public int getQid() {
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return qid;
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}
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public void setQid(int qid) {
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this.qid = qid;
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}
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public String getQuestion() {
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return question;
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}
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public void setQuestion(String question) {
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this.question = question;
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}
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public String getLavel() {
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return lavel;
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}
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public void setLavel(String lavel) {
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this.lavel = lavel;
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}
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public List<Answer> getAnswer() {
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return answer;
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}
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public void setAnswer(List<Answer> answer) {
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this.answer = answer;
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}
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}

‎oneToMany/QuestionMain.java‎

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package oneToMany;
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import java.util.ArrayList;
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import java.util.List;
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import javax.persistence.EntityManager;
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import javax.persistence.EntityManagerFactory;
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import javax.persistence.EntityTransaction;
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import javax.persistence.Persistence;
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public class QuestionMain {
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public static void main(String[] args) {
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EntityManagerFactory factory=Persistence.createEntityManagerFactory("day3");
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EntityManager em=factory.createEntityManager();
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EntityTransaction tx=em.getTransaction();
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tx.begin();
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Question q=new Question("What is Java?", "Low");
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List<Answer> li=new ArrayList<Answer>();
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li.add(new Answer("Java ia OOP.",q));
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li.add(new Answer("Java is Simple",q));
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li.add(new Answer("Java is Multithreaded",q));
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q.setAnswer(li);
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em.persist(q);
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tx.commit();
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System.out.println("=============Done==============");
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}
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}

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