JPAInheritanceDEmo

Author: Saurabhjava

inheritanceMapping/ContractEmployee.java

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+package inheritanceMapping;
+
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+
+@Entity
+//@DiscriminatorValue("Contract")
+public class ContractEmployee extends Emp {
+	
+	private double payPerHour;
+
+	public double getPayPerHour() {
+		return payPerHour;
+	}
+
+	public void setPayPerHour(double payPerHour) {
+		this.payPerHour = payPerHour;
+	}
+	
+
+}

inheritanceMapping/Emp.java

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+package inheritanceMapping;
+
+import java.util.Date;
+
+import javax.persistence.DiscriminatorColumn;
+import javax.persistence.DiscriminatorType;
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.Inheritance;
+import javax.persistence.InheritanceType;
+import javax.persistence.Table;
+import javax.persistence.Temporal;
+import javax.persistence.TemporalType;
+
+@Entity
+@Table(name="EmpDetails")
+//@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
+//@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
+@Inheritance(strategy=InheritanceType.JOINED)
+//@DiscriminatorColumn(name="Employee_Type", discriminatorType=DiscriminatorType.STRING)
+//@DiscriminatorValue("employee")
+public class Emp {
+	@Id
+	@GeneratedValue(strategy=GenerationType.AUTO)
+	private int empid;
+	private String name;
+	@Temporal(TemporalType.DATE)
+	private Date doj;
+	
+	public int getEmpid() {
+		return empid;
+	}
+	public void setEmpid(int empid) {
+		this.empid = empid;
+	}
+	public String getName() {
+		return name;
+	}
+	public void setName(String name) {
+		this.name = name;
+	}
+	public Date getDoj() {
+		return doj;
+	}
+	public void setDoj(Date doj) {
+		this.doj = doj;
+	}
+	
+	
+
+}

inheritanceMapping/EmpMain.java

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+package inheritanceMapping;
+
+import java.util.Date;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.EntityTransaction;
+import javax.persistence.Persistence;
+
+public class EmpMain {
+
+	public static void main(String[] args) {
+		EntityManagerFactory factory=Persistence.createEntityManagerFactory("day3");
+		EntityManager em=factory.createEntityManager();
+		EntityTransaction tx=em.getTransaction();
+		tx.begin();
+		ContractEmployee emp=new ContractEmployee();
+		//PermanentEmployee emp=new PermanentEmployee();
+		emp.setName("Saurabh");
+		emp.setDoj(new Date());
+		//emp.setSalary(34000);
+		emp.setPayPerHour(4000);
+		em.persist(emp);
+		tx.commit();
+		System.out.println("================Done================");
+
+	}
+
+}

inheritanceMapping/PermanentEmployee.java

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+package inheritanceMapping;
+
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+import javax.persistence.Table;
+
+@Entity
+//@DiscriminatorValue("Permanent")
+public class PermanentEmployee extends Emp {
+	private double salary;
+
+	public double getSalary() {
+		return salary;
+	}
+
+	public void setSalary(double salary) {
+		this.salary = salary;
+	}
+	
+	
+}