JPAExamples

LayredArch Demo

Author: Saurabhjava

src/META-INF/persistence.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<persistence xmlns="http://java.sun.com/xml/ns/persistence"
+             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
+                      http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
+  version="2.0">
+	<persistence-unit name="day2" transaction-type="RESOURCE_LOCAL">
+		<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
+		<properties>
+			<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
+			<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/capgemini" />
+			<property name="javax.persistence.jdbc.user" value="root" />
+			<property name="javax.persistence.jdbc.password" value="root" />
+			<property name="hibernate.hbm2ddl.auto" value="update" />
+			<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
+			<property name="hibernate.show_sql" value="true" />
+		</properties>
+	</persistence-unit>
+</persistence>

src/com/capg/config/JPAConfig.java

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+package com.capg.config;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.Persistence;
+
+public class JPAConfig {
+	private static EntityManagerFactory factory;
+	private static EntityManager  em;
+	
+	static {
+		factory=Persistence.createEntityManagerFactory("day2");
+	}
+	
+	public static EntityManager getEntityManager() {
+		if(em==null || !em.isOpen()) {
+			em=factory.createEntityManager();
+		}
+		return em;
+	}
+}

src/com/capg/dao/EmployeeDao.java

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+package com.capg.dao;
+
+import com.capg.pojo.Employee;
+
+public interface EmployeeDao {
+	public String saveEmployee(Employee emp);
+}

src/com/capg/dao/EmployeeDaoImpl.java

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+package com.capg.dao;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityTransaction;
+
+import com.capg.config.JPAConfig;
+import com.capg.pojo.Employee;
+
+public class EmployeeDaoImpl implements EmployeeDao{
+	EntityManager eManager=JPAConfig.getEntityManager();
+	
+	@Override
+	public String saveEmployee(Employee emp) {
+		EntityTransaction tx=eManager.getTransaction();
+		tx.begin();
+		eManager.persist(emp);
+		tx.commit();
+		return "Employee Created.... Your ID is "+emp.getEmpid();
+	}
+}

src/com/capg/pl/EmployeeMain.java

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+package com.capg.pl;
+
+import java.util.Date;
+
+import com.capg.pojo.Employee;
+import com.capg.service.EmployeeService;
+import com.capg.service.EmployeeServiceImpl;
+
+public class EmployeeMain {
+
+	public static void main(String[] args) {
+		EmployeeService es=new EmployeeServiceImpl();
+		Employee e=new Employee("Saurabh", 35000, new Date());
+		String result=es.createEmployee(e);
+		System.out.println("======================");
+		System.out.println(result);
+		System.out.println("======================");
+		
+
+	}
+
+}

src/com/capg/pojo/Employee.java

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+package com.capg.pojo;
+
+import java.util.Date;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import javax.persistence.Temporal;
+import javax.persistence.TemporalType;
+
+@Entity
+@Table(name="EmployeeDetails")
+public class Employee {
+	@Id
+	@GeneratedValue(strategy=GenerationType.AUTO)
+	private int empid;
+	@Column(name="EmployeeName")
+	private String name;
+	private double salary;
+	@Temporal(TemporalType.DATE)
+	@Column(name="DateOfJoining")
+	private Date doj;
+	
+	public Employee() {
+		
+	}
+	public Employee(String name, double salary, Date doj) {
+		super();
+		this.name = name;
+		this.salary = salary;
+		this.doj = 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 double getSalary() {
+		return salary;
+	}
+	public void setSalary(double salary) {
+		this.salary = salary;
+	}
+	public Date getDoj() {
+		return doj;
+	}
+	public void setDoj(Date doj) {
+		this.doj = doj;
+	}
+
+	
+	
+
+}

src/com/capg/service/EmployeeService.java

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+package com.capg.service;
+
+import com.capg.pojo.Employee;
+
+public interface EmployeeService {
+	public String createEmployee(Employee emp);
+
+}

src/com/capg/service/EmployeeServiceImpl.java

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+package com.capg.service;
+
+import com.capg.dao.EmployeeDao;
+import com.capg.dao.EmployeeDaoImpl;
+import com.capg.pojo.Employee;
+
+public class EmployeeServiceImpl implements EmployeeService {
+	
+	EmployeeDao edao=new EmployeeDaoImpl();
+	
+	@Override
+	public String createEmployee(Employee emp) {
+		if(emp.getName().length()<4 || emp.getSalary()<20000)
+			return "Invalid Employee Data";
+		else
+			return edao.saveEmployee(emp);
+	}
+
+}