IntroductionSpring45_1

IntroductionSpring45_1.java

package com.pig.database.databasedemo.jpa;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.transaction.Transactional;

import org.springframework.stereotype.Repository;

import com.pig.database.databasedemo.entity.Person;

@Repository
@Transactional
public class PersonJpaRepository {

	//connect to database
	@PersistenceContext
	EntityManager entityManager;
	
	public Person findById(int Id) {
		return entityManager.find(Person.class, Id); //JPA
	}

	//SQL Update  NEW!!!
	public Person update(Person person) {
		return entityManager.merge(person);   //都是用merge
	}

	//SQL Insert  NEW!!!
	public Person insert(Person person) {
		return entityManager.merge(person);   //都是用merge
	}	
}