reportservicebean.java

這個一個用ejb+struts整合的一個登陸介面

package ent.report.service.impl;

import java.util.List;

import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import ent.report.service.ReportService;
import ent.reportbean.Report;

@Stateless
@Remote
public class ReportServiceBean implements ReportService {
	@PersistenceContext(unitName = "ejb")
	EntityManager em;

	public Report getReport(Integer id) {
		return em.find(Report.class, id);
	}

	public void delete(Integer id) {
		em.remove(em.getReference(Report.class, id));
	}

	public void update(Report report) {
		em.merge(report);
	}

	public void saveReport(Report report) {
		em.persist(report);
	}

	@SuppressWarnings("unchecked")
	public List<Report> getReportFromName(String name) {
		String Name = "'" + name + "'";
		return em.createQuery("select o from Report o where o.name=" + Name)
				.getResultList();
	}

	@SuppressWarnings("unchecked")
	public List<Report> getReportFromNumber(String number) {
		String Number = "'" + number + "'";
		return em
				.createQuery("select o from Report o where o.number=" + Number)
				.getResultList();
	}

	@SuppressWarnings("unchecked")
	public List<Report> getReportFromClasses(Integer classes) {
		String c = "'" + classes.toString() + "'";
		return em.createQuery("select o from Report o where o.classes=" + c)
				.getResultList();
	}

	@SuppressWarnings("unchecked")
	public List<Report> getSomeInfo(Integer max, Integer index) {
		Query query = em.createQuery("from Report o");
		return query.setMaxResults(max).setFirstResult(index).getResultList();
	}
}