JPA多对多 hibername

// default package

import java.util.logging.Level;
import java.util.logging.Logger;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;
/**
 * @author MyEclipse Persistence Tools
 */
public class EntityManagerHelper {
	
	private static final EntityManagerFactory emf; 
	private static final ThreadLocal threadLocal;
	private static final Logger logger;
	
	static {
		emf = Persistence.createEntityManagerFactory（“jpaMMM“）; 		
		threadLocal = new ThreadLocal（）;
		logger = Logger.getLogger（“jpaMMM“）;
		logger.setLevel（Level.ALL）;
	}
		
	public static EntityManager getEntityManager（） {
		EntityManager manager = threadLocal.get（）;		
		if （manager == null || !mana

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        699  2018-01-29 15:11  jpaMMM\.classpath

     文件        720  2018-01-29 15:10  jpaMMM\.project

     文件        131  2018-01-29 15:11  jpaMMM\.settings\com.genuitec.eclipse.persistence.jpa.prefs

     文件        598  2018-01-29 15:09  jpaMMM\.settings\org.eclipse.jdt.core.prefs

     文件        136  2018-01-29 15:10  jpaMMM\.settings\org.eclipse.jpt.core.prefs

     文件       2062  2018-01-29 15:28  jpaMMM\.settings\org.eclipse.jpt.entitygen.me.hs.hs

     文件        330  2018-01-29 15:11  jpaMMM\.settings\org.eclipse.wst.common.project.facet.core.prefs.xml

     文件        223  2018-01-29 15:10  jpaMMM\.settings\org.eclipse.wst.common.project.facet.core.xml

     文件       2524  2018-01-29 15:23  jpaMMM\bin\EntityManagerHelper.class

     文件       1632  2018-01-29 15:28  jpaMMM\bin\GroupRole.class

     文件       3972  2018-01-29 15:23  jpaMMM\bin\GroupRoleDAO.class

     文件       1334  2018-01-29 16:00  jpaMMM\bin\grouproletest.class

     文件       1663  2018-01-29 15:28  jpaMMM\bin\GroupUser.class

     文件       3720  2018-01-29 15:23  jpaMMM\bin\GroupUserDAO.class

     文件       1337  2018-01-29 15:57  jpaMMM\bin\groupusertest.class

     文件        629  2018-01-29 15:23  jpaMMM\bin\IGroupRoleDAO.class

     文件        507  2018-01-29 15:23  jpaMMM\bin\IGroupUserDAO.class

     文件        605  2018-01-29 15:28  jpaMMM\bin\ITGroupDAO.class

     文件        595  2018-01-29 15:28  jpaMMM\bin\ITRoleDAO.class

     文件        595  2018-01-29 15:23  jpaMMM\bin\ITUserDAO.class

     文件        945  2018-01-29 15:28  jpaMMM\bin\meta-INF\persistence.xml

     文件       2409  2018-01-29 16:03  jpaMMM\bin\TGroup.class

     文件       3970  2018-01-29 15:28  jpaMMM\bin\TGroupDAO.class

     文件       1845  2018-01-29 16:01  jpaMMM\bin\TRole.class

     文件       3938  2018-01-29 15:28  jpaMMM\bin\TRoleDAO.class

     文件       2199  2018-01-29 15:49  jpaMMM\bin\TUser.class

     文件       3885  2018-01-29 15:23  jpaMMM\bin\TUserDAO.class

     文件       1852  2018-01-29 15:47  jpaMMM\bin\T_user.class

     文件       1602  2018-01-29 15:11  jpaMMM\src\EntityManagerHelper.java

     文件       1385  2018-01-29 15:11  jpaMMM\src\GroupRole.java

............此处省略27个文件信息