AbstractTransactionalJUnit4SpringContextTests中的事务回滚

Eric.Zhou — Wed, 04 Nov 2009 12:58:00 GMT

今天同事问了一个问题，关于annotation配置多对多关联映射以后，创建新的对象时候，为什么多对多的关系没有保存到关系表中。具体问题如下：
当前有一个User和一个Role，它们是多对多关系，中间表为user_role存放user和role的id。部分User代码如下：
@ManyToMany(cascade = { CascadeType.PERSIST }, fetch = FetchType.LAZY)
    @JoinTable(name = "user_role",
      joinColumns = @JoinColumn(name = "user_id"),
      inverseJoinColumns = @JoinColumn(name = "role_id"))
public Set getRoles() {
  return roles;
}

public void setRoles(Set roles) {
  this.roles = roles;
}

public void addRole(Role role) {
  if (!this.roles.contains(role)) {
   this.roles.add(role);
  }
}

public void removeRole(Role role) {
  this.roles.remove(role);
}

Role中的部分代码如下：
@ManyToMany(
   cascade = {CascadeType.PERSIST, CascadeType.MERGE},
   mappedBy = "roles",
   targetEntity = User.class
   )
public Set getUsers() {
  return users;
}

而测试代码继承了AbstractTransactionalJUnit4SpringContextTests，代码如下：
@Test
public void testManyToMany() {
  Role oneRole = new Role();
  oneRole.setDescription("manager");
  oneRole.setEnabled(true);
  oneRole.setRoleName("manger");

  Role twoRole = new Role();
  twoRole.setDescription("waitress");
  twoRole.setEnabled(true);
  twoRole.setRoleName("waitress");

  User user = new User();
  user.setEnabled(true);
  user.setPassword("jianghaiying");
  user.setUsername("Jiang HaiYing");
  user.addRole(oneRole);
  user.addRole(twoRole);
  userDAO.persist(user);

  try {
   userDAO.getConnection().commit();
  } catch (SQLException e) {
   e.printStackTrace();
  }
}
这样执行以后，打印出的信息如下：
Hibernate: insert into user (enabled, password, username) values (?, ?, ?)
Hibernate: insert into role (description, enabled, name) values (?, ?, ?)
Hibernate: insert into role (description, enabled, name) values (?, ?, ?)

这时候问题出来了，为什么没有往关系表中插入数据？
其实这并不是代码或者配置写错误了，在正式运行代码一切正常，而是AbstractTransactionalJUnit4SpringContextTests出的鬼，事实上多对多关联关系是由Hibernate去帮我们维护的，而AbstractTransactionalJUnit4SpringContextTests为了保持数据的清洁又会自动回滚。如何解决这个问题呢？
方法：
只需要在test方法上添加@Rollback(false)，不让它回滚，一切正常了。这时候也可以去掉try语句了。
Hibernate: insert into user (enabled, password, username) values (?, ?, ?)
Hibernate: insert into role (description, enabled, name) values (?, ?, ?)
Hibernate: insert into role (description, enabled, name) values (?, ?, ?)
Hibernate: insert into user_role (user_id, role_id) values (?, ?)
Hibernate: insert into user_role (user_id, role_id) values (?, ?)

Eric.Zhou 2009-11-04 20:58 发表评论

项目中封装Spring中的测试基类

Eric.Zhou — Mon, 21 Apr 2008 05:15:00 GMT

package com.founder.common;

import Java.text.SimpleDateFormat;
import Java.util.TimeZone;

import org.hibernate.SessionFactory;
import org.springframework.test.AbstractTransactionalDataSourceSpringContextTests;

/**
* This class is the base class of all the tests,
* we can use the dependency injection functionality of spring in all the tests,
* and the default transaction mode is rollback, so we don't need to write special code to restore data after calling some methods affected database data.
*
* @author Rui Zhou, Copyright © 2008 foundersoftware. All Rights Reserved.
* @version 1.00, 2008-03-22 15:46
*/
public abstract class SpringTestCaseBase extends AbstractTransactionalDataSourceSpringContextTests {

protected SimpleDateFormat sdf;

public SpringTestCaseBase() {
  // query the protected variables to implement denpendency injection automatically,
  // so we don't need to write settor and gettor methods anymore.
  this.setPopulateProtectedVariables(true);

  sdf = new SimpleDateFormat("yyyy-MM-dd");
  sdf.setTimeZone(TimeZone.getDefault());
}

protected String[] getConfigLocations() {
  return new String[] { "file:WebRoot/WEB-INF/applicationContext*.xml"};
    }

protected void flushSession(){
  SessionFactory sessionFactory = (SessionFactory)applicationContext.getBean("sessionFactory");
        sessionFactory.getCurrentSession().flush();
    }
}

Eric.Zhou 2008-04-21 13:15 发表评论

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AbstractTransactionalJUnit4SpringContextTests中的事务回滚

项目中封装Spring中的测试基类