我从@Entity
类自动创建表时遇到问题。当我手动创建表时,一切正常。我可以注入entityManager,依此类推。我发现了许多类似this的解决方案,但不适用于我。我的配置:persistence.xml
<persistence-unit name="entityManagerFactory"
transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:jdbc/oracleTest</jta-data-source>
<class>pl.example.was.test.entity.ResourceEntity</class>
<properties>
<property name="packagesToScan" value="pl.example.was.test.entity" />
<property name="hibernate.archive.autodetection" value="class, hbm" />
<property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect" />
<property name="hibernate.hbm2ddl.auto" value="create-drop" />
<property name="show_sql" value="true" />
<property name="format_sql" value="true" />
<property name="hibernate.hbm2ddl.auto" value="true" />
<property name="hibernate.transaction.factory_class"
value="org.hibernate.transaction.CMTTransactionFactory" />
<property name="hibernate.transaction.manager_lookup_class"
value="org.hibernate.transaction.WebSphereExtendedJTATransactionLookup" />
</properties>
</persistence-unit>
实体类的一部分
@Entity
public class ResourceEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
// getters setters //
注入
EntityManager
@PersistenceContext
private EntityManager em;
我正在创建两种测试方法
public void addResource(ResourceEntity selectedResource, Locale locale) {
selectedResource.setLocale(locale.toString());
try{
Session session = em.unwrap(Session.class);
Transaction tx = session.beginTransaction();
session.save(selectedResource);
session.flush();
session.clear();
tx.commit();
session.close();
}catch (Exception ex){
ex.printStackTrace();
}
}
和
public void addResource2(ResourceEntity selectedResource, Locale locale) {
selectedResource.setLocale(locale.toString());
em.persist(selectedResource);
}
我读到必须在自动创建表之后创建
Session
对象或EntityManager
,但不是我的情况。我的冬眠依赖
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.2.7.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.2.7.Final</version>
</dependency>
有人有主意吗?
感谢帮助
最佳答案
这肯定是有问题的:
<property name="hibernate.hbm2ddl.auto" value="create-drop" />
您要让Hibernate在会话结束时删除架构。这就是为什么您最终没有表的原因。您可能想要的是:
<property name="hibernate.hbm2ddl.auto" value="create" />
此外,
true
不是hibernate.hbm2ddl.auto
的有效值,因此最好将其删除:<property name="hibernate.hbm2ddl.auto" value="true" />
这已经在here中讨论过了。