通过实体管理器,我试图将实体持久保存在数据库中,但我没有设法持久保存它。这是我的配置。
我有这个实体:
@Entity
@Table(name = "User")
public class UserModel implements Serializable, ModelItem {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
@Column(nullable = false)
private String username;
@Column(nullable = false)
private String password;
@Column(nullable = false)
private String name;
private String surname;
private String notes;
private String cellphone;
@Column(nullable = false)
private String email;
private Boolean enabled;
//get and set methods
.....
}
和我的持久性导入bean:
@Repository
public class ImportServiceImpl implements ImportService {
@PersistenceContext
protected EntityManager entityManager;
@Transactional
public boolean importExample() {
User u= new User();
u.setUsername("username");
u.setPassword("password");
u.setName("name");
u.setEmail("email");
entityManager.persist(u);
}
}
实体管理器和数据库连接的弹簧配置:
<tx:annotation-driven transaction-manager="transactionManager" />
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<tx:annotation-driven />
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true" /> <!-- Prints used SQL to stdout -->
<property name="generateDdl" value="true" /> <!-- Generates tables. -->
<property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect" />
</bean>
</property>
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url">
<value>${db.url}</value>
</property>
<property name="username">
<value>${db.username}</value>
</property>
<property name="password">
<value>${db.password}</value>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
<property name="dataSource" ref="dataSource"/>
</bean>
和我的persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
version="1.0">
<persistence-unit name="application" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/testdata"/>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.password" value="password"/>
<property name="hibernate.connection.username" value="root"/>
<property name="hibernate.hbm2ddl.auto" value="create-drop"/>
</properties>
</persistence-unit>
</persistence>
因此,当我运行我的示例时,我没有收到任何错误,但实体没有保留。我还尝试在坚持后添加 entityManager.flush() 但在这种情况下我收到此错误:
javax.persistence.TransactionRequiredException: no transaction is in progress
at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:793)
所以我认为我的 Transactional bean 没有很好地绑定到该方法,但我无法理解原因。有人知道为什么吗?
我还在 STS 中注意到,对于此事务,生成了 2 个具有相同数据的 bean,它看起来很奇怪(我不知道这是 STS 的错误还是我的配置中的问题,它创建了 2 个 bean):