EntityManager persist()方法不会将记录插入数据库 [英] EntityManager persist() method does not insert record to database
问题描述
我有使用 EntityManager.persist(Object)
方法的问题。现在,当我摆脱其他问题时,通过应用程序工作而无需Exception,但对象不会放在我的数据库中。
我的实体类:
@Entity
@Table(name =Chain)
public class Chain implements Serializable {
@ Id
@Column(name =id)
私人长ID;
@Column(name =date)
私人日期日期;
@Column(name =name)
私人字符串名称;
// setters and getters
}
my dao class:
@Transactional
@Repository(ChainDao)
公共类ChainDaoImpl实现ChainDao {
私人EntityManager em;
@PersistenceContext
public void setEntityManager(EntityManager em){
this。 em = em;
}
public int saveChain(Chain chain){
chain.setDate(new Date());
chain.setId((long)44);
布尔a;
em.persist(chain);
返回222;
my xml context:
< bean id =entityManagerFactoryclass =org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean>
< property name =persistenceXmlLocationvalue =classpath *:META-INF / persistence.xml>< / property>< / bean>
< bean class =org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor/>
< bean class =org.springframework.orm.jpa.JpaTransactionManager>
< property name =entityManagerFactory
ref =entityManagerFactory/>
< / bean>
< bean id =transactionManagerclass =org.springframework.orm.jpa.JpaTransactionManager>
< property name =entityManagerFactoryref =entityManagerFactory/>
< / bean>
和 pereistence.xml
:
< persistence xmlns =http://java.sun.com/xml/ns/persistenceversion =1.0>
< persistence-unit name =sample>
< provider> org.hibernate.ejb.HibernatePersistence< / provider>
<! - 扫描注释类和Hibernate映射XML文件 - >
<属性>
< property name =hibernate.archive.autodetectionvalue =class,hbm/>
< property name =hibernate.connection.driver_classvalue =org.postgresql.Driver/>
< property name =hibernate.connection.urlvalue =jdbc:postgresql:// localhost:5432 / database/>
< property name =hibernate.connection.usernamevalue =postgres/>
< property name =hibernate.connection.passwordvalue =pwd/>
< property name =hibernate.dialectvalue =org.hibernate.dialect.PostgreSQLDialect/>
< property name =hibernate.show_sqlvalue =true/>
< / properties>
< / persistence-unit>
< /持久性>
有没有人知道我错过了什么?
你是否得到一个特定的异常?如果你知道它是什么会很有帮助的。
在Stackoverflow上有许多类似的问题:
这些建议您应该尝试添加 您还应该检查是否已通过以下行的方式启用事务注释: 在您的.xml配置中 I have problem with using my entity class: my dao class: my xml context: and Do anyone have a idea what am i missing? Are you getting a specific exception? It would be helpful to know what it is if you are. There are a number of similar problems to this already on Stackoverflow: Spring transactional context doesn't persist data Spring, Hibernate & JPA: Calling persist on entitymanager does not seem to commit to database These suggest that you should try adding You should also check that you have enabled transactional annotations through a line such as : in your .xml configuration 这篇关于EntityManager persist()方法不会将记录插入数据库的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋! em.flush()在
em.persist(chain)
后改变 @transactional
注解 p>
< tx:annotation-driven transaction-manager =transactionManager/>
EntityManager.persist(Object)
method. Now when i get rid of other problems, by app work without Exception but object is not put in my database.@Entity
@Table(name ="Chain")
public class Chain implements Serializable{
@Id
@Column(name = "id")
private Long id;
@Column(name = "date")
private Date date;
@Column(name = "name")
private String name;
//setters and getters
}
@Transactional
@Repository("ChainDao")
public class ChainDaoImpl implements ChainDao{
private EntityManager em;
@PersistenceContext
public void setEntityManager(EntityManager em) {
this. em = em;
}
public int saveChain(Chain chain) {
chain.setDate(new Date());
chain.setId((long)44);
Boolean a;
em.persist(chain);
return 222;
}
}
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" >
<property name="persistenceXmlLocation" value="classpath*:META-INF/persistence.xml"></property></bean>
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<bean class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory"
ref="entityManagerFactory" />
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
pereistence.xml
:<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">
<persistence-unit name="sample">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<!-- Scan for annotated classes and Hibernate mapping XML files -->
<properties>
<property name="hibernate.archive.autodetection" value="class, hbm"/>
<property name="hibernate.connection.driver_class" value="org.postgresql.Driver"/>
<property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/database"/>
<property name="hibernate.connection.username" value="postgres"/>
<property name="hibernate.connection.password" value="pwd"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
<property name="hibernate.show_sql" value="true"/>
</properties>
</persistence-unit>
</persistence>
em.flush()
after the em.persist(chain)
, and altering the @transactional
annotations <tx:annotation-driven transaction-manager="transactionManager"/>