EntityManager持久（）不保存任何东西到数据库 [英] EntityManager persist() not saving anything to database

问题描述

我的entityManager persist（）从序列中获取id并将其放到我的Image对象中，但Image对象本身没有显示在数据库中。 EntityManager.flush（）给出一个错误，所以我不能以这种方式提交。这是我的代码。

  @Repository 
 public class ImageDaoImpl extends BaseDao implements ImageDao {
 $ b $ @PersistenceContext 
 protected EntityManager entityManager; 
 
 @Override 
 @Transactional 
 public void create（Image image）{
 JpaTemplate jpaTemplate = getJpaTemplate（entityManager）; 
 jpaTemplate.persist（image）; 
 
  

 

  @Repository 
 public class BaseDao {
 
 private JpaTemplate jpaTemplate; 
 
 
 public JpaTemplate getJpaTemplate（EntityManager entityManager）{
 if（jpaTemplate == null）
 jpaTemplate = new JpaTemplate（entityManager）; 
返回jpaTemplate; 
 
  

 

 < bean id =entityManagerFactory
 class =org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean
p：dataSource-ref =dataSource> 
< property name =jpaVendorAdapter> 
< bean class =org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter> 
< property name =showSqlvalue =true/> 
< property name =generateDdlvalue =true/> 
< property name =databasePlatformvalue =org.hibernate.dialect.PostgreSQLDialect/> 
< / bean> 
< / property> 
< property name =persistenceUnitNamevalue =sample>< / property> 
< / bean> 
 
 
 
 <！ -   -  DataSource设置 - > 
< bean id =dataSourceclass =org.springframework.jdbc.datasource.DriverManagerDataSource> 
< property name =driverClassNamevalue =org.postgresql.Driver/> 
< property name =urlvalue =jdbc：postgresql：// localhost：5432 / imageCapture/> 
< property name =usernamevalue =myusername/> 
< property name =passwordvalue =mypassword/> 
< / bean> 
 
 
< bean id =transactionManagerclass =org.springframework.orm.jpa.JpaTransactionManager> 
< property name =entityManagerFactoryref =entityManagerFactory/> 
< / bean> 
 
< tx：注解驱动的事务管理器=transactionManager/> 
  

解决方案

怀疑@交易拦截器没有正确拦截。

My entityManager persist() gets id from sequence and puts it to my Image object but the Image object itself is not showing up in the database. EntityManager.flush() gives an error so I can't commit this way. Here is my code.

@Repository
public class ImageDaoImpl extends BaseDao implements ImageDao {

@PersistenceContext
protected EntityManager entityManager;

@Override
@Transactional
public void create(Image image) {       
    JpaTemplate jpaTemplate = getJpaTemplate(entityManager);
    jpaTemplate.persist(image);
}

 

@Repository
public class BaseDao {

private JpaTemplate jpaTemplate;


public JpaTemplate getJpaTemplate(EntityManager entityManager){
    if(jpaTemplate == null)
        jpaTemplate = new JpaTemplate(entityManager);
    return jpaTemplate;
}

 

<bean id="entityManagerFactory"
       class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
       p:dataSource-ref="dataSource">
       <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="true" />
                <property name="generateDdl" value="true" />
                <property name="databasePlatform" value="org.hibernate.dialect.PostgreSQLDialect" />
            </bean>
        </property>
        <property name="persistenceUnitName" value="sample"></property>
    </bean>



    <!-- DataSource Setup -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="org.postgresql.Driver" />
        <property name="url" value="jdbc:postgresql://localhost:5432/imageCapture" />
        <property name="username" value="myusername" />
        <property name="password" value="mypassword" />
    </bean>


    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager" />

解决方案

This generally happens when Transaction in not applied.. I doubt @Transactional interceptor is not intercepting properly.

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