Assert.notNull(entity, "Entity must not be null."); if (this.entityInformation.isNew(entity)) { this.em.persist(entity); return entity; } else { return this.em.merge(entity); } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 简单解释一下,当传入一个实体,首先判断是否存在id, this.entity...
delete(findById(id).orElseThrow(() ->newEmptyResultDataAccessException( String.format("No %s entity with id %s exists!", entityInformation.getJavaType(), id),1))); }@Transactionalpublicvoiddelete(T entity){ Assert.notNull(entity,"The entity must not be null!"); em.remove(em.contains(e...
Assert.notNull(entityInformation,"JpaEntityInformation must not be null!"); Assert.notNull(entityManager,"EntityManager must not be null!");this.entityInformation = entityInformation;this.entityManager = entityManager;this.entityName = entityInformation.getEntityName();this.entityClass = entityInformation....
@Entity @Table(name="user") public class User { @Id @Column(name="uid") @GeneratedValue(strategy=GenerationType.IDENTITY) private Long id; //more code } When I POST user JSON without uid , I am getting error as the given id must not be null .应该不是这种情况,而 uid 应该由数据库...
然而,我的单元测试将抛出一个异常错误。当我在测试中调用save服务时,它将抛出一个java.lang.NullPointerException: movieRepository.save(movie) must not be null。我不确定“不得为空”指的是什么项目,因为我同时记录了movieRepository和movie以获得一些值。
EntityManager 对象在一组实体类与底层数据源之间进行 O/R 映射的管理。它可以用来管理和更新 Entity Bean, 根椐主键查找 Entity Bean, 还可以通过JPQL语句查询实体。 其源码如下: ** * Interface used to interact with the persistence context. *//这里讲述了EntityManager的作用!!!
@Entity @Table(name= "customer") @Proxy(lazy=false)//不使用懒加载publicclassCustomer { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) @Column(name= "cust_id")privateLong custId; @Column(name= "cust_name")privateString custName;
getBeanDefinition(); Class entityClass = null; try { entityClass=Class.forName(beanDefinition.getBeanClassName()); } catch (ClassNotFoundException e) { e.printStackTrace(); } // 为MyRepositoryFactoryBean的构造函数设置参数,动态传入每个Repository接口类型 beanDefinition.getConstructorArgumentValues()....
最近将IDEA 2018.1版本更新到了2018.2版本，更新好后跑了一下之前的项目，结果就报错了，这个项目集成...
SpringData JPA只是SpringData中的一个子模块，JPA是一套标准接口，而Hibernate是JPA的实现，SpringData J...