hibernate-batch-updates

How Hibernate Batch insert works?

阅读更多关于 How Hibernate Batch insert works?

问题 Can some one explain me how hibernate.jdbc.batch_size=1000 and if (i % 100 == 0 && i>0) { session.flush(); session.clear(); } together works ? ... 回答1: Hibernate property hibernate.jdbc.batch_size is a way for hibernate to optimize your insert or update statetment whereas flushing loop is about memory exhaustion. Without batchsize when you try to save an entity hibernate fire 1 insert statement, thus if you work with a big collection, for each save hibernate fire 1 statement Imagine the

HQL - update query is not woring

阅读更多关于 HQL - update query is not woring

问题 I have done the Hibernate implementation.Here is a code related to update function. Query updateQuery = session.createQuery(" update User set registered = '1' " + " where user_activation_key = '"+userUUID+"'"); int result = updateQuery.executeUpdate(); session.getTransaction().commit(); I'm getting this exception Exception in thread "main" org.hibernate.QueryException: query must begin with SELECT or FROM: update [ update com.shop.domain.User set registered = '1' where user_activation_key =

Spring Boot JPA Bulk insert

阅读更多关于 Spring Boot JPA Bulk insert

问题 I have 3 Entities Parent,Child,SubChild. Parent is a parent of Child and Child is a parent of SubChild. I need to insert around 700 objects of Parent. Parent can have 50 Objects of Child. Child can have 50 objects of SubChild. I tried normal repository.save(ListOfObjects) it takes approx 4mins. Then I tried using entity manager's persist , flush and clear based on batch size(500). This also took approx 4 mins. There wasn't much difference in performance. Please suggest a best way to insert

Spring Boot JPA Bulk insert

阅读更多关于 Spring Boot JPA Bulk insert

I have 3 Entities Parent,Child,SubChild. Parent is a parent of Child and Child is a parent of SubChild. I need to insert around 700 objects of Parent. Parent can have 50 Objects of Child. Child can have 50 objects of SubChild. I tried normal repository.save(ListOfObjects) it takes approx 4mins. Then I tried using entity manager's persist , flush and clear based on batch size(500). This also took approx 4 mins. There wasn't much difference in performance. Please suggest a best way to insert such a high amount of data efficiently. Parent @Entity public class Parent { @Id @GeneratedValue(strategy