jpa 批量插入

@Override

@Transactional

public <S extends E> List<S> save(Iterable<S> entities) {

List<S> result = new ArrayList<>();

 if (entities == null) {

return result;

 }

Iterator<S> iterator = entities.iterator();

 int i = 0;

 int count = 0;

 //遍历循环 每20个(可以做成配置中读取) insert 批量插入一次库

 while (iterator.hasNext()) {

S entity = iterator.next();

 	entityManager.persist(entity);

 	result.add(entity);

	 i++;

 if (i % 20 == 0) {

entityManager.flush();

 	 entityManager.clear();

 count=0;

 }else {

count++;

 }

}

//判断 是否有剩余未flush的 最后flush

 if (count>0){

entityManager.flush();

 entityManager.clear();

 }

return result;

}

https://github.com/Alexey-/spring-boot-batch/blob/master/src/main/resources/application.properties