没有唯一的“正确方法”...否则就是API。你调用适合你的应用程序的方法，以及该方法的用例。如果你需要...
没有唯一的“正确方法”...否则就是API。你调用适合你的应用程序的方法，以及该方法的用例。如果你需要...
Opening Quadratic Sieve Jar file in Java I hope the title isn't misleading.. It was hard to come up with a proper name for this. Anyways, I'm trying to implement the Quadratic Sieve method for factoring integers in Java for problem solving p... ...
The PersistObjectWithJPA class InPersistObjectWithJPAclass we create anEntityManagerFactoryinterface to interact with the entity manager factory forMyPeristenceUnit, that is defined inpersistence.xmlfile. We create an EntityManager, using thecreateEntityManager()API method. Then, we create a newProjectM...
https://www.baeldung.com/hibernate-save-persist-update-merge-saveorupdate java - Difference between save and saveOrUpdate method hibernate - Stack Overflow https://stackoverflow.com/questions/17612364/difference-between-save-and-saveorupdate-method-hibernate...
Describe the bug No transaction is being created while trying to persist an entity in a method annotated with @transactional Expected behavior The entity is persisted in the database Actual behavior An Exception is thrown trying to persi...
public interface OrderRepo extends JpaRepository<Order, Integer> { Order findByOrderId(Integer order); } 初始化订单的状态集合以及状态转移事件 在启动springboot时,需要注入状态机的状态,事件的配置。起主要涉及到以下两个类: StateMachineStateConfigurer<S, E> 配置状态集合以及初始状态,泛型参数S代表状态,...
at com.qingmu.SpringDataJPATest02.saveCustomer(SpringDataJPATest02.java:39) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43...
sorry this approach of refreshing the entity before carrying out another operation on the entity manager object gives me " Entity not managed" and calling the same method before calling the refresh method goes back to the detached entity exception. I...
I want to generate log file when exception occurs by using FileWriter. While saving a duplicate entry it throws EntityExistsException and i am unable to write log file in catch .I would be grateful if anybody tell me solution.