java - hibernate session 的 get() 和 load() 方法在获取方面有什么区别？

Question

get() 和 load() 方法有什么区别？关于数据获取方法

 public static void main(String[] args) {
    SessionFactory factory= new Configuration().configure().buildSessionFactory();
     Session session = factory.openSession();
     Transaction tx = null;
      tx = session.beginTransaction();
       System.out.println("1 st time calling load method");
        Account acc = 
               (Account)session.load(Account.class, 180); 
             System.out.println("bal"+acc.getBalance());

          System.out.println("2nd   time calling load method");
          Account  acc1=(Account)session.load(Account.class, 180); 
           System.out.println("bal"+acc1.getBalance());


        System.out.println("1 st time calling get method");
     Account acc2= (Account) session.get(Account.class, accId);

      System.out.println("bal"+acc2.getBalance());    

      System.out.println("2 st time calling get method");

     Account  acc2= (Account) session.get(Account.class, accId);

    System.out.println("bal"+acc2.getBalance());


     tx.commit();

   session.close(); 

我得到了以下输出

1 st time calling load method
Hibernate: 
/* load com.abcd.Account */ select
    account0_.ACCOUNTID as ACCOUNTID1_0_,
    account0_.ACCOUNTTYPE as ACCOUNTT2_1_0_,
    account0_.CREATIONDATE as CREATION3_1_0_,
    account0_.BALANCE as BALANCE1_0_ 
from
    a.MYACCOUNT account0_ 
where
    account0_.ACCOUNTID=?
bal3000.0
2nd   time calling load method
bal3000.0
1 st time calling get method
bal3000.0
2 st time calling get method
bal3000.0

从输出中可以清楚地看出 get 方法没有命中数据库。它的行为类似于 load() 方法。谁能告诉我这种行为是否正确。

Answer 1

正如 T Mishra 所说 here :

1. By default, hibernate creates run-time proxies. It loads the objects as a proxy unless a fetch mode is specified or set to false.

2. That's because once the object is loaded in cache, the next subsequent calls perform repeatable read.

3. Although the state of this object changes from persistent to detached

The entity can be retrieved in 2 ways.

load() - returns the proxy object with an identifier.

get() - returns the complete object from database.

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