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說我有這些類:插入一個Hibernate實體關係
public class Loan {
@Id
private Long id;
@ManyToOne
@JoinColumn(name = "lender_id")
private User lender;
}
public class User {
@Id
private Long id;
@Column
private String userName;
@OneToMany
private List<Loan> loans;
}
現在,讓我們說我有用戶(貸款人)的ID,並在DAO層,我想基礎上,id
創建Loan
的貸款人?
我知道我可以做到以下幾點:
User u = userDao.getUserById(1234L);
loanDao.createLoan(u, "someLoan");
但我不知道是否有可能做到這一點無需預先加載,該User
記錄?