java - @JoinColumn 注解中名称和引用列名的区别？

Question

@ManyToOne
@JoinColumn(name = "someValue" , referencedColumnName = "someOtherValue" )

如果 2 个表通过 ManyToOne 关联链接，应该在 name 和 referencedColumnName 列中放置什么值？

Answer 1

假设您有两个表:

1. Department table with columns:
 a. Dept_ID (primary key)
 b. Dept_Name

2. Employee Table with following column:
  a. Emp_Id (primary key)
  b. Dept_Id_fk (foreign key)
  c. Salary

现在您的 Employee 实体类的连接列将是

@ManyToOne
@JoinColumn(name = "Dept_Id_fk", referencedColumnName = "Dept_ID")
Department department;

因此 referencedColumnName 表示您从外键列引用的列。