@JoinColumn批注中名称和referencedColumnName之间的区别? [英] Difference between name and referencedColumnName in @JoinColumn annotation?

问题描述

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

如果2个表被多个链接到一个关联，则应在name和referencedColumnName列中放置哪些值?

what values are to be placed in name and referencedColumnName column if 2 tables are linked by many to one association?

推荐答案

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 Entity类的加入列将为

Now your join column for Employee Entity class will be

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

因此referencedColumnName表示您要从外键列引用的列.

So referencedColumnName means column that you are referencing to from your foreign key column.

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