问题描述

我有一个表，它有一个引用自身的外键".这将非常有用，除非我不确定如何将第一条记录添加到这样的表中.无论我添加什么，我都无法为表本身提供有效的外来"键，目前还没有条目.也许我没有正确地处理这个问题，但我希望这张表代表一些始终是它自身成员的东西.有没有办法引导"这样的表格，或者另一种方法来进行自我引用?

I have a table which has a "foreign key" referencing itself. This would be very useful, except I am uncertain how to add the first record to such a table. No matter what I add, I cannot provide a valid "foreign" key to the table itself, having no entries yet. Maybe I'm not going about this correctly, but I want this table to represent something that is always a member of itself. Is there a way to "bootstrap" such a table, or another way to go about self-reference?

推荐答案

一个选项是让你的字段NULL-able，并将根记录的父键设置为NULL:

One option is to make your field NULL-able, and set the root record's parent key to NULL:

CREATE TABLE tb_1 (
   id       int   NOT NULL  PRIMARY KEY,
   value    int   NOT NULL,
   parent   int   NULL,
   FOREIGN KEY (parent) REFERENCES tb_1(id)
) ENGINE=INNODB;
Query OK, 0 rows affected (0.43 sec)

-- This fails:
INSERT INTO tb_1 VALUES (1, 1, 0);
ERROR 1452 (23000): A foreign key constraint fails.

-- This succeeds:
INSERT INTO tb_1 VALUES (1, 1, NULL);
Query OK, 1 row affected (0.08 sec)

否则，您仍然可以使用 NOT NULL 父键并将其指向根记录本身:

Otherwise you could still use a NOT NULL parent key and point it to the root record itself:

CREATE TABLE tb_2 (
   id       int   NOT NULL  PRIMARY KEY,
   value    int   NOT NULL,
   parent   int   NOT NULL,
   FOREIGN KEY (parent) REFERENCES tb_2(id)
) ENGINE=INNODB;
Query OK, 0 rows affected (0.43 sec)

-- This fails:
INSERT INTO tb_2 VALUES (1, 1, 0);
ERROR 1452 (23000): A foreign key constraint fails.

-- This succeeds:
INSERT INTO tb_2 VALUES (1, 1, 1);
Query OK, 1 row affected (0.08 sec)

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