MySQL 8 NULL外键

时间:2018-10-31 17:34:43

标签: mysql mysql-8.0

我正在创建一些新表,我想用测试数据填充它们,而我在mysql 8中遇到了这个问题。

我总是在表上使用空FK,但现在我不知道发生了什么。

我认为是来自mysql 8的东西,我最近更新了,到现在为止我还没有问题。

我正在使用8.0.12。

我得到的错误是:

  

[23000] [1452]无法添加或更新子行:外键   约束失败(i2cwac_testsite_board_pins,约束   site_board_pins_sensor_types_id_fk外键(id)参考   sensor_typesid))

表创建脚本:

CREATE TABLE site_board_pins
(
    id bigint(20) PRIMARY KEY NOT NULL AUTO_INCREMENT,
    site_board_id bigint(20) NOT NULL,
    e_board_pin_id bigint(20) NOT NULL,
    pin_type_id bigint(20) NOT NULL,
    pin_operation_mode bigint(20) NULL,
    sensor_type_id bigint(20) NULL,
    enabled bit(1) NOT NULL ,
    description varchar(500),
    CONSTRAINT site_board_pins_site_boards_id_fk FOREIGN KEY (id) REFERENCES site_boards (id),
    CONSTRAINT site_board_pins_e_board_pins_id_fk FOREIGN KEY (id) REFERENCES e_board_pins (id),
    CONSTRAINT site_board_pins_pin_types_id_fk FOREIGN KEY (id) REFERENCES pin_types (id),
    CONSTRAINT site_board_pins_pin_operation_mode_id_fk FOREIGN KEY (id) REFERENCES pin_operation_mode (id),
    CONSTRAINT site_board_pins_sensor_types_id_fk FOREIGN KEY (id) REFERENCES sensor_types (id)
);

插入失败:

INSERT INTO `site_board_pins` (`site_board_id`, `e_board_pin_id`, `pin_type_id`, `pin_operation_mode`, `sensor_type_id`, `enabled`)
VALUES
       ((select id from e_boards where name = 'Iboard Pro 1.1'),
        (select ep.id from e_boards eb join e_board_pins ep on ep.e_board_id = eb.id where eb.name = 'Iboard Pro 1.1' and ep.name = 'A1'),
        (select id from pin_types where mode = 'Analog'),
        NULL,
        NULL,
        0);

预先感谢

1 个答案:

答案 0 :(得分:1)

看起来您搞砸了FK定义-所有FK都声明您的Id列存在于所有其他表中。

例如,我很确定您的第一个应该是:

CONSTRAINT site_board_pins_site_boards_id_fk FOREIGN KEY (site_board_id) REFERENCES site_boards (id)