我有3个表：lt_hdefaults,lt_hperiods和lt_hrules.在lt_hdefaults中,特定年份的属性有一行.在lt_hperiods表中,可能有多个期间,称为季节.在lt_hrules表中,每个期间可能有多个规则.现在,我无法进行的工作：当用户从lt_hdefaults删除记录时,应从lt_hperiods和lt_hrules表中删除与已删除记录相关的其他数据.我正在尝试通过使用
FOREIGN KEY (lt_year,lt_id) REFERENCES lt_hdefaults(lt_year,lt_id) ON DELETE CASCADE
但是,它不起作用.我知道它看起来很长,但不是很复杂.如果有人有任何想法,我将不胜感激.我知道如何使用mysql,但是我不是这方面的专家.非常感谢.
以下示例：
CREATE TABLE IF NOT EXISTS lt_hdefaults (
lt_year year(4) NOT NULL DEFAULT '0000',
lt_id int(255) NOT NULL DEFAULT '0',
period_name varchar(45) NOT NULL DEFAULT 'Default',
min_stay int(10) NOT NULL DEFAULT '1',
max_stay int(10) NOT NULL,
weekly_rate float(10,2) NOT NULL,
nightly_rate float(10,2) NOT NULL,
PRIMARY KEY (lt_year,lt_id)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
CREATE TABLE IF NOT EXISTS lt_hperiods (
period_id int(255) NOT NULL ,
lt_id int(255) NOT NULL,
lt_year year(4) NOT NULL DEFAULT '0000',
period_name varchar(45) NOT NULL,
min_stay int(10) NOT NULL,
max_stay int(10) NOT NULL,
fromDate date NOT NULL,
toDate date NOT NULL,
weekly_rate float(10,2) DEFAULT NULL,
nightly_rate float(10,2) NOT NULL,
arriveDepartDays varchar(150) DEFAULT 'sunday,monday,tuesday,wednesday,thursday,friday,saturday',
noArriveDepartDays varchar(150) DEFAULT NULL,
PRIMARY KEY (period_id),
FOREIGN KEY (lt_year,lt_id) REFERENCES lt_hdefaults(lt_year,lt_id) ON DELETE CASCADE
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=107 ;
CREATE TABLE IF NOT EXISTS lt_hrules (
period_id int(255) NOT NULL,
lt_id int(255) NOT NULL,
lt_year year(4) NOT NULL DEFAULT '0000',
rule_name varchar(45) NOT NULL,
night_of_stay int(10) NOT NULL,
fixed_rate float(10,2) NOT NULL,
PRIMARY KEY (period_id,lt_id,night_of_stay),
FOREIGN KEY (period_id) REFERENCES lt_hperiods(period_id) ON DELETE CASCADE
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
INSERT INTO lt_hdefaults (lt_year, lt_id, period_name, min_stay, max_stay, weekly_rate, nightly_rate, min_guests, max_guests, surchargeAboveGuests, chargePerGuestFee, bondFee, cleaningFee, bookingServiceFee) VALUES
(, 2, 'Default', 0, 0, 1200.00, 171.43, 2, 5, 6, 85.00, 1000.00, 120.00, 0.00),
(, 3, 'Default', 0, 0, 1300.00, 185.71, 2, 5, 6, 44.00, 1000.00, 120.00, 0.00);
INSERT INTO lt_hperiods (period_id, lt_id, lt_year, period_name, min_stay, max_stay, fromDate, toDate, weekly_rate, nightly_rate, arriveDepartDays, noArriveDepartDays) VALUES
(105, 3, , 'winter', 2, 66, '-12-22', '-01-15', 1500.00, 214.29, 'Monday,Tuesday,Wednesday,Thursday', 'Friday,Saturday,Sunday'),
(106, 3, , 'summer', 2, 77, '-01-14', '-01-28', 4000.00, 571.43, 'Monday,Tuesday,Wednesday,Thursday,Friday,Saturday', 'Sunday');
INSERT INTO lt_hrules (period_id, lt_id, lt_year, rule_name, night_of_stay, fixed_rate) VALUES
(106, 3, , 'r2', 2, 222.00),
(106, 3, , 'r1', 1, 111.00),
(105, 3, , 'r2', 2, 222.00),
(105, 3, , 'r1', 1, 111.00);
解决方法:
ENGINE = MyISAM
标签：mysql,cascading-deletes,cascade
来源： https://codeday.me/bug/1013/1909934.html
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