My 'ON DELETE CASCADE ' does not work

Question

I have got 3 tables: lt_hdefaults, lt_hperiods and lt_hrules. In lt_hdefaults, there is one row for a property for a particul

Answer 1

Something like this works..as an example:

SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";

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),
    INDEX (lt_id),
    INDEX (lt_year),
    CONSTRAINT FOREIGN KEY (`lt_id`, `lt_year`) 
    REFERENCES lt_hdefaults(`lt_id`, `lt_year`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=107;



SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";

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),
    INDEX(period_id),
    CONSTRAINT FOREIGN KEY (`period_id`)
    REFERENCES lt_hperiods(`period_id`) ON DELETE CASCADE
) ENGINE=InnoDB  DEFAULT CHARSET=latin1;

Answer 2

for Foreign key referencing use innoDB

Answer 3

ENGINE=MyISAM <-- MyISAM doesn't support any kind of foreign keys. Use InnoDB instead.