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我有两个表组和跟踪,他们连接。我想删除组记录,并在Tracking中删除外键,但我不知道如何将这个外键删除或更新为NULL值。我不想从Tracking中删除所有记录。任何想法?感谢帮助。级联更新或删除 - kohana
protected $_table_name = 'trackingGroup';
protected $_primary_key = 'trg_id';
protected $_has_many = array(
'tracking' => array(
'model' => 'Orm_tracking',
'foreign_key' => 'tr_trgId',
),
);
protected $_belongs_to = array(
'user' => array(
'model' => 'Orm_users',
'foreign_key' => 'trg_uId',
),
);
function delete(){ //my first idea
foreach($this->tracking->tr_trtId->find() as $tracking)
$tracking->delete();
parent::delete();
}
在追踪表,我有:
tr_id int PK,
tr_uId int FK,
tr_trtId int FK,
tr_trgId int FK,
tr_dateCreate data,
tr_status Char(1)
在TrackingGroups:
trg_Id int PK,
trg_name char(40),
trg_description char(256),
trg_uId int FK
应该如何删除的工作原理:当用户要点击删除按钮,它应该从TrackingGroups删除记录并且还应删除或更新跟踪表中的字段tr_trgId,tr_trgId中应该有NULL值。
plz分享获取创意的代码 – devpro