Cascading deletes are a scary concept initially 級聯(lián)刪除起初是一個可怕的概念。
Relationship should not trigger a cascading delete 關(guān)系不應(yīng)觸發(fā)級聯(lián)刪除。
Relationships defined , you may trigger a cascading delete 關(guān)系,則有可能會觸發(fā)級聯(lián)( cascading )刪除。
Cascade delete in database speak 級聯(lián)刪除) 。
For database cascading delete 級聯(lián)刪除
Cascade deletes all rows containing data involved in the foreign key relationship 級聯(lián)刪除包含外鍵關(guān)系中所涉及的數(shù)據(jù)的所有行。
Now that you know all about cascading deletes and you ve promised to be careful , you can see the actual code to execute the embedded 如果您已經(jīng)完全了解了級聯(lián)刪除,并保證會多加小心,那么您就可以來看執(zhí)行嵌入的
Users can exists outside of a group ; that is , aggregation not composition in database speak no cascade delete relationship exists between 用戶可以存在于組外,即是aggregation而不是composition (用數(shù)據(jù)庫的說法,在