這似乎是一個相當簡單和常見的關係問題,可以通過交叉引用表來解決。例如:
CREATE TABLE dbo.Cards (
id INT NOT NULL,
name VARCHAR(50) NOT NULL,
card_text VARCHAR(4000) NOT NULL,
CONSTRAINT PK_Cards PRIMARY KEY CLUSTERED (id)
)
GO
CREATE TABLE dbo.Card_Rulings (
card_id INT NOT NULL,
ruling_number INT NOT NULL,
ruling_text VARCHAR(4000) NOT NULL,
CONSTRAINT PK_Card_Rulings PRIMARY KEY CLUSTERED (card_id, ruling_number)
)
GO
CREATE TABLE dbo.Card_Ruling_Referenced_Cards (
parent_card_id INT NOT NULL,
ruling_number INT NOT NULL,
child_card_id INT NOT NULL,
CONSTRAINT PK_Card_Ruling_Referenced_Cards PRIMARY KEY CLUSTERED (parent_card_id, ruling_number, child_card_id)
)
GO
ALTER TABLE dbo.Card_Rulings
ADD CONSTRAINT FK_CardRulings_Cards FOREIGN KEY (card_id) REFERENCES dbo.Cards(id)
GO
ALTER TABLE dbo.Card_Ruling_Referenced_Cards
ADD CONSTRAINT FK_CardRulingReferencedCards_CardRulings FOREIGN KEY (parent_card_id, ruling_number) REFERENCES dbo.Card_Rulings (card_id, ruling_number)
GO
ALTER TABLE dbo.Card_Ruling_Referenced_Cards
ADD CONSTRAINT FK_CardRulingReferencedCards_Cards FOREIGN KEY (child_card_id) REFERENCES dbo.Cards(id)
GO
要獲得所有卡的裁決爲證:
SELECT C.*
FROM dbo.Card_Rulings CR
INNER JOIN dbo.Card_Ruling_Referenced_Cards CRRC ON CRRC.parent_card_id = CR.card_id
INNER JOIN dbo.Cards C ON C.id = CRRC.child_card_id
WHERE CR.card_id = @card_id
這是所有關閉:
SELECT *
FROM dbo.Cards C
INNER JOIN dbo.Card_Rulings CR ON CR.card_id = C.id
WHERE C.id = @card_id
由給定的卡要獲得裁決中引用的所有卡我的頭頂部沒有經過測試,所以可能有語法錯誤等
你的前端將負責˚F或保持參考。這可能是可取的,因爲它避免了某人忘記在裁決文本中圍繞卡名引號等問題。