{"id":179410,"date":"2024-11-09T01:35:18","date_gmt":"2024-11-08T17:35:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179410\/"},"modified":"2024-11-09T01:35:18","modified_gmt":"2024-11-08T17:35:18","slug":"%e5%a6%82%e4%bd%95%e5%84%aa%e5%8c%96%e5%bc%b1%e8%81%af%e7%b9%ab%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%ad%e8%a8%88-%e5%bc%b1%e8%81%af%e7%b9%ab-%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179410\/","title":{"rendered":"\u5982\u4f55\u512a\u5316\u5f31\u806f\u7e6b\u6578\u64da\u5eab\u8a2d\u8a08 (\u5f31\u806f\u7e6b \u6578\u64da\u5eab)"},"content":{"rendered":"

\u5982\u4f55\u512a\u5316\u5f31\u806f\u7e6b\u6578\u64da\u5eab\u8a2d\u8a08 (\u5f31\u806f\u7e6b \u6578\u64da\u5eab)<\/h1>\n

\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u5f31\u806f\u7e6b\uff08Weak Relationship\uff09\u662f\u6307\u5169\u500b\u5be6\u9ad4\u4e4b\u9593\u7684\u95dc\u4fc2\uff0c\u5176\u4e2d\u4e00\u500b\u5be6\u9ad4\u7684\u5b58\u5728\u4f9d\u8cf4\u65bc\u53e6\u4e00\u500b\u5be6\u9ad4\u3002\u9019\u7a2e\u8a2d\u8a08\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u662f\u5fc5\u8981\u7684\uff0c\u4f46\u5982\u679c\u4e0d\u52a0\u4ee5\u512a\u5316\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u5197\u9918\u3001\u67e5\u8a62\u6548\u7387\u4f4e\u4e0b\u7b49\u554f\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u512a\u5316\u5f31\u806f\u7e6b\u6578\u64da\u5eab\u8a2d\u8a08\uff0c\u4ee5\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u53ef\u7dad\u8b77\u6027\u3002<\/p>\n

\u7406\u89e3\u5f31\u806f\u7e6b\u7684\u6982\u5ff5<\/h2>\n

\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u5f31\u806f\u7e6b\u901a\u5e38\u6d89\u53ca\u5230\u4e3b\u5be6\u9ad4\u548c\u5f9e\u5be6\u9ad4\u7684\u95dc\u4fc2\u3002\u4e3b\u5be6\u9ad4\u64c1\u6709\u7368\u7acb\u7684\u5b58\u5728\uff0c\u800c\u5f9e\u5be6\u9ad4\u5247\u4f9d\u8cf4\u65bc\u4e3b\u5be6\u9ad4\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u8a02\u55ae\u7cfb\u7d71\u4e2d\uff0c\u8a02\u55ae\uff08\u4e3b\u5be6\u9ad4\uff09\u548c\u8a02\u55ae\u9805\u76ee\uff08\u5f9e\u5be6\u9ad4\uff09\u4e4b\u9593\u7684\u95dc\u4fc2\u5c31\u662f\u4e00\u7a2e\u5f31\u806f\u7e6b\u3002\u8a02\u55ae\u9805\u76ee\u7121\u6cd5\u7368\u7acb\u5b58\u5728\uff0c\u5fc5\u9808\u4f9d\u8cf4\u65bc\u67d0\u500b\u7279\u5b9a\u7684\u8a02\u55ae\u3002<\/p>\n

\u512a\u5316\u5f31\u806f\u7e6b\u6578\u64da\u5eab\u8a2d\u8a08\u7684\u7b56\u7565<\/h2>\n

1. \u6b63\u78ba\u4f7f\u7528\u4e3b\u9375\u548c\u5916\u9375<\/h3>\n

\u5728\u8a2d\u8a08\u5f31\u806f\u7e6b\u6642\uff0c\u9078\u64c7\u5408\u9069\u7684\u4e3b\u9375\u548c\u5916\u9375\u81f3\u95dc\u91cd\u8981\u3002\u4e3b\u9375\u61c9\u8a72\u662f\u552f\u4e00\u7684\uff0c\u80fd\u5920\u552f\u4e00\u6a19\u8b58\u6bcf\u4e00\u689d\u8a18\u9304\uff0c\u800c\u5916\u9375\u5247\u7528\u65bc\u5efa\u7acb\u5169\u500b\u8868\u4e4b\u9593\u7684\u806f\u7e6b\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n

CREATE TABLE Orders (\n    OrderID INT PRIMARY KEY,\n    OrderDate DATETIME\n);\n\nCREATE TABLE OrderItems (\n    OrderItemID INT PRIMARY KEY,\n    OrderID INT,\n    ProductName VARCHAR(100),\n    FOREIGN KEY (OrderID) REFERENCES Orders(OrderID)\n);\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cOrderItems \u8868\u4f9d\u8cf4\u65bc Orders \u8868\uff0c\u901a\u904e\u5916\u9375 OrderID \u4f86\u5efa\u7acb\u806f\u7e6b\u3002<\/p>\n
2. \u6e1b\u5c11\u6578\u64da\u5197\u9918<\/h3>\n
\u5728\u5f31\u806f\u7e6b\u7684\u8a2d\u8a08\u4e2d\uff0c\u6578\u64da\u5197\u9918\u662f\u4e00\u500b\u5e38\u898b\u554f\u984c\u3002\u70ba\u4e86\u6e1b\u5c11\u5197\u9918\uff0c\u53ef\u4ee5\u8003\u616e\u5c07\u91cd\u8907\u7684\u6578\u64da\u79fb\u5230\u7368\u7acb\u7684\u8868\u4e2d\uff0c\u4e26\u901a\u904e\u5916\u9375\u9032\u884c\u95dc\u806f\u3002\u4f8b\u5982\uff0c\u5982\u679c\u591a\u500b\u8a02\u55ae\u9805\u76ee\u5171\u4eab\u76f8\u540c\u7684\u7522\u54c1\u4fe1\u606f\uff0c\u53ef\u4ee5\u5c07\u7522\u54c1\u4fe1\u606f\u63d0\u53d6\u5230\u4e00\u500b\u7368\u7acb\u7684 Products \u8868\u4e2d\uff1a<\/p>\n
CREATE TABLE Products (\n    ProductID INT PRIMARY KEY,\n    ProductName VARCHAR(100)\n);\n\nCREATE TABLE OrderItems (\n    OrderItemID INT PRIMARY KEY,\n    OrderID INT,\n    ProductID INT,\n    FOREIGN KEY (OrderID) REFERENCES Orders(OrderID),\n    FOREIGN KEY (ProductID) REFERENCES Products(ProductID)\n);\n<\/code><\/pre>\n
3. \u4f7f\u7528\u7d22\u5f15\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd<\/h3>\n
\u5728\u5f31\u806f\u7e6b\u6578\u64da\u5eab\u4e2d\uff0c\u67e5\u8a62\u6027\u80fd\u53ef\u80fd\u6703\u53d7\u5230\u5f71\u97ff\u3002\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u53ef\u4ee5\u5728\u5916\u9375\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\u3002\u9019\u6a23\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\uff0c\u7279\u5225\u662f\u5728\u9032\u884c\u806f\u63a5\u64cd\u4f5c\u6642\u3002\u4f8b\u5982\uff1a<\/p>\n
CREATE INDEX idx_orderid ON OrderItems(OrderID);\n<\/code><\/pre>\n
4. \u8003\u616e\u4f7f\u7528\u8996\u5716<\/h3>\n
\u8996\u5716\u53ef\u4ee5\u5e6b\u52a9\u7c21\u5316\u67e5\u8a62\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u8907\u96dc\u7684\u5f31\u806f\u7e6b\u6642\u3002\u901a\u904e\u5275\u5efa\u8996\u5716\uff0c\u53ef\u4ee5\u5c07\u591a\u500b\u8868\u7684\u6578\u64da\u6574\u5408\u5728\u4e00\u8d77\uff0c\u5f9e\u800c\u7c21\u5316\u67e5\u8a62\u8a9e\u53e5\u3002\u4f8b\u5982\uff1a<\/p>\n
CREATE VIEW OrderDetails AS\nSELECT o.OrderID, o.OrderDate, oi.ProductName\nFROM Orders o\nJOIN OrderItems oi ON o.OrderID = oi.OrderID;\n<\/code><\/pre>\n
\u7d50\u8ad6<\/h2>\n
\u512a\u5316\u5f31\u806f\u7e6b\u6578\u64da\u5eab\u8a2d\u8a08\u662f\u4e00\u500b\u91cd\u8981\u7684\u904e\u7a0b\uff0c\u80fd\u5920\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u53ef\u7dad\u8b77\u6027\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528\u4e3b\u9375\u548c\u5916\u9375\u3001\u6e1b\u5c11\u6578\u64da\u5197\u9918\u3001\u4f7f\u7528\u7d22\u5f15\u4ee5\u53ca\u8003\u616e\u4f7f\u7528\u8996\u5716\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u6539\u5584\u6578\u64da\u5eab\u7684\u7d50\u69cb\u548c\u67e5\u8a62\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9019\u4e9b\u512a\u5316\u7b56\u7565\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u61c9\u7528\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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