{"id":96258,"date":"2024-10-20T07:55:17","date_gmt":"2024-10-19T23:55:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96258\/"},"modified":"2024-10-20T07:55:18","modified_gmt":"2024-10-19T23:55:18","slug":"oracle%e4%b8%ad%e9%9d%9e%e9%bb%98%e8%aa%8d%e6%96%b9%e5%bc%8f%e5%89%b5%e5%bb%ba%e5%a4%96%e9%8d%b5%e7%9a%84%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96258\/","title":{"rendered":"Oracle\u4e2d\u975e\u9ed8\u8a8d\u65b9\u5f0f\u5275\u5efa\u5916\u9375\u7684\u4f7f\u7528"},"content":{"rendered":"

Oracle\u4e2d\u975e\u9ed8\u8a8d\u65b9\u5f0f\u5275\u5efa\u5916\u9375\u7684\u4f7f\u7528<\/h1>\n

\u5728\u95dc\u806f\u6578\u64da\u5eab\u4e2d\uff0c\u5916\u9375\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u7d04\u675f\uff0c\u7528\u65bc\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u5f0f\u4f86\u5275\u5efa\u5916\u9375\uff0c\u9664\u4e86\u9ed8\u8a8d\u7684\u65b9\u5f0f\u5916\uff0c\u9084\u6709\u4e00\u4e9b\u975e\u9ed8\u8a8d\u7684\u65b9\u5f0f\u53ef\u4ee5\u9748\u6d3b\u61c9\u7528\u3002\u672c\u6587\u5c07\u63a2\u8a0eOracle\u4e2d\u975e\u9ed8\u8a8d\u65b9\u5f0f\u5275\u5efa\u5916\u9375\u7684\u4f7f\u7528\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u3002<\/p>\n

\u5916\u9375\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u5916\u9375\u662f\u6307\u4e00\u500b\u8868\u4e2d\u7684\u4e00\u5217\u6216\u591a\u5217\uff0c\u5176\u503c\u5fc5\u9808\u5728\u53e6\u4e00\u500b\u8868\u7684\u4e3b\u9375\u6216\u552f\u4e00\u9375\u4e2d\u5b58\u5728\u3002\u9019\u7a2e\u7d04\u675f\u6709\u52a9\u65bc\u78ba\u4fdd\u6578\u64da\u7684\u53c3\u7167\u5b8c\u6574\u6027\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u5169\u500b\u8868\uff1aCustomers<\/code>\u548cOrders<\/code>\uff0c\u5176\u4e2dOrders<\/code>\u8868\u4e2d\u7684CustomerID<\/code>\u5217\u662fCustomers<\/code>\u8868\u4e2d\u7684ID<\/code>\u5217\u7684\u5916\u9375\u3002<\/p>\n

\u9ed8\u8a8d\u65b9\u5f0f\u5275\u5efa\u5916\u9375<\/h2>\n

\u5728Oracle\u4e2d\uff0c\u5275\u5efa\u5916\u9375\u7684\u6700\u5e38\u898b\u65b9\u5f0f\u662f\u4f7f\u7528CREATE TABLE<\/code>\u8a9e\u53e5\u3002\u4f8b\u5982\uff1a<\/p>\n

CREATE TABLE Customers (\n    ID NUMBER PRIMARY KEY,\n    Name VARCHAR2(100)\n);\n\nCREATE TABLE Orders (\n    OrderID NUMBER PRIMARY KEY,\n    CustomerID NUMBER,\n    FOREIGN KEY (CustomerID) REFERENCES Customers(ID)\n);<\/code><\/pre>\n
\u4e0a\u8ff0\u4ee3\u78bc\u4e2d\uff0cCustomerID<\/code>\u5217\u88ab\u5b9a\u7fa9\u70ba\u5916\u9375\uff0c\u53c3\u8003\u4e86Customers<\/code>\u8868\u4e2d\u7684ID<\/code>\u5217\u3002<\/p>\n
\u975e\u9ed8\u8a8d\u65b9\u5f0f\u5275\u5efa\u5916\u9375<\/h2>\n
\u9664\u4e86\u9ed8\u8a8d\u7684\u65b9\u5f0f\uff0cOracle\u9084\u652f\u6301\u5176\u4ed6\u4e00\u4e9b\u975e\u9ed8\u8a8d\u7684\u65b9\u5f0f\u4f86\u5275\u5efa\u5916\u9375\u3002\u9019\u4e9b\u65b9\u5f0f\u901a\u5e38\u7528\u65bc\u66f4\u8907\u96dc\u7684\u6578\u64da\u6a21\u578b\u6216\u7279\u5b9a\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n
1. \u4f7f\u7528ALTER TABLE<\/code>\u8a9e\u53e5<\/h3>\n
\u5982\u679c\u8868\u5df2\u7d93\u5b58\u5728\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE<\/code>\u8a9e\u53e5\u4f86\u6dfb\u52a0\u5916\u9375\u7d04\u675f\u3002\u4f8b\u5982\uff1a<\/p>\n
ALTER TABLE Orders\nADD CONSTRAINT fk_customer\nFOREIGN KEY (CustomerID)\nREFERENCES Customers(ID);<\/code><\/pre>\n
\u9019\u7a2e\u65b9\u5f0f\u7684\u597d\u8655\u5728\u65bc\u53ef\u4ee5\u5728\u4e0d\u91cd\u65b0\u5275\u5efa\u8868\u7684\u60c5\u6cc1\u4e0b\u6dfb\u52a0\u5916\u9375\u7d04\u675f\u3002<\/p>\n
2. \u4f7f\u7528\u8907\u5408\u5916\u9375<\/h3>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u4f7f\u7528\u8907\u5408\u5916\u9375\uff0c\u5373\u5916\u9375\u7531\u591a\u500b\u5217\u7d44\u6210\u3002\u4f8b\u5982\uff1a<\/p>\n
CREATE TABLE OrderDetails (\n    OrderID NUMBER,\n    ProductID NUMBER,\n    PRIMARY KEY (OrderID, ProductID),\n    FOREIGN KEY (OrderID) REFERENCES Orders(OrderID),\n    FOREIGN KEY (ProductID) REFERENCES Products(ProductID)\n);<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cOrderDetails<\/code>\u8868\u4e2d\u7684\u5916\u9375\u7d04\u675f\u540c\u6642\u53c3\u8003\u4e86Orders<\/code>\u548cProducts<\/code>\u8868\u3002<\/p>\n
3. \u4f7f\u7528ON DELETE CASCADE<\/code>\u9078\u9805<\/h3>\n
\u5728\u5275\u5efa\u5916\u9375\u6642\uff0c\u53ef\u4ee5\u6307\u5b9aON DELETE CASCADE<\/code>\u9078\u9805\uff0c\u9019\u6a23\u7576\u53c3\u8003\u7684\u884c\u88ab\u522a\u9664\u6642\uff0c\u76f8\u95dc\u7684\u884c\u4e5f\u6703\u81ea\u52d5\u88ab\u522a\u9664\u3002\u4f8b\u5982\uff1a<\/p>\n
ALTER TABLE Orders\nADD CONSTRAINT fk_customer\nFOREIGN KEY (CustomerID)\nREFERENCES Customers(ID)\nON DELETE CASCADE;<\/code><\/pre>\n
\u9019\u7a2e\u65b9\u5f0f\u5728\u8655\u7406\u7236\u5b50\u8868\u95dc\u4fc2\u6642\u975e\u5e38\u6709\u7528\uff0c\u53ef\u4ee5\u81ea\u52d5\u7dad\u8b77\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728Oracle\u4e2d\uff0c\u975e\u9ed8\u8a8d\u65b9\u5f0f\u5275\u5efa\u5916\u9375\u63d0\u4f9b\u4e86\u9748\u6d3b\u6027\u548c\u64f4\u5c55\u6027\uff0c\u80fd\u5920\u6eff\u8db3\u4e0d\u540c\u7684\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f\u4f7f\u7528ALTER TABLE<\/code>\u8a9e\u53e5\u3001\u8907\u5408\u5916\u9375\u9084\u662fON DELETE CASCADE<\/code>\u9078\u9805\uff0c\u9019\u4e9b\u65b9\u6cd5\u90fd\u80fd\u6709\u6548\u5730\u7dad\u8b77\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u5916\u9375\u7d04\u675f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u7ba1\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\u3002\u7121\u8ad6\u662f\u642d\u5efa\u7db2\u7ad9\u9084\u662f\u904b\u884c\u61c9\u7528\u7a0b\u5e8f\uff0c\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u90fd\u80fd\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u5728Oracle\u4e2d\u4ee5\u975e\u9ed8\u8a8d\u65b9\u5f0f\u5275\u5efa\u5916\u9375\uff0c\u63d0\u5347\u6578\u64da\u5b8c\u6574\u6027\u548c\u95dc\u806f\u6027\u7ba1\u7406\u7684\u6280\u5de7\u8207\u65b9\u6cd5\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-96258","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96258","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=96258"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96258\/revisions"}],"predecessor-version":[{"id":96259,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96258\/revisions\/96259"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96258"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96258"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}