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\u6211\u5011\u5efa\u7acb\u56db\u500b\u8cc7\u6599\u8868\uff1aBook<\/code>, Inventory<\/code>, Customer<\/code>\uff0c\u4ee5\u53caPurchase<\/code>\uff0c\u6bcf\u500b\u8cc7\u6599\u8868\u7686\u5305\u542b\u5176\u5c6c\u6027\u3002\u6211\u5011\u4f7f\u7528[PK]<\/code>\u8207[FK]<\/code>\u8a3b\u89e3\u4f86\u5206\u5225\u6a19\u793a\u4e3b\u9375\u8207\u5916\u9375\u5c6c\u6027\u3002\u6211\u5011\u4e5f\u4f7f\u7528--|><\/code>\u7bad\u982d\u6a19\u793a\u4f86\u8868\u793a\u8cc7\u6599\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002<\/p>\n

\u900f\u904e\u4f7f\u7528\u5be6\u9ad4 ERD\uff0c\u6211\u5011\u53ef\u4ee5\u8996\u89ba\u5316\u8cc7\u6599\u5eab\u7d50\u69cb\u53ca\u5176\u95dc\u806f\uff0c\u9019\u5c0d\u65bc\u8cc7\u6599\u5eab\u8a2d\u8a08\u8207\u6700\u4f73\u5316\u76f8\u7576\u6709\u5e6b\u52a9\u3002<\/p>\n

\"\u66f8\u5e97\u7cfb\u7d71\u5be6\u9ad4<\/p>\n

\u64b0\u5beb SQL \u4ee5\u6839\u64da\u5be6\u9ad4 ERD \u5efa\u7acb\u8cc7\u6599\u5eab<\/h2>\n

\u6b64\u7d50\u69cb\u5305\u542b\u56db\u500b\u8cc7\u6599\u8868\u53ca\u5176\u5c6c\u6027\u8207\u95dc\u806f\uff0c\u9075\u5faa SQL \u8a9e\u8a00\u7684\u8a9e\u6cd5\u3002\u6211\u5011\u4f7f\u7528CREATE TABLE<\/code>\u9673\u8ff0\u5f0f\u4f86\u5b9a\u7fa9\u6bcf\u500b\u8cc7\u6599\u8868\uff0c\u4e26\u6307\u5b9a\u5c6c\u6027\u53ca\u5176\u8cc7\u6599\u985e\u578b\u8207\u7d04\u675f\uff0c\u4f8b\u5982PRIMARY KEY<\/code>\u8207\u5916\u9375<\/code>. \u6211\u5011\u4e5f\u4f7f\u7528\u300cREFERENCES<\/code>\u95dc\u9375\u5b57\u4f86\u8868\u793a\u8cc7\u6599\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002<\/p>\n

(*Visual Paradigm \u87a2\u5e55\u622a\u5716 \u2013 \u5f9e ERD \u7522\u751f\u8cc7\u6599\u5eab<\/strong>)<\/p>\n

\"ER<\/p>\n

\u6b64\u7d50\u69cb\u53ef\u7528\u65bc\u5efa\u7acb\u5be6\u9ad4\u8cc7\u6599\u5eab\u57f7\u884c\u500b\u9ad4\uff0c\u5176\u4e2d\u8cc7\u6599\u53ef\u4f9d\u64da\u5b9a\u7fa9\u7684\u7d50\u69cb\u9032\u884c\u5132\u5b58\u8207\u6aa2\u7d22\u3002<\/p>\n

\n

CREATE TABLE Book (
\nISBN VARCHAR(255) PRIMARY KEY,
\ntitle VARCHAR(255),
\nauthor VARCHAR(255)
\n);<\/p>\n

CREATE TABLE Inventory (
\nISBN VARCHAR(255) PRIMARY KEY REFERENCES Book(ISBN),
\nnumCopies INT
\n);<\/p>\n

CREATE TABLE Customer (
\nid INT PRIMARY KEY,
\nname VARCHAR(255),
\nemail VARCHAR(255)
\n);<\/p>\n

CREATE TABLE Purchase (
\nid INT PRIMARY KEY,
\ncustomerId INT REFERENCES Customer(id),
\nISBN VARCHAR(255) REFERENCES Book(ISBN),
\ndate DATE
\n);<\/p>\n<\/blockquote>\n

\u8cc7\u6599\u5efa\u6a21\u7684\u53e6\u4e00\u7a2e\u65b9\u6cd5\uff1a\u7269\u4ef6\u95dc\u806f\u6620\u5c04<\/h2>\n

ORM\uff08\u7269\u4ef6\u95dc\u806f\u6620\u5c04\uff09\u662f\u4e00\u7a2e\u8cc7\u6599\u5efa\u6a21\u7684\u66ff\u4ee3\u65b9\u6cd5\uff0c\u5141\u8a31\u958b\u767c\u4eba\u54e1\u4f7f\u7528\u7269\u4ef6\u5c0e\u5411\u7a0b\u5f0f\u8a9e\u8a00\u8207\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u4e92\u52d5\uff0c\u800c\u7121\u9700\u64b0\u5beb\u8907\u96dc\u7684 SQL \u67e5\u8a62\u3002\u63db\u53e5\u8a71\u8aaa\uff0cORM \u63d0\u4f9b\u4e86\u4e00\u7a2e\u5728\u8cc7\u6599\u5eab\u7684\u95dc\u806f\u5f0f\u8cc7\u6599\u6a21\u578b\u8207\u7a0b\u5f0f\u8a9e\u8a00\u7684\u7269\u4ef6\u5c0e\u5411\u8cc7\u6599\u6a21\u578b\u4e4b\u9593\u9032\u884c\u6620\u5c04\u7684\u65b9\u5f0f\u3002<\/p>\n

ORM \u6846\u67b6\uff08\u5982 Hibernate\u3001Django ORM \u548c Sequelize\uff09\u63d0\u4f9b\u4e86\u4e00\u5957\u5de5\u5177\u548c API\uff0c\u8b93\u958b\u767c\u4eba\u54e1\u80fd\u5920\u4ee5\u7269\u4ef6\u800c\u975e\u8cc7\u6599\u8868\u8207\u8cc7\u6599\u5217\u7684\u65b9\u5f0f\u64cd\u4f5c\u8cc7\u6599\u5eab\uff0c\u5f9e\u800c\u7c21\u5316\u8cc7\u6599\u5eab\u64cd\u4f5c\u6d41\u7a0b\u3002ORM \u6846\u67b6\u63d0\u4f9b\u4e86\u4e00\u7a2e\u5b9a\u7fa9\u4ee3\u8868\u8cc7\u6599\u5eab\u5be6\u9ad4\u7684\u7269\u4ef6\u985e\u5225\u7684\u65b9\u6cd5\uff0c\u4e26\u5c07\u9019\u4e9b\u985e\u5225\u7684\u5c6c\u6027\u5c0d\u61c9\u5230\u76f8\u61c9\u7684\u8cc7\u6599\u5eab\u6b04\u4f4d\u3002\u6b64\u5916\uff0c\u5b83\u5011\u9084\u63d0\u4f9b\u4ee5\u7269\u4ef6\u5c0e\u5411\u8a9e\u6cd5\u67e5\u8a62\u8cc7\u6599\u5eab\u7684\u65b9\u5f0f\uff0c\u9019\u80fd\u4f7f\u7a0b\u5f0f\u78bc\u66f4\u5177\u53ef\u8b80\u6027\u4e14\u66f4\u6613\u65bc\u7dad\u8b77\u3002<\/p>\n

\"\u7269\u4ef6\u95dc\u806f\u5f0f\u6620\u5c04\uff08ORM\uff09\u7bc4\u4f8b\"<\/p>\n

\u4f7f\u7528 ORM \u53ef\u4ee5\u900f\u904e\u62bd\u8c61\u5316\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u7684\u8a31\u591a\u8907\u96dc\u6027\uff0c\u4e26\u5728\u7269\u4ef6\u5c0e\u5411\u7a0b\u5f0f\u8a9e\u8a00\u4e2d\u63d0\u4f9b\u66f4\u81ea\u7136\u7684\u65b9\u5f0f\u4f86\u64cd\u4f5c\u8cc7\u6599\uff0c\u5f9e\u800c\u7c21\u5316\u8cc7\u6599\u5efa\u6a21\u6d41\u7a0b\u3002ORM \u4e5f\u80fd\u8b93\u5728\u4e0d\u540c\u8cc7\u6599\u5eab\u6216\u8cc7\u6599\u5eab\u7cfb\u7d71\u4e4b\u9593\u5207\u63db\u8b8a\u5f97\u66f4\u52a0\u5bb9\u6613\uff0c\u56e0\u70ba ORM \u6846\u67b6\u6703\u8655\u7406\u5927\u90e8\u5206\u5e95\u5c64\u8207\u8cc7\u6599\u5eab\u76f8\u95dc\u7684\u7d30\u7bc0\u3002<\/p>\n

\u7136\u800c\uff0c\u5fc5\u9808\u6ce8\u610f\u7684\u662f\uff0cORM \u4e26\u975e\u5728\u6240\u6709\u60c5\u6cc1\u4e0b\u90fd\u662f\u6700\u4f73\u89e3\u6c7a\u65b9\u6848\u3002\u4f7f\u7528 ORM \u53ef\u80fd\u6703\u4f34\u96a8\u6548\u80fd\u8207\u53ef\u64f4\u5c55\u6027\u7684\u6b0a\u8861\u53d6\u6368\uff0c\u4e14\u5b83\u672a\u5fc5\u9069\u5408\u67d0\u4e9b\u985e\u578b\u7684\u61c9\u7528\u7a0b\u5f0f\u6216\u8cc7\u6599\u6a21\u578b\u3002\u6700\u7d42\uff0c\u9078\u64c7\u4f7f\u7528 ORM \u6216\u50b3\u7d71\u8cc7\u6599\u5efa\u6a21\u6280\u8853\uff0c\u5c07\u53d6\u6c7a\u65bc\u5c08\u6848\u7684\u5177\u9ad4\u9700\u6c42\uff0c\u4ee5\u53ca\u958b\u767c\u5718\u968a\u7684\u5c08\u696d\u77e5\u8b58\u8207\u504f\u597d\u3002<\/p>\n

\u7d50\u8ad6<\/h2>\n

\u8cc7\u6599\u5efa\u6a21\u662f\u7269\u4ef6\u5c0e\u5411\u8a2d\u8a08\u4e2d\u7684\u95dc\u9375\u6b65\u9a5f\uff0c\u56e0\u70ba\u5b83\u80fd\u8b93\u6211\u5011\u4ee5\u7d50\u69cb\u5316\u7684\u65b9\u5f0f\u5448\u73fe\u8cc7\u6599\u8207\u5be6\u9ad4\u4e4b\u9593\u7684\u95dc\u4fc2\u3002\u900f\u904e\u4f7f\u7528\u5be6\u9ad4\u95dc\u4fc2\u5716\uff08ERD\uff09\u8207\u985e\u5225\u5716\u7b49\u5de5\u5177\uff0c\u6211\u5011\u53ef\u4ee5\u8996\u89ba\u5316\u8cc7\u6599\u7d50\u69cb\u53ca\u5176\u95dc\u4fc2\uff0c\u9019\u6709\u52a9\u65bc\u8a2d\u8a08\u9ad8\u6548\u4e14\u6613\u65bc\u7dad\u8b77\u7684\u8edf\u9ad4\u7cfb\u7d71\u3002<\/p>\n

\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c55\u793a\u4e86\u5982\u4f55\u5efa\u7acb\u5be6\u9ad4 ERD\uff0c\u4e26\u64da\u6b64\u884d\u751f\u51fa\u985e\u5225\u5716\u3002\u6211\u5011\u4e5f\u6839\u64da\u5be6\u9ad4 ERD \u7522\u751f\u4e86\u8cc7\u6599\u5eab\u7d50\u69cb\uff0c\u53ef\u7528\u65bc\u5efa\u7acb\u5be6\u9ad4\u8cc7\u6599\u5eab\u57f7\u884c\u500b\u9ad4\u3002\u9075\u5faa\u9019\u4e9b\u6b65\u9a5f\uff0c\u6211\u5011\u53ef\u4ee5\u5efa\u7acb\u7d50\u69cb\u826f\u597d\u7684\u8cc7\u6599\u5eab\u7d50\u69cb\uff0c\u4ee5\u6e05\u6670\u7c21\u6f54\u7684\u65b9\u5f0f\u5448\u73fe\u8cc7\u6599\u5be6\u9ad4\u53ca\u5176\u95dc\u4fc2\u3002<\/p>\n

\u7e3d\u9ad4\u800c\u8a00\uff0c\u8cc7\u6599\u5efa\u6a21\u662f\u8edf\u9ad4\u958b\u767c\u7684\u91cd\u8981\u9762\u5411\uff0c\u900f\u904e\u4f7f\u7528 ERD \u8207\u985e\u5225\u5716\u7b49\u5de5\u5177\uff0c\u6211\u5011\u53ef\u4ee5\u8a2d\u8a08\u51fa\u66f4\u512a\u7570\u7684\u7cfb\u7d71\uff0c\u4f7f\u5176\u66f4\u6613\u65bc\u7406\u89e3\u3001\u7dad\u8b77\uff0c\u4e26\u80fd\u96a8\u8457\u6642\u9593\u63a8\u79fb\u6301\u7e8c\u6f14\u9032\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u8cc7\u6599\u5efa\u6a21\u8207\u7269\u4ef6\u5c0e\u5411\u8a2d\u8a08 \u8cc7\u6599\u5efa\u6a21\u8207\u7269\u4ef6\u5c0e\u5411\u8a2d\u8a08\u662f\u8edf\u9ad4\u5de5\u7a0b\u7684\u5169\u500b\u95dc\u9375\u7d44\u6210\u90e8\u5206\u3002\u8cc7\u6599\u5efa\u6a21\u65e8\u5728\u8868\u793a\u8cc7\u6599\u8207\u5be6\u9ad4\u4e4b\u9593\u7684\u95dc\u4fc2\uff0c\u800c\u7269\u4ef6\u5c0e\u5411\u8a2d\u8a08\u5247\u8457\u91cd\u65bc\u5efa\u7acb\u5c01\u88dd\u8cc7\u6599\u8207\u884c\u70ba\u7684\u8edf\u9ad4\u7269\u4ef6\u3002\u9019\u5169\u500b\u6982\u5ff5\u4e4b\u9593\u7684\u95dc\u4fc2\u5c0d\u65bc\u5efa\u69cb\u7a69\u5065\u4e14\u53ef\u7dad\u8b77\u7684\u8edf\u9ad4\u7cfb\u7d71\u81f3\u95dc\u91cd\u8981\u3002 \u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0e\u70ba\u4f55\u8cc7\u6599\u5efa\u6a21\u5c0d\u7269\u4ef6\u5c0e\u5411\u8a2d\u8a08\u6709\u6240\u52a9\u76ca\u3001\u5be6\u9ad4\u8207\u5be6\u9ad4\u95dc\u4fc2\u5716\uff08ERD\uff09\u5982\u4f55\u8207\u985e\u5225\u5716\u4e2d\u7684\u7269\u4ef6\u76f8\u95dc\u806f\uff0c\u4ee5\u53ca\u8cc7\u6599\u5efa\u6a21\u5982\u4f55\u5354\u52a9\u60a8\u767c\u5c55\u985e\u5225\u5716\u3002 \u5be6\u9ad4\u95dc\u4fc2\u5716\u8207\u985e\u5225\u5716\u5728\u8edf\u9ad4\u958b\u767c\u4e2d\u7684\u4e92\u88dc\u89d2\u8272 \u5be6\u9ad4\u95dc\u4fc2\u5716\uff08ERD\uff09\u8207\u985e\u5225\u5716\u90fd\u662f\u8edf\u9ad4\u958b\u767c\u4e2d\u7684\u91cd\u8981\u5de5\u5177\uff0c\u4f46\u5b83\u5011\u670d\u52d9\u4e0d\u540c\u7684\u76ee\u7684\uff0c\u4e26\u4ee3\u8868\u7cfb\u7d71\u8a2d\u8a08\u7684\u4e0d\u540c\u9762\u5411\u3002 ERD \u7528\u65bc\u4ee5\u8996\u89ba\u65b9\u5f0f\u8868\u793a\u8cc7\u6599\u5be6\u9ad4\u53ca\u5176\u95dc\u4fc2\uff0c\u901a\u5e38\u7528\u65bc\u8edf\u9ad4\u958b\u767c\u7684\u65e9\u671f\u968e\u6bb5\u4ee5\u5efa\u7acb\u8cc7\u6599\u7d50\u69cb\u6a21\u578b\u3002ERD \u986f\u793a\u4e0d\u540c\u985e\u578b\u7684\u5be6\u9ad4\u53ca\u5176\u76f8\u4e92\u95dc\u4fc2\uff0c\u4e26\u53ef\u5305\u542b\u95dc\u65bc\u5c6c\u6027\u3001\u4e3b\u9375\u8207\u5916\u9375\uff0c\u4ee5\u53ca\u57fa\u6578\uff08cardinality\uff09\u7684\u8cc7\u8a0a\u3002 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