{"id":215,"date":"2025-05-27T18:44:14","date_gmt":"2025-05-27T10:44:14","guid":{"rendered":"https:\/\/zd1269878.noblogs.org\/?p=215"},"modified":"2025-10-21T10:31:42","modified_gmt":"2025-10-21T02:31:42","slug":"%e6%95%b0%e6%8d%ae%e5%ba%93e-r%e5%9b%be","status":"publish","type":"post","link":"https:\/\/zd1269878.noblogs.org\/en-US\/post\/2025\/05\/27\/%e6%95%b0%e6%8d%ae%e5%ba%93e-r%e5%9b%be\/","title":{"rendered":"\u6570\u636e\u5e93E-R\u56fe"},"content":{"rendered":"\n

1.E-R\u56fe\u7b80\u4ecb\uff08\u4ec0\u4e48\u662fE-R\u56fe\uff09
E-R\u6a21\u578b\uff08Entity-Relationship Model\uff09\u662f\u4e00\u79cd\u7528\u4e8e\u6570\u636e\u5e93\u8bbe\u8ba1\u7684\u6982\u5ff5\u6a21\u578b\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u63cf\u8ff0\u73b0\u5b9e\u4e16\u754c\u4e2d\u6570\u636e
\u7ec4\u7ec7\u548c\u5173\u8054\u7684\u56fe\u5f62\u5316\u65b9\u6cd5\uff0c\u7528\u4e8e\u8868\u793a\u5b9e\u4f53\u3001\u5c5e\u6027\u548c\u8054\u7cfb\u4e4b\u95f4\u7684\u5173\u7cfb\u3002
2.\u4e3a\u4ec0\u4e48\u8981\u5f15\u5165E-R\u56fe\uff1f
\u4f7f\u7528E-R\u6a21\u578b\u6709\u4ee5\u4e0b\u51e0\u4e2a\u4e3b\u8981\u539f\u56e0\uff1a<\/p>\n\n\n\n

    \n
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    \u7cfb\u62bd\u8c61\u6210\u56fe\u5f62\u5316\u7b26\u53f7\uff0c\u53ef\u4ee5\u66f4\u597d\u5730\u6355\u6349\u548c\u8868\u793a\u6570\u636e\u4e4b\u95f4\u7684\u5173\u7cfb\u548c\u7ed3\u6784\u3002<\/li>\n\n\n\n
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    \u7cfb\u3001\u5c5e\u6027\u7684\u7279\u5f81\u4ee5\u53ca\u5b83\u4eec\u4e4b\u95f4\u7684\u8fde\u63a5\u65b9\u5f0f\u3002<\/li>\n\n\n\n
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    \u63d2\u5165\u3001\u66f4\u65b0\u548c\u5220\u9664\u65f6\u4fdd\u6301\u4e00\u81f4\u6027\u548c\u6b63\u786e\u6027\u3002<\/li>\n\n\n\n
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    \u63a5\u65b9\u5f0f\uff0c\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u548c\u54cd\u5e94\u65f6\u95f4\u3002E-R\u6a21\u578b\u8fd8\u53ef\u4ee5\u6307\u5bfc\u7d22\u5f15\u7684\u521b\u5efa\uff0c\u4ee5\u652f\u6301\u5e38\u89c1\u7684\u67e5\u8be2\u64cd\u4f5c\u3002
    \u603b\u7684\u6765\u8bf4\uff0cE-R\u6a21\u578b\u63d0\u4f9b\u4e86\u4e00\u79cd\u76f4\u89c2\u548c\u89c4\u8303\u7684\u65b9\u6cd5\u6765\u63cf\u8ff0\u548c\u8bbe\u8ba1\u6570\u636e\u5e93\u3002\u5b83\u6709\u52a9\u4e8e\u63d0\u9ad8\u6570\u636e\u5e93\u8bbe\u8ba1\u7684\u8d28\u91cf\u3001\u6570\u636e
    \u7684\u5b8c\u6574\u6027\u548c\u67e5\u8be2\u7684\u6027\u80fd\uff0c\u4ece\u800c\u63d0\u5347\u6574\u4e2a\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u6548\u7387\u548c\u53ef\u9760\u6027\u3002
    3.E-R\u56fe\u7684\u6784\u6210<\/li>\n\n\n\n
  5. \u5b9e\u4f53\uff08Entity\uff09\uff1a\u5b9e\u4f53\u8868\u793a\u73b0\u5b9e\u4e16\u754c\u4e2d\u7684\u4e00\u4e2a\u72ec\u7acb\u5bf9\u8c61\uff0c\u53ef\u4ee5\u662f\u4eba\u3001\u7269\u3001\u5730\u70b9\u3001\u6982\u5ff5\u7b49\u3002\u5728E-R\u56fe\u4e2d\uff0c\u5b9e
    \u4f53\u7528\u77e9\u5f62\u6846\u8868\u793a\uff0c\u6846\u5185\u5199\u4e0a\u5b9e\u4f53\u7684\u540d\u79f0\u3002<\/li>\n\n\n\n
  6. \u5c5e\u6027\uff08Attribute\uff09\uff1a\u5c5e\u6027\u662f\u63cf\u8ff0\u5b9e\u4f53\u7279\u5f81\u7684\u4fe1\u606f\u3002\u6bcf\u4e2a\u5b9e\u4f53\u53ef\u4ee5\u6709\u591a\u4e2a\u5c5e\u6027\uff0c\u4f8b\u5982\u4e00\u4e2a\u4eba\u5b9e\u4f53\u53ef\u4ee5\u6709\u59d3
    \u540d\u3001\u5e74\u9f84\u3001\u6027\u522b\u7b49\u5c5e\u6027\u3002\u5c5e\u6027\u4ee5\u692d\u5706\u5f62\u72b6\u8868\u793a\uff0c\u5e76\u4e0e\u76f8\u5e94\u7684\u5b9e\u4f53\u76f8\u8fde\u3002\u5176\u4e2d\u80fd\u591f\u552f\u4e00\u6807\u8bc6\u5b9e\u4f53\u7684\u5c5e\u6027\u79f0\u4e3a
    \u4e3b\u952e\u3002<\/li>\n\n\n\n
  7. \u5173\u7cfb\uff08Relationship\uff09\uff1a\u5173\u7cfb\u8868\u793a\u5b9e\u4f53\u4e4b\u95f4\u7684\u76f8\u4e92\u4f5c\u7528\u6216\u8054\u7cfb\u3002\u5173\u7cfb\u53ef\u4ee5\u662f\u4e00\u5bf9\u4e00\u3001\u4e00\u5bf9\u591a\u6216\u591a\u5bf9\u591a\u7684\u3002
    \u5728E-R\u56fe\u4e2d\uff0c\u5173\u7cfb\u7528\u83f1\u5f62\u8868\u793a\uff0c\u5e76\u4e0e\u76f8\u5173\u7684\u5b9e\u4f53\u76f8\u8fde\u3002\u5173\u7cfb\u8fd8\u53ef\u4ee5\u5177\u6709\u5c5e\u6027\uff0c\u7528\u4e8e\u63cf\u8ff0\u4e0e\u5173\u7cfb\u76f8\u5173\u7684\u4fe1
    \u606f\u3002<\/li>\n\n\n\n
  8. \u4e3b\u952e\uff08Primary Key\uff09\uff1a\u7528\u4e8e\u552f\u4e00\u6807\u8bc6\u5b9e\u4f53\u7684\u5c5e\u6027\uff0c\u901a\u5e38\u5728\u5b9e\u4f53\u6846\u5185\u7528\u4e0b\u5212\u7ebf\u6216\u52a0\u7c97\u8868\u793a\u3002\u4e3b\u952e\u5c5e\u6027\u7684\u503c
    \u5728\u6574\u4e2a\u5b9e\u4f53\u96c6\u5408\u4e2d\u5fc5\u987b\u662f\u552f\u4e00\u7684\uff0c\u7528\u4e8e\u533a\u5206\u4e0d\u540c\u7684\u5b9e\u4f53\u3002
    \u5728 E-R \u56fe\u4e2d\uff0c\u6839\u636e\u5b9e\u4f53\u4e4b\u95f4\u7684\u8fde\u63a5\u65b9\u5f0f\u548c\u5173\u7cfb\u7c7b\u578b\uff0c\u5173\u8054\u5173\u7cfb\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u51e0\u79cd\u7c7b\u578b\uff1a<\/li>\n\n\n\n
  9. \u4e00\u5bf9\u4e00\uff08One-to-One\uff09\u5173\u8054\uff1a\u4e00\u4e2a\u5b9e\u4f53\u5b9e\u4f8b\u4e0e\u53e6\u4e00\u4e2a\u5b9e\u4f53\u5b9e\u4f8b\u4e4b\u95f4\u5b58\u5728\u552f\u4e00\u7684\u5173\u8054\u5173\u7cfb\u3002\u8fd9\u79cd\u5173\u7cfb\u8868\u793a\u4e3a\u4e00\u4e2a\u5b9e
    \u4f53\u7684\u4e00\u4e2a\u5b9e\u4f8b\u4e0e\u53e6\u4e00\u4e2a\u5b9e\u4f53\u7684\u4e00\u4e2a\u5b9e\u4f8b\u76f8\u8fde\u63a5\u3002<\/li>\n\n\n\n
  10. \u4e00\u5bf9\u591a\uff08One-to-Many\uff09\u5173\u8054\uff1a\u4e00\u4e2a\u5b9e\u4f53\u5b9e\u4f8b\u4e0e\u53e6\u4e00\u4e2a\u5b9e\u4f53\u5b9e\u4f8b\u4e4b\u95f4\u5b58\u5728\u4e00\u5bf9\u591a\u7684\u5173\u8054\u5173\u7cfb\u3002\u8fd9\u79cd\u5173\u7cfb\u8868\u793a\u4e3a\u4e00\u4e2a
    \u5b9e\u4f53\u7684\u4e00\u4e2a\u5b9e\u4f8b\u4e0e\u53e6\u4e00\u4e2a\u5b9e\u4f53\u7684\u591a\u4e2a\u5b9e\u4f8b\u76f8\u8fde\u63a5\u3002<\/li>\n\n\n\n
  11. \u591a\u5bf9\u591a\uff08Many-to-Many\uff09\u5173\u8054\uff1a\u591a\u4e2a\u5b9e\u4f53\u5b9e\u4f8b\u4e0e\u53e6\u4e00\u4e2a\u5b9e\u4f53\u5b9e\u4f8b\u4e4b\u95f4\u5b58\u5728\u591a\u5bf9\u591a\u7684\u5173\u8054\u5173\u7cfb\u3002\u8fd9\u79cd\u5173\u7cfb\u8868\u793a\u4e3a\u4e00
    \u4e2a\u5b9e\u4f53\u7684\u591a\u4e2a\u5b9e\u4f8b\u4e0e\u53e6\u4e00\u4e2a\u5b9e\u4f53\u7684\u591a\u4e2a\u5b9e\u4f8b\u76f8\u8fde\u63a5\u3002
    \u6211\u4eec\u6765\u7528\u56fe\u7247\u4e3e\u4e2a\u4f8b\u5b50\uff1a
    1.\u4e00\u5bf9\u4e00
    2.\u4e00\u5bf9\u591a
    3.\u591a\u5bf9\u591a
    \u5728E-R\u56fe\u4e2d\uff0c\u5173\u7cfb\u53ef\u4ee5\u5177\u6709\u4e0e\u4e4b\u76f8\u5173\u7684\u5c5e\u6027\uff0c\u7528\u4e8e\u63cf\u8ff0\u4e0e\u8be5\u5173\u7cfb\u76f8\u5173\u7684\u4fe1\u606f\u3002\u8fd9\u4e9b\u5c5e\u6027\u53ef\u4ee5\u63d0\u4f9b\u66f4\u8be6\u7ec6\u7684\u5173\u7cfb\u63cf
    \u8ff0\uff0c\u4ee5\u8865\u5145\u5173\u7cfb\u672c\u8eab\u65e0\u6cd5\u5b8c\u5168\u8868\u8fbe\u7684\u4fe1\u606f\u3002 \u6bd4\u5982\u804c\u5de5\u4e0e\u90e8\u95e8\u7684\u5de5\u4f5c\u5173\u7cfb\uff0c\u8fd9\u4e2a\u5173\u7cfb\u53ef\u4ee5\u5177\u6709\u5c5e\u6027\uff0c\u5982\u5de5\u4f5c\u65f6
    \u95f4\u3001\u5de5\u4f5c\u6027\u8d28\u3002\u901a\u8fc7\u5173\u7cfb\u7684\u5c5e\u6027\u4ee5\u4fbf\u4e8e\u66f4\u597d\u7684\u63cf\u8ff0\u804c\u5de5\u5728\u90e8\u95e8\u4e2d\u7684\u5de5\u4f5c\u60c5\u51b5\u3002
    \u8fd9\u4e09\u4e2a\u90e8\u5206\u662f\u6784\u6210E-R\u56fe\u6700\u5173\u952e\u7684\u90e8\u5206\uff0c\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u4f8b\u5b50\u6765\u52a0\u6df1\u5370\u8c61\uff1a
    \u8ba9\u6211\u4eec\u6765\u8bbe\u8ba1\u4e00\u4e2a\u7b80\u5355\u7684 E-R \u56fe\u6765\u8868\u793a\u5b66\u751f\u548c\u8bfe\u7a0b\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u5047\u8bbe\u6211\u4eec\u6709\u4e24\u4e2a\u5b9e\u4f53\uff1a\u5b66\u751f\uff08Student\uff09\u548c\u8bfe\u7a0b
    \uff08Course\uff09\u3002\u4e00\u4e2a\u5b66\u751f\u53ef\u4ee5\u6ce8\u518c\u591a\u95e8\u8bfe\u7a0b\uff0c\u800c\u4e00\u95e8\u8bfe\u7a0b\u53ef\u4ee5\u6709\u591a\u540d\u5b66\u751f\u3002
    \u8bbe\u8ba1\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/li>\n\n\n\n
  12. \u786e\u5b9a\u5b9e\u4f53\uff08Entities\uff09\uff1a<\/li>\n\n\n\n
  13. \u5b66\u751f\uff08Student\uff09\uff1a\u5c5e\u6027\u5305\u62ec\u5b66\u751fID\uff08Student ID\uff09\u3001\u59d3\u540d\uff08Name\uff09\u3001\u5e74\u7ea7\uff08Grade\uff09\u7b49\u3002<\/li>\n\n\n\n
  14. \u8bfe\u7a0b\uff08Course\uff09\uff1a\u5c5e\u6027\u5305\u62ec\u8bfe\u7a0bID\uff08Course ID\uff09\u3001\u8bfe\u7a0b\u540d\u79f0\uff08Course Name\uff09\u3001\u5b66\u5206\uff08Credit\uff09\u7b49\u3002<\/li>\n\n\n\n
  15. \u786e\u5b9a\u5173\u7cfb\uff08Relationship\uff09\uff1a<\/li>\n\n\n\n
  16. \u6ce8\u518c\uff08Enrollment\uff09\uff1a\u5b66\u751f\u548c\u8bfe\u7a0b\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u8fd9\u662f\u4e00\u4e2a\u591a\u5bf9\u591a\u7684\u5173\u7cfb\uff0c\u56e0\u4e3a\u4e00\u4e2a\u5b66\u751f\u53ef\u4ee5\u6ce8\u518c\u591a\u95e8\u8bfe\u7a0b\uff0c\u800c\u4e00
    \u95e8\u8bfe\u7a0b\u53ef\u4ee5\u6709\u591a\u540d\u5b66\u751f\u3002\u6b64\u5173\u7cfb\u53ef\u4ee5\u5177\u6709\u5c5e\u6027\uff0c\u5982\u9009\u8bfe\u65e5\u671f\uff08Enrollment Date\uff09\u3002<\/li>\n\n\n\n
  17. \u786e\u5b9a\u4e3b\u952e\uff08Primary Key\uff09\uff1a<\/li>\n\n\n\n
  18. \u5b66\u751f\u5b9e\u4f53\u7684\u4e3b\u952e\u4e3a\u5b66\u751fID\uff08Student ID\uff09\u3002<\/li>\n\n\n\n
  19. \u8bfe\u7a0b\u5b9e\u4f53\u7684\u4e3b\u952e\u4e3a\u8bfe\u7a0bID\uff08Course ID\uff09\u3002
    E-R\u56fe\u5982\u4e0b\uff1a
    4.E-R\u56fe\u8fdb\u9636
    \u606d\u559c\u4f60\uff01\u73b0\u5728\u4f60\u5e94\u8be5\u5df2\u7ecf\u61c2\u5f97\u5982\u4f55\u753b\u4e00\u4e2a\u7b80\u5355\u7684E-R\u56fe\u4e86\uff0c\u73b0\u5728\u6211\u4eec\u8981\u8fdb\u4e00\u6b65\u5b66\u4e60E-R\u56fe\u4e2d\u7684\u90e8\u5206\u7ec6\u8282\u3002
    4.1\u5f31\u5b9e\u4f53
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