{"id":199702,"date":"2025-05-06T08:57:03","date_gmt":"2025-05-06T00:57:03","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199702\/"},"modified":"2025-05-06T08:57:03","modified_gmt":"2025-05-06T00:57:03","slug":"sql%e4%b8%ad%e7%9a%84identity%e5%b1%9e%e6%80%a7%e7%9a%84%e4%bd%9c%e7%94%a8%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199702\/","title":{"rendered":"SQL\u4e2d\u7684identity\u5c5e\u6027\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

SQL\u4e2d\u7684identity\u5c5e\u6027\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f<\/h1>\n

\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\uff0c\u6216\u8005\u662f\u5bf9\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01<\/p>\n

SQL\u4e2d\u7684identity\u662f\u4e00\u4e2a\u5728\u8868\u4e2d\u521b\u5efa\u81ea\u589e\u957f\u5e8f\u5217\u7684\u7279\u6027\u3002\u5f53\u5728\u8868\u4e2d\u5b9a\u4e49\u4e00\u4e2aidentity\u5217\u65f6\uff0c\u6bcf\u6b21\u63d2\u5165\u65b0\u7684\u6570\u636e\u65f6\uff0c\u8be5\u5217\u7684\u503c\u90fd\u4f1a\u81ea\u52a8\u9012\u589e\uff0c\u5e76\u4e14\u4f7f\u7528\u9ed8\u8ba4\u7684\u6b65\u957f\u4e3a1\u3002<\/p>\n

Identity\u7279\u6027\u901a\u5e38\u7528\u4e8e\u5b9a\u4e49\u4e3b\u952e\u5217\uff0c\u4ee5\u786e\u4fdd\u6bcf\u884c\u6570\u636e\u90fd\u5177\u6709\u552f\u4e00\u7684\u6807\u8bc6\u7b26\u3002\u5b83\u53ef\u4ee5\u5728\u521b\u5efa\u8868\u65f6\u4f7f\u7528\u6216\u8005\u5728\u5df2\u5b58\u5728\u7684\u8868\u4e2d\u901a\u8fc7\u4fee\u6539\u5217\u5c5e\u6027\u6765\u6dfb\u52a0\u3002<\/p>\n

\u4e0b\u9762\u662f\u4e00\u4e9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u6765\u6f14\u793a\u5982\u4f55\u4f7f\u7528identity\u7279\u6027\uff1a<\/p>\n

    \n
  1. \u5728\u521b\u5efa\u8868\u65f6\u6dfb\u52a0identity\u5217\uff1a<\/li>\n<\/ol>\n
    CREATE TABLE Persons\n(\n    ID INT IDENTITY(1,1) PRIMARY KEY,\n    FirstName VARCHAR(50),\n    LastName VARCHAR(50)\n)<\/pre>\n
    \u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0cID\u5217\u88ab\u5b9a\u4e49\u4e3aidentity\u5217\uff0c\u5e76\u4e14\u4f7f\u7528\u9ed8\u8ba4\u7684\u521d\u59cb\u503c1\u548c\u6b65\u957f1\u3002\u5b83\u4f5c\u4e3a\u4e3b\u952e\u5217\uff0c\u7528\u4e8e\u552f\u4e00\u6807\u8bc6\u6bcf\u4e2a\u4eba\u3002<\/p>\n
      \n
    1. \u5728\u5df2\u5b58\u5728\u7684\u8868\u4e2d\u6dfb\u52a0identity\u5217\uff1a<\/li>\n<\/ol>\n
      ALTER TABLE Persons\nADD ID INT IDENTITY(1,1) PRIMARY KEY<\/pre>\n
      \u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528ALTER TABLE\u8bed\u53e5\u6765\u5411\u5df2\u5b58\u5728\u7684Persons\u8868\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684identity\u5217ID\uff0c\u5e76\u5c06\u5176\u4f5c\u4e3a\u4e3b\u952e\u5217\u3002<\/p>\n
        \n
      1. \u63d2\u5165\u65b0\u7684\u6570\u636e\u65f6\uff0cidentity\u5217\u7684\u503c\u4f1a\u81ea\u52a8\u9012\u589e\uff1a<\/li>\n<\/ol>\n
        INSERT INTO Persons (FirstName, LastName)\nVALUES ('John', 'Doe')\n\n-- \u6b64\u65f6ID\u5217\u7684\u503c\u4e3a1\n\nINSERT INTO Persons (FirstName, LastName)\nVALUES ('Jane', 'Smith')\n\n-- \u6b64\u65f6ID\u5217\u7684\u503c\u4e3a2<\/pre>\n
        \u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5411Persons\u8868\u4e2d\u63d2\u5165\u4e86\u4e24\u884c\u65b0\u7684\u6570\u636e\u3002\u7531\u4e8eID\u5217\u662fidentity\u5217\uff0c\u6240\u4ee5\u5b83\u7684\u503c\u4f1a\u81ea\u52a8\u9012\u589e\uff0c\u7b2c\u4e00\u6b21\u63d2\u5165\u65f6\u4e3a1\uff0c\u7b2c\u4e8c\u6b21\u63d2\u5165\u65f6\u4e3a2\u3002<\/p>\n
        \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6bcf\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2aidentity\u5217\u3002\u5982\u679c\u8868\u4e2d\u5df2\u7ecf\u6709\u4e00\u4e2aidentity\u5217\uff0c\u4f46\u4f60\u60f3\u5728\u8be5\u8868\u4e2d\u6dfb\u52a0\u53e6\u4e00\u4e2aidentity\u5217\uff0c\u4f60\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u89c6\u56fe\u6765\u5b9e\u73b0\u7c7b\u4f3c\u7684\u6548\u679c\u3002<\/p>\n
        \u603b\u7ed3\u8d77\u6765\uff0cidentity\u662fSQL\u4e2d\u7528\u4e8e\u521b\u5efa\u81ea\u589e\u957f\u5e8f\u5217\u7684\u7279\u6027\u3002\u5b83\u5728\u5b9a\u4e49\u4e3b\u952e\u5217\u65f6\u975e\u5e38\u6709\u7528\uff0c\u53ef\u4ee5\u786e\u4fdd\u6bcf\u6761\u6570\u636e\u90fd\u6709\u552f\u4e00\u6807\u8bc6\u7b26\u3002\u4ee5\u4e0a\u662f\u4e00\u4e9b\u5173\u4e8eidentity\u7684\u5177\u4f53\u4ee3\u7801\u793a\u4f8b\uff0c\u5e0c\u671b\u80fd\u5e2e\u52a9\u4f60\u7406\u89e3\u548c\u4f7f\u7528\u5b83\u3002<\/p>\n
        \u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\u4e3b\u673a\u5b9d\u8d1d\uff01\u66f4\u591a\u5173\u4e8e\u6570\u636e\u5e93\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u3002<\/p>\n
        \n
        \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
        SQL\u4e2d\u7684identity\u5c5e\u6027\u7684...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-199702","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199702","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=199702"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199702\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199702"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199702"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199702"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}