{"id":199653,"date":"2025-05-06T08:06:32","date_gmt":"2025-05-06T00:06:32","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199653\/"},"modified":"2025-05-06T08:06:32","modified_gmt":"2025-05-06T00:06:32","slug":"sql%e4%b8%ad%e7%9a%84identity%e6%98%af%e4%b8%80%e7%a7%8d%e4%bb%80%e4%b9%88%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199653\/","title":{"rendered":"SQL\u4e2d\u7684IDENTITY\u662f\u4e00\u79cd\u4ec0\u4e48\u6570\u636e\u7c7b\u578b\uff1f"},"content":{"rendered":"

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

SQL\u4e2d\u7684IDENTITY\u662f\u4e00\u79cd\u4ec0\u4e48\u6570\u636e\u7c7b\u578b\uff1f<\/h1>\n

\u5077\u5077\u52aa\u529b\uff0c\u6084\u65e0\u58f0\u606f\u5730\u53d8\u5f3a\uff0c\u7136\u540e\u60ca\u8273\u6240\u6709\u4eba\uff01\u54c8\u54c8\uff0c\u5c0f\u4f19\u4f34\u4eec\u53c8\u6765\u5b66\u4e60\u5566~\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4f1a\u8bb2\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u4e0d\u77e5\u9053\u5927\u5bb6\u5bf9\u5176\u90fd\u6709\u591a\u5c11\u4e86\u89e3\uff0c\u4e0b\u9762\u6211\u4eec\u5c31\u4e00\u8d77\u6765\u770b\u4e00\u5427\uff01\u5f53\u7136\uff0c\u975e\u5e38\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u8bc4\u8bba\uff0c\u7ed9\u51fa\u5408\u7406\u7684\u5efa\u8bae\uff0c\u6211\u4eec\u4e00\u8d77\u5b66\u4e60\uff0c\u4e00\u8d77\u8fdb\u6b65\uff01<\/p>\n

SQL\u4e2d\u7684Identity\u662f\u4ec0\u4e48\uff0c\u9700\u8981\u5177\u4f53\u4ee3\u7801\u793a\u4f8b<\/p>\n

\u5728SQL\u4e2d\uff0cIdentity\u662f\u4e00\u79cd\u7528\u4e8e\u751f\u6210\u81ea\u589e\u6570\u5b57\u7684\u7279\u6b8a\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u5e38\u7528\u4e8e\u552f\u4e00\u6807\u8bc6\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u6570\u636e\u3002Identity\u5217\u901a\u5e38\u4e0e\u4e3b\u952e\u5217\u914d\u5408\u4f7f\u7528\uff0c\u53ef\u4ee5\u786e\u4fdd\u6bcf\u6761\u8bb0\u5f55\u90fd\u6709\u4e00\u4e2a\u72ec\u4e00\u65e0\u4e8c\u7684\u6807\u8bc6\u7b26\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecdIdentity\u7684\u4f7f\u7528\u65b9\u5f0f\u4ee5\u53ca\u4e00\u4e9b\u5b9e\u9645\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

    \n
  1. Identity\u7684\u57fa\u672c\u4f7f\u7528\u65b9\u5f0f<\/li>\n<\/ol>\n

    \u5728\u521b\u5efa\u8868\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528Identity\u5c5e\u6027\u6765\u6307\u5b9a\u67d0\u5217\u4f5c\u4e3a\u81ea\u589e\u5217\u3002\u901a\u5e38\uff0cIdentity\u5217\u4f1a\u548c\u4e00\u4e2a\u6574\u6570\u7c7b\u578b\uff08\u5982INT\u3001BIGINT\u7b49\uff09\u4e00\u8d77\u4f7f\u7528\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u521b\u5efa\u8868\u65f6\u4f7f\u7528Identity\u7684\u4f8b\u5b50\uff1a<\/p>\n

    CREATE TABLE [dbo].[Customers]  (\n   [CustomerID] INT IDENTITY(1,1) PRIMARY KEY,\n   [CustomerName] NVARCHAR(50) NOT NULL,\n   [ContactName] NVARCHAR(50) NOT NULL,\n   [Address] NVARCHAR(100) NULL\n);<\/pre>\n
    \u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cCustomerID\u5217\u88ab\u6307\u5b9a\u4e3aIdentity\u5217\uff0c\u6bcf\u6b21\u63d2\u5165\u6570\u636e\u65f6\uff0c\u5b83\u4f1a\u81ea\u52a8\u751f\u6210\u4e00\u4e2a\u552f\u4e00\u7684\u81ea\u589e\u6570\u5b57\u4f5c\u4e3a\u6807\u8bc6\u3002<\/p>\n
      \n
    1. Identity\u7684\u5c5e\u6027<\/li>\n<\/ol>\n
      Identity\u5217\u6709\u4e24\u4e2a\u91cd\u8981\u7684\u5c5e\u6027\uff1aSeed\uff08\u79cd\u5b50\uff09\u548cIncrement\uff08\u589e\u91cf\uff09\u3002<\/p>\n
      Seed\u6307\u5b9a\u4e86Identity\u5217\u7684\u8d77\u59cb\u503c\uff0c\u9ed8\u8ba4\u4e3a1\u3002\u5728\u4e0a\u8ff0\u7684\u4f8b\u5b50\u4e2d\uff0cSeed\u503c\u4e3a1\uff0c\u8868\u793a\u7b2c\u4e00\u884c\u6570\u636e\u7684CustomerID\u4e3a1\uff0c\u7b2c\u4e8c\u884c\u6570\u636e\u7684CustomerID\u4e3a2\uff0c\u4ee5\u6b64\u7c7b\u63a8\u3002<\/p>\n
      Increment\u6307\u5b9a\u4e86Identity\u503c\u7684\u589e\u957f\u6b65\u957f\uff0c\u9ed8\u8ba4\u4e3a1\u3002\u5728\u4e0a\u8ff0\u7684\u4f8b\u5b50\u4e2d\uff0cIncrement\u503c\u4e3a1\uff0c\u8868\u793a\u6bcf\u6b21\u63d2\u5165\u65b0\u7684\u6570\u636e\u65f6\uff0cIdentity\u503c\u4f1a\u81ea\u52a8\u589e\u52a01\u3002\u4f46\u662f\uff0c\u4f60\u4e5f\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539Increment\u503c\u6765\u66f4\u6539\u589e\u957f\u6b65\u957f\u3002<\/p>\n
        \n
      1. \u4f7f\u7528Identity\u63d2\u5165\u6570\u636e<\/li>\n<\/ol>\n
        \u4f7f\u7528Identity\u5217\u63d2\u5165\u6570\u636e\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u4e0d\u5305\u542bIdentity\u5217\u7684\u503c\u5373\u53ef\u3002\u63d2\u5165\u6570\u636e\u65f6\uff0c\u6570\u636e\u5e93\u4f1a\u81ea\u52a8\u4e3aIdentity\u5217\u751f\u6210\u552f\u4e00\u7684\u503c\u3002\u4e0b\u9762\u7684\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u63d2\u5165\u6570\u636e\u5230Identity\u5217\uff1a<\/p>\n
        INSERT INTO Customers (CustomerName, ContactName, Address)\nVALUES ('ABC Company', 'John Smith', '123 Main Street');\n\nINSERT INTO Customers (CustomerName, ContactName, Address)\nVALUES ('XYZ Inc', 'Jane Doe', '456 Maple Avenue');<\/pre>\n
        \u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u53ea\u63d2\u5165\u4e86CustomerName\u3001ContactName\u548cAddress\u5217\u7684\u503c\uff0c\u800c\u672a\u6307\u5b9aCustomerID\u7684\u503c\u3002\u6570\u636e\u5e93\u4f1a\u81ea\u52a8\u4e3aCustomerID\u751f\u6210\u552f\u4e00\u7684\u503c\u3002<\/p>\n
          \n
        1. \u83b7\u53d6Identity\u7684\u503c<\/li>\n<\/ol>\n
          \u6709\u65f6\u5019\uff0c\u6211\u4eec\u9700\u8981\u83b7\u53d6\u521a\u521a\u63d2\u5165\u6570\u636e\u7684Identity\u503c\u3002\u5728SQL Server\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528SCOPE_IDENTITY()\u51fd\u6570\u6765\u83b7\u53d6\u6700\u8fd1\u4e00\u6b21\u63d2\u5165\u6570\u636e\u7684Identity\u503c\u3002\u4e0b\u9762\u7684\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528SCOPE_IDENTITY()\u51fd\u6570\uff1a<\/p>\n
          INSERT INTO Customers (CustomerName, ContactName, Address)\nVALUES ('ABC Company', 'John Smith', '123 Main Street');\n\nSELECT SCOPE_IDENTITY() AS LastID;<\/pre>\n
          \u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u63d2\u5165\u4e86\u4e00\u6761\u65b0\u7684\u6570\u636e\uff0c\u5e76\u4f7f\u7528SELECT\u8bed\u53e5\u83b7\u53d6\u4e86\u6700\u8fd1\u63d2\u5165\u6570\u636e\u7684Identity\u503c\uff0c\u4fdd\u5b58\u5728LastID\u5b57\u6bb5\u4e2d\u3002<\/p>\n
            \n
          1. \u81ea\u5b9a\u4e49Identity\u5217<\/li>\n<\/ol>\n
            \u6709\u65f6\u5019\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u81ea\u5b9a\u4e49Identity\u5217\u7684\u8d77\u59cb\u503c\u3002SQL Server\u5141\u8bb8\u6211\u4eec\u901a\u8fc7DBCC CHECKIDENT\u8bed\u53e5\u6765\u4fee\u6539Identity\u5217\u7684\u5f53\u524d\u503c\u3002\u4e0b\u9762\u7684\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528DBCC CHECKIDENT\u8bed\u53e5\uff1a<\/p>\n
            DBCC CHECKIDENT ('Customers', RESEED, 100);<\/pre>\n
            \u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5c06Customers\u8868\u7684Identity\u5217\u7684\u5f53\u524d\u503c\u91cd\u8bbe\u4e3a100\u3002\u4e0b\u4e00\u6b21\u63d2\u5165\u6570\u636e\u65f6\uff0cIdentity\u503c\u5c06\u4ece101\u5f00\u59cb\u81ea\u589e\u3002<\/p>\n
            \u603b\u7ed3\uff1a<\/p>\n
            Identity\u662fSQL\u4e2d\u4e00\u79cd\u5e38\u7528\u7684\u81ea\u589e\u6807\u8bc6\u7b26\uff0c\u7528\u4e8e\u6807\u8bc6\u8868\u4e2d\u6bcf\u4e00\u884c\u6570\u636e\u7684\u552f\u4e00\u6027\u3002\u5728\u521b\u5efa\u8868\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528Identity\u5c5e\u6027\u6765\u6307\u5b9a\u67d0\u5217\u4e3aIdentity\u5217\u3002\u63d2\u5165\u6570\u636e\u65f6\uff0c\u5982\u679c\u672a\u6307\u5b9aIdentity\u5217\u7684\u503c\uff0c\u6570\u636e\u5e93\u4f1a\u81ea\u52a8\u751f\u6210\u4e00\u4e2a\u552f\u4e00\u7684\u81ea\u589e\u6570\u5b57\u4f5c\u4e3a\u6807\u8bc6\u3002\u901a\u8fc7SCOPE_IDENTITY()\u51fd\u6570\uff0c\u53ef\u4ee5\u83b7\u53d6\u6700\u8fd1\u4e00\u6b21\u63d2\u5165\u6570\u636e\u7684Identity\u503c\u3002\u540c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528DBCC CHECKIDENT\u8bed\u53e5\u6765\u81ea\u5b9a\u4e49Identity\u5217\u7684\u5f53\u524d\u503c\u3002\u5e0c\u671b\u672c\u6587\u5bf9\u60a8\u7814\u7a76\u548c\u4f7f\u7528SQL\u4e2d\u7684Identity\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n
            \u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aSQL\u4e2d\u7684IDENTITY\u662f\u4e00\u79cd\u4ec0\u4e48\u6570\u636e\u7c7b\u578b\uff1f\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u5427\uff01<\/p>\n
            \n
            \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
            SQL\u4e2d\u7684IDENTITY\u662f\u4e00\u79cd...<\/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-199653","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199653","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=199653"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199653\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199653"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199653"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199653"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}