{"id":160597,"date":"2024-11-03T23:25:20","date_gmt":"2024-11-03T15:25:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160597\/"},"modified":"2024-11-03T23:25:21","modified_gmt":"2024-11-03T15:25:21","slug":"sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e8%88%87identity%e5%88%97","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160597\/","title":{"rendered":"SQL Server\u6578\u64da\u5eab\u8207identity\u5217"},"content":{"rendered":"<h1 id=\"sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e8%88%87identity%e5%88%97-gYpNjjIUFy\">SQL Server\u6578\u64da\u5eab\u8207identity\u5217<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL Server\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u7279\u5225\u662f\u5728\u4f01\u696d\u74b0\u5883\u4e2d\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u652f\u6301\u6578\u64da\u7684\u5b58\u5132\u3001\u6aa2\u7d22\u548c\u7ba1\u7406\u3002\u5176\u4e2d\uff0cidentity\u5217\u662f\u4e00\u500b\u91cd\u8981\u7684\u7279\u6027\uff0c\u80fd\u5920\u81ea\u52d5\u751f\u6210\u552f\u4e00\u7684\u6578\u503c\uff0c\u901a\u5e38\u7528\u65bc\u4e3b\u9375\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eSQL Server\u4e2d\u7684identity\u5217\u7684\u6982\u5ff5\u3001\u4f7f\u7528\u65b9\u6cd5\u53ca\u5176\u512a\u7f3a\u9ede\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afidentity%e5%88%97%ef%bc%9f-gYpNjjIUFy\">\u4ec0\u9ebc\u662fidentity\u5217\uff1f<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0cidentity\u5217\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5217\u985e\u578b\uff0c\u5141\u8a31\u81ea\u52d5\u751f\u6210\u552f\u4e00\u7684\u6574\u6578\u503c\u3002\u7576\u63d2\u5165\u65b0\u8a18\u9304\u6642\uff0cidentity\u5217\u6703\u81ea\u52d5\u589e\u52a0\uff0c\u7121\u9700\u624b\u52d5\u6307\u5b9a\u503c\u3002\u9019\u5c0d\u65bc\u9700\u8981\u552f\u4e00\u6a19\u8b58\u7684\u6578\u64da\u884c\uff08\u5982\u4e3b\u9375\uff09\u7279\u5225\u6709\u7528\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%baidentity%e5%88%97-gYpNjjIUFy\">\u5982\u4f55\u5275\u5efaidentity\u5217<\/h2>\n<p>\u5275\u5efaidentity\u5217\u975e\u5e38\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728\u5275\u5efa\u8868\u6642\u5b9a\u7fa9identity\u5217\uff1a<\/p>\n<pre><code>CREATE TABLE Customers (\n    CustomerID INT IDENTITY(1,1) PRIMARY KEY,\n    CustomerName NVARCHAR(100),\n    ContactEmail NVARCHAR(100)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cCustomerID\u5217\u88ab\u5b9a\u7fa9\u70baidentity\u5217\uff0c\u8d77\u59cb\u503c\u70ba1\uff0c\u6bcf\u6b21\u63d2\u5165\u65b0\u8a18\u9304\u6642\u81ea\u52d5\u589e\u52a01\u3002<\/p>\n<h2 id=\"identity%e5%88%97%e7%9a%84%e5%b1%ac%e6%80%a7-gYpNjjIUFy\">identity\u5217\u7684\u5c6c\u6027<\/h2>\n<p>identity\u5217\u6709\u5169\u500b\u4e3b\u8981\u5c6c\u6027\uff1a<\/p>\n<ul>\n<li><strong>Seed\uff1a<\/strong>\u9019\u662fidentity\u5217\u7684\u8d77\u59cb\u503c\u3002\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cSeed\u8a2d\u7f6e\u70ba1\u3002<\/li>\n<li><strong>Increment\uff1a<\/strong>\u9019\u662f\u6bcf\u6b21\u63d2\u5165\u65b0\u8a18\u9304\u6642\u81ea\u52d5\u589e\u52a0\u7684\u503c\u3002\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cIncrement\u8a2d\u7f6e\u70ba1\u3002<\/li>\n<\/ul>\n<p>\u9019\u4e9b\u5c6c\u6027\u53ef\u4ee5\u6839\u64da\u9700\u6c42\u9032\u884c\u8abf\u6574\u3002\u4f8b\u5982\uff0c\u5982\u679c\u5e0c\u671b\u5f9e100\u958b\u59cb\u4e26\u6bcf\u6b21\u589e\u52a05\uff0c\u53ef\u4ee5\u9019\u6a23\u5b9a\u7fa9\uff1a<\/p>\n<pre><code>CREATE TABLE Products (\n    ProductID INT IDENTITY(100,5) PRIMARY KEY,\n    ProductName NVARCHAR(100),\n    Price DECIMAL(10,2)\n);<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8identity%e5%88%97%e7%9a%84%e5%84%aa%e9%bb%9e-gYpNjjIUFy\">\u4f7f\u7528identity\u5217\u7684\u512a\u9ede<\/h2>\n<ul>\n<li><strong>\u81ea\u52d5\u5316\uff1a<\/strong>identity\u5217\u81ea\u52d5\u751f\u6210\u552f\u4e00\u503c\uff0c\u6e1b\u5c11\u4e86\u624b\u52d5\u7ba1\u7406\u7684\u9700\u8981\u3002<\/li>\n<li><strong>\u552f\u4e00\u6027\uff1a<\/strong>\u78ba\u4fdd\u6bcf\u4e00\u884c\u90fd\u6709\u552f\u4e00\u7684\u6a19\u8b58\u7b26\uff0c\u9019\u5c0d\u65bc\u6578\u64da\u5b8c\u6574\u6027\u81f3\u95dc\u91cd\u8981\u3002<\/li>\n<li><strong>\u7c21\u5316\u4ee3\u78bc\uff1a<\/strong>\u5728\u63d2\u5165\u6578\u64da\u6642\uff0c\u7121\u9700\u6307\u5b9a\u4e3b\u9375\u503c\uff0c\u7c21\u5316\u4e86SQL\u8a9e\u53e5\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8identity%e5%88%97%e7%9a%84%e7%bc%ba%e9%bb%9e-gYpNjjIUFy\">\u4f7f\u7528identity\u5217\u7684\u7f3a\u9ede<\/h2>\n<ul>\n<li><strong>\u4e0d\u53ef\u91cd\u7528\uff1a<\/strong>\u4e00\u65e6\u751f\u6210\u7684identity\u503c\u88ab\u4f7f\u7528\uff0c\u5c31\u7121\u6cd5\u91cd\u7528\uff0c\u5373\u4f7f\u8a72\u884c\u88ab\u522a\u9664\u3002<\/li>\n<li><strong>\u7121\u6cd5\u624b\u52d5\u8a2d\u7f6e\uff1a<\/strong>\u5728\u63d2\u5165\u6578\u64da\u6642\uff0c\u7121\u6cd5\u624b\u52d5\u6307\u5b9aidentity\u5217\u7684\u503c\uff0c\u9019\u53ef\u80fd\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u9020\u6210\u4e0d\u4fbf\u3002<\/li>\n<li><strong>\u53ef\u80fd\u5c0e\u81f4\u7a7a\u6d1e\uff1a<\/strong>\u5982\u679c\u522a\u9664\u67d0\u4e9b\u884c\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4identity\u5217\u4e2d\u51fa\u73fe\u7a7a\u6d1e\uff0c\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u4e0d\u7406\u60f3\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e9%87%8d%e7%bd%aeidentity%e5%88%97-gYpNjjIUFy\">\u5982\u4f55\u91cd\u7f6eidentity\u5217<\/h2>\n<p>\u5982\u679c\u9700\u8981\u91cd\u7f6eidentity\u5217\u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528DBCC CHECKIDENT\u547d\u4ee4\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u547d\u4ee4\u5c07CustomerID\u91cd\u7f6e\u70ba1\uff1a<\/p>\n<pre><code>DBCC CHECKIDENT ('Customers', RESEED, 1);<\/code><\/pre>\n<p>\u9019\u5c07\u4f7f\u4e0b\u4e00\u6b21\u63d2\u5165\u7684\u8a18\u9304\u7684CustomerID\u503c\u70ba1\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-gYpNjjIUFy\">\u7d50\u8ad6<\/h2>\n<p>SQL Server\u4e2d\u7684identity\u5217\u662f\u4e00\u500b\u5f37\u5927\u7684\u529f\u80fd\uff0c\u80fd\u5920\u81ea\u52d5\u751f\u6210\u552f\u4e00\u7684\u6574\u6578\u503c\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\u904e\u7a0b\u3002\u96d6\u7136\u5b83\u6709\u4e00\u4e9b\u7f3a\u9ede\uff0c\u4f46\u5728\u5927\u591a\u6578\u60c5\u6cc1\u4e0b\uff0cidentity\u5217\u63d0\u4f9b\u7684\u4fbf\u5229\u6027\u548c\u6578\u64da\u5b8c\u6574\u6027\u4f7f\u5176\u6210\u70ba\u4e00\u500b\u7406\u60f3\u7684\u9078\u64c7\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u4e86\u89e3\u548c\u6b63\u78ba\u4f7f\u7528identity\u5217\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3SQL Server\u6578\u64da\u5eab\u4e2d\u7684identity\u5217\uff0c\u5982\u4f55\u81ea\u52d5\u751f\u6210\u552f\u4e00\u8b58\u5225\u78bc\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\u8207\u63d2\u5165\u64cd\u4f5c\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-160597","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160597","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=160597"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160597\/revisions"}],"predecessor-version":[{"id":160598,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160597\/revisions\/160598"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160597"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160597"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}