{"id":66279,"date":"2024-10-14T16:05:20","date_gmt":"2024-10-14T08:05:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/66279\/"},"modified":"2024-10-14T16:05:20","modified_gmt":"2024-10-14T08:05:20","slug":"mssql%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e5%a4%a7%e5%b0%8f%ef%bc%9a%e6%96%b0%e7%9a%84%e6%a9%9f%e6%9c%83%e7%ad%89%e8%91%97%e4%bd%a0%ef%bc%88mssql%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e5%a4%a7%e5%b0%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/66279\/","title":{"rendered":"MSSQL\u4fee\u6539\u5b57\u6bb5\u5927\u5c0f\uff1a\u65b0\u7684\u6a5f\u6703\u7b49\u8457\u4f60\uff08mssql\u4fee\u6539\u5b57\u6bb5\u5927\u5c0f\uff09"},"content":{"rendered":"<h1 id=\"mssql%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e5%a4%a7%e5%b0%8f%ef%bc%9a%e6%96%b0%e7%9a%84%e6%a9%9f%e6%9c%83%e7%ad%89%e8%91%97%e4%bd%a0-HGXKlzOAYk\">MSSQL\u4fee\u6539\u5b57\u6bb5\u5927\u5c0f\uff1a\u65b0\u7684\u6a5f\u6703\u7b49\u8457\u4f60<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u5b57\u6bb5\u5927\u5c0f\u7684\u8abf\u6574\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u7279\u5225\u662f\u5728\u4f7f\u7528 Microsoft SQL Server (MSSQL) \u6642\uff0c\u96a8\u8457\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u5316\uff0c\u53ef\u80fd\u9700\u8981\u5c0d\u67d0\u4e9b\u5b57\u6bb5\u7684\u5927\u5c0f\u9032\u884c\u4fee\u6539\u3002\u9019\u4e0d\u50c5\u80fd\u5920\u63d0\u9ad8\u6578\u64da\u7684\u5b58\u5132\u6548\u7387\uff0c\u9084\u80fd\u6539\u5584\u67e5\u8a62\u6027\u80fd\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5728 MSSQL \u4e2d\u4fee\u6539\u5b57\u6bb5\u5927\u5c0f\uff0c\u4ee5\u53ca\u9019\u4e00\u904e\u7a0b\u4e2d\u9700\u8981\u6ce8\u610f\u7684\u4e8b\u9805\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e5%a4%a7%e5%b0%8f%ef%bc%9f-HGXKlzOAYk\">\u70ba\u4ec0\u9ebc\u9700\u8981\u4fee\u6539\u5b57\u6bb5\u5927\u5c0f\uff1f<\/h2>\n<p>\u96a8\u8457\u696d\u52d9\u7684\u767c\u5c55\uff0c\u6578\u64da\u7684\u6027\u8cea\u548c\u91cf\u53ef\u80fd\u6703\u767c\u751f\u8b8a\u5316\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u539f\u56e0\uff0c\u70ba\u4ec0\u9ebc\u9700\u8981\u4fee\u6539\u5b57\u6bb5\u5927\u5c0f\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u589e\u9577\uff1a<\/strong>\u96a8\u8457\u6642\u9593\u7684\u63a8\u79fb\uff0c\u67d0\u4e9b\u5b57\u6bb5\u7684\u6578\u64da\u53ef\u80fd\u6703\u8d85\u51fa\u539f\u6709\u7684\u5927\u5c0f\u9650\u5236\u3002<\/li>\n<li><strong>\u6027\u80fd\u512a\u5316\uff1a<\/strong>\u9069\u7576\u7684\u5b57\u6bb5\u5927\u5c0f\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u6e1b\u5c11\u5b58\u5132\u7a7a\u9593\u7684\u6d6a\u8cbb\u3002<\/li>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027\uff1a<\/strong>\u5728\u6578\u64da\u9077\u79fb\u6216\u6574\u5408\u904e\u7a0b\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u8abf\u6574\u5b57\u6bb5\u5927\u5c0f\u4ee5\u4fdd\u6301\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e5%a4%a7%e5%b0%8f-HGXKlzOAYk\">\u5982\u4f55\u4fee\u6539\u5b57\u6bb5\u5927\u5c0f<\/h2>\n<p>\u5728 MSSQL \u4e2d\uff0c\u4fee\u6539\u5b57\u6bb5\u5927\u5c0f\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d\nALTER COLUMN \u5217\u540d \u6578\u64da\u985e\u578b(\u65b0\u5927\u5c0f);<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u5177\u9ad4\u7684\u4f8b\u5b50\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>Customers<\/code> \u7684\u8868\uff0c\u4e26\u4e14\u9700\u8981\u5c07 <code>LastName<\/code> \u5217\u7684\u5927\u5c0f\u5f9e 50 \u589e\u52a0\u5230 100\uff1a<\/p>\n<pre><code>ALTER TABLE Customers\nALTER COLUMN LastName NVARCHAR(100);<\/code><\/pre>\n<h3 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-HGXKlzOAYk\">\u6ce8\u610f\u4e8b\u9805<\/h3>\n<p>\u5728\u9032\u884c\u5b57\u6bb5\u5927\u5c0f\u4fee\u6539\u6642\uff0c\u6709\u5e7e\u500b\u91cd\u8981\u7684\u6ce8\u610f\u4e8b\u9805\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u640d\u5931\u98a8\u96aa\uff1a<\/strong>\u5982\u679c\u5c07\u5b57\u6bb5\u5927\u5c0f\u7e2e\u5c0f\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u640d\u5931\u3002\u56e0\u6b64\uff0c\u5728\u9032\u884c\u6b64\u985e\u64cd\u4f5c\u4e4b\u524d\uff0c\u52d9\u5fc5\u5099\u4efd\u6578\u64da\u3002<\/li>\n<li><strong>\u9396\u5b9a\u554f\u984c\uff1a<\/strong>\u4fee\u6539\u5b57\u6bb5\u5927\u5c0f\u53ef\u80fd\u6703\u5c0e\u81f4\u8868\u9396\u5b9a\uff0c\u5f71\u97ff\u5176\u4ed6\u7528\u6236\u7684\u64cd\u4f5c\u3002\u5efa\u8b70\u5728\u4f4e\u5cf0\u6642\u6bb5\u9032\u884c\u6b64\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u6027\u80fd\u5f71\u97ff\uff1a<\/strong>\u5728\u5927\u578b\u8868\u4e0a\u9032\u884c\u5b57\u6bb5\u5927\u5c0f\u4fee\u6539\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u5efa\u8b70\u5728\u9032\u884c\u4fee\u6539\u524d\u9032\u884c\u6027\u80fd\u8a55\u4f30\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b8%ac%e8%a9%a6%e5%92%8c%e9%a9%97%e8%ad%89-HGXKlzOAYk\">\u6e2c\u8a66\u548c\u9a57\u8b49<\/h2>\n<p>\u5728\u4fee\u6539\u5b57\u6bb5\u5927\u5c0f\u5f8c\uff0c\u52d9\u5fc5\u9032\u884c\u6e2c\u8a66\u548c\u9a57\u8b49\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u61c9\u7528\u7a0b\u5e8f\u7684\u6b63\u5e38\u904b\u884c\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u6aa2\u67e5\u5b57\u6bb5\u7684\u5927\u5c0f\uff1a<\/p>\n<pre><code>SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH\nFROM INFORMATION_SCHEMA.COLUMNS\nWHERE TABLE_NAME = 'Customers';<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u8a8d <code>LastName<\/code> \u5217\u7684\u5927\u5c0f\u5df2\u6210\u529f\u66f4\u65b0\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-HGXKlzOAYk\">\u7d50\u8ad6<\/h2>\n<p>\u4fee\u6539 MSSQL \u4e2d\u5b57\u6bb5\u7684\u5927\u5c0f\u662f\u4e00\u500b\u91cd\u8981\u7684\u6578\u64da\u5eab\u7ba1\u7406\u4efb\u52d9\uff0c\u80fd\u5920\u5e6b\u52a9\u4f01\u696d\u66f4\u597d\u5730\u9069\u61c9\u4e0d\u65b7\u8b8a\u5316\u7684\u9700\u6c42\u3002\u901a\u904e\u6b63\u78ba\u7684\u64cd\u4f5c\u548c\u5145\u5206\u7684\u6e96\u5099\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u6578\u64da\u640d\u5931\u548c\u6027\u80fd\u554f\u984c\u3002\u96a8\u8457\u6280\u8853\u7684\u9032\u6b65\uff0c\u9019\u4e00\u904e\u7a0b\u5c07\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u7c21\u55ae\uff0c\u70ba\u4f01\u696d\u5e36\u4f86\u65b0\u7684\u6a5f\u6703\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u5176\u4ed6\u61c9\u7528\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u5728MSSQL\u4e2d\u4fee\u6539\u5b57\u6bb5\u5927\u5c0f\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\uff0c\u958b\u555f\u65b0\u7684\u6a5f\u6703\uff0c\u8b93\u4f60\u7684\u6578\u64da\u7ba1\u7406\u66f4\u9ad8\u6548\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-66279","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66279","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=66279"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66279\/revisions"}],"predecessor-version":[{"id":66280,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66279\/revisions\/66280"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=66279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=66279"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=66279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}