{"id":193295,"date":"2024-11-12T20:59:07","date_gmt":"2024-11-12T12:59:07","guid":{"rendered":"https:\/\/server.hk\/cnblog\/193295\/"},"modified":"2024-11-12T20:59:08","modified_gmt":"2024-11-12T12:59:08","slug":"%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e4%bf%a1%e6%81%af%e6%95%99%e7%a8%8b-%e6%80%8e%e9%ba%bc%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e4%bf%a1%e6%81%af","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/193295\/","title":{"rendered":"\u4fee\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u4fe1\u606f\u6559\u7a0b (\u600e\u9ebc\u4fee\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u4fe1\u606f)"},"content":{"rendered":"<h1 id=\"%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e4%bf%a1%e6%81%af%e6%95%99%e7%a8%8b-%e6%80%8e%e9%ba%bc%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e4%bf%a1%e6%81%af-HJqaJDaqGo\">\u4fee\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u4fe1\u606f\u6559\u7a0b (\u600e\u9ebc\u4fee\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u4fe1\u606f)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u4fee\u6539\u5b57\u6bb5\u4fe1\u606f\u662f\u4e00\u9805\u5e38\u898b\u7684\u4efb\u52d9\u3002\u7121\u8ad6\u662f\u56e0\u70ba\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u66f4\uff0c\u9084\u662f\u6578\u64da\u7d50\u69cb\u7684\u512a\u5316\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u4fee\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u4fe1\u606f\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u548c\u958b\u767c\u8005\u4f86\u8aaa\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u9032\u884c\u5b57\u6bb5\u4fee\u6539\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u548c\u6b65\u9a5f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%ef%bc%9f-HJqaJDaqGo\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u5b57\u6bb5\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u5b57\u6bb5\u662f\u6578\u64da\u8868\u4e2d\u7684\u4e00\u500b\u5217\uff0c\u7528\u65bc\u5b58\u5132\u7279\u5b9a\u985e\u578b\u7684\u4fe1\u606f\u3002\u6bcf\u500b\u5b57\u6bb5\u90fd\u6709\u5176\u6578\u64da\u985e\u578b\uff0c\u4f8b\u5982\u6574\u6578\u3001\u5b57\u7b26\u4e32\u3001\u65e5\u671f\u7b49\u3002\u5b57\u6bb5\u7684\u8a2d\u8a08\u76f4\u63a5\u5f71\u97ff\u5230\u6578\u64da\u7684\u5b58\u5132\u548c\u67e5\u8a62\u6548\u7387\uff0c\u56e0\u6b64\u5728\u4fee\u6539\u5b57\u6bb5\u4fe1\u606f\u6642\u9700\u8981\u8b39\u614e\u8003\u616e\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%e4%bf%a1%e6%81%af%ef%bc%9f-HJqaJDaqGo\">\u70ba\u4ec0\u9ebc\u9700\u8981\u4fee\u6539\u5b57\u6bb5\u4fe1\u606f\uff1f<\/h2>\n<ul>\n<li><strong>\u696d\u52d9\u9700\u6c42\u8b8a\u66f4\uff1a<\/strong>\u96a8\u8457\u696d\u52d9\u7684\u767c\u5c55\uff0c\u6578\u64da\u7d50\u69cb\u53ef\u80fd\u9700\u8981\u8abf\u6574\u4ee5\u9069\u61c9\u65b0\u7684\u9700\u6c42\u3002<\/li>\n<li><strong>\u6578\u64da\u985e\u578b\u512a\u5316\uff1a<\/strong>\u6839\u64da\u5be6\u969b\u4f7f\u7528\u60c5\u6cc1\uff0c\u53ef\u80fd\u9700\u8981\u66f4\u6539\u5b57\u6bb5\u7684\u6578\u64da\u985e\u578b\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li><strong>\u5b57\u6bb5\u540d\u7a31\u66f4\u6539\uff1a<\/strong>\u70ba\u4e86\u63d0\u9ad8\u53ef\u8b80\u6027\u6216\u7b26\u5408\u547d\u540d\u898f\u7bc4\uff0c\u53ef\u80fd\u9700\u8981\u4fee\u6539\u5b57\u6bb5\u540d\u7a31\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e4%bf%a1%e6%81%af-HJqaJDaqGo\">\u5982\u4f55\u4fee\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u4fe1\u606f<\/h2>\n<p>\u4ee5\u4e0b\u662f\u91dd\u5c0d\u4e0d\u540c\u6578\u64da\u5eab\u7cfb\u7d71\u7684\u5b57\u6bb5\u4fee\u6539\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-mysql-HJqaJDaqGo\">1. MySQL<\/h3>\n<p>\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u4f86\u4fee\u6539\u5b57\u6bb5\u4fe1\u606f\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d MODIFY COLUMN \u5b57\u6bb5\u540d \u65b0\u6578\u64da\u985e\u578b;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07\u540d\u70ba\u201cage\u201d\u7684\u5b57\u6bb5\u985e\u578b\u5f9eINT\u4fee\u6539\u70baTINYINT\uff1a<\/p>\n<pre><code>ALTER TABLE users MODIFY COLUMN age TINYINT;<\/code><\/pre>\n<h3 id=\"2-postgresql-HJqaJDaqGo\">2. PostgreSQL<\/h3>\n<p>\u5728PostgreSQL\u4e2d\uff0c\u4fee\u6539\u5b57\u6bb5\u4fe1\u606f\u7684\u8a9e\u6cd5\u8207MySQL\u985e\u4f3c\uff0c\u4f46\u4f7f\u7528\u7684\u662fALTER COLUMN\u95dc\u9375\u5b57\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d ALTER COLUMN \u5b57\u6bb5\u540d TYPE \u65b0\u6578\u64da\u985e\u578b;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07\u201cbirthdate\u201d\u5b57\u6bb5\u7684\u985e\u578b\u5f9eDATE\u4fee\u6539\u70baTIMESTAMP\uff1a<\/p>\n<pre><code>ALTER TABLE users ALTER COLUMN birthdate TYPE TIMESTAMP;<\/code><\/pre>\n<h3 id=\"3-sql-server-HJqaJDaqGo\">3. SQL Server<\/h3>\n<p>\u5728SQL Server\u4e2d\uff0c\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u4f86\u4fee\u6539\u5b57\u6bb5\u4fe1\u606f\uff0c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d ALTER COLUMN \u5b57\u6bb5\u540d \u65b0\u6578\u64da\u985e\u578b;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07\u201cusername\u201d\u5b57\u6bb5\u7684\u985e\u578b\u5f9eVARCHAR(50)\u4fee\u6539\u70baVARCHAR(100)\uff1a<\/p>\n<pre><code>ALTER TABLE users ALTER COLUMN username VARCHAR(100);<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-HJqaJDaqGo\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u5728\u4fee\u6539\u5b57\u6bb5\u4e4b\u524d\uff0c\u5efa\u8b70\u5099\u4efd\u6578\u64da\u5eab\uff0c\u4ee5\u9632\u6b62\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<li>\u78ba\u4fdd\u5728\u4fee\u6539\u5b57\u6bb5\u985e\u578b\u6642\uff0c\u73fe\u6709\u6578\u64da\u80fd\u5920\u517c\u5bb9\u65b0\u7684\u6578\u64da\u985e\u578b\u3002<\/li>\n<li>\u5728\u751f\u7522\u74b0\u5883\u4e2d\u9032\u884c\u4fee\u6539\u6642\uff0c\u61c9\u8003\u616e\u5230\u5c0d\u7cfb\u7d71\u6027\u80fd\u7684\u5f71\u97ff\uff0c\u6700\u597d\u5728\u4f4e\u5cf0\u671f\u9032\u884c\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-HJqaJDaqGo\">\u7e3d\u7d50<\/h2>\n<p>\u4fee\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u4fe1\u606f\u662f\u4e00\u9805\u91cd\u8981\u7684\u6578\u64da\u5eab\u7ba1\u7406\u4efb\u52d9\uff0c\u7121\u8ad6\u662f\u5728MySQL\u3001PostgreSQL\u9084\u662fSQL Server\u4e2d\uff0c\u638c\u63e1\u6b63\u78ba\u7684\u8a9e\u6cd5\u548c\u6b65\u9a5f\u90fd\u80fd\u5e6b\u52a9\u60a8\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u7d50\u69cb\u7684\u8abf\u6574\u3002\u96a8\u8457\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u5316\uff0c\u9748\u6d3b\u5730\u4fee\u6539\u6578\u64da\u5eab\u7d50\u69cb\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u7cfb\u7d71\u7684\u6027\u80fd\u548c\u53ef\u7dad\u8b77\u6027\u3002\u5982\u679c\u60a8\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u7ba1\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u767c\u5c55\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4fee\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u4fe1\u606f\u7684\u8a73\u7d30\u6559\u7a0b\uff0c\u6b65\u9a5f\u7c21\u55ae\u660e\u77ad\uff0c\u5e6b\u52a9\u4f60\u8f15\u9b06\u66f4\u65b0\u6578\u64da\u5eab\u7d50\u69cb\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-193295","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193295","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=193295"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193295\/revisions"}],"predecessor-version":[{"id":193296,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193295\/revisions\/193296"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=193295"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=193295"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=193295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}