{"id":76192,"date":"2024-10-16T04:37:15","date_gmt":"2024-10-15T20:37:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76192\/"},"modified":"2024-10-16T04:37:15","modified_gmt":"2024-10-15T20:37:15","slug":"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8alter-table-table-modify-column-column-type%e6%9b%b4%e6%94%b9%e5%88%97%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e3%80%82","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76192\/","title":{"rendered":"MySQL\u5165\u9580\uff1a\u4f7f\u7528ALTER TABLE [table] MODIFY COLUMN column type\u66f4\u6539\u5217\u7684\u6578\u64da\u985e\u578b\u3002"},"content":{"rendered":"<h1 id=\"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8alter-table-table-modify-column-column-type%e6%9b%b4%e6%94%b9%e5%88%97%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-jQVDKtItLh\">MySQL\u5165\u9580\uff1a\u4f7f\u7528ALTER TABLE [table] MODIFY COLUMN column type\u66f4\u6539\u5217\u7684\u6578\u64da\u985e\u578b<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u975e\u5e38\u6d41\u884c\u7684\u9078\u64c7\uff0c\u56e0\u70ba\u5b83\u7684\u9748\u6d3b\u6027\u548c\u5f37\u5927\u7684\u529f\u80fd\u3002\u7576\u6211\u5011\u9700\u8981\u66f4\u6539\u6578\u64da\u8868\u4e2d\u67d0\u4e00\u5217\u7684\u6578\u64da\u985e\u578b\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528ALTER TABLE [table] MODIFY COLUMN column type\u4f86\u66f4\u6539\u5217\u7684\u6578\u64da\u985e\u578b\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"alter-table%e8%aa%9e%e5%8f%a5%e6%a6%82%e8%bf%b0-jQVDKtItLh\">ALTER TABLE\u8a9e\u53e5\u6982\u8ff0<\/h2>\n<p>ALTER TABLE\u8a9e\u53e5\u662f\u7528\u4f86\u4fee\u6539\u5df2\u5b58\u5728\u7684\u6578\u64da\u8868\u7d50\u69cb\u7684SQL\u547d\u4ee4\u3002\u9019\u5305\u62ec\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u5217\u3002\u7576\u6211\u5011\u9700\u8981\u66f4\u6539\u67d0\u4e00\u5217\u7684\u6578\u64da\u985e\u578b\u6642\uff0c\u4f7f\u7528MODIFY COLUMN\u5b50\u53e5\u662f\u6700\u5408\u9069\u7684\u9078\u64c7\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-jQVDKtItLh\">\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<pre><code>ALTER TABLE [table_name] MODIFY COLUMN [column_name] [new_data_type];<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>[table_name]<\/code>\u662f\u4f60\u8981\u4fee\u6539\u7684\u6578\u64da\u8868\u540d\u7a31\uff0c<code>[column_name]<\/code>\u662f\u4f60\u8981\u66f4\u6539\u7684\u5217\u540d\u7a31\uff0c\u800c<code>[new_data_type]<\/code>\u5247\u662f\u4f60\u5e0c\u671b\u5c07\u8a72\u5217\u66f4\u6539\u70ba\u7684\u65b0\u6578\u64da\u985e\u578b\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%a4%ba%e4%be%8b-jQVDKtItLh\">\u6578\u64da\u985e\u578b\u793a\u4f8b<\/h2>\n<p>MySQL\u652f\u6301\u591a\u7a2e\u6578\u64da\u985e\u578b\uff0c\u5305\u62ec\u6574\u6578\u3001\u6d6e\u9ede\u6578\u3001\u5b57\u7b26\u4e32\u3001\u65e5\u671f\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u6578\u64da\u985e\u578b\uff1a<\/p>\n<ul>\n<li><code>INT<\/code>\uff1a\u6574\u6578\u985e\u578b<\/li>\n<li><code>VARCHAR(n)<\/code>\uff1a\u53ef\u8b8a\u9577\u5ea6\u5b57\u7b26\u4e32\uff0c<code>n<\/code>\u8868\u793a\u6700\u5927\u5b57\u7b26\u6578<\/li>\n<li><code>TEXT<\/code>\uff1a\u9577\u6587\u672c\u5b57\u7b26\u4e32<\/li>\n<li><code>DATE<\/code>\uff1a\u65e5\u671f\u985e\u578b<\/li>\n<li><code>FLOAT<\/code>\uff1a\u6d6e\u9ede\u6578\u985e\u578b<\/li>\n<\/ul>\n<h2 id=\"%e5%af%a6%e9%9a%9b%e7%a4%ba%e4%be%8b-jQVDKtItLh\">\u5be6\u969b\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>users<\/code>\u7684\u6578\u64da\u8868\uff0c\u5176\u4e2d\u6709\u4e00\u500b\u540d\u70ba<code>age<\/code>\u7684\u5217\uff0c\u7576\u524d\u6578\u64da\u985e\u578b\u70ba<code>VARCHAR(3)<\/code>\uff0c\u4f46\u6211\u5011\u5e0c\u671b\u5c07\u5176\u66f4\u6539\u70ba<code>INT<\/code>\u4ee5\u4fbf\u66f4\u597d\u5730\u5b58\u5132\u5e74\u9f61\u6578\u64da\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE users MODIFY COLUMN age INT;<\/code><\/pre>\n<p>\u57f7\u884c\u9019\u689d\u8a9e\u53e5\u5f8c\uff0c<code>age<\/code>\u5217\u7684\u6578\u64da\u985e\u578b\u5c07\u88ab\u66f4\u6539\u70ba\u6574\u6578\u985e\u578b\uff0c\u9019\u6a23\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u8a08\u7b97\u548c\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-jQVDKtItLh\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528ALTER TABLE\u547d\u4ee4\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5728\u66f4\u6539\u6578\u64da\u985e\u578b\u4e4b\u524d\uff0c\u78ba\u4fdd\u8a72\u5217\u4e2d\u7684\u6578\u64da\u53ef\u4ee5\u8f49\u63db\u70ba\u65b0\u985e\u578b\uff0c\u5426\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<li>\u5728\u9032\u884c\u7d50\u69cb\u66f4\u6539\u4e4b\u524d\uff0c\u5efa\u8b70\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<li>\u67d0\u4e9b\u6578\u64da\u985e\u578b\u7684\u66f4\u6539\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u56e0\u6b64\u5728\u9032\u884c\u66f4\u6539\u6642\u8981\u8b39\u614e\u8003\u616e\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-jQVDKtItLh\">\u7e3d\u7d50<\/h2>\n<p>\u4f7f\u7528ALTER TABLE [table] MODIFY COLUMN column type\u4f86\u66f4\u6539\u5217\u7684\u6578\u64da\u985e\u578b\u662f\u4e00\u500b\u5f37\u5927\u4e14\u9748\u6d3b\u7684\u529f\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u6839\u64da\u9700\u6c42\u8abf\u6574\u6578\u64da\u5eab\u7d50\u69cb\u3002\u7121\u8ad6\u662f\u70ba\u4e86\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\u9084\u662f\u70ba\u4e86\u512a\u5316\u6027\u80fd\uff0c\u9019\u500b\u547d\u4ee4\u90fd\u80fd\u63d0\u4f9b\u6709\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684\u4e3b\u6a5f\u670d\u52d9\u81f3\u95dc\u91cd\u8981\u3002\u4e86\u89e3\u5982\u4f55\u4f7f\u7528MySQL\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\uff0c\u4e26\u9078\u64c7\u5408\u9069\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\uff0c\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u60a8\u7684\u696d\u52d9\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528ALTER TABLE [table] MODIFY COLUMN column type\u5728MySQL\u4e2d\u66f4\u6539\u5217\u7684\u6578\u64da\u985e\u578b\uff0c\u7c21\u55ae\u6613\u61c2\u7684\u5165\u9580\u6307\u5357\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-76192","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76192","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=76192"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76192\/revisions"}],"predecessor-version":[{"id":76193,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76192\/revisions\/76193"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76192"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}