{"id":75772,"date":"2024-10-16T01:05:17","date_gmt":"2024-10-15T17:05:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/75772\/"},"modified":"2024-10-16T01:05:17","modified_gmt":"2024-10-15T17:05:17","slug":"mysql-%e8%a1%a8%e4%bf%ae%e6%94%b9%e7%9a%84%e5%af%a6%e9%9a%9b%e6%93%8d%e4%bd%9c%e8%aa%9e%e6%b3%95%e6%8f%8f%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/75772\/","title":{"rendered":"MySQL \u8868\u4fee\u6539\u7684\u5be6\u969b\u64cd\u4f5c\u8a9e\u6cd5\u63cf\u8ff0"},"content":{"rendered":"<h1 id=\"mysql-%e8%a1%a8%e4%bf%ae%e6%94%b9%e7%9a%84%e5%af%a6%e9%9a%9b%e6%93%8d%e4%bd%9c%e8%aa%9e%e6%b3%95%e6%8f%8f%e8%bf%b0-EUsdHPdWOn\">MySQL \u8868\u4fee\u6539\u7684\u5be6\u969b\u64cd\u4f5c\u8a9e\u6cd5\u63cf\u8ff0<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL \u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5c0d\u65bc\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u4f86\u8aaa\uff0c\u4e86\u89e3\u5982\u4f55\u4fee\u6539\u8868\u7d50\u69cb\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u4ecb\u7d39 MySQL \u4e2d\u8868\u4fee\u6539\u7684\u5be6\u969b\u64cd\u4f5c\u8a9e\u6cd5\uff0c\u5305\u62ec\u6dfb\u52a0\u3001\u522a\u9664\u548c\u4fee\u6539\u5217\u7b49\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"1-%e4%bf%ae%e6%94%b9%e8%a1%a8%e7%b5%90%e6%a7%8b%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-EUsdHPdWOn\">1. \u4fee\u6539\u8868\u7d50\u69cb\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u4fee\u6539\u8868\u7d50\u69cb\u7684\u4e3b\u8981\u547d\u4ee4\u662f <code>ALTER TABLE<\/code>\u3002\u9019\u500b\u547d\u4ee4\u53ef\u4ee5\u7528\u4f86\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u8868\u4e2d\u7684\u5217\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\u7d50\u69cb\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    action;<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>table_name<\/code> \u662f\u8981\u4fee\u6539\u7684\u8868\u7684\u540d\u7a31\uff0c<code>action<\/code> \u662f\u5177\u9ad4\u7684\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"2-%e6%b7%bb%e5%8a%a0%e6%96%b0%e5%88%97-EUsdHPdWOn\">2. \u6dfb\u52a0\u65b0\u5217<\/h2>\n<p>\u8981\u5728\u73fe\u6709\u7684\u8868\u4e2d\u6dfb\u52a0\u65b0\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    ADD column_name column_type;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>users<\/code> \u7684\u8868\uff0c\u6211\u5011\u60f3\u8981\u6dfb\u52a0\u4e00\u500b\u540d\u70ba <code>age<\/code> \u7684\u6574\u6578\u5217\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users\n    ADD age INT;<\/code><\/pre>\n<h2 id=\"3-%e5%88%aa%e9%99%a4%e5%88%97-EUsdHPdWOn\">3. \u522a\u9664\u5217<\/h2>\n<p>\u5982\u679c\u9700\u8981\u522a\u9664\u8868\u4e2d\u7684\u67d0\u4e00\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>DROP COLUMN<\/code> \u4f86\u5be6\u73fe\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    DROP COLUMN column_name;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5f9e <code>users<\/code> \u8868\u4e2d\u522a\u9664 <code>age<\/code> \u5217\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ALTER TABLE users\n    DROP COLUMN age;<\/code><\/pre>\n<h2 id=\"4-%e4%bf%ae%e6%94%b9%e5%88%97%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-EUsdHPdWOn\">4. \u4fee\u6539\u5217\u7684\u6578\u64da\u985e\u578b<\/h2>\n<p>\u6709\u6642\u5019\u9700\u8981\u4fee\u6539\u5217\u7684\u6578\u64da\u985e\u578b\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>MODIFY COLUMN<\/code> \u4f86\u9054\u6210\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    MODIFY COLUMN column_name new_column_type;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07 <code>users<\/code> \u8868\u4e2d\u7684 <code>age<\/code> \u5217\u7684\u6578\u64da\u985e\u578b\u5f9e\u6574\u6578\u6539\u70ba\u6d6e\u9ede\u6578\uff1a<\/p>\n<pre><code>ALTER TABLE users\n    MODIFY COLUMN age FLOAT;<\/code><\/pre>\n<h2 id=\"5-%e9%87%8d%e5%91%bd%e5%90%8d%e5%88%97-EUsdHPdWOn\">5. \u91cd\u547d\u540d\u5217<\/h2>\n<p>\u5982\u679c\u9700\u8981\u91cd\u547d\u540d\u67d0\u4e00\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>CHANGE COLUMN<\/code> \u547d\u4ee4\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    CHANGE COLUMN old_column_name new_column_name column_type;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07 <code>users<\/code> \u8868\u4e2d\u7684 <code>age<\/code> \u5217\u91cd\u547d\u540d\u70ba <code>user_age<\/code>\uff1a<\/p>\n<pre><code>ALTER TABLE users\n    CHANGE COLUMN age user_age INT;<\/code><\/pre>\n<h2 id=\"6-%e6%b7%bb%e5%8a%a0%e4%b8%bb%e9%8d%b5%e6%88%96%e7%b4%a2%e5%bc%95-EUsdHPdWOn\">6. \u6dfb\u52a0\u4e3b\u9375\u6216\u7d22\u5f15<\/h2>\n<p>\u5728\u8868\u4e2d\u6dfb\u52a0\u4e3b\u9375\u6216\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u4ee5\u4e0b\u662f\u6dfb\u52a0\u4e3b\u9375\u7684\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE table_name\n    ADD PRIMARY KEY (column_name);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07 <code>users<\/code> \u8868\u7684 <code>id<\/code> \u5217\u8a2d\u7f6e\u70ba\u4e3b\u9375\uff1a<\/p>\n<pre><code>ALTER TABLE users\n    ADD PRIMARY KEY (id);<\/code><\/pre>\n<h2 id=\"7-%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-EUsdHPdWOn\">7. \u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u5728\u9032\u884c\u8868\u7d50\u69cb\u4fee\u6539\u4e4b\u524d\uff0c\u5efa\u8b70\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<li>\u67d0\u4e9b\u64cd\u4f5c\u53ef\u80fd\u6703\u5f71\u97ff\u8868\u7684\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u9032\u884c\u4fee\u6539\u6642\u3002<\/li>\n<li>\u5728\u751f\u7522\u74b0\u5883\u4e2d\uff0c\u61c9\u8b39\u614e\u9032\u884c\u7d50\u69cb\u4fee\u6539\uff0c\u6700\u597d\u5728\u4f4e\u5cf0\u671f\u9032\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-EUsdHPdWOn\">\u7e3d\u7d50<\/h2>\n<p>MySQL \u63d0\u4f9b\u4e86\u9748\u6d3b\u7684\u8868\u7d50\u69cb\u4fee\u6539\u529f\u80fd\uff0c\u901a\u904e <code>ALTER TABLE<\/code> \u547d\u4ee4\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u5217\u3002\u4e86\u89e3\u9019\u4e9b\u57fa\u672c\u64cd\u4f5c\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u7dad\u8b77\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u4f86\u6258\u7ba1\u60a8\u7684 MySQL \u6578\u64da\u5eab\uff0c\u4eab\u53d7\u66f4\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u5b89\u5168\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3 MySQL \u8868\u4fee\u6539\u7684\u5be6\u969b\u64cd\u4f5c\u8a9e\u6cd5\uff0c\u5305\u62ec\u6dfb\u52a0\u3001\u522a\u9664\u548c\u4fee\u6539\u6b04\u4f4d\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\u6548\u7387\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-75772","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75772","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=75772"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75772\/revisions"}],"predecessor-version":[{"id":75773,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75772\/revisions\/75773"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=75772"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=75772"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=75772"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}