{"id":77214,"date":"2024-10-16T10:32:17","date_gmt":"2024-10-16T02:32:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/77214\/"},"modified":"2024-10-16T10:32:17","modified_gmt":"2024-10-16T02:32:17","slug":"mysql%e4%bf%ae%e6%94%b9%e8%a1%a8%e7%b5%90%e6%a7%8b%e8%aa%9e%e5%8f%a5%e4%bb%8b%e7%b4%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/77214\/","title":{"rendered":"MySQL\u4fee\u6539\u8868\u7d50\u69cb\u8a9e\u53e5\u4ecb\u7d39"},"content":{"rendered":"<h1 id=\"mysql%e4%bf%ae%e6%94%b9%e8%a1%a8%e7%b5%90%e6%a7%8b%e8%aa%9e%e5%8f%a5%e4%bb%8b%e7%b4%b9-LTAduLXuwG\">MySQL\u4fee\u6539\u8868\u7d50\u69cb\u8a9e\u53e5\u4ecb\u7d39<\/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\u96a8\u8457\u61c9\u7528\u7a0b\u5e8f\u7684\u767c\u5c55\uff0c\u6578\u64da\u5eab\u7684\u7d50\u69cb\u53ef\u80fd\u9700\u8981\u9032\u884c\u8abf\u6574\u3002\u9019\u6642\uff0cMySQL\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684\u8a9e\u53e5\u4f86\u4fee\u6539\u8868\u7684\u7d50\u69cb\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528\u9019\u4e9b\u8a9e\u53e5\u4f86\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u8868\u7684\u7d50\u69cb\u3002<\/p>\n<h2 id=\"1-alter-table%e8%aa%9e%e5%8f%a5%e6%a6%82%e8%bf%b0-LTAduLXuwG\">1. ALTER TABLE\u8a9e\u53e5\u6982\u8ff0<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u4fee\u6539\u8868\u7d50\u69cb\u7684\u4e3b\u8981\u8a9e\u53e5\u662f<code>ALTER TABLE<\/code>\u3002\u9019\u500b\u8a9e\u53e5\u53ef\u4ee5\u7528\u4f86\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u8868\u4e2d\u7684\u5217\uff0c\u751a\u81f3\u53ef\u4ee5\u6539\u8b8a\u8868\u7684\u540d\u7a31\u6216\u5b58\u5132\u5f15\u64ce\u3002<\/p>\n<h2 id=\"2-%e6%b7%bb%e5%8a%a0%e5%88%97-LTAduLXuwG\">2. \u6dfb\u52a0\u5217<\/h2>\n<p>\u8981\u5728\u73fe\u6709\u8868\u4e2d\u6dfb\u52a0\u65b0\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d ADD \u5217\u540d \u6578\u64da\u985e\u578b;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>users<\/code>\u7684\u8868\uff0c\u4e26\u5e0c\u671b\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 ADD age INT;<\/code><\/pre>\n<h2 id=\"3-%e5%88%aa%e9%99%a4%e5%88%97-LTAduLXuwG\">3. \u522a\u9664\u5217<\/h2>\n<p>\u5982\u679c\u9700\u8981\u522a\u9664\u8868\u4e2d\u7684\u67d0\u4e00\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d DROP \u5217\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e<code>users<\/code>\u8868\u4e2d\u522a\u9664<code>age<\/code>\u5217\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users DROP age;<\/code><\/pre>\n<h2 id=\"4-%e4%bf%ae%e6%94%b9%e5%88%97-LTAduLXuwG\">4. \u4fee\u6539\u5217<\/h2>\n<p>\u8981\u4fee\u6539\u73fe\u6709\u5217\u7684\u6578\u64da\u985e\u578b\u6216\u5176\u4ed6\u5c6c\u6027\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d MODIFY \u5217\u540d \u65b0\u6578\u64da\u985e\u578b;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5c07<code>age<\/code>\u5217\u7684\u6578\u64da\u985e\u578b\u6539\u70ba<code>VARCHAR(3)<\/code>\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users MODIFY age VARCHAR(3);<\/code><\/pre>\n<h2 id=\"5-%e9%87%8d%e5%91%bd%e5%90%8d%e5%88%97-LTAduLXuwG\">5. \u91cd\u547d\u540d\u5217<\/h2>\n<p>\u5982\u679c\u9700\u8981\u91cd\u547d\u540d\u67d0\u4e00\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d CHANGE \u820a\u5217\u540d \u65b0\u5217\u540d \u6578\u64da\u985e\u578b;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5c07<code>age<\/code>\u5217\u91cd\u547d\u540d\u70ba<code>user_age<\/code>\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users CHANGE age user_age INT;<\/code><\/pre>\n<h2 id=\"6-%e9%87%8d%e5%91%bd%e5%90%8d%e8%a1%a8-LTAduLXuwG\">6. \u91cd\u547d\u540d\u8868<\/h2>\n<p>\u82e5\u8981\u91cd\u547d\u540d\u6574\u500b\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u820a\u8868\u540d RENAME TO \u65b0\u8868\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5c07<code>users<\/code>\u8868\u91cd\u547d\u540d\u70ba<code>members<\/code>\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users RENAME TO members;<\/code><\/pre>\n<h2 id=\"7-%e6%b7%bb%e5%8a%a0%e7%b4%a2%e5%bc%95-LTAduLXuwG\">7. \u6dfb\u52a0\u7d22\u5f15<\/h2>\n<p>\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u8981\u5728\u8868\u4e2d\u6dfb\u52a0\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d ADD INDEX \u7d22\u5f15\u540d (\u5217\u540d);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5728<code>username<\/code>\u5217\u4e0a\u6dfb\u52a0\u7d22\u5f15\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users ADD INDEX idx_username (username);<\/code><\/pre>\n<h2 id=\"8-%e5%88%aa%e9%99%a4%e7%b4%a2%e5%bc%95-LTAduLXuwG\">8. \u522a\u9664\u7d22\u5f15<\/h2>\n<p>\u82e5\u8981\u522a\u9664\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d DROP INDEX \u7d22\u5f15\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u522a\u9664<code>idx_username<\/code>\u7d22\u5f15\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users DROP INDEX idx_username;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-LTAduLXuwG\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684<code>ALTER TABLE<\/code>\u8a9e\u53e5\u63d0\u4f9b\u4e86\u9748\u6d3b\u7684\u65b9\u5f0f\u4f86\u4fee\u6539\u8868\u7684\u7d50\u69cb\uff0c\u7121\u8ad6\u662f\u6dfb\u52a0\u3001\u522a\u9664\u9084\u662f\u4fee\u6539\u5217\uff0c\u751a\u81f3\u91cd\u547d\u540d\u8868\u548c\u5217\u3002\u9019\u4e9b\u64cd\u4f5c\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u7dad\u8b77\u81f3\u95dc\u91cd\u8981\u3002\u4e86\u89e3\u9019\u4e9b\u57fa\u672c\u8a9e\u6cd5\u5f8c\uff0c\u60a8\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u7ba1\u7406\u60a8\u7684\u6578\u64da\u5eab\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u9748\u6d3b\u7684\u914d\u7f6e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4fee\u6539\u8868\u7d50\u69cb\u7684\u8a9e\u53e5\uff0c\u5305\u62ec\u6dfb\u52a0\u3001\u522a\u9664\u548c\u4fee\u6539\u6b04\u4f4d\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\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-77214","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77214","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=77214"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77214\/revisions"}],"predecessor-version":[{"id":77215,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77214\/revisions\/77215"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=77214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=77214"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=77214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}