{"id":172571,"date":"2024-11-07T14:14:23","date_gmt":"2024-11-07T06:14:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172571\/"},"modified":"2024-11-07T14:14:24","modified_gmt":"2024-11-07T06:14:24","slug":"%e5%a6%82%e4%bd%95%e6%93%8d%e4%bd%9c%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e8%a1%a8%e6%a0%bc%e4%bf%ae%e6%94%b9%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab-%e4%bf%ae%e6%94%b9-%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172571\/","title":{"rendered":"\u5982\u4f55\u64cd\u4f5c\u6578\u64da\u5eab\u4e2d\u7684\u8868\u683c\u4fee\u6539\uff1f (\u6578\u64da\u5eab \u4fee\u6539 \u8868)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e6%93%8d%e4%bd%9c%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e8%a1%a8%e6%a0%bc%e4%bf%ae%e6%94%b9%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab-%e4%bf%ae%e6%94%b9-%e8%a1%a8-XULzDYWcxw\">\u5982\u4f55\u64cd\u4f5c\u6578\u64da\u5eab\u4e2d\u7684\u8868\u683c\u4fee\u6539\uff1f (\u6578\u64da\u5eab \u4fee\u6539 \u8868)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u8868\u683c\u7684\u4fee\u6539\u662f\u4e00\u9805\u5e38\u898b\u4e14\u91cd\u8981\u7684\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u6dfb\u52a0\u65b0\u6b04\u4f4d\u3001\u522a\u9664\u4e0d\u5fc5\u8981\u7684\u6b04\u4f4d\uff0c\u9084\u662f\u66f4\u65b0\u73fe\u6709\u6578\u64da\uff0c\u9019\u4e9b\u64cd\u4f5c\u90fd\u9700\u8981\u8b39\u614e\u9032\u884c\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u9032\u884c\u8868\u683c\u7684\u4fee\u6539\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e6%a0%bc%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-XULzDYWcxw\">\u6578\u64da\u5eab\u8868\u683c\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u6578\u64da\u5eab\u8868\u683c\u662f\u7528\u4f86\u5b58\u5132\u6578\u64da\u7684\u7d50\u69cb\u5316\u683c\u5f0f\u3002\u6bcf\u500b\u8868\u683c\u7531\u884c\u548c\u5217\u7d44\u6210\uff0c\u5176\u4e2d\u884c\u4ee3\u8868\u8a18\u9304\uff0c\u5217\u5247\u4ee3\u8868\u5c6c\u6027\u3002\u5c0d\u65bc\u95dc\u4fc2\u578b\u6578\u64da\u5eab\uff08\u5982 MySQL\u3001PostgreSQL \u7b49\uff09\uff0c\u8868\u683c\u7684\u8a2d\u8a08\u548c\u4fee\u6539\u5c0d\u65bc\u6578\u64da\u7684\u7ba1\u7406\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e4%bf%ae%e6%94%b9%e8%a1%a8%e6%a0%bc%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%93%8d%e4%bd%9c-XULzDYWcxw\">\u4fee\u6539\u8868\u683c\u7684\u57fa\u672c\u64cd\u4f5c<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u4fee\u6539\u8868\u683c\u7684\u64cd\u4f5c\u4e3b\u8981\u901a\u904e SQL \u8a9e\u53e5\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u4fee\u6539\u64cd\u4f5c\uff1a<\/p>\n<h3 id=\"1-%e6%b7%bb%e5%8a%a0%e6%96%b0%e6%ac%84%e4%bd%8d-XULzDYWcxw\">1. \u6dfb\u52a0\u65b0\u6b04\u4f4d<\/h3>\n<p>\u8981\u5728\u8868\u683c\u4e2d\u6dfb\u52a0\u65b0\u6b04\u4f4d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d ADD \u6b04\u4f4d\u540d \u6b04\u4f4d\u985e\u578b;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u5728\u540d\u70ba <code>users<\/code> \u7684\u8868\u4e2d\u6dfb\u52a0\u4e00\u500b\u540d\u70ba <code>age<\/code> \u7684\u6574\u6578\u6b04\u4f4d\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>ALTER TABLE users ADD age INT;<\/code><\/pre>\n<h3 id=\"2-%e5%88%aa%e9%99%a4%e6%ac%84%e4%bd%8d-XULzDYWcxw\">2. \u522a\u9664\u6b04\u4f4d<\/h3>\n<p>\u5982\u679c\u67d0\u500b\u6b04\u4f4d\u4e0d\u518d\u9700\u8981\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u522a\u9664\u5b83\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d DROP COLUMN \u6b04\u4f4d\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u522a\u9664 <code>users<\/code> \u8868\u4e2d\u7684 <code>age<\/code> \u6b04\u4f4d\uff1a<\/p>\n<pre><code>ALTER TABLE users DROP COLUMN age;<\/code><\/pre>\n<h3 id=\"3-%e4%bf%ae%e6%94%b9%e6%ac%84%e4%bd%8d%e9%a1%9e%e5%9e%8b-XULzDYWcxw\">3. \u4fee\u6539\u6b04\u4f4d\u985e\u578b<\/h3>\n<p>\u6709\u6642\u5019\u9700\u8981\u4fee\u6539\u6b04\u4f4d\u7684\u6578\u64da\u985e\u578b\uff0c\u9019\u4e5f\u53ef\u4ee5\u901a\u904e <code>ALTER TABLE<\/code> \u8a9e\u53e5\u4f86\u5be6\u73fe\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d MODIFY \u6b04\u4f4d\u540d \u65b0\u6b04\u4f4d\u985e\u578b;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07 <code>users<\/code> \u8868\u4e2d\u7684 <code>username<\/code> \u6b04\u4f4d\u7684\u985e\u578b\u5f9e <code>VARCHAR(50)<\/code> \u4fee\u6539\u70ba <code>VARCHAR(100)<\/code>\uff1a<\/p>\n<pre><code>ALTER TABLE users MODIFY username VARCHAR(100);<\/code><\/pre>\n<h3 id=\"4-%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a-XULzDYWcxw\">4. \u66f4\u65b0\u6578\u64da<\/h3>\n<p>\u9664\u4e86\u7d50\u69cb\u4e0a\u7684\u4fee\u6539\uff0c\u9084\u9700\u8981\u5b9a\u671f\u66f4\u65b0\u8868\u4e2d\u7684\u6578\u64da\u3002\u9019\u53ef\u4ee5\u901a\u904e <code>UPDATE<\/code> \u8a9e\u53e5\u4f86\u5b8c\u6210\uff1a<\/p>\n<pre><code>UPDATE \u8868\u540d SET \u6b04\u4f4d\u540d = \u65b0\u503c WHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07 <code>users<\/code> \u8868\u4e2d\u7528\u6236 ID \u70ba 1 \u7684\u7528\u6236\u7684\u540d\u7a31\u66f4\u65b0\u70ba <code>John Doe<\/code>\uff1a<\/p>\n<pre><code>UPDATE users SET username = 'John Doe' WHERE id = 1;<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-XULzDYWcxw\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u5728\u9032\u884c\u4efb\u4f55\u4fee\u6539\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u6578\u64da\u5eab\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<li>\u5728\u4fee\u6539\u8868\u7d50\u69cb\u6642\uff0c\u61c9\u8003\u616e\u5230\u73fe\u6709\u6578\u64da\u7684\u517c\u5bb9\u6027\uff0c\u907f\u514d\u9020\u6210\u6578\u64da\u932f\u8aa4\u3002<\/li>\n<li>\u5c0d\u65bc\u5927\u578b\u6578\u64da\u5eab\uff0c\u4fee\u6539\u8868\u7d50\u69cb\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u5efa\u8b70\u5728\u4f4e\u5cf0\u6642\u6bb5\u9032\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-XULzDYWcxw\">\u7e3d\u7d50<\/h2>\n<p>\u6578\u64da\u5eab\u4e2d\u7684\u8868\u683c\u4fee\u6539\u662f\u4e00\u9805\u57fa\u672c\u800c\u91cd\u8981\u7684\u6280\u80fd\uff0c\u7121\u8ad6\u662f\u6dfb\u52a0\u3001\u522a\u9664\u9084\u662f\u66f4\u65b0\u6b04\u4f4d\uff0c\u90fd\u9700\u8981\u8b39\u614e\u64cd\u4f5c\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528 SQL \u8a9e\u53e5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u548c\u7dad\u8b77\u6578\u64da\u5eab\u7684\u7d50\u69cb\u548c\u5167\u5bb9\u3002\u5982\u679c\u60a8\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u5eab\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\">\u4e91\u670d\u52a1\u5668<\/a>\uff0c\u4ee5\u4fbf\u66f4\u597d\u5730\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u6709\u6548\u5730\u4fee\u6539\u8868\u683c\uff0c\u5305\u62ec\u6dfb\u52a0\u3001\u522a\u9664\u548c\u66f4\u65b0\u6578\u64da\u7684\u6b65\u9a5f\u8207\u6280\u5de7\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-172571","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172571","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=172571"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172571\/revisions"}],"predecessor-version":[{"id":172572,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172571\/revisions\/172572"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172571"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172571"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172571"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}