{"id":60567,"date":"2024-10-13T03:56:15","date_gmt":"2024-10-12T19:56:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60567\/"},"modified":"2024-10-13T03:56:15","modified_gmt":"2024-10-12T19:56:15","slug":"db2%e5%88%97%e7%9a%84%e4%bf%ae%e6%94%b9%e5%8f%8a%e9%99%90%e5%88%b6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60567\/","title":{"rendered":"DB2\u5217\u7684\u4fee\u6539\u53ca\u9650\u5236"},"content":{"rendered":"<h1 id=\"db2%e5%88%97%e7%9a%84%e4%bf%ae%e6%94%b9%e5%8f%8a%e9%99%90%e5%88%b6-yGnzlzjlVx\">DB2\u5217\u7684\u4fee\u6539\u53ca\u9650\u5236<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cDB2\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u7cfb\u7d71\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u4f01\u696d\u74b0\u5883\u4e2d\u3002\u5c0d\u65bcDB2\u7684\u4f7f\u7528\u8005\u4f86\u8aaa\uff0c\u4e86\u89e3\u5982\u4f55\u4fee\u6539\u8cc7\u6599\u8868\u4e2d\u7684\u5217\u4ee5\u53ca\u76f8\u95dc\u7684\u9650\u5236\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eDB2\u4e2d\u5217\u7684\u4fee\u6539\u65b9\u6cd5\u53ca\u5176\u9650\u5236\u3002<\/p>\n<h2 id=\"db2%e4%b8%ad%e5%88%97%e7%9a%84%e4%bf%ae%e6%94%b9%e6%96%b9%e6%b3%95-yGnzlzjlVx\">DB2\u4e2d\u5217\u7684\u4fee\u6539\u65b9\u6cd5<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u4fee\u6539\u8cc7\u6599\u8868\u7684\u5217\u901a\u5e38\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u5141\u8a31\u4f7f\u7528\u8005\u5c0d\u73fe\u6709\u7684\u8cc7\u6599\u8868\u9032\u884c\u7d50\u69cb\u4e0a\u7684\u8b8a\u66f4\uff0c\u5305\u62ec\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u5217\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u64cd\u4f5c\uff1a<\/p>\n<h3 id=\"1-%e4%bf%ae%e6%94%b9%e5%88%97%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-yGnzlzjlVx\">1. \u4fee\u6539\u5217\u7684\u6578\u64da\u985e\u578b<\/h3>\n<p>\u5982\u679c\u9700\u8981\u6539\u8b8a\u67d0\u4e00\u5217\u7684\u6578\u64da\u985e\u578b\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d ALTER COLUMN \u5217\u540d SET DATA TYPE \u65b0\u6578\u64da\u985e\u578b;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07\u540d\u70ba\u201cage\u201d\u7684\u5217\u5f9e\u6574\u6578\u578b\u6539\u70ba\u6d6e\u9ede\u578b\uff1a<\/p>\n<pre><code>ALTER TABLE users ALTER COLUMN age SET DATA TYPE FLOAT;<\/code><\/pre>\n<h3 id=\"2-%e4%bf%ae%e6%94%b9%e5%88%97%e7%9a%84%e5%90%8d%e7%a8%b1-yGnzlzjlVx\">2. \u4fee\u6539\u5217\u7684\u540d\u7a31<\/h3>\n<p>\u82e5\u8981\u66f4\u6539\u5217\u7684\u540d\u7a31\uff0c\u53ef\u4ee5\u4f7f\u7528RENAME COLUMN\u5b50\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d RENAME COLUMN \u820a\u5217\u540d TO \u65b0\u5217\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07\u201cusername\u201d\u5217\u6539\u70ba\u201cuser_name\u201d\uff1a<\/p>\n<pre><code>ALTER TABLE users RENAME COLUMN username TO user_name;<\/code><\/pre>\n<h3 id=\"3-%e6%b7%bb%e5%8a%a0%e6%96%b0%e5%88%97-yGnzlzjlVx\">3. \u6dfb\u52a0\u65b0\u5217<\/h3>\n<p>\u8981\u5728\u8cc7\u6599\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\u5411\u201cusers\u201d\u8868\u4e2d\u6dfb\u52a0\u4e00\u500b\u201cemail\u201d\u5217\uff1a<\/p>\n<pre><code>ALTER TABLE users ADD email VARCHAR(255);<\/code><\/pre>\n<h3 id=\"4-%e5%88%aa%e9%99%a4%e5%88%97-yGnzlzjlVx\">4. \u522a\u9664\u5217<\/h3>\n<p>\u5982\u679c\u9700\u8981\u522a\u9664\u67d0\u4e00\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528DROP COLUMN\u5b50\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d DROP COLUMN \u5217\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u522a\u9664\u201cage\u201d\u5217\uff1a<\/p>\n<pre><code>ALTER TABLE users DROP COLUMN age;<\/code><\/pre>\n<h2 id=\"db2%e5%88%97%e4%bf%ae%e6%94%b9%e7%9a%84%e9%99%90%e5%88%b6-yGnzlzjlVx\">DB2\u5217\u4fee\u6539\u7684\u9650\u5236<\/h2>\n<p>\u5728\u9032\u884c\u5217\u7684\u4fee\u6539\u6642\uff0cDB2\u6709\u4e00\u4e9b\u9650\u5236\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u5728\u4fee\u6539\u5217\u7684\u6578\u64da\u985e\u578b\u6642\uff0c\u5fc5\u9808\u78ba\u4fdd\u65b0\u985e\u578b\u80fd\u5920\u5bb9\u7d0d\u73fe\u6709\u6578\u64da\uff0c\u5426\u5247\u5c07\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<li><strong>\u5916\u9375\u7d04\u675f\uff1a<\/strong>\u5982\u679c\u5217\u662f\u5916\u9375\u7684\u4e00\u90e8\u5206\uff0c\u5247\u5728\u4fee\u6539\u6216\u522a\u9664\u8a72\u5217\u4e4b\u524d\uff0c\u5fc5\u9808\u5148\u522a\u9664\u76f8\u95dc\u7684\u5916\u9375\u7d04\u675f\u3002<\/li>\n<li><strong>\u7d22\u5f15\u5f71\u97ff\uff1a<\/strong>\u4fee\u6539\u5217\u7684\u6578\u64da\u985e\u578b\u6216\u522a\u9664\u5217\u53ef\u80fd\u6703\u5f71\u97ff\u5230\u7d22\u5f15\uff0c\u9019\u53ef\u80fd\u9700\u8981\u91cd\u65b0\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong>\u5c0d\u65bc\u5927\u578b\u8cc7\u6599\u8868\uff0c\u4fee\u6539\u5217\u7684\u64cd\u4f5c\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u7279\u5225\u662f\u5728\u57f7\u884c\u5927\u91cf\u6578\u64da\u7684\u60c5\u6cc1\u4e0b\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-yGnzlzjlVx\">\u7d50\u8ad6<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u5217\u7684\u4fee\u6539\u662f\u4e00\u500b\u91cd\u8981\u7684\u64cd\u4f5c\uff0c\u80fd\u5920\u5e6b\u52a9\u4f7f\u7528\u8005\u6839\u64da\u9700\u6c42\u8abf\u6574\u8cc7\u6599\u8868\u7684\u7d50\u69cb\u3002\u7136\u800c\uff0c\u9032\u884c\u9019\u4e9b\u4fee\u6539\u6642\u5fc5\u9808\u8b39\u614e\uff0c\u4e26\u8003\u616e\u5230\u6578\u64da\u5b8c\u6574\u6027\u3001\u5916\u9375\u7d04\u675f\u3001\u7d22\u5f15\u5f71\u97ff\u53ca\u6027\u80fd\u7b49\u56e0\u7d20\u3002\u4e86\u89e3\u9019\u4e9b\u57fa\u672c\u64cd\u4f5c\u548c\u9650\u5236\uff0c\u5c07\u6709\u52a9\u65bc\u66f4\u6709\u6548\u5730\u7ba1\u7406DB2\u8cc7\u6599\u5eab\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3\u6709\u95dc<em><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/em>\u53ca<em><a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a><\/em>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3DB2\u4e2d\u5217\u7684\u4fee\u6539\u65b9\u6cd5\u53ca\u5176\u9650\u5236\uff0c\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\u4e0e\u6027\u80fd\u4f18\u5316\uff0c\u63d0\u5347\u6570\u636e\u5e93\u7ba1\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-60567","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60567","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=60567"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60567\/revisions"}],"predecessor-version":[{"id":60568,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60567\/revisions\/60568"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60567"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60567"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60567"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}