\u6570\u636e\u91cf\u5927\u3001\u5e76\u53d1\u91cf\u9ad8\u573a\u666f\uff0c\u5982\u4f55\u5728\u6d41\u91cf\u4f4e\u5cf0\u671f\uff0c\u5e73\u6ed1\u5b9e\u65bd\u8868\u7ed3\u6784\u53d8\u66f4?\u4efb\u4f55\u8131\u79bb\u4e1a\u52a1\u7684\u67b6\u6784\u8bbe\u8ba1\u90fd\u662f\u800d\u6d41\u6c13\u3002
\n\u7ee7\u7eed\u56de\u7b54\u77e5\u8bc6\u661f\u7403\u6c34\u53cb\u63d0\u95ee\u3002
\n $\"\"$
\n\u95ee\u9898\u57df\uff1a\u6570\u636e\u91cf\u5927\u3001\u5e76\u53d1\u91cf\u9ad8\u573a\u666f\uff0c\u5982\u4f55\u5728\u6d41\u91cf\u4f4e\u5cf0\u671f\uff0c\u5e73\u6ed1\u5b9e\u65bd\u8868\u7ed3\u6784\u53d8\u66f4?<\/p>\n

\u753b\u5916\u97f3\uff0c\u4e00\u822c\u6765\u8bf4\uff0c\u662f\u6307\u589e\u52a0\u8868\u7684\u5c5e\u6027\uff0c\u56e0\u4e3a\uff1a<\/p>\n

\u5982\u679c\u662f\u51cfcolumn\uff0c\u5347\u7ea7\u7a0b\u5e8f\u4e0d\u4f7f\u7528\u5373\u53ef;
\n\u5982\u679c\u662f\u4fee\u6539column\uff0c\u7a0b\u5e8f\u517c\u5bb9\u6027\u5bb9\u6613\u51fa\u95ee\u9898;
\n\u9996\u5148\uff0c\u4e00\u8d77\u770b\u4e0b\u6709\u54ea\u4e9b\u5e38\u89c1\u65b9\u6848\u3002<\/p>\n

\u65b9\u6848\u4e00\uff1a\u5728\u7ebf\u4fee\u6539\u8868\u7ed3\u6784\u3002<\/strong><\/span><\/div>\n
\u753b\u5916\u97f3\uff1aalter table add column<\/p>\n
\u6570\u636e\u91cf\u5927\u7684\u60c5\u51b5\u4e0b\uff0c\u9501\u8868\u65f6\u95f4\u4f1a\u8f83\u957f\uff0c\u9020\u6210\u62d2\u7edd\u670d\u52a1\uff0c\u4e00\u822c\u4e0d\u53ef\u884c\u3002<\/p>\n
\u65b9\u6848\u4e8c\uff1a\u901a\u8fc7\u589e\u52a0\u8868\u7684\u65b9\u5f0f\u6269\u5c55\u5c5e\u6027\uff0c\u901a\u8fc7\u5916\u952ejoin\u6765\u67e5\u8be2\u3002<\/strong><\/span><\/div>\n
\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5bf9\uff1a<\/p>\n
t_user(uid, c1, c2, c3)
\n\u60f3\u8981\u6269\u5c55\u5c5e\u6027\uff0c\u53ef\u4ee5\u901a\u8fc7\u589e\u52a0\u4e00\u4e2a\u8868\u5b9e\u73b0\uff1a<\/p>\n
t_user_ex(uid, c4, c5, c6)
\n\u6570\u636e\u91cf\u5927\u7684\u60c5\u51b5\u4e0b\uff0cjoin\u6027\u80fd\u8f83\u5dee\uff0c\u4e00\u822c\u4e0d\u53ef\u884c\u3002<\/p>\n
\u65b9\u6848\u4e09\uff0c\u901a\u8fc7\u589e\u52a0\u8868\u7684\u65b9\u5f0f\u6269\u5c55\uff0c\u901a\u8fc7\u89c6\u56fe\u6765\u5c4f\u853d\u5e95\u5c42\u590d\u6742\u6027\u3002<\/strong><\/span><\/div>\n
\u540c\u4e0a\uff0c\u89c6\u56fe\u6548\u7387\u8f83\u4f4e\uff0c\u4e00\u822c\u4e0d\u4f7f\u7528\u89c6\u56fe\u3002<\/p>\n
\u753b\u5916\u97f3\uff1a\u81f3\u5c1158\u5230\u5bb6\u7981\u6b62\u4f7f\u7528\u89c6\u56fe\u3002<\/p>\n
\u65b9\u6848\u56db\uff0c\u63cd\u4ea7\u54c1\u7ecf\u7406\uff0c\u963b\u6b62\u5979\u4fee\u6539\u9700\u6c42\u3002<\/strong><\/span><\/div>\n
\u65b9\u6848\u4e94\uff0c\u63d0\u524d\u9884\u7559\u4e00\u4e9breserved\u5b57\u6bb5\uff0c\u52a0\u5217\u53ef\u590d\u7528\u8fd9\u4e9b\u5b57\u6bb5\u3002<\/strong><\/span><\/div>\n
\u8fd9\u4e2a\u65b9\u6848\u53ef\u884c\uff0c\u4f46\u5982\u679c\u9884\u7559\u8fc7\u591a\uff0c\u4f1a\u9020\u6210\u7a7a\u95f4\u6d6a\u8d39\u3002<\/p>\n
\u65b9\u6848\u516d\uff0cpt-online-schema-change<\/strong><\/span><\/div>\n
\u5bf9\u4e8eMySQL\u800c\u8a00\uff0c\u8fd9\u662f\u76ee\u524d\u6bd4\u8f83\u6210\u719f\u7684\u65b9\u6848\uff0c\u88ab\u5e7f\u5927\u516c\u53f8\u6240\u4f7f\u7528\u3002<\/p>\n
\u753b\u5916\u97f3\uff1a\u6211\u5446\u8fc7\u7684\u4e92\u8054\u7f51\u516c\u53f8\uff0c\u6570\u636e\u5e93\u5747\u4f7f\u7528MySQL\u3002<\/p>\n
\u4e0b\u9762\u4ecd\u4ee5\u7528\u6237\u8868\u6269\u5c55\u4e3a\u4f8b\uff0c\u8bf4\u4e0b\u8fd9\u4e2a\u5de5\u5177\u5185\u90e8\u7684\u539f\u7406\u4e0e\u6b65\u9aa4\u3002<\/p>\n
\u5047\u8bbe\uff1a<\/p>\n
user(uid, name, passwd) <\/pre>\n
\u8981\u6269\u5c55\u5230\uff1a<\/p>\n
user(uid, name, passwd, age, sex) <\/pre>\n
\u7b2c\u4e00\u6b65\uff0c\u5148\u521b\u5efa\u4e00\u4e2a\u6269\u5145\u5b57\u6bb5\u540e\u7684\u65b0\u8868\uff1a<\/p>\n
user_new(uid, name, passwd, age, sex) <\/pre>\n
\u753b\u5916\u97f3\uff1a\u5c31\u662f\u88ab\u6269\u5c55\u540e\u7684\u8868\u3002<\/p>\n
\u7b2c\u4e8c\u6b65\uff0c\u5728\u539f\u8868user\u4e0a\u521b\u5efa\u4e09\u4e2a\u89e6\u53d1\u5668\uff0c\u5bf9\u539f\u8868user\u8fdb\u884c\u7684\u6240\u6709insert\/delete\/update\u64cd\u4f5c\uff0c\u90fd\u4f1a\u5bf9\u65b0\u8868user_new\u8fdb\u884c\u76f8\u540c\u7684\u64cd\u4f5c;<\/p>\n
\u7b2c\u4e09\u6b65\uff0c\u5206\u6279\u5c06\u539f\u8868user\u4e2d\u7684\u6570\u636einsert\u5230\u65b0\u8868user_new\uff0c\u76f4\u81f3\u6570\u636e\u8fc1\u79fb\u5b8c\u6210;<\/p>\n
\u7b2c\u56db\u6b65\uff0c\u5220\u6389\u89e6\u53d1\u5668\uff0c\u628a\u539f\u8868\u79fb\u8d70(\u9ed8\u8ba4\u662fdrop\u6389);<\/p>\n
\u7b2c\u4e94\u6b65\uff0c\u628a\u65b0\u8868user_new\u91cd\u547d\u540d(rename)\u6210\u539f\u8868user;<\/p>\n
\u6269\u5145\u5b57\u6bb5\u5b8c\u6210\uff0c\u6574\u4e2a\u8fc7\u7a0b\u4e0d\u9700\u8981\u9501\u8868\uff0c\u53ef\u4ee5\u6301\u7eed\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\u3002<\/p>\n
\u64cd\u4f5c\u8fc7\u7a0b\u4e2d\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n
\u53d8\u66f4\u8fc7\u7a0b\u4e2d\uff0c\u6700\u91cd\u8981\u7684\u662f\u51b2\u7a81\u7684\u5904\u7406\uff0c\u4e00\u6761\u539f\u5219\uff0c\u4ee5\u89e6\u53d1\u5668\u7684\u65b0\u6570\u636e\u4e3a\u51c6\uff0c\u8fd9\u5c31\u8981\u6c42\u88ab\u8fc1\u79fb\u7684\u8868\u5fc5\u987b\u6709\u4e3b\u952e(\u8fd9\u4e2a\u8981\u6c42\u57fa\u672c\u90fd\u6ee1\u8db3);
\n\u53d8\u66f4\u8fc7\u7a0b\u4e2d\uff0c\u5199\u64cd\u4f5c\u9700\u8981\u5efa\u7acb\u89e6\u53d1\u5668\uff0c\u6240\u4ee5\u5982\u679c\u539f\u8868\u5df2\u7ecf\u6709\u5f88\u591a\u89e6\u53d1\u5668\uff0c\u65b9\u6848\u5c31\u4e0d\u884c(\u4e92\u8054\u7f51\u5927\u6570\u636e\u9ad8\u5e76\u53d1\u7684\u5728\u7ebf\u4e1a\u52a1\uff0c\u4e00\u822c\u90fd\u7981\u6b62\u4f7f\u7528\u89e6\u53d1\u5668);
\n\u89e6\u53d1\u5668\u7684\u5efa\u7acb\uff0c\u4f1a\u5f71\u54cd\u539f\u8868\u7684\u6027\u80fd\uff0c\u6240\u4ee5\u8fd9\u4e2a\u64cd\u4f5c\u5fc5\u987b\u5728\u6d41\u91cf\u4f4e\u5cf0\u671f\u8fdb\u884c;
\npt-online-schema-change\u662fDBA\u5fc5\u5907\u7684\u5229\u5668\uff0c\u6bd4\u8f83\u6210\u719f\uff0c\u5728\u4e92\u8054\u7f51\u516c\u53f8\u4f7f\u7528\u5e7f\u6cdb\uff0c\u8981\u4e86\u89e3\u66f4\u8be6\u7ec6\u7684\u7ec6\u8282\uff0c\u4ea6\u53ef\u4ee5Google\u4e00\u4e0b\u3002<\/p>\n
\u4efb\u4f55\u8131\u79bb\u4e1a\u52a1\u7684\u67b6\u6784\u8bbe\u8ba1\u90fd\u662f\u800d\u6d41\u6c13\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6570\u636e\u91cf\u5927\u3001\u5e76\u53d1\u91cf\u9ad8\u573a\u666f\uff0c\u5982\u4f55\u5728\u6d41\u91cf\u4f4e\u5cf0\u671f\uff0c\u5e73\u6ed1\u5b9e\u65bd\u8868\u7ed3\u6784\u53d8\u66f4?\u4efb\u4f55\u8131\u79bb\u4e1a\u52a1\u7684\u67b6\u6784\u8bbe\u8ba1\u90fd\u662f\u800d\u6d41\u6c13\u3002 \u7ee7\u7eed\u56de\u7b54\u77e5\u8bc6 […]<\/p>\n","protected":false},"author":63,"featured_media":159599,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-159595","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thread"],"acf":[],"_links":{"self":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/159595","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/users\/63"}],"replies":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/comments?post=159595"}],"version-history":[{"count":5,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/159595\/revisions"}],"predecessor-version":[{"id":160427,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/159595\/revisions\/160427"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media\/159599"}],"wp:attachment":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media?parent=159595"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/categories?post=159595"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/tags?post=159595"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}