{"id":26522,"date":"2024-11-24T08:48:59","date_gmt":"2024-11-24T00:48:59","guid":{"rendered":"https:\/\/fwq.ai\/blog\/26522\/"},"modified":"2024-11-24T08:48:59","modified_gmt":"2024-11-24T00:48:59","slug":"mysql-%e9%bb%98%e8%ae%a4%e5%80%bc%e6%b7%bb%e5%8a%a0%e5%bc%95%e5%8f%b7%e7%9a%84%e8%a7%84%e5%88%99%ef%bc%9a%e4%bd%95%e6%97%b6%e9%9c%80%e8%a6%81%e6%b7%bb%e5%8a%a0%e5%bc%95%e5%8f%b7%ef%bc%9f-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/26522\/","title":{"rendered":"MySQL \u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219\uff1a\u4f55\u65f6\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173097378418573.jpg\" class=\"aligncenter\" title=\"MySQL \u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219\uff1a\u4f55\u65f6\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\uff1f\u63d2\u56fe\" alt=\"MySQL \u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219\uff1a\u4f55\u65f6\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong> \u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219<\/strong><\/p>\n<p>\u5728 mysql \u4e2d\u8bbe\u7f6e\u5217\u7684\u9ed8\u8ba4\u503c\u65f6\uff0c\u662f\u5426\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\u53d6\u51b3\u4e8e\u8be5\u5b57\u6bb5\u7684\u6570\u636e\u7c7b\u578b\uff1a<\/p>\n<ul>\n<li> <strong>\u5b57\u7b26\u4e32\u7c7b\u578b\uff08char\/varchar\/text\/blob \u7b49\uff09<\/strong>\uff1a\u9700\u8981\u6dfb\u52a0\u5355\u5f15\u53f7\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre>alter table table_name add column_name varchar(255) default 'my_default_value';<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<ul>\n<li> <strong>\u975e\u5b57\u7b26\u4e32\u7c7b\u578b\uff08int\/datetime\/decimal \u7b49\uff09<\/strong>\uff1a\u4e0d\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre>alter table table_name add column_name int default 3600;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u539f\u56e0\u662f\uff0c\u5b57\u7b26\u4e32\u7c7b\u578b\u503c\u5fc5\u987b\u7528\u5f15\u53f7\u62ec\u8d77\u6765\uff0c\u800c\u6570\u5b57\u548c\u65e5\u671f\u7b49\u975e\u5b57\u7b26\u4e32\u7c7b\u578b\u503c\u5219\u4e0d\u9700\u8981\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6839\u636e\u60a8\u7ed9\u51fa\u7684\u793a\u4f8b\uff0c\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u8bbe\u7f6e\u975e\u5b57\u7b26\u4e32\u7c7b\u578b\uff08bigint unsigned\uff09\u7684\u9ed8\u8ba4\u503c\u4e3a 3600 \u662f\u6b63\u786e\u7684\uff1a<\/p>\n<pre>ALTER TABLE qra_works ADD upgraded_time BIGINT UNSIGNED NOT NULL DEFAULT 3600 AFTER created_time;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fMySQL \u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219\uff1a\u4f55\u65f6\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219 \u5728 mysql \u4e2d\u8bbe\u7f6e\u5217\u7684\u9ed8\u8ba4\u503c\u65f6\uff0c\u662f\u5426\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\u53d6\u51b3\u4e8e\u8be5\u5b57\u6bb5\u7684\u6570\u636e\u7c7b\u578b\uff1a \u5b57\u7b26\u4e32\u7c7b\u578b\uff08char\/varchar\/text\/blob \u7b49\uff09\uff1a\u9700\u8981\u6dfb\u52a0\u5355\u5f15\u53f7\u3002\u4f8b\u5982\uff1a alter table table_name add column_name varchar(255) default &#8216;my_default_value&#8217;; \u767b\u5f55\u540e\u590d\u5236 \u975e\u5b57\u7b26\u4e32\u7c7b\u578b\uff08int\/datetime\/decimal \u7b49\uff09\uff1a\u4e0d\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\u3002\u4f8b\u5982\uff1a alter table table_name add column_name int default 3600; \u767b\u5f55\u540e\u590d\u5236 \u539f\u56e0\u662f\uff0c\u5b57\u7b26\u4e32\u7c7b\u578b\u503c\u5fc5\u987b\u7528\u5f15\u53f7\u62ec\u8d77\u6765\uff0c\u800c\u6570\u5b57\u548c\u65e5\u671f\u7b49\u975e\u5b57\u7b26\u4e32\u7c7b\u578b\u503c\u5219\u4e0d\u9700\u8981\u3002 \u56e0\u6b64\uff0c\u6839\u636e\u60a8\u7ed9\u51fa\u7684\u793a\u4f8b\uff0c\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u8bbe\u7f6e\u975e\u5b57\u7b26\u4e32\u7c7b\u578b\uff08bigint unsigned\uff09\u7684\u9ed8\u8ba4\u503c\u4e3a 3600 \u662f\u6b63\u786e\u7684\uff1a ALTER TABLE qra_works ADD upgraded_time BIGINT UNSIGNED NOT NULL DEFAULT 3600 AFTER created_time; \u767b\u5f55\u540e\u590d\u5236 \u4ee5\u4e0a\u5c31\u662fMySQL \u9ed8\u8ba4\u503c\u6dfb\u52a0\u5f15\u53f7\u7684\u89c4\u5219\uff1a\u4f55\u65f6\u9700\u8981\u6dfb\u52a0\u5f15\u53f7\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-26522","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/26522","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=26522"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/26522\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=26522"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=26522"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=26522"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}