{"id":5496,"date":"2024-11-14T10:59:10","date_gmt":"2024-11-14T02:59:10","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5496\/"},"modified":"2024-11-14T10:59:10","modified_gmt":"2024-11-14T02:59:10","slug":"mysql%e6%80%8e%e4%b9%88%e4%bf%ae%e6%94%b9%e8%a1%a8%e7%bb%93%e6%9e%84","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5496\/","title":{"rendered":"mysql\u600e\u4e48\u4fee\u6539\u8868\u7ed3\u6784"},"content":{"rendered":"<blockquote><p>\n  \u8981\u4fee\u6539 mysql \u8868\u7ed3\u6784\uff0c\u53ef\u4ee5\u4f7f\u7528 alter table \u8bed\u53e5\uff0c\u5177\u4f53\u6b65\u9aa4\u5305\u62ec\uff1a\u6307\u5b9a\u8868\u540d\u548c\u4fee\u6539\u5b57\u6bb5\uff1aalter table table_name modify column_name new_data_type\u3002\u6dfb\u52a0\u6216\u5220\u9664\u5b57\u6bb5\uff1aalter table table_name add column new_column_name data_type \u6216 drop column column_name\u3002\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\uff1aalter table table_name change old_column_n\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/29\/2024052904392775988.jpg\" class=\"aligncenter\" title=\"mysql\u600e\u4e48\u4fee\u6539\u8868\u7ed3\u6784\u63d2\u56fe\" alt=\"mysql\u600e\u4e48\u4fee\u6539\u8868\u7ed3\u6784\u63d2\u56fe\" \/><\/p>\n<p><strong>MySQL \u4fee\u6539\u8868\u7ed3\u6784<\/strong><\/p>\n<p><strong>\u5982\u4f55\u4fee\u6539\u8868\u7ed3\u6784\uff1f<\/strong><\/p>\n<p>\u8981\u4fee\u6539 MySQL \u8868\u7ed3\u6784\uff0c\u53ef\u4ee5\u4f7f\u7528 ALTER TABLE \u8bed\u53e5\u3002<\/p>\n<p><strong>\u8be6\u7ec6\u6b65\u9aa4\uff1a<\/strong><\/p>\n<p><strong>1. \u6307\u5b9a\u8868\u540d\u548c\u8981\u4fee\u6539\u7684\u5b57\u6bb5<\/strong><\/p>\n<p>ALTER TABLE table_name MODIFY column_name new_data_type;<\/p>\n<p>\u793a\u4f8b\uff1a\u5c06 users \u8868\u4e2d\u7684 age \u5b57\u6bb5\u7c7b\u578b\u4ece INT \u4fee\u6539\u4e3a VARCHAR(255)\uff1a<\/p>\n<pre>ALTER TABLE users MODIFY age VARCHAR(255);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u6dfb\u52a0\u6216\u5220\u9664\u5b57\u6bb5<\/strong><\/p>\n<ul>\n<li> <strong>\u6dfb\u52a0\u5b57\u6bb5\uff1a<\/strong> ALTER TABLE table_name ADD COLUMN new_column_name data_type;<\/li>\n<li> <strong>\u5220\u9664\u5b57\u6bb5\uff1a<\/strong> ALTER TABLE table_name DROP COLUMN column_name;<\/li>\n<\/ul>\n<p>\u793a\u4f8b\uff1a\u5728 orders \u8868\u4e2d\u6dfb\u52a0 shipping_address \u5b57\u6bb5\uff1a<\/p>\n<pre>ALTER TABLE orders ADD COLUMN shipping_address VARCHAR(255);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>3. \u4fee\u6539\u5b57\u6bb5\u7c7b\u578b<\/strong><\/p>\n<p>\u9664\u4e86\u4e0a\u9762\u63d0\u5230\u7684 MODIFY \u5b50\u53e5\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528 CHANGE \u5b50\u53e5\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\uff1a<\/p>\n<p>ALTER TABLE table_name CHANGE old_column_name new_column_name new_data_type;<\/p>\n<p>\u793a\u4f8b\uff1a\u5c06 customers \u8868\u4e2d\u7684 email \u5b57\u6bb5\u7c7b\u578b\u4ece VARCHAR(255) \u4fee\u6539\u4e3a TEXT\uff1a<\/p>\n<pre>ALTER TABLE customers CHANGE email email TEXT;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>4. \u91cd\u547d\u540d\u5b57\u6bb5<\/strong><\/p>\n<p>ALTER TABLE table_name RENAME COLUMN old_column_name TO new_column_name;<\/p>\n<p>\u793a\u4f8b\uff1a\u5c06 products \u8868\u4e2d\u7684 product_name \u5b57\u6bb5\u91cd\u547d\u540d\u4e3a title\uff1a<\/p>\n<pre>ALTER TABLE products RENAME COLUMN product_name TO title;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n<ul>\n<li>\u4fee\u6539\u8868\u7ed3\u6784\u53ef\u80fd\u4f1a\u5f71\u54cd\u6570\u636e\u5b8c\u6574\u6027\u548c\u5e94\u7528\u7a0b\u5e8f\u7684\u884c\u4e3a\u3002<\/li>\n<li>\u5728\u4fee\u6539\u8868\u7ed3\u6784\u4e4b\u524d\uff0c\u5efa\u8bae\u8fdb\u884c\u5907\u4efd\u3002<\/li>\n<li>\u5bf9\u4e8e\u590d\u6742\u6216\u6d89\u53ca\u5927\u91cf\u6570\u636e\u7684\u66f4\u6539\uff0c\u8bf7\u8003\u8651\u4f7f\u7528\u4e8b\u52a1\u4ee5\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u4fee\u6539\u8868\u7ed3\u6784\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8981\u4fee\u6539 mysql \u8868\u7ed3\u6784\uff0c\u53ef\u4ee5\u4f7f\u7528 alter table \u8bed\u53e5\uff0c\u5177\u4f53\u6b65\u9aa4\u5305\u62ec\uff1a\u6307\u5b9a\u8868\u540d\u548c\u4fee\u6539\u5b57\u6bb5\uff1aalter table table_name modify column_name new_data_type\u3002\u6dfb\u52a0\u6216\u5220\u9664\u5b57\u6bb5\uff1aalter table table_name add column new_column_name data_type \u6216 drop column column_name\u3002\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\uff1aalter table table_name change old_column_n MySQL \u4fee\u6539\u8868\u7ed3\u6784 \u5982\u4f55\u4fee\u6539\u8868\u7ed3\u6784\uff1f \u8981\u4fee\u6539 MySQL \u8868\u7ed3\u6784\uff0c\u53ef\u4ee5\u4f7f\u7528 ALTER TABLE \u8bed\u53e5\u3002 \u8be6\u7ec6\u6b65\u9aa4\uff1a 1. \u6307\u5b9a\u8868\u540d\u548c\u8981\u4fee\u6539\u7684\u5b57\u6bb5 ALTER TABLE table_name MODIFY column_name new_data_type; \u793a\u4f8b\uff1a\u5c06 users \u8868\u4e2d\u7684 age \u5b57\u6bb5\u7c7b\u578b\u4ece INT \u4fee\u6539\u4e3a VARCHAR(255)\uff1a ALTER TABLE users MODIFY [&hellip;]<\/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-5496","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5496","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=5496"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5496\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5496"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}