{"id":6284,"date":"2024-11-14T10:00:08","date_gmt":"2024-11-14T02:00:08","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6284\/"},"modified":"2024-11-14T10:00:08","modified_gmt":"2024-11-14T02:00:08","slug":"%e8%af%a6%e8%a7%a3mysql%e8%af%ad%e5%8f%a5%e4%b8%ad%e7%9a%84ddl","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6284\/","title":{"rendered":"\u8be6\u89e3MySQL\u8bed\u53e5\u4e2d\u7684DDL"},"content":{"rendered":"<blockquote><p>\n  mysql \u4e2d\u7684 ddl\uff08\u6570\u636e\u5b9a\u4e49\u8bed\u8a00\uff09\u662f\u4e00\u7cfb\u5217\u7528\u4e8e\u521b\u5efa\u3001\u4fee\u6539\u548c\u5220\u9664\u6570\u636e\u5e93\u5bf9\u8c61\u7684\u8bed\u53e5\uff0c\u672c\u8d28\u4e0a\u5b9a\u4e49\u4e86\u6570\u636e\u5e93\u7684\u7ed3\u6784\u548c\u5185\u5bb9\u3002\u8fd9\u4e9b\u8bed\u53e5\u5305\u62ec\uff1acreate\uff1a\u521b\u5efa\u65b0\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u8868\u3001\u89c6\u56fe\u548c\u7d22\u5f15\u3002alter\uff1a\u4fee\u6539\u73b0\u6709\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u6dfb\u52a0\u6216\u5220\u9664\u5217\u3001\u66f4\u6539\u6570\u636e\u7c7b\u578b\u6216\u6dfb\u52a0\u7ea6\u675f\u3002drop\uff1a\u5220\u9664\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u8868\u548c\u89c6\u56fe\u3002ddl \u8bed\u53e5\u6309\u987a\u5e8f\u6267\u884c\uff0c\u5fc5\u987b\u5148\u6210\u529f\u6267\u884c\u4e00\u4e2a\u8bed\u53e5\u624d\u80fd\u6267\u884c\u4e0b\u4e00\u4e2a\u8bed\u53e5\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202407\/05\/2024070520425057611.jpg\" class=\"aligncenter\" title=\"\u8be6\u89e3MySQL\u8bed\u53e5\u4e2d\u7684DDL\u63d2\u56fe\" alt=\"\u8be6\u89e3MySQL\u8bed\u53e5\u4e2d\u7684DDL\u63d2\u56fe\" \/><\/p>\n<p><strong>\u4ec0\u4e48\u662f MySQL \u4e2d\u7684 DDL\uff1f<\/strong><\/p>\n<p>DDL\uff08Data Definition Language\uff09\u662f MySQL \u4e2d\u7528\u4e8e\u521b\u5efa\u3001\u4fee\u6539\u548c\u5220\u9664\u6570\u636e\u5e93\u5bf9\u8c61\uff08\u5982\u8868\u3001\u89c6\u56fe\u3001\u7d22\u5f15\u7b49\uff09\u7684\u4e00\u7cfb\u5217\u8bed\u53e5\u3002\u8fd9\u4e9b\u8bed\u53e5\u672c\u8d28\u4e0a\u662f\u7528\u6765\u5b9a\u4e49\u6570\u636e\u5e93\u7684\u7ed3\u6784\u548c\u5185\u5bb9\u7684\u3002<\/p>\n<p><strong>DDL \u8bed\u53e5\u7684\u7c7b\u578b<\/strong><\/p>\n<p>MySQL \u4e2d\u7684 DDL \u8bed\u53e5\u4e3b\u8981\u6709\u4ee5\u4e0b\u7c7b\u578b\uff1a<\/p>\n<ul>\n<li> <strong>CREATE\uff1a<\/strong> \u521b\u5efa\u65b0\u6570\u636e\u5e93\u5bf9\u8c61\u3002<\/li>\n<li> <strong>ALTER\uff1a<\/strong> \u4fee\u6539\u73b0\u6709\u6570\u636e\u5e93\u5bf9\u8c61\u3002<\/li>\n<li> <strong>DROP\uff1a<\/strong> \u5220\u9664\u6570\u636e\u5e93\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<p><strong>CREATE \u8bed\u53e5<\/strong><\/p>\n<p>CREATE \u8bed\u53e5\u7528\u4e8e\u521b\u5efa\u65b0\u7684\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u8868\u3001\u89c6\u56fe\u3001\u7d22\u5f15\u7b49\u3002\u5176\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre>CREATE [TYPE] [OBJECT NAME] (COLUMN DEFINITIONS) [CONSTRAINTS]<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u4f8b\u5982\uff0c\u8981\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a employees \u7684\u8868\uff0c\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u8bed\u53e5\uff1a<\/p>\n<pre>CREATE TABLE employees (\n    id INT NOT NULL AUTO_INCREMENT,\n    name VARCHAR(255) NOT NULL,\n    email VARCHAR(255) NOT NULL\n);<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>ALTER \u8bed\u53e5<\/strong><\/p>\n<p>ALTER \u8bed\u53e5\u7528\u4e8e\u4fee\u6539\u73b0\u6709\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u6dfb\u52a0\u6216\u5220\u9664\u5217\u3001\u66f4\u6539\u6570\u636e\u7c7b\u578b\u6216\u6dfb\u52a0\u7ea6\u675f\u3002\u5176\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre>ALTER [TYPE] [OBJECT NAME] [ALTERATION COMMAND]<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u4f8b\u5982\uff0c\u8981\u5411 employees \u8868\u4e2d\u6dfb\u52a0\u4e00\u4e2a phone_number \u5217\uff0c\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u8bed\u53e5\uff1a<\/p>\n<pre>ALTER TABLE employees ADD COLUMN phone_number VARCHAR(255);<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>DROP \u8bed\u53e5<\/strong><\/p>\n<p>DROP \u8bed\u53e5\u7528\u4e8e\u5220\u9664\u6570\u636e\u5e93\u5bf9\u8c61\u3002\u5176\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre>DROP [TYPE] [OBJECT NAME]<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u4f8b\u5982\uff0c\u8981\u5220\u9664 employees \u8868\uff0c\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u8bed\u53e5\uff1a<\/p>\n<pre>DROP TABLE employees;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>DDL \u8bed\u53e5\u7684\u6267\u884c\u987a\u5e8f<\/strong><\/p>\n<p>DDL \u8bed\u53e5\u6309\u987a\u5e8f\u6267\u884c\uff0c\u8fd9\u610f\u5473\u7740\u4e00\u4e2a DDL \u8bed\u53e5\u5fc5\u987b\u6210\u529f\u6267\u884c\u624d\u80fd\u6267\u884c\u4e0b\u4e00\u4e2a DDL \u8bed\u53e5\u3002\u4f8b\u5982\uff0c\u5fc5\u987b\u5148\u521b\u5efa\u8868\u624d\u80fd\u5728\u8868\u4e0a\u521b\u5efa\u7d22\u5f15\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u8be6\u89e3MySQL\u8bed\u53e5\u4e2d\u7684DDL\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>mysql \u4e2d\u7684 ddl\uff08\u6570\u636e\u5b9a\u4e49\u8bed\u8a00\uff09\u662f\u4e00\u7cfb\u5217\u7528\u4e8e\u521b\u5efa\u3001\u4fee\u6539\u548c\u5220\u9664\u6570\u636e\u5e93\u5bf9\u8c61\u7684\u8bed\u53e5\uff0c\u672c\u8d28\u4e0a\u5b9a\u4e49\u4e86\u6570\u636e\u5e93\u7684\u7ed3\u6784\u548c\u5185\u5bb9\u3002\u8fd9\u4e9b\u8bed\u53e5\u5305\u62ec\uff1acreate\uff1a\u521b\u5efa\u65b0\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u8868\u3001\u89c6\u56fe\u548c\u7d22\u5f15\u3002alter\uff1a\u4fee\u6539\u73b0\u6709\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u6dfb\u52a0\u6216\u5220\u9664\u5217\u3001\u66f4\u6539\u6570\u636e\u7c7b\u578b\u6216\u6dfb\u52a0\u7ea6\u675f\u3002drop\uff1a\u5220\u9664\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u8868\u548c\u89c6\u56fe\u3002ddl \u8bed\u53e5\u6309\u987a\u5e8f\u6267\u884c\uff0c\u5fc5\u987b\u5148\u6210\u529f\u6267\u884c\u4e00\u4e2a\u8bed\u53e5\u624d\u80fd\u6267\u884c\u4e0b\u4e00\u4e2a\u8bed\u53e5\u3002 \u4ec0\u4e48\u662f MySQL \u4e2d\u7684 DDL\uff1f DDL\uff08Data Definition Language\uff09\u662f MySQL \u4e2d\u7528\u4e8e\u521b\u5efa\u3001\u4fee\u6539\u548c\u5220\u9664\u6570\u636e\u5e93\u5bf9\u8c61\uff08\u5982\u8868\u3001\u89c6\u56fe\u3001\u7d22\u5f15\u7b49\uff09\u7684\u4e00\u7cfb\u5217\u8bed\u53e5\u3002\u8fd9\u4e9b\u8bed\u53e5\u672c\u8d28\u4e0a\u662f\u7528\u6765\u5b9a\u4e49\u6570\u636e\u5e93\u7684\u7ed3\u6784\u548c\u5185\u5bb9\u7684\u3002 DDL \u8bed\u53e5\u7684\u7c7b\u578b MySQL \u4e2d\u7684 DDL \u8bed\u53e5\u4e3b\u8981\u6709\u4ee5\u4e0b\u7c7b\u578b\uff1a CREATE\uff1a \u521b\u5efa\u65b0\u6570\u636e\u5e93\u5bf9\u8c61\u3002 ALTER\uff1a \u4fee\u6539\u73b0\u6709\u6570\u636e\u5e93\u5bf9\u8c61\u3002 DROP\uff1a \u5220\u9664\u6570\u636e\u5e93\u5bf9\u8c61\u3002 CREATE \u8bed\u53e5 CREATE \u8bed\u53e5\u7528\u4e8e\u521b\u5efa\u65b0\u7684\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u8868\u3001\u89c6\u56fe\u3001\u7d22\u5f15\u7b49\u3002\u5176\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a CREATE [TYPE] [OBJECT NAME] (COLUMN DEFINITIONS) [CONSTRAINTS] \u767b\u5f55\u540e\u590d\u5236 \u4f8b\u5982\uff0c\u8981\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a employees \u7684\u8868\uff0c\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u8bed\u53e5\uff1a CREATE TABLE employees ( id INT NOT NULL AUTO_INCREMENT, name VARCHAR(255) NOT NULL, email VARCHAR(255) [&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-6284","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6284","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=6284"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6284\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6284"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}