{"id":138,"date":"2018-08-20T02:05:49","date_gmt":"2018-08-19T18:05:49","guid":{"rendered":"https:\/\/wp.dj47.top\/?p=138"},"modified":"2021-10-20T16:19:03","modified_gmt":"2021-10-20T08:19:03","slug":"mysql%e6%b7%bb%e5%8a%a0%e5%a4%96%e9%94%ae","status":"publish","type":"post","link":"https:\/\/www.djlog.cn\/?p=138","title":{"rendered":"Mysql\u6dfb\u52a0\u5916\u952e"},"content":{"rendered":"
\u4e3a\u5df2\u7ecf\u6dfb\u52a0\u597d\u7684\u6570\u636e\u8868\u6dfb\u52a0\u5916\u952e:<\/code><\/span><\/div>\n
\u8bed\u6cd5:alter table \u8868\u540d add constraint FK_ID foreign key(\u4f60\u7684\u5916\u952e\u5b57\u6bb5\u540d) REFERENCES \u5916\u8868\u8868\u540d(\u5bf9\u5e94\u7684\u8868\u7684\u4e3b\u952e\u5b57\u6bb5\u540d);<\/code><\/span><\/div>\n
\u4f8b: alter table tb_active add constraint FK_ID foreign key(user_id) REFERENCES tb_user(id)<\/code><\/span><\/div>\n
<\/div>\n
<\/code><\/span><\/div>\n
\/\/FK_ID\u662f\u5916\u952e\u7684\u540d\u79f0<\/code><\/span><\/div>\n
\/*<\/code><\/span><\/div>\n
CREATE TABLE `tb_active` (<\/code><\/span><\/div>\n
\u00a0<\/code>`id` int(11) NOT NULL AUTO_INCREMENT,<\/code><\/span><\/div>\n
\u00a0<\/code>`title` varchar(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,<\/code><\/span><\/div>\n
\u00a0<\/code>`content` text CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,<\/code><\/span><\/div>\n
\u00a0<\/code>`user_id` int(11) NOT NULL,<\/code><\/span><\/div>\n
\u00a0<\/code>PRIMARY KEY (`id`),<\/code><\/span><\/div>\n
\u00a0<\/code>KEY `user_id` (`user_id`),<\/code><\/span><\/div>\n
\u00a0<\/code>KEY `user_id_2` (`user_id`),<\/code><\/span><\/div>\n
\u00a0<\/code>CONSTRAINT `FK_ID` FOREIGN KEY (`user_id`) REFERENCES `tb_user` (`id`)<\/code><\/span><\/div>\n
) ENGINE=InnoDB DEFAULT CHARSET=latin1<\/code><\/span><\/div>\n
*\/<\/code><\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u5220\u9664\u5916\u952e<\/code><\/span><\/div>\n
\u8bed\u6cd5\uff1a ALTER TABLE table-name DROP FOREIGN KEY key-id;<\/code><\/span><\/div>\n
\u4f8b\uff1a\u00a0\u00a0 ALTER TABLE `tb_active` DROP FOREIGN KEY `FK_ID`<\/code><\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u81ea\u52a8\u952e\u66f4\u65b0\u548c\u5220\u9664\uff1a<\/code><\/span><\/div>\n
\u5916\u952e\u53ef\u4ee5\u4fdd\u8bc1\u65b0\u63d2\u5165\u7684\u8bb0\u5f55\u7684\u5b8c\u6574\u6027\uff0c\u4f46\u662f\uff0c\u5982\u679c\u5728REFERENCES\u4ece\u53e5\u4e2d\u5df2\u547d\u540d\u7684\u8868\u5220\u9664\u8bb0\u5f55\u4f1a\u600e\u4e48\u6837\uff1f\u5728\u4f7f\u7528\u540c\u6837\u7684\u503c\u4f5c\u4e3a\u5916\u952e\u7684\u8f85\u52a9\u8868\u4e2d\u4f1a\u53d1\u751f\u4ec0\u4e48?<\/code><\/span><\/div>\n
\u00a0<\/code>\u00a0<\/span><\/div>\n
\u00a0<\/code>\u5f88\u660e\u663e\uff0c\u90a3\u4e9b\u8bb0\u5f55\u4e5f\u5e94\u8be5\u88ab\u5220\u9664\uff0c\u5426\u5219\u5728\u6570\u636e\u5e93\u4e2d\u5c31\u4f1a\u6709\u5f88\u591a\u65e0\u610f\u4e49\u7684\u5b64\u7acb\u8bb0\u5f55\uff0cMYSQL\u53ef\u4ee5\u901a\u8fc7\u5411FOREIGN KEY...REFERENCES\u4fee\u9970\u7b26\u6dfb\u52a0\u4e00\u4e2aON <\/code>DELETE<\/code>\u00a0\u6216ON UPDATE\u5b50\u53e5\u7b80\u5316\u4efb\u52a1\uff0c\u5b83\u544a\u8bc9\u4e86\u6570\u636e\u5e93\u5728\u8fd9\u79cd\u60c5\u51b5\u5982\u4f55\u5904\u7406\u5b64\u7acb\u4efb\u52a1<\/code><\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u00a0<\/code>\u5173\u952e\u5b57\u00a0\u00a0\u00a0\u00a0 \u542b\u4e49<\/code><\/span><\/div>\n
\u00a0<\/code>CASCADE\u00a0\u00a0\u00a0 \u5220\u9664\u5305\u542b\u4e0e\u5df2\u5220\u9664\u952e\u503c\u6709\u53c2\u7167\u5173\u7cfb\u7684\u6240\u6709\u8bb0\u5f55<\/code><\/span><\/div>\n
\u00a0<\/code>SET NULL\u00a0\u00a0 \u4fee\u6539\u5305\u542b\u4e0e\u5df2\u5220\u9664\u952e\u503c\u6709\u53c2\u7167\u5173\u7cfb\u7684\u6240\u6709\u8bb0\u5f55\uff0c\u4f7f\u7528NULL\u503c\u66ff\u6362\uff08\u53ea\u80fd\u7528\u4e8e\u5df2\u6807\u8bb0\u4e3aNOT NULL\u7684\u5b57\u6bb5\uff09<\/code><\/span><\/div>\n
\u00a0<\/code>RESTRICT\u00a0\u00a0 \u62d2\u7edd\u5220\u9664\u8981\u6c42\uff0c\u76f4\u5230\u4f7f\u7528\u5220\u9664\u952e\u503c\u7684\u8f85\u52a9\u8868\u88ab\u624b\u5de5\u5220\u9664\uff0c\u5e76\u4e14\u6ca1\u6709\u53c2\u7167\u65f6(\u8fd9\u662f\u9ed8\u8ba4\u8bbe\u7f6e\uff0c\u4e5f\u662f\u6700\u5b89\u5168\u7684\u8bbe\u7f6e)<\/code><\/span><\/div>\n
\u00a0<\/code>NO ACTION\u00a0 \u5565\u4e5f\u4e0d\u505a<\/code><\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u00a0<\/code>\u8bf7\u6ce8\u610f\uff0c\u901a\u8fc7ON UPDATE \u548c ON <\/code>DELETE<\/code>\u89c4\u5219\uff0c\u8bbe\u7f6eMYSQL\u80fd\u591f\u5b9e\u73b0\u81ea\u52a8\u64cd\u4f5c\u65f6\uff0c\u5982\u679c\u952e\u7684\u5173\u7cfb\u6ca1\u6709\u8bbe\u7f6e\u597d\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e25\u91cd\u7684\u6570\u636e\u7834\u574f\uff0c<\/code><\/span><\/div>\n
\u00a0<\/code>\u4f8b\u5982\uff1a\u5982\u679c\u4e00\u7cfb\u5217\u7684\u8868\u901a\u8fc7\u5916\u952e\u5173\u7cfb\u548cON <\/code>DELETE<\/code>\u00a0CASCADE \u89c4\u5219\u8fde\u63a5\u65f6\uff0c\u4efb\u610f\u4e00\u4e2a\u4e3b\u8868\u7684\u53d8\u5316\u90fd\u4f1a\u5bfc\u81f4\u751a\u81f3\u53ea\u548c\u539f\u59cb\u5220\u9664\u6709\u4e00\u4e9b\u5c06\u8981\u8054\u7cfb\u7684\u8bb0\u5f55\u5728\u6ca1\u6709\u8b66\u544a\u7684\u60c5\u51b5\u88ab\u5220\u9664\uff0c\u6240\u4ee5\uff0c\u6211\u4eec\u5728\u64cd\u4f5c\u4e4b\u524d\u8fd8\u8981\u68c0\u67e5\u8fd9\u4e9b\u89c4\u5219\u7684\uff0c\u64cd\u4f5c\u4e4b\u540e\u8fd8\u8981\u518d\u6b21\u68c0\u67e5.<\/code><\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u6dfb\u52a0\u5916\u952e<\/code><\/span><\/div>\n
alter table locstock add foreign key locstock_ibfk2(stockid) references product(stockid)<\/code><\/span><\/div>\n
locstock \u4e3a\u8868\u540d, locstock_ibfk2 \u4e3a\u5916\u952e\u540d \u7b2c\u4e00\u4e2a\u62ec\u53f7\u91cc\u586b\u5199\u5916\u952e\u5217\u540d, product\u4e3a\u8868\u540d,\u7b2c\u4e8c\u4e2a\u62ec\u53f7\u91cc\u662f\u5199\u5916\u952e\u5173\u8054\u7684\u5217\u540d<\/code><\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u5220\u9664\u5916\u952e <\/code><\/span><\/div>\n
alter table locstock drop foreign key locstock_ibfk2<\/code><\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u67e5\u770b\u8868\u6709\u54ea\u4e9b\u5916\u952e<\/code><\/span><\/div>\n
show create table locstock<\/code><\/span><\/div>\n
\u00a0<\/span><\/div>\n
[CONSTRAINT symbol] FOREIGN KEY [id] (index_col_name, ...)\u00a0 <\/code><\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>REFERENCES tbl_name (index_col_name, ...)\u00a0 <\/code><\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>[ON <\/code>DELETE<\/code>\u00a0{RESTRICT | CASCADE | SET NULL | NO ACTION}]\u00a0 <\/code><\/span><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>[ON UPDATE {RESTRICT | CASCADE | SET NULL | NO ACTION}]\u00a0 <\/code><\/span><\/div>\n
\u00a0<\/span><\/div>\n
\u00a0<\/span><\/div>\n
    \n
  • \n
    \u6240\u6709tables\u5fc5\u987b\u662fInnoDB\u578b \uff0c\u5b83\u4eec\u4e0d\u80fd\u662f\u4e34\u65f6\u8868\u3002<\/code><\/span><\/div>\n<\/li>\n
  • \n
    \u5728\u5f15\u7528\u8868\u4e2d\uff0c\u5fc5\u987b\u6709\u4e00\u4e2a\u7d22\u5f15\uff0c\u5916\u952e\u5217\u4ee5\u540c\u6837\u7684\u987a\u5e8f\u88ab\u5217\u5728\u5176\u4e2d\u4f5c\u4e3a\u7b2c\u4e00\u5217\u3002\u8fd9\u6837\u4e00\u4e2a\u7d22\u5f15\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5b83\u5fc5\u987b\u5728\u5f15\u7528\u8868\u91cc\u88ab\u81ea\u52a8\u521b\u5efa\u3002<\/code><\/span><\/div>\n<\/li>\n
  • \n
    \u5728\u5f15\u7528\u8868\u4e2d\uff0c\u5fc5\u987b\u6709\u4e00\u4e2a\u7d22\u5f15\uff0c\u88ab\u5f15\u7528\u7684\u5217\u4ee5\u540c\u6837\u7684\u987a\u5e8f\u88ab\u5217\u5728\u5176\u4e2d\u4f5c\u4e3a\u7b2c\u4e00\u5217\u3002<\/code><\/span><\/div>\n<\/li>\n
  • \n
    \u4e0d\u652f\u6301\u5bf9\u5916\u952e\u5217\u7684\u7d22\u5f15\u524d\u7f00\u3002\u8fd9\u6837\u7684\u540e\u679c\u4e4b\u4e00\u662fBLOB\u548cTEXT\u5217\u4e0d\u88ab\u5305\u62ec\u5728\u4e00\u4e2a\u5916\u952e\u4e2d\uff0c \u8fd9\u662f\u56e0\u4e3a\u5bf9\u8fd9\u4e9b\u5217\u7684\u7d22\u5f15\u5fc5\u987b\u603b\u662f\u5305\u542b\u4e00\u4e2a\u524d\u7f00\u957f\u5ea6\u3002<\/code><\/span><\/div>\n<\/li>\n
  • \n
    \u5982\u679cCONSTRAINTsymbol \u88ab\u7ed9\u51fa\uff0c\u5b83\u5728\u6570\u636e\u5e93\u91cc\u5fc5\u987b\u662f\u552f\u4e00\u7684\u3002\u5982\u679c\u5b83\u6ca1\u6709\u88ab\u7ed9\u51fa\uff0cInnoDB\u81ea\u52a8\u521b\u5efa\u8fd9\u4e2a\u540d\u5b57\u3002<\/code><\/span><\/div>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

    \u4e3a\u5df2\u7ecf\u6dfb\u52a0\u597d\u7684\u6570\u636e\u8868\u6dfb\u52a0\u5916\u952e: \u8bed\u6cd5:alter table \u8868\u540d add constraint FK_ID […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[28],"class_list":["post-138","post","type-post","status-publish","format-standard","hentry","category-mysql","tag-mysql"],"_links":{"self":[{"href":"https:\/\/www.djlog.cn\/index.php?rest_route=\/wp\/v2\/posts\/138","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.djlog.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.djlog.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.djlog.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.djlog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=138"}],"version-history":[{"count":0,"href":"https:\/\/www.djlog.cn\/index.php?rest_route=\/wp\/v2\/posts\/138\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.djlog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=138"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.djlog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=138"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.djlog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=138"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}