{"id":80413,"date":"2024-10-16T14:17:16","date_gmt":"2024-10-16T06:17:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/80413\/"},"modified":"2024-10-16T14:17:16","modified_gmt":"2024-10-16T06:17:16","slug":"mysql%e4%b8%ad%e5%a4%9a%e8%a1%a8%e5%88%aa%e9%99%a4%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/80413\/","title":{"rendered":"MySQL\u4e2d\u591a\u8868\u522a\u9664\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"mysql%e4%b8%ad%e5%a4%9a%e8%a1%a8%e5%88%aa%e9%99%a4%e6%96%b9%e6%b3%95-QjQBsNDkGm\">MySQL\u4e2d\u591a\u8868\u522a\u9664\u65b9\u6cd5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u522a\u9664\u64cd\u4f5c\u662f\u5e38\u898b\u7684\u9700\u6c42\u4e4b\u4e00\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u522a\u9664\u6578\u64da\u3002\u7576\u6d89\u53ca\u5230\u591a\u8868\u522a\u9664\u6642\uff0c\u7406\u89e3\u5982\u4f55\u6b63\u78ba\u5730\u57f7\u884c\u9019\u4e9b\u64cd\u4f5c\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0eMySQL\u4e2d\u591a\u8868\u522a\u9664\u7684\u5e7e\u7a2e\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"1-%e4%bd%bf%e7%94%a8join%e8%aa%9e%e5%8f%a5%e5%88%aa%e9%99%a4%e5%a4%9a%e8%a1%a8%e6%95%b8%e6%93%9a-QjQBsNDkGm\">1. \u4f7f\u7528JOIN\u8a9e\u53e5\u522a\u9664\u591a\u8868\u6578\u64da<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528JOIN\u8a9e\u53e5\u4f86\u522a\u9664\u591a\u500b\u8868\u4e2d\u7684\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u901a\u5e38\u7528\u65bc\u9700\u8981\u6839\u64da\u67d0\u4e9b\u689d\u4ef6\u5f9e\u591a\u500b\u8868\u4e2d\u522a\u9664\u76f8\u95dc\u6578\u64da\u7684\u60c5\u6cc1\u3002<\/p>\n<pre><code>DELETE t1, t2\nFROM table1 t1\nJOIN table2 t2 ON t1.id = t2.foreign_id\nWHERE t1.condition = 'value';<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u7576table1\u4e2d\u7684\u67d0\u500b\u689d\u4ef6\u6eff\u8db3\u6642\uff0c\u5c07\u540c\u6642\u522a\u9664table1\u548ctable2\u4e2d\u7684\u76f8\u95dc\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u52e2\u5728\u65bc\u53ef\u4ee5\u4e00\u6b21\u6027\u522a\u9664\u591a\u500b\u8868\u4e2d\u7684\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n<h2 id=\"2-%e4%bd%bf%e7%94%a8%e5%ad%90%e6%9f%a5%e8%a9%a2%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a-QjQBsNDkGm\">2. \u4f7f\u7528\u5b50\u67e5\u8a62\u522a\u9664\u6578\u64da<\/h2>\n<p>\u53e6\u4e00\u7a2e\u522a\u9664\u591a\u8868\u6578\u64da\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u5b50\u67e5\u8a62\u3002\u9019\u7a2e\u65b9\u6cd5\u9069\u5408\u65bc\u9700\u8981\u6839\u64da\u4e00\u500b\u8868\u4e2d\u7684\u6578\u64da\u4f86\u522a\u9664\u53e6\u4e00\u500b\u8868\u4e2d\u7684\u6578\u64da\u7684\u60c5\u6cc1\u3002<\/p>\n<pre><code>DELETE FROM table1\nWHERE id IN (SELECT foreign_id FROM table2 WHERE condition = 'value');<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u9996\u5148\u5f9etable2\u4e2d\u9078\u64c7\u7b26\u5408\u689d\u4ef6\u7684foreign_id\uff0c\u7136\u5f8c\u4f7f\u7528\u9019\u4e9bID\u4f86\u522a\u9664table1\u4e2d\u7684\u76f8\u61c9\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u9748\u6d3b\u6027\u4f7f\u5f97\u5b83\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h2 id=\"3-%e4%bd%bf%e7%94%a8cascade%e5%88%aa%e9%99%a4-QjQBsNDkGm\">3. \u4f7f\u7528CASCADE\u522a\u9664<\/h2>\n<p>\u5982\u679c\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\u4f7f\u7528\u4e86\u5916\u9375\u7d04\u675f\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528CASCADE\u522a\u9664\u3002\u9019\u610f\u5473\u8457\u7576\u4e3b\u8868\u4e2d\u7684\u67d0\u689d\u8a18\u9304\u88ab\u522a\u9664\u6642\uff0c\u6240\u6709\u5f15\u7528\u8a72\u8a18\u9304\u7684\u5b50\u8868\u4e2d\u7684\u8a18\u9304\u4e5f\u6703\u81ea\u52d5\u88ab\u522a\u9664\u3002<\/p>\n<pre><code>ALTER TABLE table2\nADD CONSTRAINT fk_foreign_id\nFOREIGN KEY (foreign_id) REFERENCES table1(id)\nON DELETE CASCADE;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u7576table1\u4e2d\u7684\u67d0\u689d\u8a18\u9304\u88ab\u522a\u9664\u6642\uff0c\u6240\u6709\u5728table2\u4e2d\u5f15\u7528\u8a72\u8a18\u9304\u7684foreign_id\u4e5f\u6703\u81ea\u52d5\u88ab\u522a\u9664\u3002\u9019\u7a2e\u65b9\u6cd5\u7c21\u5316\u4e86\u6578\u64da\u7ba1\u7406\uff0c\u6e1b\u5c11\u4e86\u624b\u52d5\u522a\u9664\u7684\u9700\u8981\u3002<\/p>\n<h2 id=\"4-%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-QjQBsNDkGm\">4. \u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u5728\u57f7\u884c\u522a\u9664\u64cd\u4f5c\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u9032\u884c\u6578\u64da\u5099\u4efd\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u522a\u9664\u91cd\u8981\u6578\u64da\u3002<\/li>\n<li>\u5728\u4f7f\u7528JOIN\u6216\u5b50\u67e5\u8a62\u522a\u9664\u6642\uff0c\u52d9\u5fc5\u78ba\u8a8d\u689d\u4ef6\u7684\u6b63\u78ba\u6027\uff0c\u4ee5\u907f\u514d\u522a\u9664\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u3002<\/li>\n<li>\u4f7f\u7528CASCADE\u522a\u9664\u6642\uff0c\u9700\u8b39\u614e\u8a2d\u8a08\u5916\u9375\u7d04\u675f\uff0c\u4ee5\u514d\u9020\u6210\u610f\u5916\u7684\u6578\u64da\u4e1f\u5931\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-QjQBsNDkGm\">\u7e3d\u7d50<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u591a\u8868\u522a\u9664\u64cd\u4f5c\u53ef\u4ee5\u901a\u904eJOIN\u8a9e\u53e5\u3001\u5b50\u67e5\u8a62\u6216CASCADE\u522a\u9664\u7b49\u65b9\u6cd5\u4f86\u5be6\u73fe\u3002\u6bcf\u7a2e\u65b9\u6cd5\u90fd\u6709\u5176\u7279\u5b9a\u7684\u61c9\u7528\u5834\u666f\u548c\u512a\u7f3a\u9ede\uff0c\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u7ba1\u7406\u7684\u6548\u7387\u548c\u5b89\u5168\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a>\u89e3\u6c7a\u65b9\u6848\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u6574\u9ad4\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u591a\u8868\u522a\u9664\u7684\u65b9\u6cd5\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u5730\u522a\u9664\u591a\u500b\u8868\u4e2d\u7684\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-80413","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=80413"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80413\/revisions"}],"predecessor-version":[{"id":80414,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80413\/revisions\/80414"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=80413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=80413"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=80413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}