{"id":66855,"date":"2024-10-14T21:12:16","date_gmt":"2024-10-14T13:12:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/66855\/"},"modified":"2024-10-14T21:12:16","modified_gmt":"2024-10-14T13:12:16","slug":"mysql-error-number-3940-symbol-er_constraint_not_found-sqlstate-hy000-%e6%8a%a5%e9%8c%af-%e6%95%85%e9%9a%9c%e4%bf%ae%e5%be%a9-%e9%81%a0%e7%a8%8b%e8%99%95%e7%90%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/66855\/","title":{"rendered":"MySQL Error number: 3940; Symbol: ER_CONSTRAINT_NOT_FOUND; SQLSTATE: HY000 \u62a5\u932f \u6545\u969c\u4fee\u5fa9 \u9060\u7a0b\u8655\u7406"},"content":{"rendered":"<h1 id=\"mysql-%e9%8c%af%e8%aa%a4%e8%99%9f%e7%a2%bc%ef%bc%9a3940%ef%bc%9b%e7%ac%a6%e8%99%9f%ef%bc%9aer_constraint_not_found%ef%bc%9bsqlstate%ef%bc%9ahy000-%e6%95%85%e9%9a%9c%e4%bf%ae%e5%be%a9-%e9%81%a0-RaHEXkTleO\">MySQL \u932f\u8aa4\u865f\u78bc\uff1a3940\uff1b\u7b26\u865f\uff1aER_CONSTRAINT_NOT_FOUND\uff1bSQLSTATE\uff1aHY000 \u6545\u969c\u4fee\u5fa9 \u9060\u7a0b\u8655\u7406<\/h1>\n<p>\u5728\u4f7f\u7528 MySQL \u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u4fbf\u662f\u932f\u8aa4\u865f\u78bc 3940\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u8207\u7d04\u675f\u689d\u4ef6\u7684\u7f3a\u5931\u6709\u95dc\uff0c\u5177\u9ad4\u8868\u73fe\u70ba\u300cER_CONSTRAINT_NOT_FOUND\u300d\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u6210\u56e0\u3001\u5f71\u97ff\u4ee5\u53ca\u5982\u4f55\u9032\u884c\u6545\u969c\u4fee\u5fa9\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e6%a6%82%e8%bf%b0-RaHEXkTleO\">\u932f\u8aa4\u6982\u8ff0<\/h2>\n<p>MySQL \u932f\u8aa4\u865f\u78bc 3940 \u8868\u793a\u5728\u57f7\u884c\u67d0\u500b\u64cd\u4f5c\u6642\uff0c\u7cfb\u7d71\u7121\u6cd5\u627e\u5230\u6307\u5b9a\u7684\u7d04\u675f\u689d\u4ef6\u3002\u9019\u901a\u5e38\u767c\u751f\u5728\u4ee5\u4e0b\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u5617\u8a66\u522a\u9664\u6216\u4fee\u6539\u4e00\u500b\u4e0d\u5b58\u5728\u7684\u7d04\u675f\u3002<\/li>\n<li>\u5728\u57f7\u884c\u67e5\u8a62\u6642\uff0c\u5f15\u7528\u4e86\u932f\u8aa4\u7684\u7d04\u675f\u540d\u7a31\u3002<\/li>\n<li>\u6578\u64da\u5eab\u7d50\u69cb\u767c\u751f\u8b8a\u5316\uff0c\u4f46\u61c9\u7528\u7a0b\u5e8f\u672a\u80fd\u53ca\u6642\u66f4\u65b0\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e7%a4%ba%e4%be%8b-RaHEXkTleO\">\u932f\u8aa4\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba `users` \u7684\u8868\uff0c\u4e26\u4e14\u6211\u5011\u60f3\u8981\u522a\u9664\u4e00\u500b\u540d\u70ba `fk_user_role` \u7684\u5916\u9375\u7d04\u675f\u3002\u5982\u679c\u8a72\u7d04\u675f\u4e0d\u5b58\u5728\uff0c\u5247\u6703\u51fa\u73fe\u932f\u8aa4 3940\u3002\u4ee5\u4e0b\u662f\u53ef\u80fd\u5c0e\u81f4\u6b64\u932f\u8aa4\u7684 SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE users DROP FOREIGN KEY fk_user_role;<\/code><\/pre>\n<p>\u5982\u679c `fk_user_role` \u4e26\u4e0d\u5b58\u5728\u65bc `users` \u8868\u4e2d\uff0c\u5247\u6703\u8fd4\u56de\u932f\u8aa4 3940\u3002<\/p>\n<h2 id=\"%e6%95%85%e9%9a%9c%e6%8e%92%e9%99%a4%e6%ad%a5%e9%a9%9f-RaHEXkTleO\">\u6545\u969c\u6392\u9664\u6b65\u9a5f<\/h2>\n<p>\u7576\u9047\u5230 MySQL \u932f\u8aa4 3940 \u6642\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u6b65\u9a5f\u9032\u884c\u6545\u969c\u6392\u9664\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e7%b4%84%e6%9d%9f%e5%90%8d%e7%a8%b1-RaHEXkTleO\">1. \u6aa2\u67e5\u7d04\u675f\u540d\u7a31<\/h3>\n<p>\u9996\u5148\uff0c\u78ba\u8a8d\u60a8\u6240\u5f15\u7528\u7684\u7d04\u675f\u540d\u7a31\u662f\u5426\u6b63\u78ba\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u4f86\u67e5\u770b\u8868\u4e2d\u7684\u6240\u6709\u7d04\u675f\uff1a<\/p>\n<pre><code>SHOW CREATE TABLE users;<\/code><\/pre>\n<p>\u9019\u5c07\u986f\u793a `users` \u8868\u7684\u5275\u5efa\u8a9e\u53e5\uff0c\u5305\u62ec\u6240\u6709\u7d04\u675f\u7684\u8a73\u7d30\u4fe1\u606f\u3002<\/p>\n<h3 id=\"2-%e7%a2%ba%e8%aa%8d%e7%b4%84%e6%9d%9f%e6%98%af%e5%90%a6%e5%ad%98%e5%9c%a8-RaHEXkTleO\">2. \u78ba\u8a8d\u7d04\u675f\u662f\u5426\u5b58\u5728<\/h3>\n<p>\u5982\u679c\u60a8\u4e0d\u78ba\u5b9a\u7d04\u675f\u662f\u5426\u5b58\u5728\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u6aa2\u67e5\uff1a<\/p>\n<pre><code>SELECT CONSTRAINT_NAME \nFROM information_schema.TABLE_CONSTRAINTS \nWHERE TABLE_NAME = 'users';<\/code><\/pre>\n<p>\u9019\u5c07\u5217\u51fa\u6240\u6709\u8207 `users` \u8868\u76f8\u95dc\u7684\u7d04\u675f\u540d\u7a31\u3002<\/p>\n<h3 id=\"3-%e6%9b%b4%e6%96%b0%e6%87%89%e7%94%a8%e7%a8%8b%e5%ba%8f%e4%bb%a3%e7%a2%bc-RaHEXkTleO\">3. \u66f4\u65b0\u61c9\u7528\u7a0b\u5e8f\u4ee3\u78bc<\/h3>\n<p>\u5982\u679c\u6578\u64da\u5eab\u7d50\u69cb\u5df2\u7d93\u6539\u8b8a\uff0c\u8acb\u78ba\u4fdd\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u4ee3\u78bc\u4e5f\u96a8\u4e4b\u66f4\u65b0\u3002\u9019\u5305\u62ec\u6aa2\u67e5\u6240\u6709\u6d89\u53ca\u8a72\u7d04\u675f\u7684 SQL \u8a9e\u53e5\u3002<\/p>\n<h3 id=\"4-%e6%b8%ac%e8%a9%a6%e5%92%8c%e9%a9%97%e8%ad%89-RaHEXkTleO\">4. \u6e2c\u8a66\u548c\u9a57\u8b49<\/h3>\n<p>\u5728\u9032\u884c\u4efb\u4f55\u66f4\u6539\u5f8c\uff0c\u8acb\u52d9\u5fc5\u6e2c\u8a66\u60a8\u7684 SQL \u8a9e\u53e5\u4ee5\u78ba\u4fdd\u554f\u984c\u5df2\u89e3\u6c7a\u3002\u53ef\u4ee5\u4f7f\u7528\u7c21\u55ae\u7684\u67e5\u8a62\u4f86\u9a57\u8b49\u7d04\u675f\u7684\u5b58\u5728\u6027\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-RaHEXkTleO\">\u7d50\u8ad6<\/h2>\n<p>MySQL \u932f\u8aa4\u865f\u78bc 3940 \u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\uff0c\u901a\u5e38\u8207\u7d04\u675f\u689d\u4ef6\u7684\u7f3a\u5931\u6709\u95dc\u3002\u901a\u904e\u4ed4\u7d30\u6aa2\u67e5\u7d04\u675f\u540d\u7a31\u3001\u78ba\u8a8d\u7d04\u675f\u662f\u5426\u5b58\u5728\u4ee5\u53ca\u66f4\u65b0\u61c9\u7528\u7a0b\u5e8f\u4ee3\u78bc\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u6b64\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u5eab\u7ba1\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u53ef\u4ee5\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\uff0c\u78ba\u4fdd\u60a8\u7684\u6578\u64da\u5eab\u904b\u884c\u9806\u5229\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to troubleshoot MySQL Error 3940 (ER_CONSTRAINT_NOT_FOUND) with remote handling solutions for effective database management.<\/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-66855","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66855","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=66855"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66855\/revisions"}],"predecessor-version":[{"id":66856,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66855\/revisions\/66856"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=66855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=66855"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=66855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}