{"id":177915,"date":"2024-11-08T16:37:26","date_gmt":"2024-11-08T08:37:26","guid":{"rendered":"https:\/\/server.hk\/cnblog\/177915\/"},"modified":"2024-11-08T16:37:27","modified_gmt":"2024-11-08T08:37:27","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41239-sqlstate-42000-er_wrong_fk_def-s%e7%9a%84%e5%a4%96%e9%8d%b5%e5%ae%9a%e7%be%a9%e4%b8%8d%e6%ad%a3%e7%a2%ba%ef%bc%9as","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/177915\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41239 &#8211; SQLSTATE: 42000 (ER_WRONG_FK_DEF) &#8216;%s&#8217;\u7684\u5916\u9375\u5b9a\u7fa9\u4e0d\u6b63\u78ba\uff1a%s"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41239-sqlstate-42000-er_wrong_fk_def-EWkBvtrTZG\">\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41239 &#8211; SQLSTATE: 42000 (ER_WRONG_FK_DEF)<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa4\u4ee3\u78bc1239\uff0c\u8a72\u932f\u8aa4\u7684\u63cf\u8ff0\u70ba\u201c\u5916\u9375\u5b9a\u7fa9\u4e0d\u6b63\u78ba\u201d\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u5275\u5efa\u6216\u4fee\u6539\u8868\u6642\uff0c\u7576\u5916\u9375\u7d04\u675f\u7684\u5b9a\u7fa9\u4e0d\u7b26\u5408\u8981\u6c42\u6642\uff0c\u5c31\u6703\u51fa\u73fe\u6b64\u932f\u8aa4\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u8a72\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e5%8e%9f%e5%9b%a0%e5%88%86%e6%9e%90-EWkBvtrTZG\">\u932f\u8aa4\u539f\u56e0\u5206\u6790<\/h2>\n<p>MySQL\u932f\u8aa41239\u7684\u4e3b\u8981\u539f\u56e0\u901a\u5e38\u5305\u62ec\u4ee5\u4e0b\u5e7e\u500b\u65b9\u9762\uff1a<\/p>\n<ul>\n<li><strong>\u5916\u9375\u53c3\u8003\u7684\u8868\u4e0d\u5b58\u5728\uff1a<\/strong>\u7576\u4f60\u8a66\u5716\u5728\u4e00\u500b\u8868\u4e2d\u5275\u5efa\u5916\u9375\u6642\uff0c\u6240\u53c3\u8003\u7684\u8868\u5fc5\u9808\u5b58\u5728\u3002\u5982\u679c\u8a72\u8868\u4e0d\u5b58\u5728\uff0c\u5247\u6703\u5c0e\u81f4\u6b64\u932f\u8aa4\u3002<\/li>\n<li><strong>\u5916\u9375\u548c\u4e3b\u9375\u7684\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\uff1a<\/strong>\u5916\u9375\u6240\u53c3\u8003\u7684\u5217\u5fc5\u9808\u8207\u4e3b\u9375\u7684\u6578\u64da\u985e\u578b\u5b8c\u5168\u4e00\u81f4\u3002\u5982\u679c\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\uff0c\u5247\u6703\u51fa\u73fe\u932f\u8aa4\u3002<\/li>\n<li><strong>\u5916\u9375\u7d04\u675f\u7684\u5217\u672a\u88ab\u7d22\u5f15\uff1a<\/strong>\u5728MySQL\u4e2d\uff0c\u5916\u9375\u7d04\u675f\u7684\u5217\u5fc5\u9808\u662f\u7d22\u5f15\u5217\u3002\u5982\u679c\u5916\u9375\u5217\u6c92\u6709\u7d22\u5f15\uff0c\u5247\u6703\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<li><strong>\u5916\u9375\u7d04\u675f\u7684\u5217\u70baNULL\uff1a<\/strong>\u5982\u679c\u5916\u9375\u5217\u7684\u503c\u70baNULL\uff0c\u4e14\u8a72\u5217\u4e0d\u5141\u8a31NULL\uff0c\u5247\u6703\u51fa\u73fe\u6b64\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bf%ae%e5%be%a9%e6%ad%a5%e9%a9%9f-EWkBvtrTZG\">\u4fee\u5fa9\u6b65\u9a5f<\/h2>\n<p>\u8981\u4fee\u5fa9MySQL\u932f\u8aa41239\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u6b65\u9a5f\u9032\u884c\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e5%8f%83%e8%80%83%e7%9a%84%e8%a1%a8%e6%98%af%e5%90%a6%e5%ad%98%e5%9c%a8-EWkBvtrTZG\">1. \u6aa2\u67e5\u53c3\u8003\u7684\u8868\u662f\u5426\u5b58\u5728<\/h3>\n<p>\u9996\u5148\uff0c\u78ba\u4fdd\u4f60\u6240\u53c3\u8003\u7684\u8868\u5df2\u7d93\u5b58\u5728\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u6aa2\u67e5\u8868\u7684\u5b58\u5728\u6027\uff1a<\/p>\n<pre><code>SHOW TABLES LIKE 'your_table_name';<\/code><\/pre>\n<h3 id=\"2-%e7%a2%ba%e8%aa%8d%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e5%8c%b9%e9%85%8d-EWkBvtrTZG\">2. \u78ba\u8a8d\u6578\u64da\u985e\u578b\u5339\u914d<\/h3>\n<p>\u6aa2\u67e5\u5916\u9375\u5217\u548c\u4e3b\u9375\u5217\u7684\u6578\u64da\u985e\u578b\u662f\u5426\u4e00\u81f4\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u67e5\u770b\u8868\u7d50\u69cb\uff1a<\/p>\n<pre><code>DESCRIBE your_table_name;<\/code><\/pre>\n<p>\u78ba\u4fdd\u5916\u9375\u5217\u7684\u6578\u64da\u985e\u578b\u8207\u4e3b\u9375\u5217\u5b8c\u5168\u76f8\u540c\uff0c\u5305\u62ec\u9577\u5ea6\u548c\u5c6c\u6027\u3002<\/p>\n<h3 id=\"3-%e7%a2%ba%e4%bf%9d%e5%a4%96%e9%8d%b5%e5%88%97%e6%9c%89%e7%b4%a2%e5%bc%95-EWkBvtrTZG\">3. \u78ba\u4fdd\u5916\u9375\u5217\u6709\u7d22\u5f15<\/h3>\n<p>\u5982\u679c\u5916\u9375\u5217\u6c92\u6709\u7d22\u5f15\uff0c\u5247\u9700\u8981\u70ba\u5176\u5275\u5efa\u7d22\u5f15\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>ALTER TABLE your_table_name ADD INDEX (foreign_key_column);<\/code><\/pre>\n<h3 id=\"4-%e6%aa%a2%e6%9f%a5null%e5%80%bc-EWkBvtrTZG\">4. \u6aa2\u67e5NULL\u503c<\/h3>\n<p>\u78ba\u4fdd\u5916\u9375\u5217\u4e0d\u5305\u542bNULL\u503c\u3002\u5982\u679c\u8a72\u5217\u4e0d\u5141\u8a31NULL\uff0c\u5247\u9700\u8981\u66f4\u65b0\u6216\u522a\u9664\u9019\u4e9b\u8a18\u9304\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u67e5\u627eNULL\u503c\uff1a<\/p>\n<pre><code>SELECT * FROM your_table_name WHERE foreign_key_column IS NULL;<\/code><\/pre>\n<h2 id=\"%e7%a4%ba%e4%be%8b-EWkBvtrTZG\">\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1a<code>orders<\/code>\u548c<code>customers<\/code>\uff0c\u6211\u5011\u5e0c\u671b\u5728<code>orders<\/code>\u8868\u4e2d\u5275\u5efa\u4e00\u500b\u5916\u9375\uff0c\u53c3\u8003<code>customers<\/code>\u8868\u7684\u4e3b\u9375\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u5916\u9375\u7684SQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE orders\nADD CONSTRAINT fk_customer\nFOREIGN KEY (customer_id) REFERENCES customers(id);<\/code><\/pre>\n<p>\u5982\u679c\u5728\u57f7\u884c\u6b64\u8a9e\u53e5\u6642\u51fa\u73fe\u932f\u8aa41239\uff0c\u5247\u9700\u8981\u6aa2\u67e5\u4e0a\u8ff0\u63d0\u5230\u7684\u5e7e\u500b\u65b9\u9762\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-EWkBvtrTZG\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u932f\u8aa41239\u901a\u5e38\u662f\u7531\u65bc\u5916\u9375\u5b9a\u7fa9\u4e0d\u6b63\u78ba\u5f15\u8d77\u7684\u3002\u901a\u904e\u6aa2\u67e5\u53c3\u8003\u7684\u8868\u662f\u5426\u5b58\u5728\u3001\u78ba\u4fdd\u6578\u64da\u985e\u578b\u5339\u914d\u3001\u70ba\u5916\u9375\u5217\u5275\u5efa\u7d22\u5f15\u4ee5\u53ca\u6aa2\u67e5NULL\u503c\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u6b64\u932f\u8aa4\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u548c\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\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u90fd\u80fd\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u5f37\u5927\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4fee\u5fa9MySQL\u932f\u8aa41239 (ER_WRONG_FK_DEF) \u7684\u5916\u9375\u5b9a\u7fa9\u4e0d\u6b63\u78ba\u554f\u984c\uff0c\u63d0\u4f9b\u89e3\u6c7a\u65b9\u6848\u548c\u6b65\u9a5f\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u5b8c\u6574\u6027\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-177915","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177915","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=177915"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177915\/revisions"}],"predecessor-version":[{"id":177916,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177915\/revisions\/177916"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=177915"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=177915"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=177915"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}