{"id":177809,"date":"2024-11-08T16:14:04","date_gmt":"2024-11-08T08:14:04","guid":{"rendered":"https:\/\/server.hk\/cnblog\/177809\/"},"modified":"2024-11-08T16:14:05","modified_gmt":"2024-11-08T08:14:05","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41215-sqlstate-hy000%ef%bc%88er_cannot_add_foreign%ef%bc%89%e7%84%a1%e6%b3%95%e6%b7%bb%e5%8a%a0%e5%a4%96%e9%8d%b5%e7%b4%84%e6%9d%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/177809\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41215 &#8211; SQLSTATE: HY000\uff08ER_CANNOT_ADD_FOREIGN\uff09\u7121\u6cd5\u6dfb\u52a0\u5916\u9375\u7d04\u675f"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41215-sqlstate-hy000%ef%bc%88er_cannot_add_foreign%ef%bc%89%e7%84%a1%e6%b3%95%e6%b7%bb%e5%8a%a0%e5%a4%96%e9%8d%b5%e7%b4%84%e6%9d%9f-jkONLeBhci\">\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41215 &#8211; SQLSTATE: HY000\uff08ER_CANNOT_ADD_FOREIGN\uff09\u7121\u6cd5\u6dfb\u52a0\u5916\u9375\u7d04\u675f<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u7d93\u5e38\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa41215\uff0c\u8a72\u932f\u8aa4\u7684\u63d0\u793a\u4fe1\u606f\u70ba\u201cSQLSTATE: HY000\uff08ER_CANNOT_ADD_FOREIGN\uff09\u7121\u6cd5\u6dfb\u52a0\u5916\u9375\u7d04\u675f\u201d\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u5617\u8a66\u6dfb\u52a0\u5916\u9375\u7d04\u675f\u6642\uff0c\u4e26\u4e14\u53ef\u80fd\u7531\u591a\u7a2e\u539f\u56e0\u5f15\u8d77\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a41215%e7%9a%84%e5%b8%b8%e8%a6%8b%e5%8e%9f%e5%9b%a0-jkONLeBhci\">\u932f\u8aa41215\u7684\u5e38\u898b\u539f\u56e0<\/h2>\n<p>\u5728\u5617\u8a66\u6dfb\u52a0\u5916\u9375\u7d04\u675f\u6642\uff0c\u932f\u8aa41215\u53ef\u80fd\u7531\u4ee5\u4e0b\u5e7e\u500b\u539f\u56e0\u5f15\u8d77\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\uff1a<\/strong>\u5916\u9375\u548c\u4e3b\u9375\u7684\u6578\u64da\u985e\u578b\u5fc5\u9808\u5b8c\u5168\u76f8\u540c\u3002\u5982\u679c\u4e3b\u9375\u662f\u6574\u6578\u985e\u578b\uff0c\u5916\u9375\u4e5f\u5fc5\u9808\u662f\u6574\u6578\u985e\u578b\uff0c\u4e26\u4e14\u5169\u8005\u7684\u9577\u5ea6\u548c\u7b26\u865f\u5fc5\u9808\u4e00\u81f4\u3002<\/li>\n<li><strong>\u7d22\u5f15\u554f\u984c\uff1a<\/strong>\u5916\u9375\u6240\u53c3\u8003\u7684\u5217\u5fc5\u9808\u662f\u4e3b\u9375\u6216\u5177\u6709\u552f\u4e00\u7d22\u5f15\u3002\u5982\u679c\u8a72\u5217\u6c92\u6709\u7d22\u5f15\uff0c\u5247\u7121\u6cd5\u6dfb\u52a0\u5916\u9375\u7d04\u675f\u3002<\/li>\n<li><strong>\u8868\u7684\u5b58\u5132\u5f15\u64ce\u4e0d\u652f\u6301\u5916\u9375\uff1a<\/strong>MySQL\u7684\u67d0\u4e9b\u5b58\u5132\u5f15\u64ce\uff08\u5982MyISAM\uff09\u4e0d\u652f\u6301\u5916\u9375\u7d04\u675f\u3002\u78ba\u4fdd\u4f7f\u7528\u7684\u5b58\u5132\u5f15\u64ce\u662fInnoDB\u3002<\/li>\n<li><strong>\u8868\u7684\u5b57\u7b26\u96c6\u4e0d\u4e00\u81f4\uff1a<\/strong>\u5982\u679c\u5169\u500b\u8868\u7684\u5b57\u7b26\u96c6\u6216\u6392\u5e8f\u898f\u5247\u4e0d\u4e00\u81f4\uff0c\u5247\u53ef\u80fd\u5c0e\u81f4\u7121\u6cd5\u6dfb\u52a0\u5916\u9375\u7d04\u675f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9%e9%8c%af%e8%aa%a41215-jkONLeBhci\">\u5982\u4f55\u4fee\u5fa9\u932f\u8aa41215<\/h2>\n<p>\u91dd\u5c0d\u4e0a\u8ff0\u539f\u56e0\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4fee\u5fa9\u932f\u8aa41215\u7684\u5177\u9ad4\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-jkONLeBhci\">1. \u6aa2\u67e5\u6578\u64da\u985e\u578b<\/h3>\n<pre><code>-- \u6aa2\u67e5\u4e3b\u9375\u548c\u5916\u9375\u7684\u6578\u64da\u985e\u578b\nSHOW CREATE TABLE parent_table;\nSHOW CREATE TABLE child_table;<\/code><\/pre>\n<p>\u78ba\u4fdd\u4e3b\u9375\u548c\u5916\u9375\u7684\u6578\u64da\u985e\u578b\u5b8c\u5168\u4e00\u81f4\u3002\u5982\u679c\u4e0d\u4e00\u81f4\uff0c\u8acb\u4fee\u6539\u76f8\u61c9\u7684\u5217\u3002<\/p>\n<h3 id=\"2-%e6%b7%bb%e5%8a%a0%e7%b4%a2%e5%bc%95-jkONLeBhci\">2. \u6dfb\u52a0\u7d22\u5f15<\/h3>\n<pre><code>-- \u70ba\u5916\u9375\u5217\u6dfb\u52a0\u7d22\u5f15\nALTER TABLE child_table ADD INDEX (foreign_key_column);<\/code><\/pre>\n<p>\u78ba\u4fdd\u5916\u9375\u6240\u53c3\u8003\u7684\u5217\u5728\u7236\u8868\u4e2d\u662f\u4e3b\u9375\u6216\u5177\u6709\u552f\u4e00\u7d22\u5f15\u3002<\/p>\n<h3 id=\"3-%e6%aa%a2%e6%9f%a5%e5%ad%98%e5%84%b2%e5%bc%95%e6%93%8e-jkONLeBhci\">3. \u6aa2\u67e5\u5b58\u5132\u5f15\u64ce<\/h3>\n<pre><code>-- \u6aa2\u67e5\u8868\u7684\u5b58\u5132\u5f15\u64ce\nSHOW TABLE STATUS WHERE Name='parent_table';\nSHOW TABLE STATUS WHERE Name='child_table';<\/code><\/pre>\n<p>\u5982\u679c\u8868\u7684\u5b58\u5132\u5f15\u64ce\u4e0d\u662fInnoDB\uff0c\u8acb\u5c07\u5176\u66f4\u6539\u70baInnoDB\uff1a<\/p>\n<pre><code>ALTER TABLE table_name ENGINE=InnoDB;<\/code><\/pre>\n<h3 id=\"4-%e7%a2%ba%e4%bf%9d%e5%ad%97%e7%ac%a6%e9%9b%86%e4%b8%80%e8%87%b4-jkONLeBhci\">4. \u78ba\u4fdd\u5b57\u7b26\u96c6\u4e00\u81f4<\/h3>\n<pre><code>-- \u6aa2\u67e5\u5b57\u7b26\u96c6\nSHOW TABLE STATUS WHERE Name='parent_table';\nSHOW TABLE STATUS WHERE Name='child_table';<\/code><\/pre>\n<p>\u5982\u679c\u5b57\u7b26\u96c6\u4e0d\u4e00\u81f4\uff0c\u8acb\u5c07\u5176\u66f4\u6539\u70ba\u76f8\u540c\u7684\u5b57\u7b26\u96c6\uff1a<\/p>\n<pre><code>ALTER TABLE table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;<\/code><\/pre>\n<h2 id=\"%e7%a4%ba%e4%be%8b-jkONLeBhci\">\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1a<code>users<\/code>\u548c<code>orders<\/code>\uff0c\u6211\u5011\u5e0c\u671b\u5728<code>orders<\/code>\u8868\u4e2d\u6dfb\u52a0\u4e00\u500b\u5916\u9375\uff0c\u53c3\u8003<code>users<\/code>\u8868\u7684\u4e3b\u9375\u3002\u4ee5\u4e0b\u662f\u53ef\u80fd\u5c0e\u81f4\u932f\u8aa41215\u7684\u60c5\u6cc1\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id INT NOT NULL,\n    name VARCHAR(100),\n    PRIMARY KEY (id)\n) ENGINE=InnoDB;\n\nCREATE TABLE orders (\n    order_id INT NOT NULL,\n    user_id BIGINT, -- \u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\n    PRIMARY KEY (order_id)\n) ENGINE=InnoDB;\n\nALTER TABLE orders ADD CONSTRAINT fk_user FOREIGN KEY (user_id) REFERENCES users(id); -- \u9019\u88e1\u6703\u5831\u932f1215<\/code><\/pre>\n<p>\u70ba\u4e86\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u6211\u5011\u9700\u8981\u5c07<code>user_id<\/code>\u7684\u6578\u64da\u985e\u578b\u66f4\u6539\u70ba<code>INT<\/code>\uff1a<\/p>\n<pre><code>ALTER TABLE orders MODIFY user_id INT;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-jkONLeBhci\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u932f\u8aa41215\u901a\u5e38\u662f\u7531\u65bc\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\u3001\u7d22\u5f15\u554f\u984c\u3001\u5b58\u5132\u5f15\u64ce\u4e0d\u652f\u6301\u6216\u5b57\u7b26\u96c6\u4e0d\u4e00\u81f4\u7b49\u539f\u56e0\u5f15\u8d77\u7684\u3002\u901a\u904e\u6aa2\u67e5\u548c\u4fee\u6b63\u9019\u4e9b\u554f\u984c\uff0c\u60a8\u53ef\u4ee5\u6210\u529f\u6dfb\u52a0\u5916\u9375\u7d04\u675f\uff0c\u5f9e\u800c\u4fdd\u6301\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\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\u66f4\u597d\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\uff0c\u7279\u5225\u662f\u5728\u9999\u6e2f\u5730\u5340\u7684\u6578\u64da\u4e2d\u5fc3\u4e2d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41215\uff08SQLSTATE: HY000\uff09\uff0c\u89e3\u6c7a\u7121\u6cd5\u6dfb\u52a0\u5916\u9375\u7d04\u675f\u7684\u554f\u984c\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-177809","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177809","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=177809"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177809\/revisions"}],"predecessor-version":[{"id":177810,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177809\/revisions\/177810"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=177809"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=177809"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=177809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}