{"id":179056,"date":"2024-11-08T22:38:24","date_gmt":"2024-11-08T14:38:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179056\/"},"modified":"2024-11-08T22:38:25","modified_gmt":"2024-11-08T14:38:25","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-postgresql-%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a42p19-invalid_recursion%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179056\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42P19 &#8211; invalid_recursion\uff1f"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-postgresql-%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a42p19-invalid_recursion-wQDtaQflUz\">\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42P19 &#8211; invalid_recursion<\/h1>\n<p>\u5728\u4f7f\u7528 PostgreSQL \u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u4ee3\u78bc\uff0c\u5176\u4e2d\u4e4b\u4e00\u662f\u932f\u8aa4\u4ee3\u78bc 42P19\uff0c\u8a72\u932f\u8aa4\u901a\u5e38\u8868\u793a\u300cinvalid_recursion\u300d\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u51fa\u73fe\u5728\u4f7f\u7528\u905e\u6b78\u67e5\u8a62\u6642\uff0c\u7279\u5225\u662f\u5728\u4f7f\u7528\u516c\u7528\u8868\u8868\u9054\u5f0f\uff08CTE\uff09\u6642\u3002\u672c\u6587\u5c07\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%a4%e4%bb%a3%e7%a2%bc-42p19-%e7%9a%84%e5%8e%9f%e5%9b%a0-wQDtaQflUz\">\u932f\u8aa4\u4ee3\u78bc 42P19 \u7684\u539f\u56e0<\/h2>\n<p>\u932f\u8aa4\u4ee3\u78bc 42P19 \u901a\u5e38\u767c\u751f\u5728\u4ee5\u4e0b\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528\u905e\u6b78 CTE \u6642\uff0c\u67e5\u8a62\u7684\u7d50\u69cb\u4e0d\u6b63\u78ba\u3002<\/li>\n<li>\u905e\u6b78\u67e5\u8a62\u7684\u7d42\u6b62\u689d\u4ef6\u672a\u6b63\u78ba\u8a2d\u7f6e\uff0c\u5c0e\u81f4\u7121\u9650\u905e\u6b78\u3002<\/li>\n<li>\u5728 CTE \u4e2d\u4f7f\u7528\u4e86\u4e0d\u6b63\u78ba\u7684\u5217\u540d\u6216\u8868\u540d\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u662f\u4e00\u500b\u53ef\u80fd\u5c0e\u81f4\u6b64\u932f\u8aa4\u7684\u905e\u6b78\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<pre><code>WITH RECURSIVE example AS (\n    SELECT id, parent_id FROM categories WHERE parent_id IS NULL\n    UNION ALL\n    SELECT c.id, c.parent_id FROM categories c\n    JOIN example e ON c.parent_id = e.id\n)\nSELECT * FROM example;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u5982\u679c `categories` \u8868\u4e2d\u5b58\u5728\u5faa\u74b0\u5f15\u7528\uff0c\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u932f\u8aa4 42P19\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9%e9%8c%af%e8%aa%a4-42p19-wQDtaQflUz\">\u5982\u4f55\u4fee\u5fa9\u932f\u8aa4 42P19<\/h2>\n<p>\u8981\u4fee\u5fa9\u932f\u8aa4 42P19\uff0c\u60a8\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e9%81%9e%e6%ad%b8%e6%9f%a5%e8%a9%a2%e7%9a%84%e7%b5%90%e6%a7%8b-wQDtaQflUz\">1. \u6aa2\u67e5\u905e\u6b78\u67e5\u8a62\u7684\u7d50\u69cb<\/h3>\n<p>\u78ba\u4fdd\u60a8\u7684 CTE \u7d50\u69cb\u6b63\u78ba\u3002\u905e\u6b78\u67e5\u8a62\u61c9\u8a72\u5305\u542b\u4e00\u500b\u57fa\u790e\u67e5\u8a62\u548c\u4e00\u500b\u905e\u6b78\u67e5\u8a62\u3002\u57fa\u790e\u67e5\u8a62\u61c9\u8a72\u80fd\u5920\u6b63\u78ba\u8fd4\u56de\u521d\u59cb\u7d50\u679c\uff0c\u800c\u905e\u6b78\u67e5\u8a62\u5247\u61c9\u8a72\u80fd\u5920\u9010\u6b65\u64f4\u5c55\u9019\u4e9b\u7d50\u679c\u3002<\/p>\n<h3 id=\"2-%e8%a8%ad%e7%bd%ae%e7%b5%82%e6%ad%a2%e6%a2%9d%e4%bb%b6-wQDtaQflUz\">2. \u8a2d\u7f6e\u7d42\u6b62\u689d\u4ef6<\/h3>\n<p>\u5728\u905e\u6b78\u67e5\u8a62\u4e2d\uff0c\u5fc5\u9808\u8a2d\u7f6e\u660e\u78ba\u7684\u7d42\u6b62\u689d\u4ef6\uff0c\u4ee5\u9632\u6b62\u7121\u9650\u905e\u6b78\u3002\u9019\u53ef\u4ee5\u901a\u904e\u5728\u905e\u6b78\u67e5\u8a62\u4e2d\u6dfb\u52a0\u9069\u7576\u7684\u904e\u6ffe\u689d\u4ef6\u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>WITH RECURSIVE example AS (\n    SELECT id, parent_id FROM categories WHERE parent_id IS NULL\n    UNION ALL\n    SELECT c.id, c.parent_id FROM categories c\n    JOIN example e ON c.parent_id = e.id\n    WHERE c.id IS NOT NULL  -- \u6dfb\u52a0\u7d42\u6b62\u689d\u4ef6\n)\nSELECT * FROM example;\n<\/code><\/pre>\n<h3 id=\"3-%e6%aa%a2%e6%9f%a5%e5%88%97%e5%90%8d%e5%92%8c%e8%a1%a8%e5%90%8d-wQDtaQflUz\">3. \u6aa2\u67e5\u5217\u540d\u548c\u8868\u540d<\/h3>\n<p>\u78ba\u4fdd\u5728 CTE \u4e2d\u4f7f\u7528\u7684\u5217\u540d\u548c\u8868\u540d\u6b63\u78ba\u7121\u8aa4\u3002\u4efb\u4f55\u62fc\u5beb\u932f\u8aa4\u6216\u4e0d\u6b63\u78ba\u7684\u5f15\u7528\u90fd\u53ef\u80fd\u5c0e\u81f4\u932f\u8aa4 42P19\u3002<\/p>\n<h3 id=\"4-%e6%b8%ac%e8%a9%a6%e6%9f%a5%e8%a9%a2-wQDtaQflUz\">4. \u6e2c\u8a66\u67e5\u8a62<\/h3>\n<p>\u5728\u9032\u884c\u4fee\u6539\u5f8c\uff0c\u8acb\u52d9\u5fc5\u6e2c\u8a66\u67e5\u8a62\u4ee5\u78ba\u4fdd\u5176\u6b63\u5e38\u904b\u884c\u3002\u53ef\u4ee5\u4f7f\u7528\u5c0f\u578b\u6578\u64da\u96c6\u9032\u884c\u6e2c\u8a66\uff0c\u4ee5\u4fbf\u5feb\u901f\u6aa2\u67e5\u67e5\u8a62\u7684\u6b63\u78ba\u6027\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-wQDtaQflUz\">\u7d50\u8ad6<\/h2>\n<p>\u932f\u8aa4\u4ee3\u78bc 42P19 &#8211; invalid_recursion \u662f PostgreSQL \u4e2d\u5e38\u898b\u7684\u932f\u8aa4\u4e4b\u4e00\uff0c\u901a\u5e38\u8207\u905e\u6b78\u67e5\u8a62\u7684\u7d50\u69cb\u6709\u95dc\u3002\u901a\u904e\u6aa2\u67e5\u67e5\u8a62\u7684\u7d50\u69cb\u3001\u8a2d\u7f6e\u7d42\u6b62\u689d\u4ef6\u4ee5\u53ca\u78ba\u4fdd\u5217\u540d\u548c\u8868\u540d\u7684\u6b63\u78ba\u6027\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u6b64\u932f\u8aa4\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u670d\u52d9\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42P19 &#8211; invalid_recursion\uff0c\u89e3\u6c7a\u905e\u6b78\u67e5\u8a62\u554f\u984c\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\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-179056","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179056","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=179056"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179056\/revisions"}],"predecessor-version":[{"id":179057,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179056\/revisions\/179057"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179056"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179056"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179056"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}