{"id":179034,"date":"2024-11-08T22:27:19","date_gmt":"2024-11-08T14:27:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179034\/"},"modified":"2024-11-08T22:27:20","modified_gmt":"2024-11-08T14:27:20","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%9a42p08-ambiguous_parameter%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179034\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42P08 &#8211; ambiguous_parameter\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%9a42p08-ambiguous_parameter-ErhJrRQXdj\">\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42P08 &#8211; ambiguous_parameter<\/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 42P08\uff0c\u9019\u901a\u5e38\u8868\u793a\u5b58\u5728\u300c\u6a21\u7cca\u53c3\u6578\u300d\u7684\u554f\u984c\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u6210\u56e0\u3001\u5f71\u97ff\u4ee5\u53ca\u5982\u4f55\u6709\u6548\u5730\u4fee\u5fa9\u5b83\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc-42p08-%e7%9a%84%e6%88%90%e5%9b%a0-ErhJrRQXdj\">\u932f\u8aa4\u4ee3\u78bc 42P08 \u7684\u6210\u56e0<\/h2>\n<p>\u932f\u8aa4\u4ee3\u78bc 42P08 \u901a\u5e38\u51fa\u73fe\u5728 SQL \u67e5\u8a62\u4e2d\uff0c\u7576 PostgreSQL \u7121\u6cd5\u78ba\u5b9a\u4f7f\u7528\u54ea\u500b\u53c3\u6578\u6642\uff0c\u5c31\u6703\u5f15\u767c\u9019\u500b\u932f\u8aa4\u3002\u9019\u7a2e\u60c5\u6cc1\u901a\u5e38\u767c\u751f\u5728\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u6cc1\u4e0b\uff1a<\/p>\n<ul>\n<li><strong>\u91cd\u8907\u7684\u53c3\u6578\u540d\u7a31\uff1a<\/strong>\u5982\u679c\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u76f8\u540c\u7684\u53c3\u6578\u540d\u7a31\uff0cPostgreSQL \u53ef\u80fd\u7121\u6cd5\u6b63\u78ba\u89e3\u6790\u9019\u4e9b\u53c3\u6578\u3002<\/li>\n<li><strong>\u4f7f\u7528\u4e86\u4e0d\u6b63\u78ba\u7684\u4e0a\u4e0b\u6587\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53c3\u6578\u7684\u4f7f\u7528\u4e0a\u4e0b\u6587\u53ef\u80fd\u4e0d\u6b63\u78ba\uff0c\u5c0e\u81f4 PostgreSQL \u7121\u6cd5\u8b58\u5225\u3002<\/li>\n<li><strong>\u51fd\u6578\u6216\u5b50\u67e5\u8a62\u4e2d\u7684\u6a21\u7cca\u6027\uff1a<\/strong>\u7576\u5728\u51fd\u6578\u6216\u5b50\u67e5\u8a62\u4e2d\u4f7f\u7528\u53c3\u6578\u6642\uff0c\u5982\u679c\u53c3\u6578\u540d\u7a31\u8207\u5916\u90e8\u67e5\u8a62\u4e2d\u7684\u540d\u7a31\u76f8\u540c\uff0c\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u6a21\u7cca\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc-42p08-ErhJrRQXdj\">\u5982\u4f55\u4fee\u5fa9\u932f\u8aa4\u4ee3\u78bc 42P08<\/h2>\n<p>\u4fee\u5fa9\u932f\u8aa4\u4ee3\u78bc 42P08 \u7684\u65b9\u6cd5\u4e3b\u8981\u96c6\u4e2d\u5728\u6e05\u6670\u5730\u5b9a\u7fa9\u548c\u4f7f\u7528\u53c3\u6578\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5177\u9ad4\u7684\u6b65\u9a5f\u548c\u5efa\u8b70\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e5%8f%83%e6%95%b8%e5%90%8d%e7%a8%b1-ErhJrRQXdj\">1. \u6aa2\u67e5\u53c3\u6578\u540d\u7a31<\/h3>\n<p>\u9996\u5148\uff0c\u6aa2\u67e5 SQL \u67e5\u8a62\u4e2d\u6240\u6709\u53c3\u6578\u7684\u540d\u7a31\uff0c\u78ba\u4fdd\u6c92\u6709\u91cd\u8907\u7684\u540d\u7a31\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE id = $1 AND id = $2;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c$1 \u548c $2 \u90fd\u662f id\uff0c\u9019\u6703\u5c0e\u81f4\u6a21\u7cca\u6027\u3002\u61c9\u8a72\u6539\u70ba\u4f7f\u7528\u4e0d\u540c\u7684\u53c3\u6578\u540d\u7a31\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e6%98%8e%e7%a2%ba%e7%9a%84%e4%b8%8a%e4%b8%8b%e6%96%87-ErhJrRQXdj\">2. \u4f7f\u7528\u660e\u78ba\u7684\u4e0a\u4e0b\u6587<\/h3>\n<p>\u5728\u4f7f\u7528\u53c3\u6578\u6642\uff0c\u78ba\u4fdd\u5b83\u5011\u7684\u4e0a\u4e0b\u6587\u662f\u660e\u78ba\u7684\u3002\u4f8b\u5982\uff0c\u5728\u5b50\u67e5\u8a62\u4e2d\u4f7f\u7528\u53c3\u6578\u6642\uff0c\u61c9\u8a72\u4f7f\u7528\u5225\u540d\u4f86\u907f\u514d\u6df7\u6dc6\uff1a<\/p>\n<pre><code>SELECT * FROM (SELECT id AS user_id FROM users) AS subquery WHERE user_id = $1;<\/code><\/pre>\n<h3 id=\"3-%e9%81%bf%e5%85%8d%e5%85%a8%e5%b1%80%e8%ae%8a%e9%87%8f-ErhJrRQXdj\">3. \u907f\u514d\u5168\u5c40\u8b8a\u91cf<\/h3>\n<p>\u5982\u679c\u5728\u51fd\u6578\u4e2d\u4f7f\u7528\u5168\u5c40\u8b8a\u91cf\uff0c\u8acb\u78ba\u4fdd\u9019\u4e9b\u8b8a\u91cf\u4e0d\u6703\u8207\u51fd\u6578\u5167\u90e8\u7684\u53c3\u6578\u540d\u7a31\u885d\u7a81\u3002\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u4e0d\u540c\u7684\u547d\u540d\u898f\u5247\u4f86\u5340\u5206\u5b83\u5011\u3002<\/p>\n<h3 id=\"4-%e6%b8%ac%e8%a9%a6%e5%92%8c%e8%aa%bf%e8%a9%a6-ErhJrRQXdj\">4. \u6e2c\u8a66\u548c\u8abf\u8a66<\/h3>\n<p>\u5728\u4fee\u5fa9\u5f8c\uff0c\u9032\u884c\u6e2c\u8a66\u4ee5\u78ba\u4fdd\u554f\u984c\u5df2\u89e3\u6c7a\u3002\u53ef\u4ee5\u4f7f\u7528 PostgreSQL \u7684 EXPLAIN \u547d\u4ee4\u4f86\u6aa2\u67e5\u67e5\u8a62\u8a08\u5283\uff0c\u78ba\u4fdd\u53c3\u6578\u88ab\u6b63\u78ba\u89e3\u6790\u3002<\/p>\n<pre><code>EXPLAIN SELECT * FROM users WHERE id = $1;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-ErhJrRQXdj\">\u7d50\u8ad6<\/h2>\n<p>\u932f\u8aa4\u4ee3\u78bc 42P08 &#8211; ambiguous_parameter \u662f PostgreSQL \u4e2d\u5e38\u898b\u7684\u554f\u984c\u4e4b\u4e00\uff0c\u4e3b\u8981\u7531\u65bc\u53c3\u6578\u540d\u7a31\u7684\u6a21\u7cca\u6027\u5f15\u8d77\u3002\u901a\u904e\u6aa2\u67e5\u53c3\u6578\u540d\u7a31\u3001\u4f7f\u7528\u660e\u78ba\u7684\u4e0a\u4e0b\u6587\u3001\u907f\u514d\u5168\u5c40\u8b8a\u91cf\u4ee5\u53ca\u9032\u884c\u5145\u5206\u7684\u6e2c\u8a66\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u9019\u500b\u932f\u8aa4\u3002\u5c0d\u65bc\u4f7f\u7528 PostgreSQL \u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u7406\u89e3\u9019\u4e9b\u539f\u5247\u5c07\u6709\u52a9\u65bc\u63d0\u9ad8\u67e5\u8a62\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u8b80\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9084\u662f\u5176\u4ed6\u5730\u5340\u7684\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42P08 \u7684\u65b9\u6cd5\uff0c\u89e3\u6c7a\u6a21\u7cca\u53c3\u6578\u554f\u984c\uff0c\u78ba\u4fdd\u67e5\u8a62\u6b63\u78ba\u57f7\u884c\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-179034","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179034","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=179034"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179034\/revisions"}],"predecessor-version":[{"id":179035,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179034\/revisions\/179035"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179034"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179034"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179034"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}