{"id":179022,"date":"2024-11-08T22:21:25","date_gmt":"2024-11-08T14:21:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179022\/"},"modified":"2024-11-08T22:21:26","modified_gmt":"2024-11-08T14:21:26","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%9a42p02-undefined_parameter%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179022\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42P02 &#8211; undefined_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%9a42p02-undefined_parameter-TskjyhXMGa\">\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42P02 &#8211; undefined_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 42P02\uff0c\u8a72\u932f\u8aa4\u901a\u5e38\u8868\u793a\u300cundefined_parameter\u300d\u3002\u9019\u610f\u5473\u8457\u5728\u57f7\u884c SQL \u67e5\u8a62\u6642\uff0c\u67d0\u500b\u53c3\u6578\u672a\u88ab\u6b63\u78ba\u5b9a\u7fa9\u6216\u50b3\u905e\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u6b64\u932f\u8aa4\u7684\u6210\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc-42p02-%e7%9a%84%e6%88%90%e5%9b%a0-TskjyhXMGa\">\u932f\u8aa4\u4ee3\u78bc 42P02 \u7684\u6210\u56e0<\/h2>\n<p>\u932f\u8aa4\u4ee3\u78bc 42P02 \u901a\u5e38\u51fa\u73fe\u5728\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u6cc1\u4e2d\uff1a<\/p>\n<ul>\n<li><strong>\u672a\u5b9a\u7fa9\u7684\u53c3\u6578\uff1a<\/strong>\u7576\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u672a\u5b9a\u7fa9\u7684\u53c3\u6578\u6642\uff0cPostgreSQL \u6703\u5831\u544a\u6b64\u932f\u8aa4\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86 $1 \u4f46\u672a\u63d0\u4f9b\u76f8\u61c9\u7684\u503c\uff0c\u5247\u6703\u51fa\u73fe\u6b64\u932f\u8aa4\u3002<\/li>\n<li><strong>\u932f\u8aa4\u7684\u53c3\u6578\u4f4d\u7f6e\uff1a<\/strong>\u5982\u679c\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u932f\u8aa4\u7684\u53c3\u6578\u4f4d\u7f6e\uff0cPostgreSQL \u4e5f\u6703\u7121\u6cd5\u8b58\u5225\u8a72\u53c3\u6578\uff0c\u5f9e\u800c\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<li><strong>SQL \u8a9e\u6cd5\u932f\u8aa4\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0cSQL \u8a9e\u6cd5\u932f\u8aa4\u53ef\u80fd\u6703\u5c0e\u81f4 PostgreSQL \u7121\u6cd5\u6b63\u78ba\u89e3\u6790\u53c3\u6578\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-42p02-TskjyhXMGa\">\u5982\u4f55\u4fee\u5fa9\u932f\u8aa4\u4ee3\u78bc 42P02<\/h2>\n<p>\u4fee\u5fa9\u6b64\u932f\u8aa4\u7684\u7b2c\u4e00\u6b65\u662f\u6aa2\u67e5 SQL \u67e5\u8a62\u4e2d\u4f7f\u7528\u7684\u6240\u6709\u53c3\u6578\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5177\u9ad4\u7684\u6b65\u9a5f\u548c\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e5%8f%83%e6%95%b8%e5%ae%9a%e7%be%a9-TskjyhXMGa\">1. \u6aa2\u67e5\u53c3\u6578\u5b9a\u7fa9<\/h3>\n<p>\u78ba\u4fdd\u5728\u57f7\u884c\u67e5\u8a62\u4e4b\u524d\uff0c\u6240\u6709\u53c3\u6578\u90fd\u5df2\u6b63\u78ba\u5b9a\u7fa9\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u53ef\u80fd\u6703\u5c0e\u81f4\u932f\u8aa4\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE id = $1;<\/code><\/pre>\n<p>\u5982\u679c\u5728\u57f7\u884c\u6b64\u67e5\u8a62\u6642\u672a\u63d0\u4f9b id \u7684\u503c\uff0c\u5247\u6703\u51fa\u73fe 42P02 \u932f\u8aa4\u3002\u78ba\u4fdd\u5728\u57f7\u884c\u67e5\u8a62\u6642\u63d0\u4f9b\u6b63\u78ba\u7684\u53c3\u6578\u503c\uff1a<\/p>\n<pre><code>PREPARE stmt AS SELECT * FROM users WHERE id = $1;\nEXECUTE stmt(1);<\/code><\/pre>\n<h3 id=\"2-%e6%aa%a2%e6%9f%a5%e5%8f%83%e6%95%b8%e4%bd%8d%e7%bd%ae-TskjyhXMGa\">2. \u6aa2\u67e5\u53c3\u6578\u4f4d\u7f6e<\/h3>\n<p>\u5982\u679c\u67e5\u8a62\u4e2d\u6709\u591a\u500b\u53c3\u6578\uff0c\u8acb\u78ba\u4fdd\u5b83\u5011\u7684\u4f4d\u7f6e\u6b63\u78ba\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM orders WHERE user_id = $1 AND status = $2;<\/code><\/pre>\n<p>\u5728\u57f7\u884c\u6b64\u67e5\u8a62\u6642\uff0c\u5fc5\u9808\u63d0\u4f9b\u5169\u500b\u53c3\u6578\u7684\u503c\uff0c\u5426\u5247\u5c07\u5c0e\u81f4\u932f\u8aa4\uff1a<\/p>\n<pre><code>PREPARE stmt AS SELECT * FROM orders WHERE user_id = $1 AND status = $2;\nEXECUTE stmt(1, 'completed');<\/code><\/pre>\n<h3 id=\"3-%e6%aa%a2%e6%9f%a5-sql-%e8%aa%9e%e6%b3%95-TskjyhXMGa\">3. \u6aa2\u67e5 SQL \u8a9e\u6cd5<\/h3>\n<p>\u6709\u6642\u5019\uff0cSQL \u8a9e\u6cd5\u932f\u8aa4\u4e5f\u6703\u5c0e\u81f4\u6b64\u932f\u8aa4\u3002\u6aa2\u67e5\u67e5\u8a62\u7684\u8a9e\u6cd5\u662f\u5426\u6b63\u78ba\uff0c\u4e26\u78ba\u4fdd\u6240\u6709\u7684\u95dc\u9375\u5b57\u548c\u6a19\u8b58\u7b26\u90fd\u6b63\u78ba\u7121\u8aa4\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e4%bf%ae%e5%be%a9-42p02-%e9%8c%af%e8%aa%a4-TskjyhXMGa\">\u793a\u4f8b\uff1a\u4fee\u5fa9 42P02 \u932f\u8aa4<\/h2>\n<p>\u5047\u8a2d\u4f60\u6709\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM products WHERE category_id = $1;<\/code><\/pre>\n<p>\u5982\u679c\u4f60\u5728\u57f7\u884c\u6642\u672a\u63d0\u4f9b category_id \u7684\u503c\uff0c\u5247\u6703\u51fa\u73fe\u932f\u8aa4\u3002\u4fee\u5fa9\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>PREPARE stmt AS SELECT * FROM products WHERE category_id = $1;\nEXECUTE stmt(2);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u78ba\u4fdd\u5728\u57f7\u884c\u67e5\u8a62\u6642\u63d0\u4f9b\u4e86\u6b63\u78ba\u7684\u53c3\u6578\u503c\uff0c\u9019\u6a23\u5c31\u80fd\u907f\u514d 42P02 \u932f\u8aa4\u7684\u767c\u751f\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-TskjyhXMGa\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42P02 &#8211; undefined_parameter \u901a\u5e38\u662f\u7531\u65bc\u672a\u5b9a\u7fa9\u6216\u932f\u8aa4\u4f4d\u7f6e\u7684\u53c3\u6578\u5f15\u8d77\u7684\u3002\u901a\u904e\u4ed4\u7d30\u6aa2\u67e5 SQL \u67e5\u8a62\u4e2d\u7684\u53c3\u6578\u5b9a\u7fa9\u3001\u4f4d\u7f6e\u53ca\u8a9e\u6cd5\uff0c\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 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42P02 &#8211; undefined_parameter\uff0c\u89e3\u6c7a\u67e5\u8a62\u4e2d\u7684\u672a\u5b9a\u7fa9\u53c3\u6578\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-179022","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179022","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=179022"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179022\/revisions"}],"predecessor-version":[{"id":179023,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179022\/revisions\/179023"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179022"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179022"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179022"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}