{"id":179182,"date":"2024-11-08T23:41:20","date_gmt":"2024-11-08T15:41:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179182\/"},"modified":"2024-11-08T23:41:21","modified_gmt":"2024-11-08T15:41:21","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%9ap0003-too_many_rows%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179182\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1aP0003 &#8211; too_many_rows\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%9ap0003-too_many_rows-qpNAmQBJOa\">\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1aP0003 &#8211; too_many_rows<\/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 P0003 &#8211; too_many_rows\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u57f7\u884c\u67e5\u8a62\u6642\uff0c\u7576\u67e5\u8a62\u8fd4\u56de\u7684\u884c\u6578\u8d85\u904e\u4e86\u9810\u671f\u7684\u6578\u91cf\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u539f\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%e5%8e%9f%e5%9b%a0%e5%88%86%e6%9e%90-qpNAmQBJOa\">\u932f\u8aa4\u539f\u56e0\u5206\u6790<\/h2>\n<p>PostgreSQL \u7684 P0003 \u932f\u8aa4\u901a\u5e38\u51fa\u73fe\u5728\u4f7f\u7528 PL\/pgSQL \u8a9e\u8a00\u7de8\u5beb\u7684\u51fd\u6578\u6216\u904e\u7a0b\u4e2d\u3002\u7576\u4e00\u500b\u67e5\u8a62\u7684\u7d50\u679c\u96c6\u8fd4\u56de\u4e86\u591a\u65bc\u4e00\u884c\u7684\u6578\u64da\uff0c\u800c\u51fd\u6578\u6216\u904e\u7a0b\u537b\u671f\u671b\u53ea\u8fd4\u56de\u4e00\u884c\u6642\uff0c\u5c31\u6703\u89f8\u767c\u9019\u500b\u932f\u8aa4\u3002\u9019\u7a2e\u60c5\u6cc1\u5e38\u898b\u65bc\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u5883\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528 SELECT INTO \u8a9e\u53e5\uff1a<\/strong>\u7576\u4f7f\u7528 SELECT INTO \u8a9e\u53e5\u6642\uff0c\u5982\u679c\u67e5\u8a62\u8fd4\u56de\u591a\u65bc\u4e00\u884c\uff0c\u5247\u6703\u5f15\u767c P0003 \u932f\u8aa4\u3002<\/li>\n<li><strong>\u4f7f\u7528 RETURN QUERY \u8a9e\u53e5\uff1a<\/strong>\u5728 PL\/pgSQL \u51fd\u6578\u4e2d\uff0c\u5982\u679c\u4f7f\u7528 RETURN QUERY \u4e26\u4e14\u671f\u671b\u8fd4\u56de\u55ae\u884c\u7d50\u679c\uff0c\u5247\u4e5f\u53ef\u80fd\u5c0e\u81f4\u6b64\u932f\u8aa4\u3002<\/li>\n<li><strong>\u4e0d\u6b63\u78ba\u7684 WHERE \u689d\u4ef6\uff1a<\/strong>\u5982\u679c\u67e5\u8a62\u7684 WHERE \u689d\u4ef6\u4e0d\u5920\u56b4\u683c\uff0c\u53ef\u80fd\u6703\u8fd4\u56de\u591a\u884c\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-p0003-%e9%8c%af%e8%aa%a4-qpNAmQBJOa\">\u5982\u4f55\u4fee\u5fa9 P0003 \u932f\u8aa4<\/h2>\n<p>\u4fee\u5fa9 P0003 \u932f\u8aa4\u7684\u95dc\u9375\u5728\u65bc\u78ba\u4fdd\u67e5\u8a62\u7684\u7d50\u679c\u96c6\u7b26\u5408\u9810\u671f\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u89e3\u6c7a\u65b9\u6848\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e6%9f%a5%e8%a9%a2%e6%a2%9d%e4%bb%b6-qpNAmQBJOa\">1. \u6aa2\u67e5\u67e5\u8a62\u689d\u4ef6<\/h3>\n<p>\u9996\u5148\uff0c\u6aa2\u67e5\u67e5\u8a62\u7684 WHERE \u689d\u4ef6\u662f\u5426\u8db3\u5920\u56b4\u683c\uff0c\u4ee5\u78ba\u4fdd\u53ea\u8fd4\u56de\u4e00\u884c\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u6b63\u5728\u67e5\u8a62\u7528\u6236\u4fe1\u606f\uff0c\u61c9\u8a72\u4f7f\u7528\u552f\u4e00\u7684\u6a19\u8b58\u7b26\uff0c\u5982\u7528\u6236 ID\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE user_id = 1;<\/code><\/pre>\n<p>\u5982\u679c\u6c92\u6709\u552f\u4e00\u7684\u6a19\u8b58\u7b26\uff0c\u5247\u53ef\u80fd\u9700\u8981\u6dfb\u52a0\u66f4\u591a\u7684\u689d\u4ef6\u4f86\u9650\u5236\u7d50\u679c\u96c6\u7684\u5927\u5c0f\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-limit-%e5%ad%90%e5%8f%a5-qpNAmQBJOa\">2. \u4f7f\u7528 LIMIT \u5b50\u53e5<\/h3>\n<p>\u5982\u679c\u4f60\u78ba\u5b9a\u67e5\u8a62\u53ef\u80fd\u8fd4\u56de\u591a\u884c\uff0c\u4f46\u53ea\u9700\u8981\u5176\u4e2d\u4e00\u884c\uff0c\u53ef\u4ee5\u4f7f\u7528 LIMIT \u5b50\u53e5\u4f86\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt; 18 LIMIT 1;<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8-array_agg-%e6%88%96-string_agg-%e5%87%bd%e6%95%b8-qpNAmQBJOa\">3. \u4f7f\u7528 ARRAY_AGG \u6216 STRING_AGG \u51fd\u6578<\/h3>\n<p>\u5982\u679c\u9700\u8981\u8fd4\u56de\u591a\u884c\u6578\u64da\uff0c\u4f46\u53c8\u5e0c\u671b\u5c07\u5176\u5408\u4f75\u70ba\u4e00\u884c\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528 ARRAY_AGG \u6216 STRING_AGG \u51fd\u6578\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT STRING_AGG(username, ', ') FROM users WHERE age &gt; 18;<\/code><\/pre>\n<h3 id=\"4-%e8%aa%bf%e6%95%b4%e5%87%bd%e6%95%b8%e9%82%8f%e8%bc%af-qpNAmQBJOa\">4. \u8abf\u6574\u51fd\u6578\u908f\u8f2f<\/h3>\n<p>\u5982\u679c\u932f\u8aa4\u767c\u751f\u5728 PL\/pgSQL \u51fd\u6578\u4e2d\uff0c\u5247\u53ef\u80fd\u9700\u8981\u91cd\u65b0\u8a2d\u8a08\u51fd\u6578\u7684\u908f\u8f2f\uff0c\u4ee5\u4fbf\u6b63\u78ba\u8655\u7406\u591a\u884c\u7d50\u679c\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 FOR LOOP \u4f86\u904d\u6b77\u7d50\u679c\u96c6\uff0c\u800c\u4e0d\u662f\u671f\u671b\u53ea\u8fd4\u56de\u4e00\u884c\uff1a<\/p>\n<pre><code>FOR record IN SELECT * FROM users WHERE age &gt; 18 LOOP\n    -- \u8655\u7406\u6bcf\u4e00\u884c\nEND LOOP;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-qpNAmQBJOa\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u7684 P0003 \u932f\u8aa4\u901a\u5e38\u662f\u7531\u65bc\u67e5\u8a62\u8fd4\u56de\u591a\u65bc\u4e00\u884c\u6578\u64da\u800c\u5f15\u8d77\u7684\u3002\u901a\u904e\u6aa2\u67e5\u67e5\u8a62\u689d\u4ef6\u3001\u4f7f\u7528 LIMIT \u5b50\u53e5\u3001\u5408\u4f75\u7d50\u679c\u6216\u8abf\u6574\u51fd\u6578\u908f\u8f2f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u9019\u500b\u932f\u8aa4\u3002\u4e86\u89e3\u5982\u4f55\u8655\u7406\u9019\u4e9b\u60c5\u6cc1\u4e0d\u50c5\u80fd\u63d0\u9ad8\u958b\u767c\u6548\u7387\uff0c\u9084\u80fd\u589e\u5f37\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u7a69\u5b9a\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 <a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc P0003 &#8211; too_many_rows\uff0c\u89e3\u6c7a\u67e5\u8a62\u8fd4\u56de\u904e\u591a\u884c\u7684\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-179182","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179182","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=179182"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179182\/revisions"}],"predecessor-version":[{"id":179183,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179182\/revisions\/179183"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}