{"id":179180,"date":"2024-11-08T23:40:22","date_gmt":"2024-11-08T15:40:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179180\/"},"modified":"2024-11-08T23:40:23","modified_gmt":"2024-11-08T15:40:23","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%9ap0002-no_data_found%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179180\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1aP0002 &#8211; no_data_found\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%9ap0002-no_data_found%ef%bc%9f-nfSDusCWVV\">\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1aP0002 &#8211; no_data_found\uff1f<\/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\u5c31\u662f P0002 &#8211; no_data_found\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u8868\u793a\u5728\u57f7\u884c\u67e5\u8a62\u6642\uff0c\u7cfb\u7d71\u672a\u80fd\u627e\u5230\u7b26\u5408\u689d\u4ef6\u7684\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u6b64\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u8655\u7406\u6b64\u554f\u984c\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc-p0002-%e7%9a%84%e8%83%8c%e6%99%af-nfSDusCWVV\">\u932f\u8aa4\u4ee3\u78bc P0002 \u7684\u80cc\u666f<\/h2>\n<p>PostgreSQL \u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u7576\u4f60\u57f7\u884c\u4e00\u500b\u67e5\u8a62\u6216\u5b58\u5132\u904e\u7a0b\u6642\uff0c\u5982\u679c\u6c92\u6709\u627e\u5230\u4efb\u4f55\u7b26\u5408\u689d\u4ef6\u7684\u6578\u64da\uff0c\u7cfb\u7d71\u6703\u8fd4\u56de P0002 \u932f\u8aa4\u3002\u9019\u901a\u5e38\u767c\u751f\u5728\u4f7f\u7528 PL\/pgSQL \u8a9e\u8a00\u7de8\u5beb\u7684\u51fd\u6578\u4e2d\uff0c\u7279\u5225\u662f\u5728\u4f7f\u7528 <code>GET DIAGNOSTICS<\/code> \u6216 <code>RETURN QUERY<\/code> \u8a9e\u53e5\u6642\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e5%8e%9f%e5%9b%a0-nfSDusCWVV\">\u5e38\u898b\u539f\u56e0<\/h2>\n<ul>\n<li><strong>\u67e5\u8a62\u689d\u4ef6\u4e0d\u6b63\u78ba\uff1a<\/strong>\u5982\u679c\u67e5\u8a62\u7684\u689d\u4ef6\u904e\u65bc\u56b4\u683c\uff0c\u53ef\u80fd\u5c0e\u81f4\u6c92\u6709\u6578\u64da\u8fd4\u56de\u3002<\/li>\n<li><strong>\u6578\u64da\u5eab\u4e2d\u7121\u6578\u64da\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u76ee\u6a19\u8868\u4e2d\u53ef\u80fd\u6839\u672c\u6c92\u6709\u6578\u64da\u3002<\/li>\n<li><strong>\u932f\u8aa4\u7684\u6578\u64da\u985e\u578b\uff1a<\/strong>\u5982\u679c\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u4e0d\u6b63\u78ba\u7684\u6578\u64da\u985e\u578b\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u67e5\u8a62\u7121\u6cd5\u6b63\u78ba\u57f7\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-p0002-%e9%8c%af%e8%aa%a4-nfSDusCWVV\">\u5982\u4f55\u4fee\u5fa9 P0002 \u932f\u8aa4<\/h2>\n<p>\u4fee\u5fa9 P0002 \u932f\u8aa4\u7684\u904e\u7a0b\u901a\u5e38\u6d89\u53ca\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e6%9f%a5%e8%a9%a2%e6%a2%9d%e4%bb%b6-nfSDusCWVV\">1. \u6aa2\u67e5\u67e5\u8a62\u689d\u4ef6<\/h3>\n<p>\u9996\u5148\uff0c\u6aa2\u67e5\u4f60\u7684\u67e5\u8a62\u689d\u4ef6\u662f\u5426\u6b63\u78ba\u3002\u78ba\u4fdd\u4f60\u6240\u4f7f\u7528\u7684\u689d\u4ef6\u80fd\u5920\u5339\u914d\u5230\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u65e5\u671f\u7bc4\u570d\uff0c\u8acb\u78ba\u8a8d\u8a72\u7bc4\u570d\u5167\u78ba\u5be6\u5b58\u5728\u6578\u64da\u3002<\/p>\n<pre><code>SELECT * FROM your_table WHERE date_column BETWEEN '2023-01-01' AND '2023-01-31';<\/code><\/pre>\n<h3 id=\"2-%e7%a2%ba%e8%aa%8d%e6%95%b8%e6%93%9a%e5%ad%98%e5%9c%a8-nfSDusCWVV\">2. \u78ba\u8a8d\u6578\u64da\u5b58\u5728<\/h3>\n<p>\u5728\u57f7\u884c\u67e5\u8a62\u4e4b\u524d\uff0c\u53ef\u4ee5\u5148\u57f7\u884c\u4e00\u500b\u7c21\u55ae\u7684\u67e5\u8a62\u4f86\u78ba\u8a8d\u76ee\u6a19\u8868\u4e2d\u662f\u5426\u6709\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT COUNT(*) FROM your_table;<\/code><\/pre>\n<p>\u5982\u679c\u8fd4\u56de\u7684\u8a08\u6578\u70ba\u96f6\uff0c\u5247\u8868\u793a\u8868\u4e2d\u6c92\u6709\u6578\u64da\u3002<\/p>\n<h3 id=\"3-%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-nfSDusCWVV\">3. \u6aa2\u67e5\u6578\u64da\u985e\u578b<\/h3>\n<p>\u78ba\u4fdd\u67e5\u8a62\u4e2d\u4f7f\u7528\u7684\u6578\u64da\u985e\u578b\u8207\u6578\u64da\u5eab\u4e2d\u5b58\u5132\u7684\u6578\u64da\u985e\u578b\u76f8\u7b26\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u7684\u8868\u4e2d\u5b58\u5132\u7684\u662f\u6574\u6578\u985e\u578b\uff0c\u800c\u67e5\u8a62\u4e2d\u4f7f\u7528\u7684\u662f\u5b57\u7b26\u4e32\u985e\u578b\uff0c\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u67e5\u8a62\u5931\u6557\u3002<\/p>\n<pre><code>SELECT * FROM your_table WHERE id = '123'; -- \u932f\u8aa4\uff0c\u61c9\u8a72\u662f\u6574\u6578<\/code><\/pre>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8%e4%be%8b%e5%a4%96%e8%99%95%e7%90%86-nfSDusCWVV\">4. \u4f7f\u7528\u4f8b\u5916\u8655\u7406<\/h3>\n<p>\u5728 PL\/pgSQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4f8b\u5916\u8655\u7406\u4f86\u6355\u7372 P0002 \u932f\u8aa4\uff0c\u4e26\u6839\u64da\u9700\u8981\u9032\u884c\u76f8\u61c9\u7684\u8655\u7406\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>BEGIN\n    -- \u5617\u8a66\u57f7\u884c\u67e5\u8a62\n    PERFORM your_function();\nEXCEPTION\n    WHEN no_data_found THEN\n        RAISE NOTICE '\u672a\u627e\u5230\u6578\u64da';\nEND;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-nfSDusCWVV\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u932f\u8aa4\u4ee3\u78bc P0002 &#8211; no_data_found \u901a\u5e38\u662f\u7531\u65bc\u67e5\u8a62\u689d\u4ef6\u4e0d\u6b63\u78ba\u3001\u6578\u64da\u5eab\u4e2d\u7121\u6578\u64da\u6216\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\u7b49\u539f\u56e0\u5f15\u8d77\u7684\u3002\u901a\u904e\u6aa2\u67e5\u67e5\u8a62\u689d\u4ef6\u3001\u78ba\u8a8d\u6578\u64da\u5b58\u5728\u3001\u6aa2\u67e5\u6578\u64da\u985e\u578b\u4ee5\u53ca\u4f7f\u7528\u4f8b\u5916\u8655\u7406\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u6b64\u932f\u8aa4\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u904b\u884c\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u670d\u52d9\u4f86\u6258\u7ba1 PostgreSQL \u6578\u64da\u5eab\u4e5f\u662f\u4e00\u500b\u660e\u667a\u7684\u9078\u64c7\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u53ef\u7528\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc P0002 &#8211; no_data_found\uff0c\u89e3\u6c7a\u67e5\u8a62\u7121\u7d50\u679c\u7684\u554f\u984c\uff0c\u63d0\u5347\u6578\u64da\u5eab\u64cd\u4f5c\u6548\u7387\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-179180","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179180","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=179180"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179180\/revisions"}],"predecessor-version":[{"id":179181,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179180\/revisions\/179181"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179180"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}