{"id":21497,"date":"2024-01-02T10:22:21","date_gmt":"2024-01-02T10:22:21","guid":{"rendered":"https:\/\/server.hk\/blog\/21497\/"},"modified":"2024-11-14T10:33:09","modified_gmt":"2024-11-14T02:33:09","slug":"how-to-fix-postgresql-error-code-p0002-no_data_found","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/21497\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1aP0002 – no_data_found"},"content":{"rendered":"

\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1aP0002 – no_data_found<\/h1>\n

PostgreSQL \u662f\u4e00\u500b\u5f37\u5927\u7684\u958b\u6e90\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u88ab\u5ee3\u6cdb\u7528\u65bc\u5404\u985e\u61c9\u7528\u7a0b\u5f0f\u4e2d\u3002\u4e0d\u904e\uff0c\u8207\u4efb\u4f55\u8edf\u4ef6\u4e00\u6a23\uff0c\u5b83\u4e5f\u53ef\u80fd\u6703\u9047\u5230\u9700\u8981\u89e3\u6c7a\u7684\u932f\u8aa4\u3002\u5176\u4e2d\u4e00\u500b\u5e38\u898b\u932f\u8aa4\u662f P0002 \u932f\u8aa4\u4ee3\u78bc\uff0c\u5177\u9ad4\u70ba “no_data_found” \u932f\u8aa4\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u542b\u7fa9\u4e26\u63d0\u4f9b\u4fee\u5fa9\u6b65\u9a5f\u3002<\/p>\n

\u7406\u89e3 P0002 \u932f\u8aa4\u4ee3\u78bc<\/h2>\n

PostgreSQL \u4e2d\u7684 P0002 \u932f\u8aa4\u4ee3\u78bc\u8868\u793a SELECT INTO \u8a9e\u53e5\u6216 FETCH \u8a9e\u53e5\u6c92\u6709\u627e\u5230\u4efb\u4f55\u6578\u64da\u3002\u8a72\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u57f7\u884c\u67e5\u8a62\u6642\uff0c\u7d50\u679c\u96c6\u70ba\u7a7a\u3002\u5b83\u53ef\u80fd\u7531\u591a\u7a2e\u56e0\u7d20\u5f15\u8d77\uff0c\u4f8b\u5982\u932f\u8aa4\u7684\u67e5\u8a62\u8a9e\u6cd5\u3001\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\u6216\u8868\u683c\u70ba\u7a7a\u3002<\/p>\n

\u4fee\u5fa9 P0002 \u932f\u8aa4\u7684\u6b65\u9a5f<\/h2>\n

\u7576\u60a8\u5728 PostgreSQL \u4e2d\u9047\u5230 P0002 \u932f\u8aa4\u6642\uff0c\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u6b65\u9a5f\u4f86\u89e3\u6c7a\u554f\u984c\uff1a<\/p>\n

1. \u6aa2\u67e5\u67e5\u8a62\u8a9e\u6cd5<\/h3>\n

\u6aa2\u67e5\u89f8\u767c\u932f\u8aa4\u7684\u67e5\u8a62\uff0c\u78ba\u4fdd\u8a9e\u6cd5\u6b63\u78ba\u3002\u6aa2\u67e5\u662f\u5426\u6709\u907a\u6f0f\u6216\u932f\u8aa4\u7684\u95dc\u9375\u5b57\u3001\u62ec\u865f\u6216\u5f15\u865f\u3002\u6ce8\u610f\u8868\u540d\u548c\u5217\u540d\uff0c\u4ee5\u53ca\u67e5\u8a62\u4e2d\u4f7f\u7528\u7684\u5225\u540d\u3002<\/p>\n

2. \u9a57\u8b49\u6578\u64da\u985e\u578b<\/h3>\n

\u78ba\u4fdd\u67e5\u8a62\u4e2d\u4f7f\u7528\u7684\u6578\u64da\u985e\u578b\u8207\u8868\u4e2d\u7684\u5217\u6578\u64da\u985e\u578b\u5339\u914d\u3002\u5982\u679c\u6709\u4e0d\u5339\u914d\u7684\u60c5\u6cc1\uff0c\u4f8b\u5982\u5c07\u5b57\u7b26\u4e32\u8207\u6574\u6578\u9032\u884c\u6bd4\u8f03\uff0c\u5247\u53ef\u80fd\u6703\u5c0e\u81f4 “no_data_found” \u932f\u8aa4\u3002\u6839\u64da\u9700\u8981\u8abf\u6574\u67e5\u8a62\uff0c\u78ba\u4fdd\u6578\u64da\u985e\u578b\u76f8\u5bb9\u3002<\/p>\n

3. \u78ba\u8a8d\u8868\u683c\u6578\u64da<\/h3>\n

\u6aa2\u67e5\u88ab\u67e5\u8a62\u7684\u8868\u4e2d\u662f\u5426\u5305\u542b\u6578\u64da\u3002\u5982\u679c\u8868\u70ba\u7a7a\uff0c\u57f7\u884c SELECT INTO \u6216 FETCH \u8a9e\u53e5\u6703\u5c0e\u81f4 P0002 \u932f\u8aa4\u3002\u60a8\u53ef\u4ee5\u586b\u5145\u8868\u683c\u6578\u64da\u6216\u4fee\u6539\u67e5\u8a62\u4ee5\u9069\u7576\u8655\u7406\u7a7a\u7d50\u679c\u96c6\u3002<\/p>\n

4. \u4f7f\u7528\u7570\u5e38\u8655\u7406<\/h3>\n

\u5728 PostgreSQL \u4e2d\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u7570\u5e38\u8655\u7406\u4f86\u6355\u6349\u4e26\u8655\u7406\u932f\u8aa4\u3002\u901a\u904e\u5728\u4ee3\u78bc\u4e2d\u5be6\u73fe\u7570\u5e38\u584a\uff0c\u60a8\u53ef\u4ee5\u512a\u96c5\u5730\u8655\u7406 “no_data_found” \u932f\u8aa4\uff0c\u4e26\u57f7\u884c\u66ff\u4ee3\u64cd\u4f5c\u6216\u986f\u793a\u81ea\u5b9a\u7fa9\u932f\u8aa4\u4fe1\u606f\u3002\u8003\u616e\u4f7f\u7528 BEGIN…EXCEPTION…END \u584a\u4f86\u6709\u6548\u8655\u7406\u8a72\u932f\u8aa4\u3002<\/p>\n

5. \u4f7f\u7528 PRINT \u8a9e\u53e5\u9032\u884c\u8abf\u8a66<\/h3>\n

\u70ba\u4e86\u6392\u67e5 P0002 \u932f\u8aa4\uff0c\u60a8\u53ef\u4ee5\u5728\u4ee3\u78bc\u4e2d\u63d2\u5165 PRINT \u8a9e\u53e5\u6216\u4f7f\u7528 RAISE NOTICE \u547d\u4ee4\u3002\u9019\u4e9b\u8a9e\u53e5\u53ef\u4ee5\u5e6b\u52a9\u60a8\u78ba\u5b9a\u932f\u8aa4\u767c\u751f\u7684\u5177\u9ad4\u4f4d\u7f6e\uff0c\u4e26\u63d0\u4f9b\u6709\u95dc\u8b8a\u91cf\u6216\u5c0e\u81f4\u932f\u8aa4\u7684\u689d\u4ef6\u7684\u984d\u5916\u4fe1\u606f\u3002<\/p>\n

6. \u67e5\u95b1 PostgreSQL \u6587\u4ef6\u548c\u793e\u7fa4<\/h3>\n

\u5982\u679c\u4ee5\u4e0a\u6b65\u9a5f\u7121\u6cd5\u89e3\u6c7a P0002 \u932f\u8aa4\uff0c\u5efa\u8b70\u67e5\u95b1\u5b98\u65b9\u7684 PostgreSQL \u6587\u4ef6\u548c\u793e\u7fa4\u8cc7\u6e90\u3002PostgreSQL \u6587\u4ef6\u8a73\u7d30\u4ecb\u7d39\u4e86\u932f\u8aa4\u4ee3\u78bc\u53ca\u5176\u53ef\u80fd\u7684\u539f\u56e0\u3002\u6b64\u5916\uff0cPostgreSQL \u793e\u7fa4\u8ad6\u58c7\u548c\u90f5\u4ef6\u5217\u8868\u4e5f\u662f\u5f88\u597d\u7684\u652f\u6301\u4f86\u6e90\uff0c\u60a8\u53ef\u4ee5\u5f9e\u6709\u7d93\u9a57\u7684\u7528\u6236\u548c\u958b\u767c\u8005\u90a3\u88e1\u7372\u5f97\u5bf6\u8cb4\u7684\u898b\u89e3\u3002<\/p>\n

\u7e3d\u7d50<\/h2>\n

\u7e3d\u4e4b\uff0cPostgreSQL \u4e2d\u7684 P0002 \u932f\u8aa4\u4ee3\u78bc\uff0c\u7279\u5225\u662f “no_data_found” \u932f\u8aa4\uff0c\u8868\u660e SELECT INTO \u6216 FETCH \u8a9e\u53e5\u672a\u627e\u5230\u4efb\u4f55\u6578\u64da\u3002\u8981\u4fee\u5fa9\u6b64\u932f\u8aa4\uff0c\u8acb\u6aa2\u67e5\u67e5\u8a62\u8a9e\u6cd5\u3001\u9a57\u8b49\u6578\u64da\u985e\u578b\u3001\u78ba\u8a8d\u8868\u683c\u6578\u64da\u3001\u4f7f\u7528\u7570\u5e38\u8655\u7406\u3001\u901a\u904e PRINT \u8a9e\u53e5\u9032\u884c\u8abf\u8a66\uff0c\u4e26\u67e5\u95b1 PostgreSQL \u6587\u4ef6\u548c\u793e\u7fa4\u3002\u5982\u679c\u60a8\u9700\u8981\u53ef\u9760\u4e14\u9ad8\u6027\u80fd\u7684 VPS \u4e3b\u6a5f\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e Server.HK<\/a>\u3002\u6211\u5011\u7684\u9999\u6e2f VPS \u4e3b\u6a5f\u670d\u52d9\u70ba\u60a8\u7684 PostgreSQL \u53ca\u5176\u4ed6\u6578\u64da\u5eab\u9700\u6c42\u63d0\u4f9b\u9802\u7d1a\u6027\u80fd\u8207\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5982\u4f55\u4fee\u5fa9 PostgreSQL ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-21497","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21497","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=21497"}],"version-history":[{"count":2,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21497\/revisions"}],"predecessor-version":[{"id":23971,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21497\/revisions\/23971"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=21497"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=21497"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=21497"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}