{"id":96836,"date":"2024-10-20T12:46:16","date_gmt":"2024-10-20T04:46:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96836\/"},"modified":"2024-10-20T12:46:17","modified_gmt":"2024-10-20T04:46:17","slug":"postgresql-42p03-%e9%87%8d%e8%a4%87%e7%9a%84%e6%b8%b8%e6%a8%99-%e6%8a%a5%e9%94%99-%e6%95%85%e9%9a%9c%e4%bf%ae%e5%a4%8d-%e8%bf%9c%e7%a8%8b%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96836\/","title":{"rendered":"PostgreSQL 42P03: \u91cd\u8907\u7684\u6e38\u6a19 \u62a5\u9519 \u6545\u969c\u4fee\u590d \u8fdc\u7a0b\u5904\u7406"},"content":{"rendered":"<h1 id=\"postgresql-42p03-%e9%87%8d%e8%a4%87%e7%9a%84%e6%b8%b8%e6%a8%99%e5%a0%b1%e9%8c%af%e6%95%85%e9%9a%9c%e4%bf%ae%e5%be%a9%e9%81%a0%e7%a8%8b%e8%99%95%e7%90%86-QBvDlceBzi\">PostgreSQL 42P03: \u91cd\u8907\u7684\u6e38\u6a19\u5831\u932f\u6545\u969c\u4fee\u5fa9\u9060\u7a0b\u8655\u7406<\/h1>\n<p>\u5728\u4f7f\u7528 PostgreSQL \u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f 42P03 \u932f\u8aa4\uff0c\u9019\u901a\u5e38\u8868\u793a\u300c\u91cd\u8907\u7684\u6e38\u6a19\u300d\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u6210\u56e0\u3001\u5f71\u97ff\u4ee5\u53ca\u5982\u4f55\u9032\u884c\u6545\u969c\u4fee\u5fa9\uff0c\u7279\u5225\u662f\u5728\u9060\u7a0b\u8655\u7406\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-42p03-%e9%8c%af%e8%aa%a4%ef%bc%9f-QBvDlceBzi\">\u4ec0\u9ebc\u662f 42P03 \u932f\u8aa4\uff1f<\/h2>\n<p>PostgreSQL \u7684 42P03 \u932f\u8aa4\u4ee3\u78bc\u8868\u793a\u300c\u91cd\u8907\u7684\u6e38\u6a19\u300d\uff0c\u9019\u901a\u5e38\u767c\u751f\u5728\u5617\u8a66\u5275\u5efa\u4e00\u500b\u5df2\u7d93\u5b58\u5728\u7684\u6e38\u6a19\u6642\u3002\u6e38\u6a19\u662f\u4e00\u7a2e\u6578\u64da\u5eab\u5c0d\u8c61\uff0c\u7528\u65bc\u5728\u67e5\u8a62\u7d50\u679c\u4e2d\u9010\u884c\u8655\u7406\u6578\u64da\u3002\u7576\u4f60\u5728\u540c\u4e00\u500b\u6703\u8a71\u4e2d\u591a\u6b21\u5b9a\u7fa9\u76f8\u540c\u540d\u7a31\u7684\u6e38\u6a19\u6642\uff0c\u5c31\u6703\u5f15\u767c\u9019\u500b\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e7%9a%84%e6%88%90%e5%9b%a0-QBvDlceBzi\">\u932f\u8aa4\u7684\u6210\u56e0<\/h2>\n<p>\u9020\u6210 42P03 \u932f\u8aa4\u7684\u4e3b\u8981\u539f\u56e0\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u5728\u540c\u4e00\u500b\u6703\u8a71\u4e2d\u91cd\u8907\u5b9a\u7fa9\u6e38\u6a19\u3002<\/li>\n<li>\u672a\u6b63\u78ba\u95dc\u9589\u6216\u91cb\u653e\u4e4b\u524d\u5275\u5efa\u7684\u6e38\u6a19\u3002<\/li>\n<li>\u5728\u591a\u7dda\u7a0b\u6216\u591a\u7528\u6236\u74b0\u5883\u4e2d\uff0c\u6e38\u6a19\u540d\u7a31\u885d\u7a81\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-42p03-%e9%8c%af%e8%aa%a4-QBvDlceBzi\">\u5982\u4f55\u4fee\u5fa9 42P03 \u932f\u8aa4<\/h2>\n<p>\u4fee\u5fa9\u9019\u500b\u932f\u8aa4\u7684\u65b9\u6cd5\u4e3b\u8981\u6709\u4ee5\u4e0b\u5e7e\u7a2e\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e6%b8%b8%e6%a8%99%e5%90%8d%e7%a8%b1-QBvDlceBzi\">1. \u6aa2\u67e5\u6e38\u6a19\u540d\u7a31<\/h3>\n<p>\u9996\u5148\uff0c\u6aa2\u67e5\u4f60\u7684 SQL \u8a9e\u53e5\uff0c\u78ba\u4fdd\u6c92\u6709\u91cd\u8907\u5b9a\u7fa9\u76f8\u540c\u540d\u7a31\u7684\u6e38\u6a19\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>DECLARE my_cursor CURSOR FOR SELECT * FROM my_table;\nDECLARE my_cursor CURSOR FOR SELECT * FROM my_table; -- \u9019\u88e1\u6703\u5f15\u767c 42P03 \u932f\u8aa4\n<\/code><\/pre>\n<h3 id=\"2-%e9%97%9c%e9%96%89%e6%b8%b8%e6%a8%99-QBvDlceBzi\">2. \u95dc\u9589\u6e38\u6a19<\/h3>\n<p>\u5728\u91cd\u65b0\u5b9a\u7fa9\u6e38\u6a19\u4e4b\u524d\uff0c\u78ba\u4fdd\u95dc\u9589\u4e4b\u524d\u7684\u6e38\u6a19\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u4f86\u95dc\u9589\u6e38\u6a19\uff1a<\/p>\n<pre><code>CLOSE my_cursor;\n<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e4%b8%8d%e5%90%8c%e7%9a%84%e6%b8%b8%e6%a8%99%e5%90%8d%e7%a8%b1-QBvDlceBzi\">3. \u4f7f\u7528\u4e0d\u540c\u7684\u6e38\u6a19\u540d\u7a31<\/h3>\n<p>\u5982\u679c\u4f60\u9700\u8981\u5728\u540c\u4e00\u6703\u8a71\u4e2d\u4f7f\u7528\u591a\u500b\u6e38\u6a19\uff0c\u8003\u616e\u4f7f\u7528\u4e0d\u540c\u7684\u540d\u7a31\u4f86\u907f\u514d\u885d\u7a81\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>DECLARE my_cursor_1 CURSOR FOR SELECT * FROM my_table;\nDECLARE my_cursor_2 CURSOR FOR SELECT * FROM my_table;\n<\/code><\/pre>\n<h3 id=\"4-%e9%81%a0%e7%a8%8b%e8%99%95%e7%90%86%e4%b8%ad%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-QBvDlceBzi\">4. \u9060\u7a0b\u8655\u7406\u4e2d\u7684\u6ce8\u610f\u4e8b\u9805<\/h3>\n<p>\u5728\u9060\u7a0b\u8655\u7406\u7684\u60c5\u6cc1\u4e0b\uff0c\u7279\u5225\u662f\u5728\u4f7f\u7528\u591a\u500b\u9023\u63a5\u7684\u74b0\u5883\u4e2d\uff0c\u78ba\u4fdd\u6bcf\u500b\u9023\u63a5\u90fd\u4f7f\u7528\u7368\u7acb\u7684\u6e38\u6a19\u540d\u7a31\u3002\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u56e0\u70ba\u540d\u7a31\u885d\u7a81\u800c\u5c0e\u81f4\u7684\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-QBvDlceBzi\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u70ba\u4e86\u907f\u514d 42P03 \u932f\u8aa4\uff0c\u5efa\u8b70\u9075\u5faa\u4ee5\u4e0b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li>\u5728\u4f7f\u7528\u6e38\u6a19\u4e4b\u524d\uff0c\u59cb\u7d42\u6aa2\u67e5\u662f\u5426\u5df2\u7d93\u5b58\u5728\u540c\u540d\u6e38\u6a19\u3002<\/li>\n<li>\u5728\u4e0d\u518d\u9700\u8981\u6e38\u6a19\u6642\uff0c\u53ca\u6642\u95dc\u9589\u5b83\u5011\u3002<\/li>\n<li>\u5728\u591a\u7528\u6236\u74b0\u5883\u4e2d\uff0c\u4f7f\u7528\u552f\u4e00\u7684\u6e38\u6a19\u540d\u7a31\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-QBvDlceBzi\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u7684 42P03 \u932f\u8aa4\u662f\u7531\u65bc\u91cd\u8907\u7684\u6e38\u6a19\u5b9a\u7fa9\u5f15\u8d77\u7684\uff0c\u901a\u904e\u6aa2\u67e5\u6e38\u6a19\u540d\u7a31\u3001\u95dc\u9589\u4e0d\u518d\u9700\u8981\u7684\u6e38\u6a19\u4ee5\u53ca\u5728\u9060\u7a0b\u8655\u7406\u4e2d\u4f7f\u7528\u7368\u7279\u7684\u6e38\u6a19\u540d\u7a31\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u9019\u500b\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u904b\u884c\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u4e86\u89e3\u5982\u4f55\u8655\u7406\u9019\u985e\u932f\u8aa4\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u89e3\u51b3PostgreSQL 42P03\u9519\u8bef\uff1a\u91cd\u8907\u7684\u6e38\u6a19\u95ee\u9898\uff0c\u63d0\u4f9b\u6545\u969c\u4fee\u590d\u548c\u8fdc\u7a0b\u5904\u7406\u65b9\u6cd5\uff0c\u786e\u4fdd\u6570\u636e\u5e93\u64cd\u4f5c\u987a\u5229\u8fdb\u884c\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-96836","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96836","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=96836"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96836\/revisions"}],"predecessor-version":[{"id":96837,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96836\/revisions\/96837"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}