{"id":178440,"date":"2024-11-08T17:59:17","date_gmt":"2024-11-08T09:59:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/178440\/"},"modified":"2024-11-08T17:59:18","modified_gmt":"2024-11-08T09:59:18","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41324-sqlstate-24000-er_sp_cursor_already_open-%e6%b8%b8%e6%a8%99%e5%b7%b2%e6%89%93%e9%96%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/178440\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41324 &#8211; SQLSTATE: 24000 (ER_SP_CURSOR_ALREADY_OPEN) \u6e38\u6a19\u5df2\u6253\u958b"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41324-sqlstate-24000-er_sp_cursor_already_open-%e6%b8%b8%e6%a8%99%e5%b7%b2%e6%89%93%e9%96%8b-CRIseFDVvy\">\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41324 &#8211; SQLSTATE: 24000 (ER_SP_CURSOR_ALREADY_OPEN) \u6e38\u6a19\u5df2\u6253\u958b<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u8cc7\u6599\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa41324\uff0c\u8a72\u932f\u8aa4\u7684SQLSTATE\u4ee3\u78bc\u70ba24000\uff0c\u8868\u793a\u201c\u6e38\u6a19\u5df2\u6253\u958b\u201d\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\uff0c\u7576\u4f60\u5617\u8a66\u91cd\u65b0\u6253\u958b\u4e00\u500b\u5df2\u7d93\u6253\u958b\u7684\u6e38\u6a19\u6642\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e5%8e%9f%e5%9b%a0-CRIseFDVvy\">\u932f\u8aa4\u539f\u56e0<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u6e38\u6a19\u662f\u4e00\u7a2e\u7528\u65bc\u904d\u6b77\u67e5\u8a62\u7d50\u679c\u7684\u6578\u64da\u7d50\u69cb\u3002\u7576\u4f60\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\u4f7f\u7528\u6e38\u6a19\u6642\uff0c\u5fc5\u9808\u9075\u5faa\u4e00\u5b9a\u7684\u6b65\u9a5f\u4f86\u6b63\u78ba\u7ba1\u7406\u5b83\u5011\u3002\u932f\u8aa41324\u901a\u5e38\u767c\u751f\u5728\u4ee5\u4e0b\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u5617\u8a66\u5728\u672a\u95dc\u9589\u7684\u60c5\u6cc1\u4e0b\u91cd\u65b0\u6253\u958b\u6e38\u6a19\u3002<\/li>\n<li>\u5728\u540c\u4e00\u5b58\u5132\u904e\u7a0b\u4e2d\u591a\u6b21\u6253\u958b\u540c\u4e00\u6e38\u6a19\u3002<\/li>\n<li>\u6e38\u6a19\u7684\u4f7f\u7528\u4e0d\u7b26\u5408MySQL\u7684\u8a9e\u6cd5\u898f\u7bc4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-CRIseFDVvy\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u8981\u4fee\u5fa9\u932f\u8aa41324\uff0c\u958b\u767c\u8005\u9700\u8981\u78ba\u4fdd\u5728\u91cd\u65b0\u6253\u958b\u6e38\u6a19\u4e4b\u524d\uff0c\u5148\u95dc\u9589\u5b83\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5177\u9ad4\u7684\u6b65\u9a5f\u548c\u793a\u4f8b\u4ee3\u78bc\uff0c\u5e6b\u52a9\u4f60\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff1a<\/p>\n<h3 id=\"1-%e7%a2%ba%e4%bf%9d%e9%97%9c%e9%96%89%e6%b8%b8%e6%a8%99-CRIseFDVvy\">1. \u78ba\u4fdd\u95dc\u9589\u6e38\u6a19<\/h3>\n<p>\u5728\u4f7f\u7528\u6e38\u6a19\u5f8c\uff0c\u61c9\u8a72\u4f7f\u7528 <code>CLOSE<\/code> \u8a9e\u53e5\u4f86\u95dc\u9589\u5b83\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nDECLARE my_cursor CURSOR FOR SELECT column_name FROM table_name;\nOPEN my_cursor;\n\n-- \u5728\u9019\u88e1\u9032\u884c\u4e00\u4e9b\u64cd\u4f5c\n\nCLOSE my_cursor;  -- \u78ba\u4fdd\u5728\u91cd\u65b0\u6253\u958b\u4e4b\u524d\u95dc\u9589\u6e38\u6a19\nOPEN my_cursor;   -- \u73fe\u5728\u53ef\u4ee5\u5b89\u5168\u5730\u91cd\u65b0\u6253\u958b\u6e38\u6a19\n<\/code><\/pre>\n<h3 id=\"2-%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-CRIseFDVvy\">2. \u4f7f\u7528\u4e0d\u540c\u7684\u6e38\u6a19\u540d\u7a31<\/h3>\n<p>\u5982\u679c\u9700\u8981\u5728\u540c\u4e00\u5b58\u5132\u904e\u7a0b\u4e2d\u4f7f\u7528\u591a\u500b\u6e38\u6a19\uff0c\u8acb\u78ba\u4fdd\u5b83\u5011\u7684\u540d\u7a31\u4e0d\u540c\u3002\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u540d\u7a31\u885d\u7a81\uff0c\u5f9e\u800c\u6e1b\u5c11\u932f\u8aa4\u7684\u767c\u751f\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>\nDECLARE cursor_one CURSOR FOR SELECT column_name FROM table_one;\nDECLARE cursor_two CURSOR FOR SELECT column_name FROM table_two;\n\nOPEN cursor_one;\n-- \u4f7f\u7528 cursor_one\nCLOSE cursor_one;\n\nOPEN cursor_two;  -- \u4f7f\u7528\u4e0d\u540c\u7684\u6e38\u6a19\u540d\u7a31\n<\/code><\/pre>\n<h3 id=\"3-%e6%aa%a2%e6%9f%a5%e6%b8%b8%e6%a8%99%e7%9a%84%e7%8b%80%e6%85%8b-CRIseFDVvy\">3. \u6aa2\u67e5\u6e38\u6a19\u7684\u72c0\u614b<\/h3>\n<p>\u5728\u6253\u958b\u6e38\u6a19\u4e4b\u524d\uff0c\u53ef\u4ee5\u6aa2\u67e5\u6e38\u6a19\u7684\u72c0\u614b\uff0c\u4ee5\u78ba\u4fdd\u5b83\u672a\u88ab\u6253\u958b\u3002\u96d6\u7136MySQL\u672c\u8eab\u4e0d\u63d0\u4f9b\u76f4\u63a5\u7684\u6e38\u6a19\u72c0\u614b\u6aa2\u67e5\uff0c\u4f46\u53ef\u4ee5\u901a\u904e\u8a2d\u8a08\u908f\u8f2f\u4f86\u907f\u514d\u91cd\u8907\u6253\u958b\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>\nDECLARE is_cursor_open INT DEFAULT 0;\n\nIF is_cursor_open = 0 THEN\n    OPEN my_cursor;\n    SET is_cursor_open = 1;  -- \u6a19\u8a18\u6e38\u6a19\u70ba\u5df2\u6253\u958b\nEND IF;\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-CRIseFDVvy\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u932f\u8aa41324\uff08SQLSTATE: 24000\uff09\u901a\u5e38\u662f\u7531\u65bc\u6e38\u6a19\u672a\u6b63\u78ba\u7ba1\u7406\u6240\u5f15\u8d77\u7684\u3002\u901a\u904e\u78ba\u4fdd\u5728\u91cd\u65b0\u6253\u958b\u6e38\u6a19\u4e4b\u524d\u95dc\u9589\u5b83\u3001\u4f7f\u7528\u4e0d\u540c\u7684\u6e38\u6a19\u540d\u7a31\u4ee5\u53ca\u6aa2\u67e5\u6e38\u6a19\u7684\u72c0\u614b\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u9019\u500b\u932f\u8aa4\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u6b63\u78ba\u7ba1\u7406\u6e38\u6a19\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u4f60\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u4f60\u8f15\u9b06\u7ba1\u7406\u4f60\u7684\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u6eff\u8db3\u4f60\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41324 (ER_SP_CURSOR_ALREADY_OPEN)\uff0c\u89e3\u6c7a\u6e38\u6a19\u5df2\u6253\u958b\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-178440","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178440","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=178440"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178440\/revisions"}],"predecessor-version":[{"id":178441,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178440\/revisions\/178441"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=178440"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=178440"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=178440"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}