{"id":170089,"date":"2024-11-06T21:03:20","date_gmt":"2024-11-06T13:03:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/170089\/"},"modified":"2024-11-06T21:03:21","modified_gmt":"2024-11-06T13:03:21","slug":"%e4%bd%a0%e7%9f%a5%e9%81%93mysql%e4%b8%ad%e7%9a%84%e6%b8%b8%e6%a8%99%e5%97%8e%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/170089\/","title":{"rendered":"\u4f60\u77e5\u9053MySQL\u4e2d\u7684\u6e38\u6a19\u55ce\uff1f"},"content":{"rendered":"<h1 id=\"%e4%bd%a0%e7%9f%a5%e9%81%93mysql%e4%b8%ad%e7%9a%84%e6%b8%b8%e6%a8%99%e5%97%8e%ef%bc%9f-JfSmyjNQvl\">\u4f60\u77e5\u9053MySQL\u4e2d\u7684\u6e38\u6a19\u55ce\uff1f<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u6e38\u6a19\uff08Cursor\uff09\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u8907\u96dc\u67e5\u8a62\u548c\u591a\u884c\u7d50\u679c\u96c6\u6642\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u6e38\u6a19\u7684\u529f\u80fd\u4f86\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u64cd\u4f5c\u8cc7\u6599\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684\u6e38\u6a19\uff0c\u5305\u62ec\u5176\u5b9a\u7fa9\u3001\u4f7f\u7528\u60c5\u5883\u3001\u64cd\u4f5c\u6b65\u9a5f\u53ca\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%b8%b8%e6%a8%99%ef%bc%9f-JfSmyjNQvl\">\u4ec0\u9ebc\u662f\u6e38\u6a19\uff1f<\/h2>\n<p>\u6e38\u6a19\u662f\u4e00\u7a2e\u8cc7\u6599\u5eab\u5c0d\u8c61\uff0c\u5141\u8a31\u7528\u6236\u9010\u884c\u8655\u7406\u67e5\u8a62\u7d50\u679c\u96c6\u3002\u7576\u67e5\u8a62\u8fd4\u56de\u591a\u884c\u8cc7\u6599\u6642\uff0c\u6e38\u6a19\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u9010\u884c\u6aa2\u7d22\u548c\u64cd\u4f5c\u9019\u4e9b\u8cc7\u6599\uff0c\u800c\u4e0d\u5fc5\u4e00\u6b21\u6027\u5c07\u6240\u6709\u8cc7\u6599\u8f09\u5165\u8a18\u61b6\u9ad4\u3002\u9019\u5728\u8655\u7406\u5927\u578b\u8cc7\u6599\u96c6\u6642\u7279\u5225\u6709\u7528\uff0c\u56e0\u70ba\u5b83\u53ef\u4ee5\u6e1b\u5c11\u8a18\u61b6\u9ad4\u7684\u4f7f\u7528\u4e26\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n<h2 id=\"%e6%b8%b8%e6%a8%99%e7%9a%84%e4%bd%bf%e7%94%a8%e6%83%85%e5%a2%83-JfSmyjNQvl\">\u6e38\u6a19\u7684\u4f7f\u7528\u60c5\u5883<\/h2>\n<p>\u6e38\u6a19\u901a\u5e38\u5728\u4ee5\u4e0b\u60c5\u5883\u4e2d\u4f7f\u7528\uff1a<\/p>\n<ul>\n<li>\u9700\u8981\u9010\u884c\u8655\u7406\u67e5\u8a62\u7d50\u679c\u7684\u60c5\u6cc1\uff0c\u4f8b\u5982\u5728\u5831\u544a\u751f\u6210\u6216\u6578\u64da\u9077\u79fb\u6642\u3002<\/li>\n<li>\u9700\u8981\u5728\u67e5\u8a62\u7d50\u679c\u4e2d\u9032\u884c\u8907\u96dc\u7684\u8a08\u7b97\u6216\u908f\u8f2f\u8655\u7406\u6642\u3002<\/li>\n<li>\u9700\u8981\u5728\u591a\u884c\u7d50\u679c\u4e2d\u9032\u884c\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u6642\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e4%bd%bf%e7%94%a8%e6%b8%b8%e6%a8%99-JfSmyjNQvl\">\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u6e38\u6a19<\/h2>\n<p>\u5728MySQL\u4e2d\u4f7f\u7528\u6e38\u6a19\u7684\u57fa\u672c\u6b65\u9a5f\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u5ba3\u544a\u6e38\u6a19\uff1a\u4f7f\u7528 <code>DECLARE<\/code> \u8a9e\u53e5\u4f86\u5ba3\u544a\u6e38\u6a19\u3002<\/li>\n<li>\u6253\u958b\u6e38\u6a19\uff1a\u4f7f\u7528 <code>OPEN<\/code> \u8a9e\u53e5\u4f86\u6253\u958b\u6e38\u6a19\u3002<\/li>\n<li>\u63d0\u53d6\u8cc7\u6599\uff1a\u4f7f\u7528 <code>FETCH<\/code> \u8a9e\u53e5\u4f86\u9010\u884c\u63d0\u53d6\u8cc7\u6599\u3002<\/li>\n<li>\u95dc\u9589\u6e38\u6a19\uff1a\u4f7f\u7528 <code>CLOSE<\/code> \u8a9e\u53e5\u4f86\u95dc\u9589\u6e38\u6a19\u3002<\/li>\n<li>\u91cb\u653e\u6e38\u6a19\uff1a\u4f7f\u7528 <code>DEALLOCATE<\/code> \u8a9e\u53e5\u4f86\u91cb\u653e\u6e38\u6a19\u8cc7\u6e90\u3002<\/li>\n<\/ol>\n<h3 id=\"%e7%af%84%e4%be%8b-JfSmyjNQvl\">\u7bc4\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u6e38\u6a19\uff1a<\/p>\n<pre><code>\nDELIMITER \/\/\n\nCREATE PROCEDURE process_cursor()\nBEGIN\n    DECLARE done INT DEFAULT FALSE;\n    DECLARE user_id INT;\n    DECLARE user_name VARCHAR(100);\n    \n    -- \u5ba3\u544a\u6e38\u6a19\n    DECLARE user_cursor CURSOR FOR \n        SELECT id, name FROM users;\n    \n    -- \u7576\u6e38\u6a19\u7d50\u675f\u6642\u7684\u8655\u7406\n    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;\n\n    -- \u6253\u958b\u6e38\u6a19\n    OPEN user_cursor;\n\n    -- \u9010\u884c\u63d0\u53d6\u8cc7\u6599\n    read_loop: LOOP\n        FETCH user_cursor INTO user_id, user_name;\n        IF done THEN\n            LEAVE read_loop;\n        END IF;\n        -- \u5728\u9019\u88e1\u53ef\u4ee5\u5c0d\u6bcf\u4e00\u884c\u8cc7\u6599\u9032\u884c\u8655\u7406\n        SELECT CONCAT('User ID: ', user_id, ', User Name: ', user_name);\n    END LOOP;\n\n    -- \u95dc\u9589\u6e38\u6a19\n    CLOSE user_cursor;\nEND \/\/\n\nDELIMITER ;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>process_cursor<\/code> \u7684\u5b58\u5132\u904e\u7a0b\uff0c\u8a72\u904e\u7a0b\u4f7f\u7528\u6e38\u6a19\u9010\u884c\u63d0\u53d6 <code>users<\/code> \u8868\u4e2d\u7684\u8cc7\u6599\u3002\u6bcf\u6b21\u63d0\u53d6\u4e00\u884c\u8cc7\u6599\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u6839\u64da\u9700\u8981\u9032\u884c\u8655\u7406\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-JfSmyjNQvl\">\u7e3d\u7d50<\/h2>\n<p>\u6e38\u6a19\u5728MySQL\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u6709\u6548\u5730\u8655\u7406\u591a\u884c\u67e5\u8a62\u7d50\u679c\u3002\u96d6\u7136\u6e38\u6a19\u7684\u4f7f\u7528\u53ef\u80fd\u6703\u589e\u52a0\u7a0b\u5f0f\u7684\u8907\u96dc\u6027\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u5b83\u5011\u63d0\u4f9b\u4e86\u5fc5\u8981\u7684\u9748\u6d3b\u6027\u548c\u63a7\u5236\u529b\u3002\u5c0d\u65bc\u9700\u8981\u5728\u8cc7\u6599\u5eab\u4e2d\u9032\u884c\u8907\u96dc\u64cd\u4f5c\u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u7406\u89e3\u548c\u638c\u63e1\u6e38\u6a19\u7684\u4f7f\u7528\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\uff0c\u7279\u5225\u662f\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u89e3\u6c7a\u65b9\u6848\uff0c\u9019\u5c07\u6709\u52a9\u65bc\u60a8\u5728\u96f2\u7aef\u74b0\u5883\u4e2d\u66f4\u597d\u5730\u7ba1\u7406\u60a8\u7684\u8cc7\u6599\u5eab\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684\u6e38\u6807\uff0c\u638c\u63e1\u5982\u4f55\u4f7f\u7528\u6e38\u6807\u904d\u5386\u67e5\u8be2\u7ed3\u679c\u96c6\uff0c\u63d0\u5347\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u7075\u6d3b\u6027\u4e0e\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-170089","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/170089","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=170089"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/170089\/revisions"}],"predecessor-version":[{"id":170090,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/170089\/revisions\/170090"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=170089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=170089"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=170089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}