{"id":179350,"date":"2024-11-09T01:05:21","date_gmt":"2024-11-08T17:05:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179350\/"},"modified":"2024-11-09T01:05:22","modified_gmt":"2024-11-08T17:05:22","slug":"%e5%a6%82%e4%bd%95%e7%94%a8%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e9%81%8d%e6%ad%b7%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e7%9a%84%e6%af%8f%e4%b8%80%e8%a1%8c%e6%95%b8%e6%93%9a%ef%bc%9f-%e5%ad%98%e5%84%b2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179350\/","title":{"rendered":"\u5982\u4f55\u7528\u5b58\u5132\u904e\u7a0b\u904d\u6b77\u6578\u64da\u5eab\u8868\u7684\u6bcf\u4e00\u884c\u6578\u64da\uff1f (\u5b58\u5132\u904e\u7a0b\u904d\u6b77\u8868\u7684\u6bcf\u4e00\u884c\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e7%94%a8%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e9%81%8d%e6%ad%b7%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e7%9a%84%e6%af%8f%e4%b8%80%e8%a1%8c%e6%95%b8%e6%93%9a%ef%bc%9f-ogOUCKQNvg\">\u5982\u4f55\u7528\u5b58\u5132\u904e\u7a0b\u904d\u6b77\u6578\u64da\u5eab\u8868\u7684\u6bcf\u4e00\u884c\u6578\u64da\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u5b58\u5132\u904e\u7a0b\u662f\u4e00\u7a2e\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u81ea\u52d5\u5316\u91cd\u8907\u6027\u4efb\u52d9\u3002\u7279\u5225\u662f\u5728\u9700\u8981\u904d\u6b77\u6578\u64da\u5eab\u8868\u7684\u6bcf\u4e00\u884c\u6578\u64da\u6642\uff0c\u5b58\u5132\u904e\u7a0b\u63d0\u4f9b\u4e86\u4e00\u7a2e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528\u5b58\u5132\u904e\u7a0b\u4f86\u904d\u6b77\u6578\u64da\u5eab\u8868\u7684\u6bcf\u4e00\u884c\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%ef%bc%9f-ogOUCKQNvg\">\u4ec0\u9ebc\u662f\u5b58\u5132\u904e\u7a0b\uff1f<\/h2>\n<p>\u5b58\u5132\u904e\u7a0b\u662f\u4e00\u7d44\u9810\u7de8\u8b6f\u7684 SQL \u8a9e\u53e5\uff0c\u5b58\u5132\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u53ef\u4ee5\u901a\u904e\u8abf\u7528\u4f86\u57f7\u884c\u3002\u5b83\u5011\u53ef\u4ee5\u63a5\u53d7\u53c3\u6578\uff0c\u4e26\u4e14\u53ef\u4ee5\u8fd4\u56de\u7d50\u679c\u3002\u5b58\u5132\u904e\u7a0b\u7684\u4e3b\u8981\u512a\u52e2\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u63d0\u9ad8\u6027\u80fd\uff1a\u7531\u65bc\u5b58\u5132\u904e\u7a0b\u662f\u9810\u7de8\u8b6f\u7684\uff0c\u56e0\u6b64\u57f7\u884c\u901f\u5ea6\u6bd4\u666e\u901a\u7684 SQL \u8a9e\u53e5\u5feb\u3002<\/li>\n<li>\u91cd\u7528\u6027\uff1a\u53ef\u4ee5\u5728\u591a\u500b\u61c9\u7528\u7a0b\u5e8f\u4e2d\u91cd\u7528\u76f8\u540c\u7684\u5b58\u5132\u904e\u7a0b\u3002<\/li>\n<li>\u5b89\u5168\u6027\uff1a\u53ef\u4ee5\u9650\u5236\u7528\u6236\u5c0d\u6578\u64da\u5eab\u7684\u76f4\u63a5\u8a2a\u554f\uff0c\u53ea\u5141\u8a31\u901a\u904e\u5b58\u5132\u904e\u7a0b\u9032\u884c\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%81%8d%e6%ad%b7%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%96%b9%e6%b3%95-ogOUCKQNvg\">\u904d\u6b77\u6578\u64da\u5eab\u8868\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>\u904d\u6b77\u6578\u64da\u5eab\u8868\u7684\u6bcf\u4e00\u884c\u6578\u64da\u901a\u5e38\u53ef\u4ee5\u901a\u904e\u6e38\u6a19\u4f86\u5be6\u73fe\u3002\u6e38\u6a19\u662f\u4e00\u7a2e\u6578\u64da\u5eab\u5c0d\u8c61\uff0c\u5141\u8a31\u9010\u884c\u8655\u7406\u67e5\u8a62\u7d50\u679c\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u5b58\u5132\u904e\u7a0b\u548c\u6e38\u6a19\u904d\u6b77\u6578\u64da\u5eab\u8868\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<ol>\n<li>\u5b9a\u7fa9\u6e38\u6a19\uff1a\u4f7f\u7528 SELECT \u8a9e\u53e5\u5b9a\u7fa9\u8981\u904d\u6b77\u7684\u6578\u64da\u3002<\/li>\n<li>\u6253\u958b\u6e38\u6a19\uff1a\u57f7\u884c\u6e38\u6a19\u4ee5\u7372\u53d6\u6578\u64da\u3002<\/li>\n<li>\u63d0\u53d6\u6578\u64da\uff1a\u4f7f\u7528 FETCH \u8a9e\u53e5\u9010\u884c\u63d0\u53d6\u6578\u64da\u3002<\/li>\n<li>\u95dc\u9589\u6e38\u6a19\uff1a\u5728\u5b8c\u6210\u64cd\u4f5c\u5f8c\u95dc\u9589\u6e38\u6a19\u4ee5\u91cb\u653e\u8cc7\u6e90\u3002<\/li>\n<li>\u91cb\u653e\u6e38\u6a19\uff1a\u522a\u9664\u6e38\u6a19\u4ee5\u6e05\u7406\u5167\u5b58\u3002<\/li>\n<\/ol>\n<h2 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc-ogOUCKQNvg\">\u793a\u4f8b\u4ee3\u78bc<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\u5b58\u5132\u904e\u7a0b\uff0c\u5c55\u793a\u5982\u4f55\u904d\u6b77\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\uff0c\u4e26\u6253\u5370\u6bcf\u4e00\u884c\u7684\u54e1\u5de5\u59d3\u540d\uff1a<\/p>\n<pre><code>\nDELIMITER \/\/\n\nCREATE PROCEDURE TraverseEmployees()\nBEGIN\n    DECLARE done INT DEFAULT FALSE;\n    DECLARE emp_name VARCHAR(100);\n    \n    -- \u5b9a\u7fa9\u6e38\u6a19\n    DECLARE emp_cursor CURSOR FOR SELECT name FROM employees;\n    \n    -- \u5b9a\u7fa9\u8655\u7406\u7a0b\u5e8f\n    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;\n    \n    -- \u6253\u958b\u6e38\u6a19\n    OPEN emp_cursor;\n    \n    -- \u5faa\u74b0\u904d\u6b77\n    read_loop: LOOP\n        FETCH emp_cursor INTO emp_name;\n        IF done THEN\n            LEAVE read_loop;\n        END IF;\n        -- \u6253\u5370\u54e1\u5de5\u59d3\u540d\n        SELECT emp_name;\n    END LOOP;\n    \n    -- \u95dc\u9589\u6e38\u6a19\n    CLOSE emp_cursor;\nEND \/\/\n\nDELIMITER ;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5b9a\u7fa9\u4e86\u4e00\u500b\u6e38\u6a19\u4f86\u9078\u64c7 <code>employees<\/code> \u8868\u4e2d\u7684\u6240\u6709\u54e1\u5de5\u59d3\u540d\u3002\u7136\u5f8c\uff0c\u6211\u5011\u4f7f\u7528\u4e00\u500b\u5faa\u74b0\u4f86\u9010\u884c\u63d0\u53d6\u6578\u64da\uff0c\u4e26\u5728\u6bcf\u6b21\u8fed\u4ee3\u4e2d\u6253\u5370\u51fa\u54e1\u5de5\u59d3\u540d\u3002\u6700\u5f8c\uff0c\u6211\u5011\u95dc\u9589\u6e38\u6a19\u4ee5\u91cb\u653e\u8cc7\u6e90\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-ogOUCKQNvg\">\u7d50\u8ad6<\/h2>\n<p>\u4f7f\u7528\u5b58\u5132\u904e\u7a0b\u904d\u6b77\u6578\u64da\u5eab\u8868\u7684\u6bcf\u4e00\u884c\u6578\u64da\u662f\u4e00\u7a2e\u9ad8\u6548\u4e14\u9748\u6d3b\u7684\u65b9\u6cd5\u3002\u901a\u904e\u6e38\u6a19\uff0c\u6211\u5011\u53ef\u4ee5\u9010\u884c\u8655\u7406\u6578\u64da\uff0c\u4e26\u6839\u64da\u9700\u8981\u57f7\u884c\u5404\u7a2e\u64cd\u4f5c\u3002\u9019\u7a2e\u65b9\u6cd5\u4e0d\u50c5\u63d0\u9ad8\u4e86\u6027\u80fd\uff0c\u9084\u589e\u5f37\u4e86\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u5b89\u5168\u6027\u548c\u53ef\u91cd\u7528\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684\u6578\u64da\u5eab\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528\u5b58\u5132\u904e\u7a0b\u904d\u6b77\u6578\u64da\u5eab\u8868\u7684\u6bcf\u4e00\u884c\u6578\u64da\uff0c\u5be6\u73fe\u9ad8\u6548\u6578\u64da\u8655\u7406\u548c\u64cd\u4f5c\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-179350","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179350","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=179350"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179350\/revisions"}],"predecessor-version":[{"id":179351,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179350\/revisions\/179351"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179350"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179350"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179350"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}