{"id":162957,"date":"2024-11-04T19:27:18","date_gmt":"2024-11-04T11:27:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162957\/"},"modified":"2024-11-04T19:27:19","modified_gmt":"2024-11-04T11:27:19","slug":"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8sql%e4%b8%ad%e7%9a%84%e5%87%bd%e6%95%b8%e6%9b%bf%e4%bb%a3%e6%b8%b8%e6%a8%99","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162957\/","title":{"rendered":"\u6559\u60a8\u5982\u4f55\u4f7f\u7528SQL\u4e2d\u7684\u51fd\u6578\u66ff\u4ee3\u6e38\u6a19"},"content":{"rendered":"<h1 id=\"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8sql%e4%b8%ad%e7%9a%84%e5%87%bd%e6%95%b8%e6%9b%bf%e4%bb%a3%e6%b8%b8%e6%a8%99-NNDGUhnyVM\">\u6559\u60a8\u5982\u4f55\u4f7f\u7528SQL\u4e2d\u7684\u51fd\u6578\u66ff\u4ee3\u6e38\u6a19<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0c\u6e38\u6a19\u662f\u4e00\u7a2e\u5e38\u7528\u7684\u5de5\u5177\uff0c\u7528\u65bc\u9010\u884c\u8655\u7406\u67e5\u8a62\u7d50\u679c\u3002\u7136\u800c\uff0c\u6e38\u6a19\u7684\u4f7f\u7528\u5f80\u5f80\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u70ba\u4e86\u63d0\u9ad8\u6548\u7387\uff0c\u8a31\u591a\u958b\u767c\u8005\u9078\u64c7\u4f7f\u7528SQL\u51fd\u6578\u4f86\u66ff\u4ee3\u6e38\u6a19\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728SQL\u4e2d\u4f7f\u7528\u51fd\u6578\u4f86\u9054\u5230\u76f8\u540c\u7684\u76ee\u7684\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\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-NNDGUhnyVM\">\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\u6aa2\u7d22\u67e5\u8a62\u7d50\u679c\u3002\u5b83\u901a\u5e38\u7528\u65bc\u9700\u8981\u9010\u884c\u8655\u7406\u6578\u64da\u7684\u60c5\u6cc1\uff0c\u4f8b\u5982\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\u9032\u884c\u8907\u96dc\u7684\u8a08\u7b97\u6216\u66f4\u65b0\u64cd\u4f5c\u3002\u96d6\u7136\u6e38\u6a19\u63d0\u4f9b\u4e86\u9748\u6d3b\u6027\uff0c\u4f46\u5b83\u5011\u7684\u6027\u80fd\u5f80\u5f80\u4e0d\u5982\u6279\u91cf\u64cd\u4f5c\uff0c\u56e0\u70ba\u6bcf\u6b21\u64cd\u4f5c\u90fd\u9700\u8981\u8207\u8cc7\u6599\u5eab\u9032\u884c\u4ea4\u4e92\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e8%a6%81%e4%bd%bf%e7%94%a8%e5%87%bd%e6%95%b8%e6%9b%bf%e4%bb%a3%e6%b8%b8%e6%a8%99%ef%bc%9f-NNDGUhnyVM\">\u70ba\u4ec0\u9ebc\u8981\u4f7f\u7528\u51fd\u6578\u66ff\u4ee3\u6e38\u6a19\uff1f<\/h2>\n<p>\u4f7f\u7528\u51fd\u6578\u66ff\u4ee3\u6e38\u6a19\u7684\u4e3b\u8981\u539f\u56e0\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u6027\u80fd\u63d0\u5347\uff1a<\/strong>\u51fd\u6578\u53ef\u4ee5\u5728\u8cc7\u6599\u5eab\u5167\u90e8\u9032\u884c\u6279\u91cf\u8655\u7406\uff0c\u6e1b\u5c11\u8207\u8cc7\u6599\u5eab\u7684\u4ea4\u4e92\u6b21\u6578\u3002<\/li>\n<li><strong>\u4ee3\u78bc\u7c21\u6f54\uff1a<\/strong>\u4f7f\u7528\u51fd\u6578\u53ef\u4ee5\u4f7fSQL\u4ee3\u78bc\u66f4\u7c21\u6f54\u6613\u8b80\uff0c\u6e1b\u5c11\u932f\u8aa4\u7684\u53ef\u80fd\u6027\u3002<\/li>\n<li><strong>\u53ef\u7dad\u8b77\u6027\uff1a<\/strong>\u51fd\u6578\u7684\u4f7f\u7528\u4f7f\u5f97\u4ee3\u78bc\u66f4\u5177\u6a21\u7d44\u5316\uff0c\u4fbf\u65bc\u5f8c\u671f\u7dad\u8b77\u548c\u4fee\u6539\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8sql%e5%87%bd%e6%95%b8%e6%9b%bf%e4%bb%a3%e6%b8%b8%e6%a8%99-NNDGUhnyVM\">\u5982\u4f55\u4f7f\u7528SQL\u51fd\u6578\u66ff\u4ee3\u6e38\u6a19<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u60c5\u5883\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528SQL\u51fd\u6578\u4f86\u66ff\u4ee3\u6e38\u6a19\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b%e4%b8%80%ef%bc%9a%e8%a8%88%e7%ae%97%e7%b8%bd%e5%92%8c-NNDGUhnyVM\">\u7bc4\u4f8b\u4e00\uff1a\u8a08\u7b97\u7e3d\u548c<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>sales<\/code> \u7684\u8868\u683c\uff0c\u5305\u542b <code>amount<\/code> \u6b04\u4f4d\uff0c\u6211\u5011\u5e0c\u671b\u8a08\u7b97\u6240\u6709\u92b7\u552e\u7684\u7e3d\u548c\u3002\u4f7f\u7528\u6e38\u6a19\u7684\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nDECLARE total_sum INT DEFAULT 0;\nDECLARE done INT DEFAULT FALSE;\nDECLARE cur CURSOR FOR SELECT amount FROM sales;\nDECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;\n\nOPEN cur;\nREPEAT\n    FETCH cur INTO @amount;\n    IF NOT done THEN\n        SET total_sum = total_sum + @amount;\n    END IF;\nUNTIL done END REPEAT;\nCLOSE cur;\nSELECT total_sum;\n<\/code><\/pre>\n<p>\u4f7f\u7528\u51fd\u6578\u4f86\u5be6\u73fe\u76f8\u540c\u7684\u529f\u80fd\uff0c\u4ee3\u78bc\u5c07\u8b8a\u5f97\u7c21\u6f54\u8a31\u591a\uff1a<\/p>\n<pre><code>\nSELECT SUM(amount) AS total_sum FROM sales;\n<\/code><\/pre>\n<h3 id=\"%e7%af%84%e4%be%8b%e4%ba%8c%ef%bc%9a%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a-NNDGUhnyVM\">\u7bc4\u4f8b\u4e8c\uff1a\u66f4\u65b0\u6578\u64da<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u9700\u8981\u5c07 <code>products<\/code> \u8868\u4e2d\u7684\u6240\u6709\u50f9\u683c\u63d0\u9ad810%\u3002\u4f7f\u7528\u6e38\u6a19\u7684\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nDECLARE done INT DEFAULT FALSE;\nDECLARE cur CURSOR FOR SELECT id FROM products;\nDECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;\n\nOPEN cur;\nREPEAT\n    FETCH cur INTO @id;\n    IF NOT done THEN\n        UPDATE products SET price = price * 1.1 WHERE id = @id;\n    END IF;\nUNTIL done END REPEAT;\nCLOSE cur;\n<\/code><\/pre>\n<p>\u800c\u4f7f\u7528\u51fd\u6578\u4f86\u66f4\u65b0\u6578\u64da\uff0c\u5247\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>\nUPDATE products SET price = price * 1.1;\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-NNDGUhnyVM\">\u7d50\u8ad6<\/h2>\n<p>\u5728SQL\u4e2d\uff0c\u4f7f\u7528\u51fd\u6578\u66ff\u4ee3\u6e38\u6a19\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6027\u80fd\uff0c\u9084\u80fd\u4f7f\u4ee3\u78bc\u66f4\u7c21\u6f54\u548c\u6613\u65bc\u7dad\u8b77\u3002\u900f\u904e\u4e0a\u8ff0\u7bc4\u4f8b\uff0c\u6211\u5011\u53ef\u4ee5\u770b\u5230\u5982\u4f55\u6709\u6548\u5730\u4f7f\u7528SQL\u51fd\u6578\u4f86\u9054\u6210\u8207\u6e38\u6a19\u76f8\u540c\u7684\u76ee\u7684\u3002\u96a8\u8457\u8cc7\u6599\u5eab\u6280\u8853\u7684\u767c\u5c55\uff0c\u638c\u63e1\u9019\u4e9b\u6280\u5de7\u5c07\u6709\u52a9\u65bc\u958b\u767c\u8005\u5728\u65e5\u5e38\u5de5\u4f5c\u4e2d\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u53ca\u5176\u76f8\u95dc\u670d\u52d9\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728SQL\u4e2d\u4f7f\u7528\u51fd\u6578\u66ff\u4ee3\u6e38\u6a19\uff0c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u7c21\u5316\u4ee3\u78bc\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6027\u80fd\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-162957","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162957","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=162957"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162957\/revisions"}],"predecessor-version":[{"id":162958,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162957\/revisions\/162958"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162957"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162957"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162957"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}