{"id":79052,"date":"2024-10-16T12:38:14","date_gmt":"2024-10-16T04:38:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79052\/"},"modified":"2024-10-16T12:38:14","modified_gmt":"2024-10-16T04:38:14","slug":"mysql%e6%8c%87%e4%bb%a4-loop%ef%bc%88%e5%be%aa%e7%92%b0%e8%aa%9e%e5%8f%a5%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79052\/","title":{"rendered":"MySQL\u6307\u4ee4: LOOP\uff08\u5faa\u74b0\u8a9e\u53e5\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-loop%ef%bc%88%e5%be%aa%e7%92%b0%e8%aa%9e%e5%8f%a5%ef%bc%89-QBrWCkXQNd\">MySQL\u6307\u4ee4: LOOP\uff08\u5faa\u74b0\u8a9e\u53e5\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u958b\u6e90\u95dc\u806f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u8655\u7406\u8cc7\u6599\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u5faa\u74b0\u8a9e\u53e5\uff08LOOP\uff09\u3002\u5faa\u74b0\u8a9e\u53e5\u5141\u8a31\u958b\u767c\u8005\u5728\u7279\u5b9a\u689d\u4ef6\u4e0b\u91cd\u8907\u57f7\u884c\u4e00\u6bb5\u7a0b\u5f0f\u78bc\uff0c\u9019\u5728\u8655\u7406\u5927\u91cf\u8cc7\u6599\u6216\u9700\u8981\u91cd\u8907\u8a08\u7b97\u7684\u60c5\u6cc1\u4e0b\u7279\u5225\u6709\u7528\u3002<\/p>\n<h2 id=\"loop%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e7%b5%90%e6%a7%8b-QBrWCkXQNd\">LOOP\u8a9e\u53e5\u7684\u57fa\u672c\u7d50\u69cb<\/h2>\n<p>LOOP\u8a9e\u53e5\u7684\u57fa\u672c\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nLOOP\n    -- \u57f7\u884c\u7684\u7a0b\u5f0f\u78bc\nEND LOOP;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7d50\u69cb\u4e2d\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728LOOP\u548cEND LOOP\u4e4b\u9593\u653e\u7f6e\u4efb\u4f55\u9700\u8981\u91cd\u8907\u57f7\u884c\u7684SQL\u8a9e\u53e5\u3002\u9019\u4e9b\u8a9e\u53e5\u5c07\u6839\u64da\u689d\u4ef6\u4e0d\u65b7\u57f7\u884c\uff0c\u76f4\u5230\u6eff\u8db3\u9000\u51fa\u689d\u4ef6\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8loop%e7%9a%84%e7%af%84%e4%be%8b-QBrWCkXQNd\">\u4f7f\u7528LOOP\u7684\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528LOOP\u7684\u7c21\u55ae\u7bc4\u4f8b\uff0c\u8a72\u7bc4\u4f8b\u5c07\u5f9e1\u52a0\u523010\u4e26\u8f38\u51fa\u7d50\u679c\uff1a<\/p>\n<pre><code>\nDELIMITER \/\/\nCREATE PROCEDURE sum_numbers()\nBEGIN\n    DECLARE total INT DEFAULT 0;\n    DECLARE counter INT DEFAULT 1;\n\n    LOOP\n        SET total = total + counter;\n        SET counter = counter + 1;\n\n        IF counter &gt; 10 THEN\n            LEAVE; -- \u9000\u51fa\u5faa\u74b0\n        END IF;\n    END LOOP;\n\n    SELECT total AS '\u7e3d\u548c';\nEND \/\/\nDELIMITER ;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70basum_numbers\u7684\u5b58\u5132\u904e\u7a0b\u3002\u5b83\u4f7f\u7528LOOP\u4f86\u8a08\u7b97\u5f9e1\u523010\u7684\u7e3d\u548c\u3002\u7576\u8a08\u6578\u5668\u8d85\u904e10\u6642\uff0c\u4f7f\u7528LEAVE\u8a9e\u53e5\u9000\u51fa\u5faa\u74b0\u3002<\/p>\n<h2 id=\"loop%e7%9a%84%e5%84%aa%e7%bc%ba%e9%bb%9e-QBrWCkXQNd\">LOOP\u7684\u512a\u7f3a\u9ede<\/h2>\n<h3 id=\"%e5%84%aa%e9%bb%9e-QBrWCkXQNd\">\u512a\u9ede<\/h3>\n<ul>\n<li><strong>\u7c21\u55ae\u6613\u7528\uff1a<\/strong>LOOP\u8a9e\u53e5\u7684\u8a9e\u6cd5\u7c21\u55ae\uff0c\u6613\u65bc\u7406\u89e3\u548c\u4f7f\u7528\u3002<\/li>\n<li><strong>\u9748\u6d3b\u6027\uff1a<\/strong>\u53ef\u4ee5\u5728\u5faa\u74b0\u4e2d\u57f7\u884c\u591a\u7a2eSQL\u64cd\u4f5c\uff0c\u9069\u7528\u65bc\u591a\u7a2e\u60c5\u6cc1\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%bc%ba%e9%bb%9e-QBrWCkXQNd\">\u7f3a\u9ede<\/h3>\n<ul>\n<li><strong>\u6027\u80fd\u554f\u984c\uff1a<\/strong>\u5982\u679c\u5faa\u74b0\u6b21\u6578\u904e\u591a\uff0c\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u8cc7\u6599\u6642\u3002<\/li>\n<li><strong>\u7121\u6cd5\u81ea\u52d5\u9000\u51fa\uff1a<\/strong>\u5982\u679c\u6c92\u6709\u6b63\u78ba\u8a2d\u7f6e\u9000\u51fa\u689d\u4ef6\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u7121\u9650\u5faa\u74b0\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-QBrWCkXQNd\">\u7d50\u8ad6<\/h2>\n<p>LOOP\u8a9e\u53e5\u5728MySQL\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5728\u9700\u8981\u91cd\u8907\u57f7\u884c\u67d0\u4e9b\u64cd\u4f5c\u6642\u63d0\u9ad8\u6548\u7387\u3002\u7136\u800c\uff0c\u4f7f\u7528\u6642\u9700\u8b39\u614e\u8a2d\u7f6e\u9000\u51fa\u689d\u4ef6\uff0c\u4ee5\u907f\u514d\u6027\u80fd\u554f\u984c\u6216\u7121\u9650\u5faa\u74b0\u7684\u60c5\u6cc1\u767c\u751f\u3002\u900f\u904e\u9069\u7576\u7684\u4f7f\u7528\uff0cLOOP\u53ef\u4ee5\u6210\u70ba\u8cc7\u6599\u5eab\u64cd\u4f5c\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u7d44\u4ef6\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3MySQL\u53ca\u5176\u76f8\u95dc\u6280\u8853\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u9032\u884c\u5be6\u9a57\u548c\u958b\u767c\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u5b78\u7fd2\u548c\u9805\u76ee\u63d0\u4f9b\u7a69\u5b9a\u7684\u74b0\u5883\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684LOOP\u5faa\u74b0\u8a9e\u53e5\uff0c\u5b78\u7fd2\u5982\u4f55\u5728\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u5be6\u73fe\u91cd\u8907\u57f7\u884c\u7684\u908f\u8f2f\uff0c\u63d0\u5347\u67e5\u8a62\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-79052","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79052","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=79052"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79052\/revisions"}],"predecessor-version":[{"id":79053,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79052\/revisions\/79053"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79052"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79052"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79052"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}