{"id":79558,"date":"2024-10-16T13:17:16","date_gmt":"2024-10-16T05:17:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79558\/"},"modified":"2024-10-16T13:17:16","modified_gmt":"2024-10-16T05:17:16","slug":"mysql%e6%8c%87%e4%bb%a4-return%ef%bc%88%e8%bf%94%e5%9b%9e%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79558\/","title":{"rendered":"MySQL\u6307\u4ee4: RETURN\uff08\u8fd4\u56de\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-return%ef%bc%88%e8%bf%94%e5%9b%9e%ef%bc%89-HfeCTFVSyu\">MySQL\u6307\u4ee4: RETURN\uff08\u8fd4\u56de\uff09<\/h1>\n<p>\u5728MySQL\u4e2d\uff0cRETURN\u6307\u4ee4\u4e26\u4e0d\u662f\u4e00\u500b\u7368\u7acb\u7684SQL\u8a9e\u53e5\uff0c\u800c\u662f\u7528\u65bc\u5b58\u5132\u904e\u7a0b\u548c\u51fd\u6578\u4e2d\u7684\u4e00\u500b\u95dc\u9375\u5b57\u3002\u5b83\u7684\u4e3b\u8981\u529f\u80fd\u662f\u7d50\u675f\u5b58\u5132\u904e\u7a0b\u6216\u51fd\u6578\u7684\u57f7\u884c\uff0c\u4e26\u8fd4\u56de\u4e00\u500b\u503c\u7d66\u8abf\u7528\u8005\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0eRETURN\u6307\u4ee4\u7684\u7528\u6cd5\u3001\u7bc4\u4f8b\u4ee5\u53ca\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"return%e6%8c%87%e4%bb%a4%e7%9a%84%e5%9f%ba%e6%9c%ac%e7%94%a8%e6%b3%95-HfeCTFVSyu\">RETURN\u6307\u4ee4\u7684\u57fa\u672c\u7528\u6cd5<\/h2>\n<p>\u5728MySQL\u4e2d\uff0cRETURN\u6307\u4ee4\u901a\u5e38\u7528\u65bc\u4ee5\u4e0b\u5169\u7a2e\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\u7d50\u675f\u57f7\u884c\u4e26\u8fd4\u56de\u72c0\u614b\u78bc\u3002<\/li>\n<li>\u5728\u51fd\u6578\u4e2d\u8fd4\u56de\u8a08\u7b97\u7d50\u679c\u6216\u67e5\u8a62\u7d50\u679c\u3002<\/li>\n<\/ul>\n<h3 id=\"%e5%9c%a8%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e4%b8%ad%e7%9a%84%e4%bd%bf%e7%94%a8-HfeCTFVSyu\">\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\u7684\u4f7f\u7528<\/h3>\n<p>\u7576\u4f60\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\u4f7f\u7528RETURN\u6307\u4ee4\u6642\uff0c\u53ef\u4ee5\u8fd4\u56de\u4e00\u500b\u6574\u6578\u503c\uff0c\u9019\u500b\u503c\u901a\u5e38\u7528\u4f86\u8868\u793a\u57f7\u884c\u7684\u72c0\u614b\u3002\u4f8b\u5982\uff0c0\u8868\u793a\u6210\u529f\uff0c1\u8868\u793a\u5931\u6557\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DELIMITER \/\/\nCREATE PROCEDURE example_procedure()\nBEGIN\n    DECLARE exit_code INT DEFAULT 0;\n\n    -- \u57f7\u884c\u4e00\u4e9b\u64cd\u4f5c\n    IF (some_condition) THEN\n        SET exit_code = 1; -- \u8a2d\u7f6e\u932f\u8aa4\u4ee3\u78bc\n    END IF;\n\n    RETURN exit_code; -- \u8fd4\u56de\u72c0\u614b\u78bc\nEND \/\/\nDELIMITER ;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u5b58\u5132\u904e\u7a0b\u6703\u6839\u64da\u67d0\u500b\u689d\u4ef6\u8fd4\u56de\u4e0d\u540c\u7684\u72c0\u614b\u78bc\u3002\u8abf\u7528\u9019\u500b\u5b58\u5132\u904e\u7a0b\u5f8c\uff0c\u53ef\u4ee5\u6839\u64da\u8fd4\u56de\u7684\u72c0\u614b\u78bc\u4f86\u5224\u65b7\u64cd\u4f5c\u662f\u5426\u6210\u529f\u3002<\/p>\n<h3 id=\"%e5%9c%a8%e5%87%bd%e6%95%b8%e4%b8%ad%e7%9a%84%e4%bd%bf%e7%94%a8-HfeCTFVSyu\">\u5728\u51fd\u6578\u4e2d\u7684\u4f7f\u7528<\/h3>\n<p>\u5728MySQL\u51fd\u6578\u4e2d\uff0cRETURN\u6307\u4ee4\u7528\u4f86\u8fd4\u56de\u8a08\u7b97\u7d50\u679c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u51fd\u6578\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DELIMITER \/\/\nCREATE FUNCTION add_numbers(a INT, b INT) RETURNS INT\nBEGIN\n    RETURN a + b; -- \u8fd4\u56de\u5169\u500b\u6578\u5b57\u7684\u548c\nEND \/\/\nDELIMITER ;<\/code><\/pre>\n<p>\u9019\u500b\u51fd\u6578\u63a5\u53d7\u5169\u500b\u6574\u6578\u4f5c\u70ba\u53c3\u6578\uff0c\u4e26\u8fd4\u56de\u5b83\u5011\u7684\u548c\u3002\u8abf\u7528\u9019\u500b\u51fd\u6578\u6642\uff0c\u53ef\u4ee5\u76f4\u63a5\u7372\u5f97\u8a08\u7b97\u7d50\u679c\uff1a<\/p>\n<pre><code>SELECT add_numbers(5, 10); -- \u8fd4\u56de 15<\/code><\/pre>\n<h2 id=\"return%e6%8c%87%e4%bb%a4%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-HfeCTFVSyu\">RETURN\u6307\u4ee4\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528RETURN\u6307\u4ee4\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\uff0cRETURN\u6307\u4ee4\u53ea\u80fd\u8fd4\u56de\u6574\u6578\u503c\uff0c\u800c\u5728\u51fd\u6578\u4e2d\u5247\u53ef\u4ee5\u8fd4\u56de\u4efb\u4f55\u6578\u64da\u985e\u578b\u3002<\/li>\n<li>RETURN\u6307\u4ee4\u5fc5\u9808\u5728\u5b58\u5132\u904e\u7a0b\u6216\u51fd\u6578\u7684\u6700\u5f8c\u57f7\u884c\uff0c\u5426\u5247\u5c07\u5c0e\u81f4\u8a9e\u6cd5\u932f\u8aa4\u3002<\/li>\n<li>\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\uff0cRETURN\u6307\u4ee4\u4e0d\u6703\u5f71\u97ff\u5176\u4ed6\u8a9e\u53e5\u7684\u57f7\u884c\uff0c\u50c5\u50c5\u662f\u7d50\u675f\u904e\u7a0b\u7684\u57f7\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e4%b8%ad%e7%9a%84%e9%87%8d%e8%a6%81%e6%80%a7-HfeCTFVSyu\">\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u91cd\u8981\u6027<\/h2>\n<p>RETURN\u6307\u4ee4\u5728MySQL\u7684\u5b58\u5132\u904e\u7a0b\u548c\u51fd\u6578\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u89d2\u8272\u3002\u5b83\u4e0d\u50c5\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u63a7\u5236\u7a0b\u5e8f\u7684\u57f7\u884c\u6d41\u7a0b\uff0c\u9084\u80fd\u5920\u63d0\u4f9b\u6e05\u6670\u7684\u72c0\u614b\u56de\u994b\u3002\u9019\u5c0d\u65bc\u8abf\u8a66\u548c\u7dad\u8b77\u6578\u64da\u5eab\u61c9\u7528\u7a0b\u5e8f\u4f86\u8aaa\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u5927\u578b\u7684\u6578\u64da\u8655\u7406\u7cfb\u7d71\u4e2d\uff0c\u4f7f\u7528RETURN\u6307\u4ee4\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5feb\u901f\u5b9a\u4f4d\u554f\u984c\uff0c\u56e0\u70ba\u6bcf\u500b\u5b58\u5132\u904e\u7a0b\u6216\u51fd\u6578\u90fd\u80fd\u5920\u8fd4\u56de\u5177\u9ad4\u7684\u932f\u8aa4\u4ee3\u78bc\uff0c\u5f9e\u800c\u4f7f\u5f97\u932f\u8aa4\u8655\u7406\u8b8a\u5f97\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-HfeCTFVSyu\">\u7e3d\u7d50<\/h2>\n<p>RETURN\u6307\u4ee4\u5728MySQL\u4e2d\u662f\u4e00\u500b\u95dc\u9375\u7684\u529f\u80fd\uff0c\u7121\u8ad6\u662f\u5728\u5b58\u5132\u904e\u7a0b\u9084\u662f\u51fd\u6578\u4e2d\uff0c\u90fd\u80fd\u5920\u6709\u6548\u5730\u63a7\u5236\u57f7\u884c\u6d41\u7a0b\u4e26\u8fd4\u56de\u7d50\u679c\u3002\u4e86\u89e3\u5982\u4f55\u6b63\u78ba\u4f7f\u7528RETURN\u6307\u4ee4\uff0c\u5c07\u6709\u52a9\u65bc\u958b\u767c\u8005\u7de8\u5beb\u51fa\u66f4\u9ad8\u6548\u3001\u66f4\u6613\u65bc\u7dad\u8b77\u7684\u6578\u64da\u5eab\u61c9\u7528\u7a0b\u5e8f\u3002\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\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\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u70ba\u60a8\u7684\u9805\u76ee\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4RETURN\uff08\u8fd4\u56de\uff09\u7684\u7528\u6cd5\uff0c\u638c\u63e1\u5982\u4f55\u5728\u67e5\u8be2\u4e2d\u6709\u6548\u8fd4\u56de\u6570\u636e\uff0c\u63d0\u5347\u6570\u636e\u5e93\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-79558","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79558","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=79558"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79558\/revisions"}],"predecessor-version":[{"id":79559,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79558\/revisions\/79559"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79558"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79558"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79558"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}