{"id":78562,"date":"2024-10-16T12:04:15","date_gmt":"2024-10-16T04:04:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78562\/"},"modified":"2024-10-16T12:04:15","modified_gmt":"2024-10-16T04:04:15","slug":"mysql%e6%8c%87%e4%bb%a4-function%ef%bc%88%e5%87%bd%e6%95%b8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78562\/","title":{"rendered":"MySQL\u6307\u4ee4: FUNCTION\uff08\u51fd\u6578\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-function%ef%bc%88%e5%87%bd%e6%95%b8%ef%bc%89-ufZwhHwjXw\">MySQL\u6307\u4ee4: FUNCTION\uff08\u51fd\u6578\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\u548c\u7ba1\u7406\u8cc7\u6599\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u81ea\u5b9a\u7fa9\u51fd\u6578\uff08FUNCTION\uff09\u3002\u81ea\u5b9a\u7fa9\u51fd\u6578\u5141\u8a31\u7528\u6236\u6839\u64da\u7279\u5b9a\u9700\u6c42\u5275\u5efa\u81ea\u5df1\u7684\u908f\u8f2f\uff0c\u5f9e\u800c\u63d0\u9ad8\u8cc7\u6599\u8655\u7406\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%ef%bc%9f-ufZwhHwjXw\">\u4ec0\u9ebc\u662f\u81ea\u5b9a\u7fa9\u51fd\u6578\uff1f<\/h2>\n<p>\u81ea\u5b9a\u7fa9\u51fd\u6578\u662f\u7528\u6236\u5b9a\u7fa9\u7684\u7a0b\u5f0f\u78bc\u584a\uff0c\u53ef\u4ee5\u5728SQL\u67e5\u8a62\u4e2d\u88ab\u91cd\u8907\u4f7f\u7528\u3002\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u63a5\u53d7\u53c3\u6578\u4e26\u8fd4\u56de\u4e00\u500b\u503c\uff0c\u901a\u5e38\u7528\u65bc\u57f7\u884c\u8a08\u7b97\u6216\u8655\u7406\u8cc7\u6599\u3002\u8207\u5b58\u5132\u904e\u7a0b\u4e0d\u540c\uff0c\u81ea\u5b9a\u7fa9\u51fd\u6578\u5fc5\u9808\u8fd4\u56de\u4e00\u500b\u503c\uff0c\u4e26\u4e14\u53ef\u4ee5\u5728SELECT\u8a9e\u53e5\u4e2d\u4f7f\u7528\u3002<\/p>\n<h2 id=\"%e5%89%b5%e5%bb%ba%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%e7%9a%84%e8%aa%9e%e6%b3%95-ufZwhHwjXw\">\u5275\u5efa\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u8a9e\u6cd5<\/h2>\n<p>\u5275\u5efa\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE FUNCTION \u51fd\u6578\u540d\u7a31 (\u53c3\u6578\u985e\u578b)\nRETURNS \u8fd4\u56de\u985e\u578b\nBEGIN\n    -- \u51fd\u6578\u908f\u8f2f\n    RETURN \u8fd4\u56de\u503c;\nEND;<\/code><\/pre>\n<h3 id=\"%e7%af%84%e4%be%8b%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8b%e7%b0%a1%e5%96%ae%e7%9a%84%e5%8a%a0%e6%b3%95%e5%87%bd%e6%95%b8-ufZwhHwjXw\">\u7bc4\u4f8b\uff1a\u5275\u5efa\u4e00\u500b\u7c21\u55ae\u7684\u52a0\u6cd5\u51fd\u6578<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5275\u5efa\u4e00\u500b\u52a0\u6cd5\u51fd\u6578\uff1a<\/p>\n<pre><code>CREATE FUNCTION add_numbers (a INT, b INT)\nRETURNS INT\nBEGIN\n    RETURN a + b;\nEND;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>add_numbers<\/code> \u7684\u51fd\u6578\uff0c\u5b83\u63a5\u53d7\u5169\u500b\u6574\u6578\u53c3\u6578\uff0c\u4e26\u8fd4\u56de\u5b83\u5011\u7684\u548c\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8-ufZwhHwjXw\">\u4f7f\u7528\u81ea\u5b9a\u7fa9\u51fd\u6578<\/h2>\n<p>\u4e00\u65e6\u51fd\u6578\u88ab\u5275\u5efa\uff0c\u5c31\u53ef\u4ee5\u5728SQL\u67e5\u8a62\u4e2d\u4f7f\u7528\u5b83\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT add_numbers(5, 10) AS result;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>result<\/code> \u70ba 15\u3002<\/p>\n<h2 id=\"%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%e7%9a%84%e5%84%aa%e5%8b%a2-ufZwhHwjXw\">\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u512a\u52e2<\/h2>\n<ul>\n<li><strong>\u91cd\u7528\u6027\uff1a<\/strong>\u81ea\u5b9a\u7fa9\u51fd\u6578\u53ef\u4ee5\u5728\u591a\u500b\u67e5\u8a62\u4e2d\u91cd\u8907\u4f7f\u7528\uff0c\u6e1b\u5c11\u4e86\u91cd\u8907\u4ee3\u78bc\u7684\u9700\u8981\u3002<\/li>\n<li><strong>\u53ef\u8b80\u6027\uff1a<\/strong>\u901a\u904e\u5c07\u8907\u96dc\u7684\u908f\u8f2f\u5c01\u88dd\u5728\u51fd\u6578\u4e2d\uff0c\u53ef\u4ee5\u63d0\u9ad8SQL\u67e5\u8a62\u7684\u53ef\u8b80\u6027\u3002<\/li>\n<li><strong>\u6027\u80fd\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u81ea\u5b9a\u7fa9\u51fd\u6578\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u56e0\u70ba\u5b83\u5011\u53ef\u4ee5\u5728\u4f3a\u670d\u5668\u7aef\u57f7\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-ufZwhHwjXw\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528\u81ea\u5b9a\u7fa9\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u51fd\u6578\u7684\u540d\u7a31\u5fc5\u9808\u662f\u552f\u4e00\u7684\uff0c\u4e0d\u80fd\u8207\u73fe\u6709\u7684\u51fd\u6578\u6216\u7cfb\u7d71\u4fdd\u7559\u5b57\u885d\u7a81\u3002<\/li>\n<li>\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u8cc7\u6599\u6642\u3002<\/li>\n<li>\u5728\u5275\u5efa\u6216\u4fee\u6539\u51fd\u6578\u6642\uff0c\u5fc5\u9808\u64c1\u6709\u76f8\u61c9\u7684\u6b0a\u9650\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ufZwhHwjXw\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684\u81ea\u5b9a\u7fa9\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u6839\u64da\u7279\u5b9a\u9700\u6c42\u5275\u5efa\u9748\u6d3b\u7684\u8cc7\u6599\u8655\u7406\u908f\u8f2f\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u81ea\u5b9a\u7fa9\u51fd\u6578\uff0c\u53ef\u4ee5\u63d0\u9ad8\u8cc7\u6599\u5eab\u64cd\u4f5c\u7684\u6548\u7387\u548c\u53ef\u8b80\u6027\u3002\u82e5\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\">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\u4e2d\u7684FUNCTION\uff08\u51fd\u6578\uff09\u6307\u4ee4\uff0c\u5b78\u7fd2\u5982\u4f55\u5275\u5efa\u548c\u4f7f\u7528\u81ea\u5b9a\u7fa9\u51fd\u6578\u4ee5\u589e\u5f37\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u9748\u6d3b\u6027\u548c\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-78562","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78562","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=78562"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78562\/revisions"}],"predecessor-version":[{"id":78563,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78562\/revisions\/78563"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78562"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78562"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78562"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}