{"id":75848,"date":"2024-10-16T01:44:18","date_gmt":"2024-10-15T17:44:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/75848\/"},"modified":"2024-10-16T01:44:18","modified_gmt":"2024-10-15T17:44:18","slug":"mysql-%e5%89%b5%e5%bb%ba%e5%87%bd%e6%95%b8%e5%95%8f%e9%a1%8c%e7%9a%84%e8%99%95%e7%90%86%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/75848\/","title":{"rendered":"MySQL \u5275\u5efa\u51fd\u6578\u554f\u984c\u7684\u8655\u7406\u65b9\u6cd5"},"content":{"rendered":"

MySQL \u5275\u5efa\u51fd\u6578\u554f\u984c\u7684\u8655\u7406\u65b9\u6cd5<\/h1>\n

\u5728\u4f7f\u7528 MySQL \u6578\u64da\u5eab\u6642\uff0c\u5275\u5efa\u81ea\u5b9a\u7fa9\u51fd\u6578\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u7c21\u5316\u4ee3\u78bc\uff0c\u63d0\u9ad8\u91cd\u7528\u6027\u3002\u7136\u800c\uff0c\u5728\u5275\u5efa\u548c\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\u7684\u904e\u7a0b\u4e2d\uff0c\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u554f\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u5e38\u898b\u7684 MySQL \u5275\u5efa\u51fd\u6578\u554f\u984c\u53ca\u5176\u89e3\u6c7a\u65b9\u6cd5\u3002<\/p>\n

1. \u51fd\u6578\u8a9e\u6cd5\u932f\u8aa4<\/h2>\n

\u5728\u5275\u5efa\u51fd\u6578\u6642\uff0c\u6700\u5e38\u898b\u7684\u554f\u984c\u4e4b\u4e00\u662f\u8a9e\u6cd5\u932f\u8aa4\u3002MySQL \u5c0d\u65bc\u51fd\u6578\u7684\u8a9e\u6cd5\u8981\u6c42\u975e\u5e38\u56b4\u683c\uff0c\u4efb\u4f55\u5c0f\u7684\u932f\u8aa4\u90fd\u53ef\u80fd\u5c0e\u81f4\u51fd\u6578\u7121\u6cd5\u5275\u5efa\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u6b63\u78ba\u7684\u51fd\u6578\u5275\u5efa\u793a\u4f8b\uff1a<\/p>\n

DELIMITER \/\/\nCREATE FUNCTION calculate_discount(price DECIMAL(10,2), discount_rate DECIMAL(5,2))\nRETURNS DECIMAL(10,2)\nBEGIN\n    RETURN price - (price * discount_rate \/ 100);\nEND \/\/\nDELIMITER ;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86 DELIMITER<\/code> \u4f86\u6539\u8b8a\u8a9e\u53e5\u7684\u7d50\u675f\u7b26\u865f\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u5728\u51fd\u6578\u5167\u90e8\u51fa\u73fe\u7684\u5206\u865f\u5c0e\u81f4\u8a9e\u6cd5\u932f\u8aa4\u3002<\/p>\n
2. \u6b0a\u9650\u554f\u984c<\/h2>\n
\u53e6\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\u662f\u6b0a\u9650\u4e0d\u8db3\u3002\u5275\u5efa\u51fd\u6578\u9700\u8981\u7279\u5b9a\u7684\u6b0a\u9650\uff0c\u5982\u679c\u7528\u6236\u6c92\u6709\u9019\u4e9b\u6b0a\u9650\uff0c\u5247\u6703\u51fa\u73fe\u932f\u8aa4\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u4f86\u6aa2\u67e5\u7528\u6236\u7684\u6b0a\u9650\uff1a<\/p>\n
SHOW GRANTS FOR 'username'@'host';<\/code><\/pre>\n
\u5982\u679c\u767c\u73fe\u6b0a\u9650\u4e0d\u8db3\uff0c\u53ef\u4ee5\u8acb\u6c42\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u6388\u4e88\u76f8\u61c9\u7684\u6b0a\u9650\uff0c\u4f8b\u5982\uff1a<\/p>\n
GRANT CREATE ROUTINE ON database_name.* TO 'username'@'host';<\/code><\/pre>\n
3. \u51fd\u6578\u8fd4\u56de\u985e\u578b\u4e0d\u5339\u914d<\/h2>\n
\u5728\u5275\u5efa\u51fd\u6578\u6642\uff0c\u8fd4\u56de\u985e\u578b\u5fc5\u9808\u8207\u5be6\u969b\u8fd4\u56de\u7684\u6578\u64da\u985e\u578b\u76f8\u7b26\u3002\u5982\u679c\u4e0d\u5339\u914d\uff0c\u5c07\u6703\u5c0e\u81f4\u932f\u8aa4\u3002\u4f8b\u5982\uff0c\u5982\u679c\u51fd\u6578\u8072\u660e\u8fd4\u56de DECIMAL<\/code> \u985e\u578b\uff0c\u4f46\u5be6\u969b\u8fd4\u56de\u7684\u662f VARCHAR<\/code> \u985e\u578b\uff0c\u5247\u6703\u51fa\u73fe\u932f\u8aa4\u3002\u78ba\u4fdd\u5728\u51fd\u6578\u5167\u90e8\u7684\u8a08\u7b97\u6216\u64cd\u4f5c\u8fd4\u56de\u7684\u6578\u64da\u985e\u578b\u8207\u8072\u660e\u7684\u8fd4\u56de\u985e\u578b\u4e00\u81f4\u3002<\/p>\n
4. \u51fd\u6578\u8abf\u7528\u932f\u8aa4<\/h2>\n
\u5728\u8abf\u7528\u51fd\u6578\u6642\uff0c\u50b3\u905e\u7684\u53c3\u6578\u985e\u578b\u548c\u6578\u91cf\u5fc5\u9808\u6b63\u78ba\u3002\u5982\u679c\u51fd\u6578\u671f\u671b\u5169\u500b\u53c3\u6578\uff0c\u4f46\u53ea\u50b3\u905e\u4e86\u4e00\u500b\uff0c\u5247\u6703\u5c0e\u81f4\u932f\u8aa4\u3002\u4ee5\u4e0b\u662f\u6b63\u78ba\u8abf\u7528\u51fd\u6578\u7684\u793a\u4f8b\uff1a<\/p>\n
SELECT calculate_discount(100.00, 10.00);<\/code><\/pre>\n
\u78ba\u4fdd\u5728\u8abf\u7528\u51fd\u6578\u6642\uff0c\u53c3\u6578\u7684\u985e\u578b\u548c\u9806\u5e8f\u8207\u51fd\u6578\u5b9a\u7fa9\u4e00\u81f4\u3002<\/p>\n
5. \u8abf\u8a66\u51fd\u6578\u554f\u984c<\/h2>\n
\u5982\u679c\u51fd\u6578\u5728\u57f7\u884c\u6642\u51fa\u73fe\u554f\u984c\uff0c\u53ef\u4ee5\u4f7f\u7528 SELECT<\/code> \u8a9e\u53e5\u4f86\u8abf\u8a66\u3002\u53ef\u4ee5\u5728\u51fd\u6578\u5167\u90e8\u6dfb\u52a0 SELECT<\/code> \u8a9e\u53e5\u4f86\u6aa2\u67e5\u8b8a\u91cf\u7684\u503c\uff0c\u9019\u6a23\u53ef\u4ee5\u5e6b\u52a9\u5b9a\u4f4d\u554f\u984c\u3002\u4f8b\u5982\uff1a<\/p>\n
BEGIN\n    SELECT price, discount_rate; -- \u7528\u65bc\u8abf\u8a66\n    RETURN price - (price * discount_rate \/ 100);\nEND;<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u5728 MySQL \u4e2d\u5275\u5efa\u548c\u4f7f\u7528\u81ea\u5b9a\u7fa9\u51fd\u6578\u6642\uff0c\u53ef\u80fd\u6703\u9047\u5230\u8a9e\u6cd5\u932f\u8aa4\u3001\u6b0a\u9650\u554f\u984c\u3001\u8fd4\u56de\u985e\u578b\u4e0d\u5339\u914d\u4ee5\u53ca\u8abf\u7528\u932f\u8aa4\u7b49\u554f\u984c\u3002\u901a\u904e\u4ed4\u7d30\u6aa2\u67e5\u8a9e\u6cd5\u3001\u78ba\u4fdd\u64c1\u6709\u8db3\u5920\u7684\u6b0a\u9650\u3001\u78ba\u8a8d\u8fd4\u56de\u985e\u578b\u4e00\u81f4\u6027\u4ee5\u53ca\u6b63\u78ba\u8abf\u7528\u51fd\u6578\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 \u9999\u6e2fVPS<\/a> \u670d\u52d9\u53ef\u4ee5\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u5c08\u6ce8\u65bc\u696d\u52d9\u908f\u8f2f\u7684\u5be6\u73fe\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22 MySQL \u5275\u5efa\u51fd\u6578\u7684\u5e38\u898b\u554f\u984c\u53ca\u5176\u89e3\u6c7a\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u5eab\u958b\u767c\u6548\u7387\uff0c\u78ba\u4fdd\u51fd\u6578\u6b63\u78ba\u904b\u884c\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-75848","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75848","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=75848"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75848\/revisions"}],"predecessor-version":[{"id":75849,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75848\/revisions\/75849"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=75848"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=75848"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=75848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}