{"id":200057,"date":"2025-05-06T10:13:39","date_gmt":"2025-05-06T02:13:39","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200057\/"},"modified":"2025-05-06T10:13:39","modified_gmt":"2025-05-06T02:13:39","slug":"%e9%80%9a%e8%bf%87mysql%e5%ae%9e%e7%8e%b0%e7%b1%bb%e4%bc%bc%e4%ba%8epl-sql%e7%9a%84%e7%bc%96%e7%a8%8b%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200057\/","title":{"rendered":"\u901a\u8fc7MySQL\u5b9e\u73b0\u7c7b\u4f3c\u4e8ePL\/SQL\u7684\u7f16\u7a0b\u529f\u80fd"},"content":{"rendered":"

<\/b> <\/p>\n

\u901a\u8fc7MySQL\u5b9e\u73b0\u7c7b\u4f3c\u4e8ePL\/SQL\u7684\u7f16\u7a0b\u529f\u80fd<\/h1>\n

\u672c\u7bc7\u6587\u7ae0\u4e3b\u8981\u662f\u7ed3\u5408\u6211\u4e4b\u524d\u9762\u8bd5\u7684\u5404\u79cd\u7ecf\u5386\u548c\u5b9e\u6218\u5f00\u53d1\u4e2d\u9047\u5230\u7684\u95ee\u9898\u89e3\u51b3\u7ecf\u9a8c\u6574\u7406\u7684\uff0c\u5e0c\u671b\u8fd9\u7bc7\u300a\u901a\u8fc7MySQL\u5b9e\u73b0\u7c7b\u4f3c\u4e8ePL\/SQL\u7684\u7f16\u7a0b\u529f\u80fd\u300b\u5bf9\u4f60\u6709\u5f88\u5927\u5e2e\u52a9\uff01\u6b22\u8fce\u6536\u85cf\uff0c\u5206\u4eab\u7ed9\u66f4\u591a\u7684\u9700\u8981\u7684\u670b\u53cb\u5b66\u4e60~<\/p>\n

\u5728MySQL\u4e2d\u5b9e\u73b0\u7c7b\u4f3cPL\/SQL\u7684\u7f16\u7a0b\u529f\u80fd\u4e0d\u4ec5\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u7075\u6d3b\u6027\u548c\u6548\u7387\uff0c\u8fd8\u80fd\u66f4\u597d\u5730\u5b9e\u73b0\u590d\u6742\u4e1a\u52a1\u903b\u8f91\u5904\u7406\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u5b58\u50a8\u8fc7\u7a0b\u3001\u51fd\u6570\u548c\u89e6\u53d1\u5668\u7b49\u529f\u80fd\u6765\u5b9e\u73b0\u7c7b\u4f3cPL\/SQL\u7684\u7f16\u7a0b\u529f\u80fd\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

1. \u521b\u5efa\u5b58\u50a8\u8fc7\u7a0b<\/h3>\n

\u5b58\u50a8\u8fc7\u7a0b\u662f\u4e00\u7ec4\u9884\u7f16\u8bd1\u7684SQL\u8bed\u53e5\uff0c\u53ef\u4ee5\u88ab\u91cd\u590d\u8c03\u7528\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5b58\u50a8\u8fc7\u7a0b\u793a\u4f8b\uff0c\u7528\u4e8e\u67e5\u8be2\u6307\u5b9a\u90e8\u95e8\u7684\u5458\u5de5\u6570\u91cf\uff1a<\/p>\n

DELIMITER \/\/\nCREATE PROCEDURE GetEmployeeCountByDepartment(IN department_name VARCHAR(50))\nBEGIN\n    DECLARE employee_count INT;\n    \n    SELECT COUNT(*) INTO employee_count\n    FROM employees\n    WHERE department = department_name;\n    \n    SELECT employee_count;\nEND \/\/\nDELIMITER ;<\/pre>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0cGetEmployeeCountByDepartment<\/code>\u662f\u5b58\u50a8\u8fc7\u7a0b\u7684\u540d\u79f0\uff0cIN department_name<\/code>\u8868\u793a\u8f93\u5165\u53c2\u6570\uff0cDECLARE<\/code>\u7528\u4e8e\u58f0\u660e\u53d8\u91cf\uff0cINTO<\/code>\u8868\u793a\u5c06\u67e5\u8be2\u7ed3\u679c\u8d4b\u503c\u7ed9\u53d8\u91cf\u3002<\/p>\n
2. \u521b\u5efa\u51fd\u6570<\/h3>\n
\u51fd\u6570\u662f\u4e00\u7ec4SQL\u8bed\u53e5\uff0c\u53ef\u4ee5\u63a5\u53d7\u53c2\u6570\u5e76\u8fd4\u56de\u4e00\u4e2a\u503c\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u51fd\u6570\u793a\u4f8b\uff0c\u7528\u4e8e\u8ba1\u7b97\u5458\u5de5\u7684\u5e74\u85aa\uff1a<\/p>\n
DELIMITER \/\/\nCREATE FUNCTION CalculateAnnualSalary(salary DECIMAL(10, 2), bonus DECIMAL(10, 2))\nRETURNS DECIMAL(10, 2)\nBEGIN\n    DECLARE annual_salary DECIMAL(10, 2);\n    \n    SET annual_salary = salary * 12 + bonus;\n    \n    RETURN annual_salary;\nEND \/\/\nDELIMITER ;<\/pre>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0cCalculateAnnualSalary<\/code>\u662f\u51fd\u6570\u7684\u540d\u79f0\uff0cRETURNS<\/code>\u7528\u4e8e\u58f0\u660e\u8fd4\u56de\u503c\u7c7b\u578b\uff0c\u51fd\u6570\u5185\u90e8\u7684\u903b\u8f91\u4e0e\u5b58\u50a8\u8fc7\u7a0b\u7c7b\u4f3c\u3002<\/p>\n
3. \u521b\u5efa\u89e6\u53d1\u5668<\/h3>\n
\u89e6\u53d1\u5668\u662f\u4e0e\u8868\u76f8\u5173\u8054\u7684\u4e00\u6bb5\u4ee3\u7801\uff0c\u53ef\u4ee5\u5728\u63d2\u5165\u3001\u5220\u9664\u6216\u66f4\u65b0\u8868\u4e2d\u7684\u6570\u636e\u65f6\u89e6\u53d1\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u89e6\u53d1\u5668\u793a\u4f8b\uff0c\u7528\u4e8e\u5728\u5458\u5de5\u8868\u4e2d\u63d2\u5165\u6570\u636e\u65f6\u81ea\u52a8\u66f4\u65b0\u90e8\u95e8\u8868\u4e2d\u5458\u5de5\u6570\u91cf\uff1a<\/p>\n
DELIMITER \/\/\nCREATE TRIGGER UpdateEmployeeCount\nAFTER INSERT ON employees\nFOR EACH ROW\nBEGIN\n    UPDATE departments\n    SET employee_count = employee_count + 1\n    WHERE department = NEW.department;\nEND \/\/\nDELIMITER ;<\/pre>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0cUpdateEmployeeCount<\/code>\u662f\u89e6\u53d1\u5668\u7684\u540d\u79f0\uff0cAFTER INSERT<\/code>\u8868\u793a\u5728\u63d2\u5165\u6570\u636e\u540e\u89e6\u53d1\uff0cNEW<\/code>\u662f\u4e00\u4e2a\u7279\u6b8a\u5173\u952e\u5b57\uff0c\u7528\u4e8e\u5f15\u7528\u63d2\u5165\u7684\u65b0\u6570\u636e\u3002<\/p>\n
\u603b\u7ed3<\/h3>\n
\u901a\u8fc7\u5b58\u50a8\u8fc7\u7a0b\u3001\u51fd\u6570\u548c\u89e6\u53d1\u5668\u7b49\u529f\u80fd\uff0c\u53ef\u4ee5\u5728MySQL\u4e2d\u5b9e\u73b0\u7c7b\u4f3cPL\/SQL\u7684\u7f16\u7a0b\u529f\u80fd\uff0c\u63d0\u9ad8\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u7075\u6d3b\u6027\u548c\u6548\u7387\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u6839\u636e\u4e1a\u52a1\u9700\u6c42\u7f16\u5199\u66f4\u590d\u6742\u7684\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\uff0c\u5b9e\u73b0\u66f4\u591a\u529f\u80fd\u3002<\/p>\n
\u4ee5\u4e0a\u4ec5\u4e3a\u7b80\u5355\u793a\u4f8b\uff0c\u8bfb\u8005\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u9700\u6c42\u548c\u60c5\u666f\u8fdb\u884c\u6269\u5c55\u548c\u4fee\u6539\uff0c\u4ee5\u5b9e\u73b0\u66f4\u52a0\u4e30\u5bcc\u548c\u590d\u6742\u7684\u6570\u636e\u5e93\u7f16\u7a0b\u529f\u80fd\u3002\u5e0c\u671b\u672c\u6587\u5bf9\u8bfb\u8005\u6709\u6240\u5e2e\u52a9\uff0c\u8c22\u8c22\u9605\u8bfb\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300a\u901a\u8fc7MySQL\u5b9e\u73b0\u7c7b\u4f3c\u4e8ePL\/SQL\u7684\u7f16\u7a0b\u529f\u80fd\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n
\n
\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
\u901a\u8fc7MySQL\u5b9e\u73b0\u7c7b\u4f3c\u4e8ePL\/S...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200057","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200057","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200057"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200057\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200057"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200057"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200057"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}