{"id":76604,"date":"2024-10-16T08:15:17","date_gmt":"2024-10-16T00:15:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76604\/"},"modified":"2024-10-16T08:15:18","modified_gmt":"2024-10-16T00:15:18","slug":"mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%af%a6%e7%8f%be%e8%87%aa%e5%8b%95%e6%95%b8%e6%93%9a%e5%89%b5%e5%bb%ba-mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e8%87%aa%e5%8b%95%e5%89%b5%e5%bb%ba%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76604\/","title":{"rendered":"MySQL\u6578\u64da\u5eab\u5be6\u73fe\u81ea\u52d5\u6578\u64da\u5275\u5efa (MySQL\u6578\u64da\u5eab\u81ea\u52d5\u5275\u5efa\u6578\u64da)"},"content":{"rendered":"<h1 id=\"mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%af%a6%e7%8f%be%e8%87%aa%e5%8b%95%e6%95%b8%e6%93%9a%e5%89%b5%e5%bb%ba-dMPechedMl\">MySQL\u6578\u64da\u5eab\u5be6\u73fe\u81ea\u52d5\u6578\u64da\u5275\u5efa<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u81ea\u52d5\u5316\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u652f\u6301\u81ea\u52d5\u6578\u64da\u5275\u5efa\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728MySQL\u4e2d\u5be6\u73fe\u81ea\u52d5\u6578\u64da\u5275\u5efa\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e8%87%aa%e5%8b%95%e6%95%b8%e6%93%9a%e5%89%b5%e5%bb%ba%e7%9a%84%e5%bf%85%e8%a6%81%e6%80%a7-dMPechedMl\">\u81ea\u52d5\u6578\u64da\u5275\u5efa\u7684\u5fc5\u8981\u6027<\/h2>\n<p>\u81ea\u52d5\u6578\u64da\u5275\u5efa\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u7bc0\u7701\u6642\u9593\uff0c\u6e1b\u5c11\u624b\u52d5\u64cd\u4f5c\u7684\u932f\u8aa4\uff0c\u4e26\u63d0\u9ad8\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u7279\u5225\u662f\u5728\u9700\u8981\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u81ea\u52d5\u5316\u7684\u904e\u7a0b\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e8%a7%b8%e7%99%bc%e5%99%a8%e5%af%a6%e7%8f%be%e8%87%aa%e5%8b%95%e6%95%b8%e6%93%9a%e5%89%b5%e5%bb%ba-dMPechedMl\">\u4f7f\u7528\u89f8\u767c\u5668\u5be6\u73fe\u81ea\u52d5\u6578\u64da\u5275\u5efa<\/h2>\n<p>MySQL\u7684\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5b58\u5132\u7a0b\u5e8f\uff0c\u53ef\u4ee5\u5728\u7279\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\u81ea\u52d5\u57f7\u884c\u3002\u9019\u4e9b\u4e8b\u4ef6\u5305\u62ec\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u89f8\u767c\u5668\u81ea\u52d5\u5275\u5efa\u6578\u64da\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE orders (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    product_name VARCHAR(255) NOT NULL,\n    quantity INT NOT NULL,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);\n\nCREATE TABLE inventory (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    product_name VARCHAR(255) NOT NULL,\n    stock INT NOT NULL\n);\n\nDELIMITER \/\/\nCREATE TRIGGER after_order_insert\nAFTER INSERT ON orders\nFOR EACH ROW\nBEGIN\n    DECLARE current_stock INT;\n    \n    SELECT stock INTO current_stock FROM inventory WHERE product_name = NEW.product_name;\n    \n    IF current_stock IS NOT NULL THEN\n        UPDATE inventory SET stock = stock - NEW.quantity WHERE product_name = NEW.product_name;\n    END IF;\nEND;\n\/\/\nDELIMITER ;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u7576\u4e00\u500b\u65b0\u7684\u8a02\u55ae\u88ab\u63d2\u5165\u5230`orders`\u8868\u4e2d\u6642\uff0c\u89f8\u767c\u5668`after_order_insert`\u6703\u81ea\u52d5\u66f4\u65b0`inventory`\u8868\u4e2d\u7684\u5eab\u5b58\u6578\u91cf\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5eab\u5b58\u6578\u64da\u7684\u5373\u6642\u66f4\u65b0\uff0c\u907f\u514d\u624b\u52d5\u64cd\u4f5c\u7684\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e5%af%a6%e7%8f%be%e8%87%aa%e5%8b%95%e6%95%b8%e6%93%9a%e5%89%b5%e5%bb%ba-dMPechedMl\">\u4f7f\u7528\u5b58\u5132\u904e\u7a0b\u5be6\u73fe\u81ea\u52d5\u6578\u64da\u5275\u5efa<\/h2>\n<p>\u5b58\u5132\u904e\u7a0b\u662f\u4e00\u7d44\u9810\u7de8\u8b6f\u7684SQL\u8a9e\u53e5\uff0c\u53ef\u4ee5\u5728\u6578\u64da\u5eab\u4e2d\u57f7\u884c\u3002\u958b\u767c\u8005\u53ef\u4ee5\u901a\u904e\u8abf\u7528\u5b58\u5132\u904e\u7a0b\u4f86\u81ea\u52d5\u5275\u5efa\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>DELIMITER \/\/\nCREATE PROCEDURE create_order(IN p_product_name VARCHAR(255), IN p_quantity INT)\nBEGIN\n    INSERT INTO orders (product_name, quantity) VALUES (p_product_name, p_quantity);\n    \n    DECLARE current_stock INT;\n    \n    SELECT stock INTO current_stock FROM inventory WHERE product_name = p_product_name;\n    \n    IF current_stock IS NOT NULL THEN\n        UPDATE inventory SET stock = stock - p_quantity WHERE product_name = p_product_name;\n    END IF;\nEND;\n\/\/\nDELIMITER ;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u5b58\u5132\u904e\u7a0b`create_order`\u63a5\u53d7\u7522\u54c1\u540d\u7a31\u548c\u6578\u91cf\u4f5c\u70ba\u53c3\u6578\uff0c\u4e26\u81ea\u52d5\u63d2\u5165\u8a02\u55ae\uff0c\u540c\u6642\u66f4\u65b0\u5eab\u5b58\u3002\u9019\u6a23\u7684\u8a2d\u8a08\u4f7f\u5f97\u6578\u64da\u5275\u5efa\u904e\u7a0b\u66f4\u52a0\u7c21\u55ae\u548c\u9ad8\u6548\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e4%ba%8b%e4%bb%b6%e8%aa%bf%e5%ba%a6%e5%99%a8%e5%af%a6%e7%8f%be%e5%ae%9a%e6%9c%9f%e6%95%b8%e6%93%9a%e5%89%b5%e5%bb%ba-dMPechedMl\">\u4f7f\u7528\u4e8b\u4ef6\u8abf\u5ea6\u5668\u5be6\u73fe\u5b9a\u671f\u6578\u64da\u5275\u5efa<\/h2>\n<p>MySQL\u7684\u4e8b\u4ef6\u8abf\u5ea6\u5668\u5141\u8a31\u7528\u6236\u5b9a\u671f\u57f7\u884c\u67d0\u4e9b\u64cd\u4f5c\u3002\u9019\u5c0d\u65bc\u9700\u8981\u5b9a\u671f\u66f4\u65b0\u6216\u5275\u5efa\u6578\u64da\u7684\u60c5\u6cc1\u975e\u5e38\u6709\u7528\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE EVENT auto_create_order\nON SCHEDULE EVERY 1 DAY\nDO\nBEGIN\n    INSERT INTO orders (product_name, quantity) VALUES ('Sample Product', 10);\n    \n    DECLARE current_stock INT;\n    \n    SELECT stock INTO current_stock FROM inventory WHERE product_name = 'Sample Product';\n    \n    IF current_stock IS NOT NULL THEN\n        UPDATE inventory SET stock = stock - 10 WHERE product_name = 'Sample Product';\n    END IF;\nEND;<\/code><\/pre>\n<p>\u9019\u500b\u4e8b\u4ef6\u6bcf\u5929\u81ea\u52d5\u5275\u5efa\u4e00\u500b\u65b0\u7684\u8a02\u55ae\uff0c\u4e26\u66f4\u65b0\u5eab\u5b58\u3002\u9019\u6a23\u7684\u81ea\u52d5\u5316\u53ef\u4ee5\u5e6b\u52a9\u4f01\u696d\u66f4\u597d\u5730\u7ba1\u7406\u5eab\u5b58\u548c\u8a02\u55ae\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-dMPechedMl\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u81ea\u52d5\u6578\u64da\u5275\u5efa\uff0c\u5305\u62ec\u89f8\u767c\u5668\u3001\u5b58\u5132\u904e\u7a0b\u548c\u4e8b\u4ef6\u8abf\u5ea6\u5668\u3002\u9019\u4e9b\u529f\u80fd\u4e0d\u50c5\u63d0\u9ad8\u4e86\u6578\u64da\u7ba1\u7406\u7684\u6548\u7387\uff0c\u9084\u6e1b\u5c11\u4e86\u624b\u52d5\u64cd\u4f5c\u7684\u932f\u8aa4\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9019\u4e9b\u5de5\u5177\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u548c\u61c9\u7528\u7a0b\u5e8f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u5728MySQL\u6578\u64da\u5eab\u4e2d\u5be6\u73fe\u81ea\u52d5\u6578\u64da\u5275\u5efa\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u7c21\u5316\u958b\u767c\u6d41\u7a0b\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-76604","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76604","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=76604"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76604\/revisions"}],"predecessor-version":[{"id":76605,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76604\/revisions\/76605"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76604"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76604"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}