{"id":75926,"date":"2024-10-16T02:23:15","date_gmt":"2024-10-15T18:23:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/75926\/"},"modified":"2024-10-16T02:23:15","modified_gmt":"2024-10-15T18:23:15","slug":"mysql-%e7%9a%84%e6%95%b8%e6%93%9a%e7%b5%90%e6%a7%8b%e5%ae%8c%e5%85%a8%e8%a7%a3%e6%9e%90-mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%89%80%e6%9c%89%e6%95%b8%e6%93%9a%e7%b5%90%e6%a7%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/75926\/","title":{"rendered":"MySQL \u7684\u6578\u64da\u7d50\u69cb\u5b8c\u5168\u89e3\u6790 (MySQL\u6578\u64da\u5eab\u6240\u6709\u6578\u64da\u7d50\u69cb)"},"content":{"rendered":"

MySQL \u7684\u6578\u64da\u7d50\u69cb\u5b8c\u5168\u89e3\u6790<\/h1>\n

MySQL \u662f\u4e00\u7a2e\u6d41\u884c\u7684\u958b\u6e90\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u4e86\u89e3 MySQL \u7684\u6578\u64da\u7d50\u69cb\u5c0d\u65bc\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u4f86\u8aaa\u81f3\u95dc\u91cd\u8981\uff0c\u56e0\u70ba\u9019\u6709\u52a9\u65bc\u512a\u5316\u6578\u64da\u5b58\u5132\u548c\u67e5\u8a62\u6027\u80fd\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e MySQL \u7684\u4e3b\u8981\u6578\u64da\u7d50\u69cb\uff0c\u5305\u62ec\u8868\u3001\u7d22\u5f15\u3001\u8996\u5716\u3001\u5b58\u5132\u904e\u7a0b\u548c\u89f8\u767c\u5668\u7b49\u3002<\/p>\n

1. \u8868\uff08Tables\uff09<\/h2>\n

\u5728 MySQL \u4e2d\uff0c\u6578\u64da\u4ee5\u8868\u7684\u5f62\u5f0f\u5b58\u5132\u3002\u6bcf\u500b\u8868\u7531\u884c\u548c\u5217\u7d44\u6210\uff0c\u884c\u4ee3\u8868\u8a18\u9304\uff0c\u5217\u4ee3\u8868\u5b57\u6bb5\u3002\u8868\u7684\u7d50\u69cb\u53ef\u4ee5\u901a\u904e SQL \u8a9e\u53e5\u4f86\u5b9a\u7fa9\uff0c\u4f8b\u5982\uff1a<\/p>\n

CREATE TABLE users (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50) NOT NULL,\n    password VARCHAR(255) NOT NULL,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba “users” \u7684\u8868\uff0c\u5305\u542b\u56db\u500b\u5b57\u6bb5\uff1aid\u3001username\u3001password \u548c created_at\u3002<\/p>\n
2. \u7d22\u5f15\uff08Indexes\uff09<\/h2>\n
\u7d22\u5f15\u662f\u7528\u65bc\u52a0\u901f\u67e5\u8a62\u7684\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\u3002MySQL \u652f\u6301\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u5305\u62ec\u4e3b\u9375\u7d22\u5f15\u3001\u552f\u4e00\u7d22\u5f15\u548c\u666e\u901a\u7d22\u5f15\u3002\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u4e5f\u6703\u589e\u52a0\u6578\u64da\u5beb\u5165\u7684\u958b\u92b7\u3002<\/p>\n
\u4f8b\u5982\uff0c\u5275\u5efa\u4e00\u500b\u7d22\u5f15\u7684 SQL \u8a9e\u53e5\u5982\u4e0b\uff1a<\/p>\n
CREATE INDEX idx_username ON users (username);<\/code><\/pre>\n
\u9019\u5c07\u5728 “users” \u8868\u7684 “username” \u5217\u4e0a\u5275\u5efa\u4e00\u500b\u7d22\u5f15\uff0c\u5f9e\u800c\u52a0\u5feb\u57fa\u65bc\u7528\u6236\u540d\u7684\u67e5\u8a62\u901f\u5ea6\u3002<\/p>\n
3. \u8996\u5716\uff08Views\uff09<\/h2>\n
\u8996\u5716\u662f\u57fa\u65bc\u4e00\u500b\u6216\u591a\u500b\u8868\u7684\u865b\u64ec\u8868\u3002\u5b83\u4e0d\u5b58\u5132\u6578\u64da\uff0c\u800c\u662f\u5b58\u5132\u67e5\u8a62\u3002\u8996\u5716\u53ef\u4ee5\u7c21\u5316\u8907\u96dc\u67e5\u8a62\uff0c\u4e26\u63d0\u4f9b\u6578\u64da\u7684\u5b89\u5168\u6027\u3002<\/p>\n
\u5275\u5efa\u8996\u5716\u7684 SQL \u8a9e\u53e5\u5982\u4e0b\uff1a<\/p>\n
CREATE VIEW active_users AS\nSELECT * FROM users WHERE status = 'active';<\/code><\/pre>\n
\u9019\u5c07\u5275\u5efa\u4e00\u500b\u540d\u70ba “active_users” \u7684\u8996\u5716\uff0c\u986f\u793a\u6240\u6709\u72c0\u614b\u70ba “active” \u7684\u7528\u6236\u3002<\/p>\n
4. \u5b58\u5132\u904e\u7a0b\uff08Stored Procedures\uff09<\/h2>\n
\u5b58\u5132\u904e\u7a0b\u662f\u4e00\u7d44\u9810\u7de8\u8b6f\u7684 SQL \u8a9e\u53e5\uff0c\u53ef\u4ee5\u5728\u6578\u64da\u5eab\u4e2d\u57f7\u884c\u3002\u5b83\u5011\u53ef\u4ee5\u63a5\u53d7\u53c3\u6578\u4e26\u8fd4\u56de\u7d50\u679c\uff0c\u5f9e\u800c\u63d0\u9ad8\u4ee3\u78bc\u7684\u91cd\u7528\u6027\u548c\u57f7\u884c\u6548\u7387\u3002<\/p>\n
\u5275\u5efa\u5b58\u5132\u904e\u7a0b\u7684 SQL \u8a9e\u53e5\u5982\u4e0b\uff1a<\/p>\n
CREATE PROCEDURE GetUserById(IN userId INT)\nBEGIN\n    SELECT * FROM users WHERE id = userId;\nEND;<\/code><\/pre>\n
\u9019\u500b\u5b58\u5132\u904e\u7a0b\u63a5\u53d7\u4e00\u500b\u7528\u6236 ID \u4f5c\u70ba\u53c3\u6578\uff0c\u4e26\u8fd4\u56de\u5c0d\u61c9\u7684\u7528\u6236\u4fe1\u606f\u3002<\/p>\n
5. \u89f8\u767c\u5668\uff08Triggers\uff09<\/h2>\n
\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5b58\u5132\u904e\u7a0b\uff0c\u6703\u5728\u7279\u5b9a\u4e8b\u4ef6\uff08\u5982\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\uff09\u767c\u751f\u6642\u81ea\u52d5\u57f7\u884c\u3002\u89f8\u767c\u5668\u53ef\u4ee5\u7528\u65bc\u6578\u64da\u9a57\u8b49\u548c\u81ea\u52d5\u5316\u4efb\u52d9\u3002<\/p>\n
\u5275\u5efa\u89f8\u767c\u5668\u7684 SQL \u8a9e\u53e5\u5982\u4e0b\uff1a<\/p>\n
CREATE TRIGGER before_user_insert\nBEFORE INSERT ON users\nFOR EACH ROW\nBEGIN\n    SET NEW.created_at = NOW();\nEND;<\/code><\/pre>\n
\u9019\u500b\u89f8\u767c\u5668\u5728\u63d2\u5165\u65b0\u7528\u6236\u4e4b\u524d\u81ea\u52d5\u8a2d\u7f6e “created_at” \u5b57\u6bb5\u70ba\u7576\u524d\u6642\u9593\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
MySQL \u7684\u6578\u64da\u7d50\u69cb\u5305\u62ec\u8868\u3001\u7d22\u5f15\u3001\u8996\u5716\u3001\u5b58\u5132\u904e\u7a0b\u548c\u89f8\u767c\u5668\u7b49\uff0c\u6bcf\u7a2e\u7d50\u69cb\u90fd\u6709\u5176\u7279\u5b9a\u7684\u7528\u9014\u548c\u512a\u52e2\u3002\u4e86\u89e3\u9019\u4e9b\u6578\u64da\u7d50\u69cb\u7684\u7279\u6027\u548c\u4f7f\u7528\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u8a2d\u8a08\u548c\u7ba1\u7406\u6578\u64da\u5eab\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u7d50\u69cb\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 \u9999\u6e2f VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6df1\u5165\u89e3\u6790MySQL\u6578\u64da\u5eab\u7684\u6240\u6709\u6578\u64da\u7d50\u69cb\uff0c\u4e86\u89e3\u5176\u8a2d\u8a08\u539f\u7406\u3001\u6027\u80fd\u512a\u5316\u53ca\u61c9\u7528\u5834\u666f\uff0c\u52a9\u4f60\u63d0\u5347\u6578\u64da\u7ba1\u7406\u80fd\u529b\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-75926","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75926","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=75926"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75926\/revisions"}],"predecessor-version":[{"id":75927,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75926\/revisions\/75927"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=75926"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=75926"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=75926"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}