{"id":152107,"date":"2024-11-01T20:10:22","date_gmt":"2024-11-01T12:10:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152107\/"},"modified":"2024-11-01T20:10:23","modified_gmt":"2024-11-01T12:10:23","slug":"%e7%b7%a8%e5%af%absql%e4%bb%a3%e7%a2%bc%e6%99%82%e8%a6%81%e9%81%bf%e5%85%8d%e7%9a%84%e5%b8%b8%e8%a6%8b%e9%8c%af%e8%aa%a4","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152107\/","title":{"rendered":"\u7de8\u5bebSQL\u4ee3\u78bc\u6642\u8981\u907f\u514d\u7684\u5e38\u898b\u932f\u8aa4"},"content":{"rendered":"

\u7de8\u5bebSQL\u4ee3\u78bc\u6642\u8981\u907f\u514d\u7684\u5e38\u898b\u932f\u8aa4<\/h1>\n

SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u6a19\u6e96\u8a9e\u8a00\u3002\u96d6\u7136SQL\u8a9e\u6cd5\u76f8\u5c0d\u7c21\u55ae\uff0c\u4f46\u5728\u7de8\u5bebSQL\u4ee3\u78bc\u6642\uff0c\u958b\u767c\u8005\u5e38\u5e38\u6703\u72af\u4e00\u4e9b\u5e38\u898b\u932f\u8aa4\uff0c\u9019\u4e9b\u932f\u8aa4\u53ef\u80fd\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u6216\u6578\u64da\u4e0d\u4e00\u81f4\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u5728\u7de8\u5bebSQL\u4ee3\u78bc\u6642\u61c9\u907f\u514d\u7684\u5e38\u898b\u932f\u8aa4\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n

1. \u5ffd\u7565\u7d22\u5f15\u7684\u4f7f\u7528<\/h2>\n

\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u91cd\u8981\u5de5\u5177\u3002\u8a31\u591a\u958b\u767c\u8005\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u53ef\u80fd\u6703\u5ffd\u7565\u70ba\u8868\u6dfb\u52a0\u7d22\u5f15\uff0c\u9019\u6703\u5c0e\u81f4\u67e5\u8a62\u901f\u5ea6\u7de9\u6162\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u7f3a\u4e4f\u7d22\u5f15\u7684\u67e5\u8a62\u53ef\u80fd\u9700\u8981\u5168\u8868\u6383\u63cf\uff0c\u5f9e\u800c\u5f71\u97ff\u6027\u80fd\u3002<\/p>\n

-- \u932f\u8aa4\u793a\u4f8b\uff1a\u672a\u4f7f\u7528\u7d22\u5f15\u7684\u67e5\u8a62\nSELECT * FROM users WHERE last_name = 'Smith';\n<\/code><\/pre>\n
\u89e3\u6c7a\u65b9\u6848\u662f\u70ba\u7d93\u5e38\u67e5\u8a62\u7684\u5217\u6dfb\u52a0\u7d22\u5f15\u3002\u4f8b\u5982\uff1a<\/p>\n
-- \u6b63\u78ba\u793a\u4f8b\uff1a\u70ba last_name \u5217\u6dfb\u52a0\u7d22\u5f15\nCREATE INDEX idx_last_name ON users(last_name);\n<\/code><\/pre>\n
2. \u4f7f\u7528 SELECT *<\/h2>\n
\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528 SELECT *<\/code> \u6703\u9078\u64c7\u8868\u4e2d\u7684\u6240\u6709\u5217\uff0c\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u5c0e\u81f4\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u548c\u6027\u80fd\u4e0b\u964d\u3002\u7279\u5225\u662f\u5728\u5927\u578b\u8868\u4e2d\uff0c\u9019\u6a23\u7684\u67e5\u8a62\u6703\u6d88\u8017\u66f4\u591a\u7684\u8cc7\u6e90\u3002<\/p>\n
-- \u932f\u8aa4\u793a\u4f8b\uff1a\u4f7f\u7528 SELECT *\nSELECT * FROM orders;\n<\/code><\/pre>\n
\u5efa\u8b70\u660e\u78ba\u6307\u5b9a\u6240\u9700\u7684\u5217\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff1a<\/p>\n
-- \u6b63\u78ba\u793a\u4f8b\uff1a\u660e\u78ba\u6307\u5b9a\u5217\nSELECT order_id, order_date FROM orders;\n<\/code><\/pre>\n
3. \u5ffd\u7565\u6578\u64da\u985e\u578b<\/h2>\n
\u5728\u5275\u5efa\u8868\u6642\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u81f3\u95dc\u91cd\u8981\u3002\u4f7f\u7528\u4e0d\u6b63\u78ba\u7684\u6578\u64da\u985e\u578b\u53ef\u80fd\u5c0e\u81f4\u5b58\u5132\u7a7a\u9593\u6d6a\u8cbb\u6216\u6027\u80fd\u554f\u984c\u3002\u4f8b\u5982\uff0c\u5c07\u4e00\u500b\u53ea\u9700\u5b58\u5132\u5c0f\u6574\u6578\u7684\u5217\u8a2d\u7f6e\u70ba INT<\/code> \u985e\u578b\uff0c\u800c\u4e0d\u662f TINYINT<\/code>\uff0c\u6703\u5c0e\u81f4\u4e0d\u5fc5\u8981\u7684\u7a7a\u9593\u6d6a\u8cbb\u3002<\/p>\n
-- \u932f\u8aa4\u793a\u4f8b\uff1a\u4f7f\u7528\u4e0d\u5408\u9069\u7684\u6578\u64da\u985e\u578b\nCREATE TABLE products (\n    product_id INT,\n    product_name VARCHAR(255),\n    stock_quantity INT\n);\n<\/code><\/pre>\n
\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\uff1a<\/p>\n
-- \u6b63\u78ba\u793a\u4f8b\uff1a\u4f7f\u7528\u5408\u9069\u7684\u6578\u64da\u985e\u578b\nCREATE TABLE products (\n    product_id INT,\n    product_name VARCHAR(100),\n    stock_quantity TINYINT\n);\n<\/code><\/pre>\n
4. \u5ffd\u7565\u4e8b\u52d9\u8655\u7406<\/h2>\n
\u5728\u9032\u884c\u591a\u500b\u6578\u64da\u64cd\u4f5c\u6642\uff0c\u5ffd\u7565\u4e8b\u52d9\u8655\u7406\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u3002\u4e8b\u52d9\u78ba\u4fdd\u4e00\u7d44\u64cd\u4f5c\u8981\u9ebc\u5168\u90e8\u6210\u529f\uff0c\u8981\u9ebc\u5168\u90e8\u5931\u6557\uff0c\u5f9e\u800c\u4fdd\u6301\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002<\/p>\n
-- \u932f\u8aa4\u793a\u4f8b\uff1a\u672a\u4f7f\u7528\u4e8b\u52d9\nUPDATE accounts SET balance = balance - 100 WHERE account_id = 1;\nUPDATE accounts SET balance = balance + 100 WHERE account_id = 2;\n<\/code><\/pre>\n
\u61c9\u4f7f\u7528\u4e8b\u52d9\u4f86\u78ba\u4fdd\u64cd\u4f5c\u7684\u539f\u5b50\u6027\uff1a<\/p>\n
-- \u6b63\u78ba\u793a\u4f8b\uff1a\u4f7f\u7528\u4e8b\u52d9\nBEGIN;\nUPDATE accounts SET balance = balance - 100 WHERE account_id = 1;\nUPDATE accounts SET balance = balance + 100 WHERE account_id = 2;\nCOMMIT;\n<\/code><\/pre>\n
5. \u4e0d\u8003\u616eSQL\u6ce8\u5165<\/h2>\n
SQL\u6ce8\u5165\u662f\u4e00\u7a2e\u5e38\u898b\u7684\u5b89\u5168\u6f0f\u6d1e\uff0c\u653b\u64ca\u8005\u53ef\u4ee5\u901a\u904e\u64cd\u7e31SQL\u67e5\u8a62\u4f86\u8a2a\u554f\u6216\u4fee\u6539\u6578\u64da\u3002\u958b\u767c\u8005\u61c9\u59cb\u7d42\u4f7f\u7528\u53c3\u6578\u5316\u67e5\u8a62\u6216\u9810\u8655\u7406\u8a9e\u53e5\u4f86\u9632\u6b62SQL\u6ce8\u5165\u3002<\/p>\n
-- \u932f\u8aa4\u793a\u4f8b\uff1a\u6613\u53d7SQL\u6ce8\u5165\u653b\u64ca\u7684\u67e5\u8a62\nSELECT * FROM users WHERE username = '\" + userInput + \"';\n<\/code><\/pre>\n
\u61c9\u4f7f\u7528\u53c3\u6578\u5316\u67e5\u8a62\u4f86\u63d0\u9ad8\u5b89\u5168\u6027\uff1a<\/p>\n
-- \u6b63\u78ba\u793a\u4f8b\uff1a\u4f7f\u7528\u53c3\u6578\u5316\u67e5\u8a62\nSELECT * FROM users WHERE username = ?;\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u7de8\u5bebSQL\u4ee3\u78bc\u6642\uff0c\u907f\u514d\u4e0a\u8ff0\u5e38\u898b\u932f\u8aa4\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u5b89\u5168\u6027\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u7d22\u5f15\u3001\u660e\u78ba\u6307\u5b9a\u67e5\u8a62\u5217\u3001\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u3001\u4f7f\u7528\u4e8b\u52d9\u8655\u7406\u4ee5\u53ca\u9632\u7bc4SQL\u6ce8\u5165\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u78ba\u4fdd\u5176\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u9ad8\u6548\u6027\u548c\u5b89\u5168\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u7a69\u5b9a\u904b\u884c\u548c\u5feb\u901f\u97ff\u61c9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u7de8\u5bebSQL\u4ee3\u78bc\u6642\u5e38\u898b\u7684\u932f\u8aa4\uff0c\u907f\u514d\u6027\u80fd\u554f\u984c\u548c\u6578\u64da\u4e0d\u4e00\u81f4\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u548c\u4ee3\u78bc\u8cea\u91cf\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-152107","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152107","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=152107"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152107\/revisions"}],"predecessor-version":[{"id":152108,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152107\/revisions\/152108"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=152107"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=152107"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=152107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}