{"id":49351,"date":"2023-05-31T17:03:20","date_gmt":"2023-01-28T08:17:07","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/django-mysql-%e5%bd%93%e4%bd%bf%e7%94%a8-transaction-atomic-%e5%92%8c-select_for_update-%e9%94%81%e5%ae%9a%e8%ae%b0%e5%bd%95%e6%97%b6%e7%9a%84%e7%ac%94%e8%ae%b0\/"},"modified":"2024-04-30T06:49:06","modified_gmt":"2024-04-29T22:49:06","slug":"django-mysql-%e5%bd%93%e4%bd%bf%e7%94%a8-transaction-atomic-%e5%92%8c-select_for_update-%e9%94%81%e5%ae%9a%e8%ae%b0%e5%bd%95%e6%97%b6%e7%9a%84%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/django-mysql-%e5%bd%93%e4%bd%bf%e7%94%a8-transaction-atomic-%e5%92%8c-select_for_update-%e9%94%81%e5%ae%9a%e8%ae%b0%e5%bd%95%e6%97%b6%e7%9a%84%e7%ac%94%e8%ae%b0\/","title":{"rendered":"Django + MySQL: \u5f53\u4f7f\u7528 transaction.atomic() \u548c select_for_update() \u9501\u5b9a\u8bb0\u5f55\u65f6\u7684\u7b14\u8bb0"},"content":{"rendered":"

\u7d50\u679c<\/h3>\n

\u5728\u4ee5\u4e0b\u7684\u4ee3\u7801\u4e2d\uff0c\u5373\u4f7f\u5728MySQL\u4e2d\u4e5f\u53ef\u4ee5\u4f7f\u7528transaction.atomic()\u6765\u9501\u5b9a\u8bb0\u5f55\u3002<\/p>\n

from<\/span> django.db<\/span> import<\/span> transaction<\/span>,<\/span> connections<\/span>\r\n\r\nwith<\/span> transaction<\/span>.<\/span>atomic<\/span>(<\/span>using<\/span>=<\/span>\"<\/span>database_name<\/span>\"<\/span>):<\/span>\r\n    connections<\/span>[<\/span>\"<\/span>database_name<\/span>\"<\/span>].<\/span>cursor<\/span>().<\/span>execute<\/span>(<\/span>\"<\/span>BEGIN<\/span>\"<\/span>)<\/span> # <-- \u3053\u3053\r\n<\/span>    target_user<\/span> =<\/span> User<\/span>.<\/span>objects<\/span>.<\/span>select_for_update<\/span>().<\/span>get<\/span>(<\/span>id<\/span>=<\/span>1<\/span>)<\/span>\r\n    target_user<\/span>.<\/span>name<\/span> =<\/span> \"<\/span>name<\/span>\"<\/span>\r\n    target_user<\/span>.<\/span>save<\/span>()<\/span>\r\n<\/code><\/pre>\n
\u60f3\u8981\u505a\u7684\u4e8b\u60c5<\/h3>\n
\u6211\u60f3\u5728Django\u4e2d\u5b9e\u73b0\u5bf9\u6570\u636e\u5e93\u8bb0\u5f55\u7684\u60b2\u89c2\u9501\u548c\u6392\u4ed6\u63a7\u5236\u3002<\/p>\n
\u73af\u5883<\/h3>\n
Django 3.2.12
\nPython 3.6.15
\nMysql 5.7.41<\/p>\n
Django 3.2.12
\nPython 3.6.15
\nMysql 5.7.41<\/p>\n
\u8bf7\u5c06\u4ee5\u4e0b\u5185\u5bb9\u7528\u6c49\u8bed\u8fdb\u884c\u672c\u5730\u5316\u6539\u5199\uff0c\u53ea\u9700\u8981\u4e00\u79cd\u9009\u9879\uff1a<\/h3>\n
\u9996\u5148\uff0c\u5728 SQL \u4e2d\uff0c\u4e3a\u4e86\u9501\u5b9a\u8bb0\u5f55\uff0c\u9700\u8981\u4f7f\u7528\u6570\u636e\u5e93\u3002<\/p>\n
$<\/span> BEGIN<\/span>                   <<\/span>-- \u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u958b\u59cb<\/span>\r\n$<\/span> SELECT<\/span> ****<\/span> FOR<\/span> UPDATE<\/span>  <<\/span>-- \u30c6\u30fc\u30d6\u30eb\u3001\u30ec\u30b3\u30fc\u30c9\u306e\u30ed\u30c3\u30af<\/span>\r\n$<\/span> UPDATE<\/span> ****<\/span>             <<\/span>-- \u66f4\u65b0<\/span>\r\n$<\/span> COMMIT<\/span>                  <<\/span>-- \u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u7d42\u4e86<\/span>\r\n<\/code><\/pre>\n
\u5728\u4ee5BEGIN\u5f00\u59cb\u5e76\u4ee5COMMIT\u7ed3\u675f\u7684\u4e8b\u52a1\u5185\uff0c\u9700\u8981\u6267\u884cFOR UPDATE\u64cd\u4f5c\u3002<\/p>\n
\u800c\u5728Django\u4e2d\u9501\u5b9a\u8bb0\u5f55\uff0c\u8bb8\u591a\u6587\u7ae0\u4e2d\u90fd\u6307\u51fa\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u6cd5\u6765\u64cd\u4f5c\u3002<\/p>\n
from<\/span> django.db<\/span> import<\/span> transaction<\/span>\r\n\r\nwith<\/span> transaction<\/span>.<\/span>atomic<\/span>(<\/span>using<\/span>=<\/span>\"<\/span>database_name<\/span>\"<\/span>):<\/span> # <--\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u958b\u59cb\r\n<\/span>    target_user<\/span> =<\/span> User<\/span>.<\/span>objects<\/span>.<\/span>select_for_update<\/span>().<\/span>get<\/span>(<\/span>id<\/span>=<\/span>1<\/span>)<\/span> # <--\u30ed\u30c3\u30af\r\n<\/span>    target_user<\/span>.<\/span>name<\/span> =<\/span> \"<\/span>name<\/span>\"<\/span>\r\n    target_user<\/span>.<\/span>save<\/span>()<\/span> # <--\u66f4\u65b0\r\n# <-- \u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u7d42\u4e86\r\n<\/span><\/code><\/pre>\n
\u7136\u800c\uff0c\u5373\u4f7f\u6267\u884c\u4e86\u8fd9\u6bb5\u4ee3\u7801\uff0c\u8bb0\u5f55\u5e76\u6ca1\u6709\u88ab\u9501\u5b9a\uff0c\u901a\u8fc7\u67e5\u770b\u6570\u636e\u5e93\u7684SQL\u65e5\u5fd7\uff0c\u53ef\u4ee5\u786e\u8ba4BEGIN\u5e76\u6ca1\u6709\u88ab\u6267\u884c\u3002<\/p>\n
$<\/span> SELECT<\/span> ****<\/span> FOR<\/span> UPDATE<\/span>\r\n$<\/span> UPDATE<\/span> ****<\/span>\r\n$<\/span> COMMIT<\/span>\r\n<\/code><\/pre>\n
\u6362\u53e5\u8bdd\u8bf4\uff0c\u5728\u4f7f\u7528”database_name”\u53c2\u6570\u7684transaction.atomic()\u51fd\u6570\u4e2d\uff0c\u5e76\u6ca1\u6709\u6267\u884cBEGIN\u64cd\u4f5c\u3002<\/p>\n
\u5f53\u9605\u8bfb\u5e93\uff08django.db.transaction\uff09\u7684\u4ee3\u7801\u65f6\uff0c\u6211\u53d1\u73b0transaction.atomic()\u6b63\u8bd5\u56fe\u4e3a\u6bcf\u4e2a\u5728settings.py\u4e2d\u6307\u5b9a\u7684\u6570\u636e\u5e93\u5f15\u64ce\u542f\u52a8\u4e8b\u52a1\u3002<\/p>\n
\u5728django.db.backends.base.base\u7684BaseDatabaseWrapper\u7c7b\u7684set_auto_commit()\u65b9\u6cd5\u4e2d\uff0c\u6839\u636e\u6bcf\u4e2a\u6570\u636e\u5e93\u5f15\u64ce\u7684\u4e8b\u52a1\u5f00\u59cb\u65b9\u6cd5\u6267\u884c\u76f8\u5e94\u7684\u5904\u7406\u3002<\/p>\n
\u5f53\u67e5\u770bdjango.db.backends.*** \uff08*** \u53ef\u4ee5\u662fmysql\u3001sqlite3\u7b49\uff09\u65f6\uff0c\u53ef\u4ee5\u770b\u5230\u5b83\u7ee7\u627f\u4e86BaseDatabaseWrapper\u7c7b\uff0c\u800cmysql\u7684\u7c7b\u4e2d\u6ca1\u6709\u6267\u884cBEGIN\u4ee3\u7801\uff08sqlite3\u4e2d\u6709\uff09\u3002<\/p>\n
\u56e0\u6b64\uff0c\u53ea\u9700\u4f7f\u7528transaction.atomic()\u4e2d\u4f7f\u7528\u7684connection.cursor()\u6765\u6267\u884cBEGIN\u5373\u53ef\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n
\u6dfb\u52a0 connections[“database_name”].cursor().execute(“BEGIN”) \u5e76\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n
\u6211\u60f3\u7684\u4e8b\u60c5<\/h3>\n
\u9996\u5148\uff0c\u5373\u4f7f\u5728mysql\u4e2d\u5e94\u8be5\u53ef\u4ee5\u4f7f\u7528BEGIN\uff0c\u4f46\u6211\u4e0d\u77e5\u9053\u4e3a\u4ec0\u4e48\u5b83\u6ca1\u6709\u88ab\u6267\u884c\u3002
\n\u4f3c\u4e4e\u8fd8\u6709\u5176\u4ed6\u6b63\u786e\u7684\u89e3\u51b3\u529e\u6cd5……<\/p>\n","protected":false},"excerpt":{"rendered":"
\u7d50\u679c \u5728\u4ee5\u4e0b\u7684\u4ee3\u7801\u4e2d\uff0c\u5373\u4f7f\u5728MySQL\u4e2d\u4e5f\u53ef\u4ee5\u4f7f\u7528transaction.atomic()\u6765\u9501\u5b9a\u8bb0\u5f55\u3002 fro […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-49351","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nDjango + MySQL: \u5f53\u4f7f\u7528 transaction.atomic() \u548c select_for_update() \u9501\u5b9a\u8bb0\u5f55\u65f6\u7684\u7b14\u8bb0 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/django-mysql-\u5f53\u4f7f\u7528-transaction-atomic-\u548c-select_for_update-\u9501\u5b9a\u8bb0\u5f55\u65f6\u7684\u7b14\u8bb0\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Django + MySQL: \u5f53\u4f7f\u7528 transaction.atomic() \u548c select_for_update() \u9501\u5b9a\u8bb0\u5f55\u65f6\u7684\u7b14\u8bb0\" \/>\n<meta property=\"og:description\" content=\"\u7d50\u679c \u5728\u4ee5\u4e0b\u7684\u4ee3\u7801\u4e2d\uff0c\u5373\u4f7f\u5728MySQL\u4e2d\u4e5f\u53ef\u4ee5\u4f7f\u7528transaction.atomic()\u6765\u9501\u5b9a\u8bb0\u5f55\u3002 fro […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/django-mysql-\u5f53\u4f7f\u7528-transaction-atomic-\u548c-select_for_update-\u9501\u5b9a\u8bb0\u5f55\u65f6\u7684\u7b14\u8bb0\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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