{"id":49762,"date":"2024-01-04T21:56:49","date_gmt":"2023-03-22T00:12:11","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8%ef%bc%9adjango-mysql\/"},"modified":"2024-05-04T16:53:03","modified_gmt":"2024-05-04T08:53:03","slug":"%e4%bd%bf%e7%94%a8%ef%bc%9adjango-mysql","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8%ef%bc%9adjango-mysql\/","title":{"rendered":"\u4f7f\u7528\uff1aDjango-MySQL"},"content":{"rendered":"<p>\u8fd9\u7bc7\u6587\u7ae0\u662f\u5728Django Advent Calendar 2019\u7684\u7b2c\u4e94\u5929\u53d1\u8868\u7684\u3002<\/p>\n<h1>\u9996\u5148<\/h1>\n<p>\u5728Django\u7684ORM\u4e2d\uff0c\u901a\u8fc7\u5229\u7528select_related\u3001prefetch_related\u3001Prefetch\u3001Q\u5bf9\u8c61\u7b49\u529f\u80fd\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u8f7b\u677e\u53d1\u51fa\u8db3\u591f\u4f18\u5316\u7684\u67e5\u8be2\u3002<\/p>\n<p>\u7136\u800c\uff0c\u4e5f\u6709\u4e00\u4e9b\u4e0d\u80fd\u505a\u5230\u7684\u4e8b\u60c5\uff0c\u6709\u65f6\u5019\u9700\u8981\u7f16\u5199\u539f\u751fSQL\u3002\u6bd4\u5982\uff0c\u5f53\u6709\u591a\u4e2a\u7d22\u5f15\u65f6\uff0c\u53ef\u4ee5\u6307\u5b9a\u8981\u4f7f\u7528\u7684\u7d22\u5f15\uff0c\u4f7f\u7528 USE_INDEX\uff0c\u6216\u8005\u6307\u5b9a\u4e0d\u4f7f\u7528\u7684\u7d22\u5f15\uff0c\u4f7f\u7528 IGNORE_INDEX\u7b49\u7b49\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u7f16\u5199\u539f\u751fSQL\u3002<\/p>\n<h1>Django-MySQL\uff1a\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\uff0c\u5728\u4e2d\u6587\u4e2d\u7ed9\u51fa\u4ee5\u4e0b\u7684\u91ca\u4e49\uff1a<\/h1>\n<ul class=\"post-ul\">Django-MySQL<\/ul>\n<p>\u7136\u800c\uff0c\u901a\u8fc7\u4f7f\u7528Django-MySQL\uff0c\u53ef\u4ee5\u6269\u5c55Django\u7684ORM\u800c\u4e0d\u9700\u8981\u7f16\u5199\u751fSQL\uff0c\u5e76\u80fd\u591f\u53d1\u51fa\u8bf8\u5982USE_INDEX\u6216IGNORE_INDEX\u4e4b\u7c7b\u7684\u67e5\u8be2\u3002<\/p>\n<h1>\u8bbe\u7f6e<\/h1>\n<h3>\u5b89\u88c5<\/h3>\n<pre class=\"post-pre\"><code>pip install django-mysql\r\n<\/code><\/pre>\n<h3>\u7f16\u8f91settings.py<\/h3>\n<h4>\u5c06django-mysql\u6dfb\u52a0\u5230INSTALLED_APPS\u4e2d\u3002<\/h4>\n<pre class=\"post-pre\"><code>\r\n<span class=\"n\">INSTALLED_APPS<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"s\">\"django.contrib.admin\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"s\">\"django.contrib.auth\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">...<\/span>\r\n    <span class=\"p\">...<\/span>\r\n    <span class=\"s\">\"django_mysql\"<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<h4>\u542f\u7528DJANGO_MYSQL_REWRITE_QUERIES<\/h4>\n<pre class=\"post-pre\"><code>\r\n<span class=\"n\">DJANGO_MYSQL_REWRITE_QUERIES<\/span> <span class=\"o\">=<\/span> <span class=\"bp\">True<\/span>\r\n<\/code><\/pre>\n<h4>sql_mode \u548c innodb_strict_mode \u7684\u914d\u7f6e<\/h4>\n<pre class=\"post-pre\"><code><span class=\"n\">DATABASES<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"s\">\"default\"<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"s\">\"ENGINE\"<\/span><span class=\"p\">:<\/span> <span class=\"s\">\"django.db.backends.mysql\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"s\">\"HOST\"<\/span><span class=\"p\">:<\/span> <span class=\"s\">\"127.0.0.1\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"s\">\"NAME\"<\/span><span class=\"p\">:<\/span> <span class=\"s\">\"hogehoge\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"s\">\"USER\"<\/span><span class=\"p\">:<\/span> <span class=\"s\">\"fugafuga\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"s\">\"OPTIONS\"<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"s\">\"charset\"<\/span><span class=\"p\">:<\/span> <span class=\"s\">\"utf8mb4\"<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"s\">\"init_command\"<\/span><span class=\"p\">:<\/span> <span class=\"s\">\"SET sql_mode='STRICT_TRANS_TABLES', innodb_strict_mode=1\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">},<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u542f\u7528\u4e86STRICT\u6a21\u5f0f\uff0c\u5c1d\u8bd5\u63d2\u5165\/\u66f4\u65b0\u8d85\u8fc7\u6700\u5927\u957f\u5ea6\u7684\u6570\u636e\u5c06\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002\u5982\u679c\u6ca1\u6709\u542f\u7528STRICT\u6a21\u5f0f\uff0c\u63d2\u5165\/\u66f4\u65b0\u8d85\u8fc7\u6700\u5927\u957f\u5ea6\u7684\u6570\u636e\u5c06\u4f1a\u88ab\u622a\u65ad\u5e76\u8fdb\u884c\u5904\u7406\uff0c\u4e0d\u4f1a\u5f15\u53d1\u9519\u8bef\u3002\u56e0\u6b64\uff0c\u5982\u679c\u5728\u8fdb\u884c\u6570\u636e\u9a8c\u8bc1\u65f6\u6ca1\u6709\u505a\u597d\u76f8\u5e94\u7684\u5904\u7406\uff0c\u5219\u9700\u8981\u6ce8\u610f\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u8fd9\u4e2a\u66f4\u6539\u6d89\u53ca\u5230\u4eceDjango\u8fde\u63a5\u5230MySQL\u65f6\u7684\u8bbe\u7f6e\uff0c\u56e0\u6b64\u4e0d\u9700\u8981\u91cd\u65b0\u8fdb\u884c\u8fc1\u79fb\u6216\u5176\u4ed6\u7c7b\u4f3c\u64cd\u4f5c\u3002<\/p>\n<h1>\u8ba9\u6211\u4eec\u8bd5\u4e00\u8bd5<\/h1>\n<h3>\u6a21\u578b\u7684\u8bbe\u7f6e<\/h3>\n<p>\u7528\u6237\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3ahoge\u7684\u6a21\u578b\u3002\u5728fuga\u548cpiyo\u4e24\u4e2a\u5b57\u6bb5\u4e0a\u90fd\u6dfb\u52a0\u4e86\u7d22\u5f15\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">from<\/span> <span class=\"nn\">django.db<\/span> <span class=\"kn\">import<\/span> <span class=\"n\">models<\/span>\r\n<span class=\"kn\">from<\/span> <span class=\"nn\">django_mysql.models<\/span> <span class=\"kn\">import<\/span> <span class=\"n\">QuerySet<\/span>\r\n\r\n\r\n<span class=\"k\">class<\/span> <span class=\"nc\">Hoge<\/span><span class=\"p\">(<\/span><span class=\"n\">models<\/span><span class=\"p\">.<\/span><span class=\"n\">Model<\/span><span class=\"p\">):<\/span>\r\n    <span class=\"n\">fuga<\/span> <span class=\"o\">=<\/span> <span class=\"n\">models<\/span><span class=\"p\">.<\/span><span class=\"n\">IntegerField<\/span><span class=\"p\">(<\/span><span class=\"n\">db_index<\/span><span class=\"o\">=<\/span><span class=\"bp\">True<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">piyo<\/span> <span class=\"o\">=<\/span> <span class=\"n\">models<\/span><span class=\"p\">.<\/span><span class=\"n\">IntegerField<\/span><span class=\"p\">(<\/span><span class=\"n\">db_index<\/span><span class=\"o\">=<\/span><span class=\"bp\">True<\/span><span class=\"p\">)<\/span>\r\n\r\n    <span class=\"n\">objects<\/span> <span class=\"o\">=<\/span> <span class=\"n\">QuerySet<\/span><span class=\"p\">.<\/span><span class=\"n\">as_manager<\/span><span class=\"p\">()<\/span>\r\n<\/code><\/pre>\n<p>\u4e0e\u901a\u5e38\u4e0d\u540c\u7684\u4e00\u70b9\u662f\u4f7f\u7528from django_mysql.models import QuerySet\uff0c\u5e76\u5c06\u5176\u7528\u4e8eORM\u7684\u7ba1\u7406\u5668\u3002<br \/>\n\u901a\u8fc7\u8fd9\u6837\u505a\uff0c\u53ef\u4ee5\u4f7f\u7528Django-MySQL\u6269\u5c55\u6765\u6267\u884c\u67e5\u8be2\u3002<\/p>\n<h3>\u5236\u4f5c\u7684\u684c\u5b50\u7684\u4fe1\u606f<\/h3>\n<pre class=\"post-pre\"><code>mysql&gt; show index from users_hoge;\r\n+------------+------------+--------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+\r\n| Table      | Non_unique | Key_name                 | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |\r\n+------------+------------+--------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+\r\n| users_hoge |          0 | PRIMARY                  |            1 | id          | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |\r\n| users_hoge |          1 | users_hoge_fuga_8a4fba19 |            1 | fuga        | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |\r\n| users_hoge |          1 | users_hoge_piyo_4539c423 |            1 | piyo        | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |\r\n+------------+------------+--------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+\r\n<\/code><\/pre>\n<p>\u5c31\u662f\u8fd9\u4e2a\u611f\u89c9\u3002<\/p>\n<h3>\u5c1d\u8bd5\u5ffd\u7565\u7d22\u5f15\u3002<\/h3>\n<p>\u5982\u679c\u4e0d\u4f7f\u7528fuga\u7684\u7d22\u5f15\u8fdb\u884c\u67e5\u8be2\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">Hoge<\/span><span class=\"p\">.<\/span><span class=\"n\">objects<\/span><span class=\"p\">.<\/span><span class=\"nb\">all<\/span><span class=\"p\">().<\/span><span class=\"n\">ignore_index<\/span><span class=\"p\">(<\/span><span class=\"s\">\"users_hoge_fuga_8a4fba19\"<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u8fd9\u4e2a\u64cd\u4f5c\u751f\u6210\u7684SQL\u5982\u4e0b<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span>\r\n  <span class=\"nv\">`users_hoge`<\/span><span class=\"p\">.<\/span><span class=\"nv\">`id`<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"nv\">`users_hoge`<\/span><span class=\"p\">.<\/span><span class=\"nv\">`fuga`<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"nv\">`users_hoge`<\/span><span class=\"p\">.<\/span><span class=\"nv\">`piyo`<\/span>\r\n<span class=\"k\">FROM<\/span>\r\n  <span class=\"nv\">`users_hoge`<\/span> <span class=\"k\">IGNORE<\/span> <span class=\"k\">INDEX<\/span><span class=\"p\">(<\/span><span class=\"nv\">`users_hoge_fuga_8a4fba19`<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u6b63\u786e\u5730\u5ffd\u7565\u7d22\u5f15\u5df2\u7ecf\u53d1\u884c\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u5982\u679c\u5c1d\u8bd5\u5728\u4e0d\u4f7f\u7528Django-MySQL\u7684\u60c5\u51b5\u4e0b\u5b8c\u6210\u8fd9\u4e2a\u4efb\u52a1\u7684\u8bdd<\/p>\n<pre class=\"post-pre\"><code>AttributeError: 'QuerySet' object has no attribute 'ignore_index'\r\n<\/code><\/pre>\n<p>\u8fd9\u6837\u4f1a\u51fa\u9519\u3002<\/p>\n<h1>\u7ed3\u675f<\/h1>\n<p>\u76ee\u524d\uff0c\u6211\u53ea\u4f7f\u7528\u8fc7IGNORE INDEX\uff0c\u4f46\u8fd8\u6709\u5176\u4ed6\u4e00\u4e9b\u6709\u7528\u7684\u529f\u80fd\uff0c\u6bd4\u5982force index\uff0c\u4f60\u53ef\u4ee5\u9605\u8bfb\u6587\u6863\u4e86\u89e3\u66f4\u591a\u8be6\u7ec6\u4fe1\u606f\u3002<br \/>\n\u5728\u901a\u5e38\u7684ORM\u4e2d\uff0c\u5982\u679c\u51fa\u73b0\u65e0\u6cd5\u5b9e\u73b0\u7684\u60c5\u51b5\uff0c\u53ef\u80fd\u9700\u8981\u901a\u8fc7\u7f16\u5199SQL\u6765\u89e3\u51b3\uff0c\u8fd9\u65f6\u8003\u8651\u5f15\u5165Djnago-MySQL\u53ef\u80fd\u662f\u4e00\u4e2a\u597d\u7684\u9009\u62e9\u3002<\/p>\n<h1>\u6211\u60f3\u8ac7\u4e00\u4e0b\u5176\u4ed6\u7684\u4e8b\u60c5\u3002<\/h1>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d8d57913a08637a6d2efd\/39-0.png\" alt=\"image.png\" \/><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u7bc7\u6587\u7ae0\u662f\u5728Django Advent Calendar 2019\u7684\u7b2c\u4e94\u5929\u53d1\u8868\u7684\u3002 \u9996\u5148 \u5728Django\u7684OR [&hellip;]<\/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-49762","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u4f7f\u7528\uff1aDjango-MySQL - 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\/\u4f7f\u7528\uff1adjango-mysql\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4f7f\u7528\uff1aDjango-MySQL\" \/>\n<meta property=\"og:description\" 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