\n| Sequence \u5e8f\u5217\u751f\u6210\u5668<\/td>\n | \u4e0d\u652f\u6301<\/td>\n | \u652f\u6301<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\u4e09\u79cd\u65b9\u6848\u6bd4\u8f83<\/h2>\n\u53cc\u5199\u65b9\u6848\uff1a\u540c\u65f6\u5f80mysql\u548ctidb\u5199\u5165\u6570\u636e\uff0c\u4e24\u4e2a\u6570\u636e\u5e93\u6570\u636e\u5b8c\u5168\u4fdd\u6301\u540c\u6b65<\/p>\n \u2022\u4f18\u70b9\uff1a\u6b64\u65b9\u6848\u6700\u5b89\u5168\uff0c\u4f5c\u4e3a\u515c\u5e95\u65b9\u6848\u4e0d\u9700\u62c5\u5fc3\u6570\u636e\u5e93\u56de\u6eda\u95ee\u9898\uff0c\u56e0\u4e3a\u6570\u636e\u5b8c\u5168\u4e00\u81f4\uff0c\u53ef\u4ee5\u65e0\u7f1d\u56de\u6eda\u5230mysql<\/p>\n \u2022\u7f3a\u70b9\uff1a\u65b0\u65b9\u6848\uff0c\u8c03\u7814\u65b9\u6848\u5b9e\u73b0\uff0c\u6210\u672c\u8f83\u9ad8<\/p>\n \u8bfb\u5199\u5206\u79bb\uff1a\u6570\u636e\u5199\u5165mysql\uff0c\u4ecetidb\u8bfb\uff0c\u5177\u4f53\u65b9\u6848\u662f\u5207\u6362\u5230\u7ebf\u4e0a\u4ee5\u540e\uff0c\u4fdd\u6301\u8bfb\u5199\u5206\u79bb\u4e00\u5468\u65f6\u95f4\u5de6\u53f3\uff0c\u8fd9\u4e00\u5468\u65f6\u95f4\u7528\u6765\u786e\u5b9atidb\u6570\u636e\u5e93\u6ca1\u6709\u95ee\u9898\uff0c\u518d\u628a\u5199\u64cd\u4f5c\u4e5f\u5207\u6362\u5230tidb<\/p>\n \u2022\u4f18\u70b9: \u5207\u6362\u8fc7\u7a0b\uff0cmysql\u548ctidb\u6570\u636e\u4fdd\u6301\u540c\u6b65\uff0c\u6ee1\u8db3\u6570\u636e\u56de\u6eda\u5230mysql\u65b9\u6848<\/p>\n \u2022\u7f3a\u70b9\uff1amysql\u548ctidb\u6570\u636e\u5e93\u540c\u6b65\u5b58\u5728\u5ef6\u65f6\uff0c\u5bf9\u90e8\u5206\u5199\u5165\u6570\u636e\u8981\u6c42\u5b9e\u65f6\u67e5\u8be2\u7684\u4f1a\u5bfc\u81f4\u67e5\u8be2\u5931\u8d25\uff0c\u540c\u65f6\u4e00\u65e6\u6574\u4f53\u5207\u6362\u5230tidb\uff0c\u65e0\u6cd5\u56de\u5207\u5230mysql<\/p>\n \u76f4\u63a5\u5207\u6362\uff1a\u76f4\u63a5\u4e00\u6b65\u5207\u6362\u5230tidb<\/p>\n \u2022\u4f18\u70b9\uff1a\u5207\u6362\u8fc7\u7a0b\u6700\u7b80\u5355\uff0c\u6210\u672c\u6700\u4f4e<\/p>\n \u2022\u7f3a\u70b9\uff1a\u6b64\u65b9\u6848\u6ca1\u6709\u515c\u5e95\u65b9\u6848\uff0c\u5207\u6362\u5230tidb\uff0c\u65e0\u6cd5\u518d\u56de\u5207\u5230mysql\u6216\u8005\u540c\u6b65\u6570\u636e\u56demysql\u98ce\u9669\u8f83\u5927\uff0c\u65e0\u6cd5\u4fdd\u8bc1\u6570\u636e\u662f\u5426\u53ef\u7528<\/p>\n Django\u53cc\u5199mysql\u4e0etidb\u7b56\u7565<\/h2>\nsettings.py\u4e2d\u65b0\u589e\u914d\u7f6e<\/code><\/pre>\n\n# Dev Database settings\nDATABASES = {\n 'default': {\n 'ENGINE': 'django.db.backends.mysql',\n 'NAME': 'name',\n 'USER': 'root',\n 'PASSWORD': '123456',\n 'HOST': 'db',\n },\n 'replica': {\n 'ENGINE': 'django.db.backends.mysql',\n 'NAME': 'name',\n 'USER': 'root',\n 'PASSWORD': '123456',\n 'HOST': 'db',\n },\n 'bak': {\n 'ENGINE': 'django.db.backends.mysql',\n 'NAME': 'name',\n 'USER': 'root',\n 'PASSWORD': '123456',\n 'HOST': 'db',\n },\n}\n# \u591a\u91cd\u5199\u5165\u6570\u636e\u5e93\u914d\u7f6e\nMULTI_WRITE_DB = "bak"<\/code><\/pre>\n\u53cc\u5199\u4e2d\u95f4\u4ef6 basemodel.py<\/p>\n import copy\nimport logging\nimport traceback\nfrom django.db import models, transaction, router\nfrom django.db.models.deletion import Collector\nfrom django.db.models import sql\nfrom django.db.models.sql.constants import CURSOR\nfrom jcdp.settings import MULTI_WRITE_DB, DATABASES\n\nmulti_write_db = MULTI_WRITE_DB\n\n\n# \u91cd\u5199QuerySet\nclass BaseQuerySet(models.QuerySet):\n\n def create(self, **kwargs):\n return super().create(**kwargs)\n\n def update(self, **kwargs):\n try:\n rows = super().update(**kwargs)\n if multi_write_db in DATABASES:\n self._for_write = True\n query = self.query.chain(sql.UpdateQuery)\n query.add_update_values(kwargs)\n with transaction.mark_for_rollback_on_error(using=multi_write_db):\n query.get_compiler(multi_write_db).execute_sql(CURSOR)\n except Exception:\n logging.error(traceback.format_exc())\n raise\n return rows\n\n def delete(self):\n try:\n deleted, _rows_count = super().delete()\n if multi_write_db in DATABASES:\n del_query = self._chain()\n del_query._for_write = True\n del_query.query.select_for_update = False\n del_query.query.select_related = False\n collector = Collector(using=multi_write_db)\n collector.collect(del_query)\n collector.delete()\n except Exception:\n logging.error(traceback.format_exc())\n raise\n return deleted, _rows_count\n\n def raw(self, raw_query, params=None, translations=None, using=None):\n try:\n qs = super().raw(raw_query, params=params, translations=translations, using=using)\n if multi_write_db in DATABASES:\n super().raw(raw_query, params=params, translations=translations, using=multi_write_db)\n except Exception:\n logging.error(traceback.format_exc())\n raise\n return qs\n\n def bulk_create(self, objs, batch_size=None, ignore_conflicts=False):\n try:\n for obj in objs:\n obj.save()\n except Exception:\n logging.error(traceback.format_exc())\n raise\n # objs = super().bulk_create(objs, batch_size=batch_size, ignore_conflicts=ignore_conflicts)\n # if multi_write_db in DATABASES:\n # self._db = multi_write_db\n # super().bulk_create(objs, batch_size=batch_size, ignore_conflicts=ignore_conflicts)\n return objs\n\n def bulk_update(self, objs, fields, batch_size=None):\n try:\n super().bulk_update(objs, fields, batch_size=batch_size)\n if multi_write_db in DATABASES:\n self._db = multi_write_db\n super().bulk_update(objs, fields, batch_size=batch_size)\n except Exception:\n logging.error(traceback.format_exc())\n raise\n\n\nclass BaseManager(models.Manager):\n _queryset_class = BaseQuerySet\n\n\nclass BaseModel(models.Model):\n objects = BaseManager()\n\n class Meta:\n abstract = True\n\n def delete(\n self, using=None, *args, **kwargs\n ):\n try:\n instance = copy.deepcopy(self)\n super().delete(using=using, *args, **kwargs)\n if multi_write_db in DATABASES:\n super(BaseModel, instance).delete(using=multi_write_db, *args, **kwargs)\n except Exception:\n logging.error(traceback.format_exc())\n raise\n\n def save_base(self, raw=False, force_insert=False,\n force_update=False, using=None, update_fields=None):\n try:\n using = using or router.db_for_write(self.__class__, instance=self)\n assert not (force_insert and (force_update or update_fields))\n assert update_fields is None or update_fields\n cls = self.__class__\n # Skip proxies, but keep the origin as the proxy model.\n if cls._meta.proxy:\n cls = cls._meta.concrete_model\n meta = cls._meta\n # A transaction isn't needed if one query is issued.\n if meta.parents:\n context_manager = transaction.atomic(using=using, savepoint=False)\n else:\n context_manager = transaction.mark_for_rollback_on_error(using=using)\n with context_manager:\n parent_inserted = False\n if not raw:\n parent_inserted = self._save_parents(cls, using, update_fields)\n self._save_table(\n raw, cls, force_insert or parent_inserted,\n force_update, using, update_fields,\n )\n if multi_write_db in DATABASES:\n super().save_base(raw=raw,\n force_insert=raw,\n force_update=force_update,\n using=multi_write_db,\n update_fields=update_fields)\n # Store the database on which the object was saved\n self._state.db = using\n # Once saved, this is no longer a to-be-added instance.\n self._state.adding = False\n except Exception:\n logging.error(traceback.format_exc())\n raise<\/code><\/pre>\n\u4e0a\u8ff0\u914d\u7f6e\u5b8c\u6210\u4ee5\u540e\uff0c\u5728\u6bcf\u4e2a\u5e94\u7528\u7684models.py\u4e2d\u5f15\u7528\u65b0\u7684BaseModel\u7c7b\u4f5c\u4e3a\u6a21\u578b\u57fa\u7c7b\u5373\u53ef\u5b9e\u73b0\u53cc\u5199\u76ee\u7684<\/p>\n class DirectoryStructure(BaseModel):\n """\n \u76ee\u5f55\u7ed3\u6784\n """\n view = models.CharField(max_length=128, db_index=True) # \u89c6\u56fe\u540d\u79f0 eg\uff1a\u90e8\u95e8\u89c6\u56fe \u9879\u76ee\u89c6\u56fe\n sub_view = models.CharField(max_length=128, unique=True, db_index=True) # \u5b50\u89c6\u56fe\u540d\u79f0\n sub_view_num = models.IntegerField() # \u5b50\u89c6\u56fe\u987a\u5e8f\u53f7<\/code><\/pre>\n\u6ce8\uff1a\u76ee\u524d\u8be5\u65b9\u6cd5\u5c1a\u4e0d\u652f\u6301\u591a\u5bf9\u591a\u6a21\u578b\u7684\u53cc\u5199\u60c5\u666f\uff0c\u5982\u6709\u4e1a\u52a1\u9700\u6c42\uff0c\u8fd8\u9700\u91cd\u5199ManyToManyField\u7c7b\uff0c\u65b9\u6cd5\u53c2\u8003\u7334\u5b50\u8865\u4e01\u65b9\u5f0f<\/p>\n \u8fc1\u79fb\u6570\u636e\u5e93\u8fc7\u7a0b\u8e29\u5751\u8bb0\u5f55<\/p>\n TIDB\u914d\u7f6e\u9879\u5dee\u5f02\uff1a\u786e\u8ba4\u6570\u636e\u5e93\u914d\u7f6e\uff1aONLY_FULL_GROUP_BY \u7981\u7528 \uff08mysql\u9ed8\u8ba4\u7981\u7528\uff09<\/p>\n TIDB\u4e0d\u652f\u6301\u4e8b\u52a1savepoint\uff0c\u4ee3\u7801\u4e2d\u9700\u8981\u663e\u5f0f\u5173\u95edsavepoint=False<\/p>\n TIDB\u7531\u4e8e\u662f\u5206\u5e03\u5f0f\u6570\u636e\u5e93\uff0c\u5bf9\u4e8e\u81ea\u589e\u4e3b\u952e\u5b57\u6bb5\u7684\u81ea\u589e\u7b56\u7565\u4e0emysq\u6709\u5dee\u5f02\uff0c\u82e5\u4e1a\u52a1\u4ee3\u7801\u4f1a\u4e0e\u4e3b\u952eid\u5173\u8054\uff0c\u9700\u8981\u6ce8\u610f\u3002<\/p>\n https:\/\/segmentfault.com\/a\/1190000043180448<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"\u4f5c\u8005\uff1a\u4eac\u4e1c\u96f6\u552e \u77f3\u78ca TiDB \u4f5c\u4e3a\u5f00\u6e90 NewSQL \u6570\u636e\u5e93\u7684\u5178\u578b\u4ee3\u8868\u4e4b\u4e00\uff0c\u540c\u6837\u652f\u6301 SQL\uff0c\u652f\u6301\u4e8b\u52a1 AC […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10007020","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10007020","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10007020"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10007020\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10007020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10007020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10007020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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