{"id":6161,"date":"2022-04-05T18:42:19","date_gmt":"2022-04-05T10:42:19","guid":{"rendered":"https:\/\/egonlin.com\/?p=6161"},"modified":"2022-04-16T19:39:06","modified_gmt":"2022-04-16T11:39:06","slug":"%e7%ac%ac%e5%8d%81%e4%ba%8c%e8%8a%82%ef%bc%9adjango%e4%b8%adorm%e5%bc%80%e5%90%af%e4%ba%8b%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=6161","title":{"rendered":"\u7b2c\u5341\u4e8c\u8282\uff1adjango\u4e2dORM\u5f00\u542f\u4e8b\u52a1"},"content":{"rendered":"

django\u4e2dORM\u5f00\u542f\u4e8b\u52a1<\/h1>\n

\"\"<\/div><\/p>\n

\u4e00\u3001\u5168\u5c40\u5f00\u542f<\/h2>\n

ATOMIC_REQUESTS\u8bbe\u7f6e\u4e3aTrue\uff0c\u6bcf\u4e2a\u8bf7\u6c42\u8fc7\u6765\u65f6\uff0cDjango\u4f1a\u5728\u8c03\u7528\u89c6\u56fe\u65b9\u6cd5\u524d\u5f00\u542f\u4e00\u4e2a\u4e8b\u52a1\u3002\u5982\u679c\u8bf7\u6c42\u6b63\u786e\u5904\u7406\u5e76\u6b63\u786e\u8fd4\u56de\u4e86\u7ed3\u679c\uff0cDjango\u5c31\u4f1a\u63d0\u4ea4\u8be5\u4e8b\u52a1\uff0c\u5426\u5219\uff0cDjango\u4f1a\u56de\u6eda\u8be5\u4e8b\u52a1\u3002<\/p>\n

DATABASES = {\n    'default': {\n        'ENGINE': 'django.db.backends.mysql',\n        'NAME': 'mxshop',\n        'HOST': '127.0.0.1',\n        'PORT': '3306',\n        'USER': 'root',\n        'PASSWORD': '123',\n        'OPTIONS': {\n            "init_command": "SET default_storage_engine='INNODB'",\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000#'init_command': "SET sql_mode='STRICT_TRANS_TABLES'", #\u914d\u7f6e\u5f00\u542f\u4e25\u683csql\u6a21\u5f0f\n        }\n        "ATOMIC_REQUESTS": True, #\u5168\u5c40\u5f00\u542f\u4e8b\u52a1\uff0c\u7ed1\u5b9a\u7684\u662fhttp\u8bf7\u6c42\u54cd\u5e94\u6574\u4e2a\u8fc7\u7a0b\n        "AUTOCOMMIT":False, #\u5168\u5c40\u53d6\u6d88\u81ea\u52a8\u63d0\u4ea4\uff0c\u614e\u7528\n    }\uff0c\n\u3000\u3000'other':{\n\u3000\u3000\u3000\u3000'ENGINE': 'django.db.backends.mysql', \n            ......\n\u3000\u3000}  # \u8fd8\u53ef\u4ee5\u914d\u7f6e\u5176\u4ed6\u6570\u636e<\/code><\/pre>\n
\u5bf9\u90e8\u5206\u89c6\u56fe\u51fd\u6570\u53d6\u6d88\u4e8b\u52a1<\/p>\n
from django.db import transaction\n\n@transaction.non_atomic_requests\ndef my_view(request):\n    do_stuff()\n\n@transaction.non_atomic_requests(using='other')\ndef my_other_view(request):\n    do_stuff_on_the_other_database()<\/code><\/pre>\n
\u5f3a\u8c03\uff1a<\/p>\n
Django\u5b98\u65b9\u6587\u6863\u4e2d\u63d0\u5230\uff0c\u4e0d\u63a8\u8350\u5f00\u542f\u5168\u5c40\u4e8b\u52a1\u3002\u56e0\u4e3a\u6bcf\u4e2aHTTP \u8bf7\u6c42\u90fd\u4f1a\u6346\u7ed1\u4e00\u4e2a\u4e8b\u52a1\uff0c\u5f53\u6d41\u91cf\u4e0a\u6765\u7684\u65f6\u5019\uff0c\u6027\u80fd\u4f1a\u6709\u5f71\u54cd\u3002<\/p>\n
\u4e8c\u3001\u5c40\u90e8\u5f00\u542f<\/h2>\n
\u4f7f\u7528transaction.atomic(using=None, savepoint=True)\uff0catomic\u5373\u539f\u5b50\u6027\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u7528\u8be5\u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u5177\u5907\u539f\u5b50\u6027\u7684\u4ee3\u7801\u5757\u3002\u4e00\u65e6\u4ee3\u7801\u5757\u6b63\u5e38\u8fd0\u884c\u5b8c\u6bd5\uff0c\u6240\u6709\u7684\u4fee\u6539\u4f1a\u88ab\u63d0\u4ea4\u5230\u6570\u636e\u5e93\u3002\u53cd\u4e4b\uff0c\u5982\u679c\u6709\u5f02\u5e38\uff0c\u66f4\u6539\u4f1a\u88ab\u56de\u6eda\u3002<\/p>\n
\u53c2\u6570<\/p>\n
using=’other’,’other’\u5bf9\u5e94\u7684\u662fsettings.py\u4e2d\u914d\u7f6e\u9879DATABASES\u6240\u6307\u5b9a\u7684\u67d0\u4e2a\u5f15\u64ce\uff0c\u610f\u601d\u662f\u5f53\u4f60\u4f7f\u7528other\u5bf9\u5e94\u7684\u5f15\u64ce\u7684\u65f6\uff0c\u8fd9\u4e2a\u4e8b\u52a1\u624d\u751f\u6548\u3002
\n<\/em>savepoint\u7684\u610f\u601d\u662f\u5f00\u542f\u4e8b\u52a1\u4fdd\u5b58\u70b9\u3002<\/p>\n
*\u7528\u6cd51\uff1a\u4f5c\u4e3a\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u6765\u4f7f\u7528*<\/em><\/strong><\/p>\n
from django.db import transaction\n\nwith transaction.atomisc():\n    # sql1\n    # sql2\n    # sql3\n    # \u5728with\u4ee3\u7801\u5757\u5185\u5199\u7684\u6240\u6709orm\u64cd\u4f5c\u90fd\u662f\u5c5e\u4e8e\u540c\u4e00\u4e2a\u4e8b\u52a1<\/code><\/pre>\n
\u4e0a\u8ff0\u7528\u6cd5\u53ef\u4ee5\u5199\u5728\u4e00\u4e2a\u89c6\u56fe\u51fd\u6570\u91cc<\/p>\n
from django.db import transaction\n\ndef viewfunc(request):\n    # This code executes in autocommit mode (Django's default).\n    do_stuff()\n\n    with transaction.atomic():   #\u4fdd\u5b58\u70b9\n        # This code executes inside a transaction.\n        do_more_stuff()\n\n    do_other_stuff()<\/code><\/pre>\n
*\u7528\u6cd52\uff1a\u7ed9\u89c6\u56fe\u51fd\u6570\u88c5\u9970\u5668*<\/em><\/strong><\/p>\n
from django.db import transaction\n\n@transaction.atomic\ndef post(self,request):\n    ...\n    sid=transaction.savepoint()  #\u5f00\u542f\u4e8b\u52a1\n    ...\n    transaction.savepoint_rollback(sid)  # \u56de\u6eda\n    ...\n    transaction.savepoint_commit(sid)  # \u63d0\u4ea4<\/code><\/pre>\n
\u4e5f\u53ef\u4ee5\u8fdb\u884c\u5f02\u5e38\u5904\u7406<\/p>\n
from django.db import IntegrityError, transaction\n\n@transaction.atomic\ndef viewfunc(request):\n    create_parent()\n\n    try:\n        with transaction.atomic():\n            generate_relationships()\n    except IntegrityError:\n        handle_exception()\n\n    add_children()<\/code><\/pre>\n
*\u7528\u6cd53\uff1a\u8fd8\u53ef\u4ee5\u5d4c\u5957\u4f7f\u7528*<\/em><\/strong><\/p>\n
\u51fd\u6570\u7684\u4e8b\u52a1\u5d4c\u5957\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7684\u4e8b\u52a1\uff0c\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7684\u4e8b\u52a1\u5d4c\u5957\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7684\u4e8b\u52a1\u7b49<\/p>\n
from django.db import IntegrityError, transaction\n\n@transaction.atomic\ndef viewfunc(request):\n    create_parent()\n\n    try:\n        with transaction.atomic():\n            generate_relationships()\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000# other_task()  #\u8fd8\u8981\u6ce8\u610f\u4e00\u70b9\uff0c\u5982\u679c\u4f60\u5728\u4e8b\u52a1\u91cc\u9762\u5199\u4e86\u522b\u7684\u64cd\u4f5c\uff0c\u53ea\u6709\u8fd9\u4e9b\u64cd\u4f5c\u5168\u90e8\u5b8c\u6210\u4e4b\u540e\uff0c\u4e8b\u52a1\u624d\u4f1acommit\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u4f60\u8fd9\u4e2a\u4efb\u52a1\u662f\u67e5\u8be2\u4e0a\u9762\u66f4\u6539\u7684\u6570\u636e\u8868\u91cc\u9762\u7684\u6570\u636e\uff0c\u90a3\u4e48\u770b\u5230\u7684\u8fd8\u662f\u4e8b\u52a1\u63d0\u4ea4\u4e4b\u524d\u7684\u6570\u636e\u3002\n    except IntegrityError:\n        handle_exception()\n\n    add_children()<\/code><\/pre>\n
\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\uff0c\u5373\u4f7fgenerate_relationships()\u4e2d\u7684\u4ee3\u7801\u6253\u7834\u4e86\u6570\u636e\u5b8c\u6574\u6027\u7ea6\u675f\uff0c\u4f60\u4ecd\u7136\u53ef\u4ee5\u5728add_children()\u4e2d\u6267\u884c\u6570\u636e\u5e93\u64cd\u4f5c\uff0c\u5e76\u4e14create_parent()\u4ea7\u751f\u7684\u66f4\u6539\u4e5f\u6709\u6548\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u8c03\u7528handle_exception()\u4e4b\u524d\uff0cgenerate_relationships()\u4e2d\u7684\u4fee\u6539\u5c31\u5df2\u7ecf\u88ab\u5b89\u5168\u7684\u56de\u6eda\u4e86\u3002\u56e0\u6b64\uff0c\u5982\u679c\u6709\u9700\u8981\uff0c\u4f60\u7167\u6837\u53ef\u4ee5\u5728\u5f02\u5e38\u5904\u7406\u51fd\u6570\u4e2d\u64cd\u4f5c\u6570\u636e\u5e93\u3002<\/p>\n
\u5f3a\u8c03\uff1a\u5c3d\u91cf\u4e0d\u8981\u5728atomic\u4ee3\u7801\u5757\u4e2d\u6355\u83b7\u5f02\u5e38\uff0c\u539f\u56e0\u5982\u4e0b<\/p>\n
\u56e0\u4e3a\u5f53atomic\u5757\u4e2d\u7684\u4ee3\u7801\u6267\u884c\u5b8c\u7684\u65f6\u5019\uff0cDjango\u4f1a\u6839\u636e\u4ee3\u7801\u6b63\u5e38\u8fd0\u884c\u6765\u6267\u884c\u76f8\u5e94\u7684\u63d0\u4ea4\u6216\u8005\u56de\u6eda\u64cd\u4f5c\u3002\u5982\u679c\u5728atomic\u4ee3\u7801\u5757\u91cc\u9762\u6355\u6349\u5e76\u5904\u7406\u4e86\u5f02\u5e38\uff0c\u5c31\u6709\u53ef\u80fd\u9690\u76d6\u4ee3\u7801\u672c\u8eab\u7684\u9519\u8bef\uff0c\u4ece\u800c\u53ef\u80fd\u4f1a\u6709\u4e00\u4e9b\u610f\u6599\u4e4b\u5916\u7684\u4e0d\u6109\u5feb\u4e8b\u60c5\u53d1\u751f\u3002<\/p>\n
\u62c5\u5fc3\u4e3b\u8981\u96c6\u4e2d\u5728DatabaseError\u548c\u5b83\u7684\u5b50\u7c7b\uff08\u5982IntegrityError\uff09\u3002\u5982\u679c\u8fd9\u79cd\u5f02\u5e38\u771f\u7684\u53d1\u751f\u4e86\uff0c\u4e8b\u52a1\u5c31\u4f1a\u88ab\u7834\u574f\u6389\uff0c\u800cDjango\u4f1a\u5728\u4ee3\u7801\u8fd0\u884c\u5b8c\u540e\u6267\u884c\u56de\u6eda\u64cd\u4f5c\u3002\u5982\u679c\u4f60\u8bd5\u56fe\u5728\u56de\u6eda\u524d\u6267\u884c\u4e00\u4e9b\u6570\u636e\u5e93\u64cd\u4f5c\uff0cDjango\u4f1a\u629b\u51faTransactionManagementError\u3002\u901a\u5e38\u4f60\u4f1a\u5728\u4e00\u4e2aORM\u76f8\u5173\u7684\u4fe1\u53f7\u5904\u7406\u5668\u629b\u51fa\u5f02\u5e38\u65f6\u9047\u5230\u8fd9\u4e2a\u884c\u4e3a\u3002<\/p>\n
\u6355\u83b7\u5f02\u5e38\u7684\u6b63\u786e\u65b9\u5f0f\u6b63\u5982\u4e0a\u9762atomic\u4ee3\u7801\u5757\u6240\u793a\u3002\u5982\u679c\u6709\u5fc5\u8981\uff0c\u6dfb\u52a0\u989d\u5916\u7684atomic\u4ee3\u7801\u5757\u6765\u505a\u8fd9\u4ef6\u4e8b\u60c5\uff0c\u4e5f\u5c31\u662f\u4e8b\u52a1\u5d4c\u5957\u3002\u8fd9\u4e48\u505a\u7684\u597d\u5904\u662f\uff1a\u5f53\u5f02\u5e38\u53d1\u751f\u65f6\uff0c\u5b83\u80fd\u660e\u786e\u5730\u544a\u8bc9\u4f60\u90a3\u4e9b\u64cd\u4f5c\u9700\u8981\u56de\u6eda\uff0c\u800c\u90a3\u4e9b\u662f\u4e0d\u9700\u8981\u7684\u3002<\/p>\n
\u4e3a\u4e86\u4fdd\u8bc1\u539f\u5b50\u6027\uff0catomic\u8fd8\u7981\u6b62\u4e86\u4e00\u4e9bAPI\u3002\u50cf\u8bd5\u56fe\u63d0\u4ea4\u3001\u56de\u6eda\u4e8b\u52a1\uff0c\u4ee5\u53ca\u6539\u53d8\u6570\u636e\u5e93\u8fde\u63a5\u7684\u81ea\u52a8\u63d0\u4ea4\u72b6\u6001\u8fd9\u4e9b\u64cd\u4f5c\uff0c\u5728atomic\u4ee3\u7801\u5757\u4e2d\u90fd\u662f\u4e0d\u4e88\u8bb8\u7684\uff0c\u5426\u5219\u5c31\u4f1a\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n
\u4e0b\u9762\u662fDjango\u7684\u4e8b\u52a1\u7ba1\u7406\u4ee3\u7801\uff1a<\/p>\n
\u2022 \u8fdb\u5165\u6700\u5916\u5c42atomic\u4ee3\u7801\u5757\u65f6\u5f00\u542f\u4e00\u4e2a\u4e8b\u52a1\uff1b<\/p>\n
\u2022 \u8fdb\u5165\u5185\u90e8atomic\u4ee3\u7801\u5757\u65f6\u521b\u5efa\u4fdd\u5b58\u70b9\uff1b<\/p>\n
\u2022 \u9000\u51fa\u5185\u90e8atomic\u65f6\u91ca\u653e\u6216\u56de\u6eda\u4e8b\u52a1\uff1b\u6ce8\u610f\u5982\u679c\u6709\u5d4c\u5957\uff0c\u5185\u5c42\u7684\u4e8b\u52a1\u4e5f\u662f\u4e0d\u4f1a\u63d0\u4ea4\u7684\uff0c\u53ef\u4ee5\u91ca\u653e\uff08\u6b63\u5e38\u7ed3\u675f\uff09\u6216\u8005\u56de\u6eda<\/p>\n
\u2022 \u9000\u51fa\u6700\u5916\u5c42atomic\u4ee3\u7801\u5757\u65f6\u63d0\u4ea4\u6216\u8005\u56de\u6eda\u4e8b\u52a1\uff1b<\/p>\n
\u4f60\u53ef\u4ee5\u5c06\u4fdd\u5b58\u70b9\u53c2\u6570\u8bbe\u7f6e\u6210False\u6765\u7981\u6b62\u5185\u90e8\u4ee3\u7801\u5757\u521b\u5efa\u4fdd\u5b58\u70b9\u3002\u5982\u679c\u53d1\u751f\u4e86\u5f02\u5e38\uff0cDjango\u5728\u9000\u51fa\u7b2c\u4e00\u4e2a\u7236\u5757\u7684\u65f6\u5019\u6267\u884c\u56de\u6eda\uff0c\u5982\u679c\u5b58\u5728\u4fdd\u5b58\u70b9\uff0c\u5c06\u56de\u6eda\u5230\u8fd9\u4e2a\u4fdd\u5b58\u70b9\u7684\u4f4d\u7f6e\uff0c\u5426\u5219\u5c31\u662f\u56de\u6eda\u5230\u6700\u5916\u5c42\u7684\u4ee3\u7801\u5757\u3002\u5916\u5c42\u4e8b\u52a1\u4ecd\u7136\u80fd\u591f\u4fdd\u8bc1\u539f\u5b50\u6027\u3002\u7136\u800c\uff0c\u8fd9\u4e2a\u9009\u9879\u5e94\u8be5\u4ec5\u4ec5\u7528\u4e8e\u4fdd\u5b58\u70b9\u5f00\u9500\u8f83\u5927\u7684\u65f6\u5019\u3002\u6bd5\u7adf\u5b83\u6709\u4e2a\u7f3a\u70b9\uff1a\u4f1a\u7834\u574f\u4e0a\u6587\u63cf\u8ff0\u7684\u9519\u8bef\u5904\u7406\u673a\u5236\u3002<\/p>\n
\u6ce8\u610f\uff1atransaction\u53ea\u5bf9\u6570\u636e\u5e93\u5c42\u7684\u64cd\u4f5c\u8fdb\u884c\u4e8b\u52a1\u7ba1\u7406,\u4e0d\u80fd\u7406\u89e3\u4e3apython\u64cd\u4f5c\u7684\u4e8b\u52a1\u7ba1\u7406<\/p>\n
def example_view(request):\n    tag = False\n    with transaction.atomic():\n        tag = True\n        change_obj() # \u4fee\u6539\u5bf9\u8c61\u53d8\u91cf\n        obj.save()\n        raise DataError\n    print("tag = ",tag) #\u7ed3\u679c\u662fTrue\uff0c\u4e5f\u5c31\u662f\u8bf4\u5728\u4e8b\u52a1\u4e2d\u7684python\u53d8\u91cf\u8d4b\u503c\uff0c\u5373\u4fbf\u662f\u4e8b\u52a1\u56de\u6eda\u4e86\uff0c\u8fd9\u4e2a\u8d4b\u503c\u4e5f\u662f\u6210\u529f\u7684<\/code><\/pre>\n
\u8fd8\u8981\u6ce8\u610f\uff1a\u5982\u679c\u4f60\u914d\u7f6e\u4e86\u5168\u5c40\u7684\u4e8b\u52a1\uff0c\u5b83\u548c\u5c40\u90e8\u4e8b\u52a1\u53ef\u80fd\u4f1a\u4ea7\u751f\u51b2\u7a81\uff0c\u4f60\u53ef\u80fd\u4f1a\u53d1\u73b0\u4f60\u5c40\u90e8\u7684\u4e8b\u52a1\u5b8c\u6210\u4e4b\u540e\uff0c\u5982\u679c\u4f60\u7684\u51fd\u6570\u91cc\u9762\u5176\u4ed6\u7684sql\u9664\u4e86\u95ee\u9898\uff0c\u4e5f\u5c31\u662f\u6ca1\u5728\u8fd9\u4e2a\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7684\u5c40\u90e8\u4e8b\u52a1\u5305\u88f9\u8303\u56f4\u5185\u7684\u51fd\u6570\u91cc\u9762\u7684\u5176\u4ed6\u7684sql\u51fa\u73b0\u4e86\u95ee\u9898\uff0c\u4f60\u7684\u5c40\u90e8\u4e8b\u52a1\u4e5f\u662f\u63d0\u4ea4\u4e0d\u4e0a\u7684\uff0c\u56e0\u4e3a\u5168\u5c40\u4f1a\u56de\u6eda\u8fd9\u4e2a\u8bf7\u6c42\u548c\u54cd\u5e94\u6240\u6d89\u53ca\u5230\u7684\u6240\u6709\u7684sql\uff0c\u6240\u4ee5\u8fd8\u662f\u5efa\u8bae\u4ee5\u540e\u7684\u9879\u76ee\u5c3d\u91cf\u4e0d\u8981\u914d\u7f6e\u5168\u5c40\u7684\u4e8b\u52a1\uff0c\u901a\u8fc7\u5c40\u90e8\u4e8b\u52a1\u6765\u641e\u5b9a\uff0c\u5f53\u7136\u4e86\uff0c\u770b\u4f60\u4eec\u7684\u4e1a\u52a1\u573a\u666f\u3002<\/p>\n
transaction\u7684\u5176\u4ed6\u65b9\u6cd5<\/p>\n
@transaction.atomic\ndef viewfunc(request):\n\n  a.save()\n  # open transaction now contains a.save()\n  sid = transaction.savepoint()  #\u521b\u5efa\u4fdd\u5b58\u70b9\n\n  b.save()\n  # open transaction now contains a.save() and b.save()\n\n  if want_to_keep_b:\n      transaction.savepoint_commit(sid) #\u63d0\u4ea4\u4fdd\u5b58\u70b9\n      # open transaction still contains a.save() and b.save()\n  else:\n      transaction.savepoint_rollback(sid)  #\u56de\u6eda\u4fdd\u5b58\u70b9\n      # open transaction now contains only a.save()\n\n  transaction.commit() #\u624b\u52a8\u63d0\u4ea4\u4e8b\u52a1\uff0c\u9ed8\u8ba4\u662f\u81ea\u52a8\u63d0\u4ea4\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u5982\u679c\u4f60\u6ca1\u6709\u8bbe\u7f6e\u53d6\u6d88\u81ea\u52a8\u63d0\u4ea4\uff0c\u90a3\u4e48\u8fd9\u53e5\u8bdd\u4e0d\u7528\u5199\uff0c\u5982\u679c\u4f60\u914d\u7f6e\u4e86\u90a3\u4e2aAUTOCOMMIT=False\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u81ea\u5df1\u624b\u52a8\u8fdb\u884c\u63d0\u4ea4\u3002<\/code><\/pre>\n
\u4e3a\u4fdd\u8bc1\u4e8b\u52a1\u7684\u9694\u79bb\u6027\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u7ed3\u5408\u4e0a\u9762\u7684\u9501\u6765\u5b9e\u73b0\uff0c\u4e5f\u5c31\u662f\u8bf4\u5728\u4e8b\u52a1\u91cc\u9762\u7684\u67e5\u8be2\u8bed\u53e5\uff0c\u54b1\u4eec\u4f7f\u7528select_for_update\u663e\u793a\u7684\u52a0\u9501\u65b9\u5f0f\u6765\u4fdd\u8bc1\u9694\u79bb\u6027\uff0c\u4e8b\u52a1\u7ed3\u675f\u540e\u624d\u4f1a\u91ca\u653e\u8fd9\u4e2a\u9501\uff0c\u4f8b\u5982\uff1a\uff08\u4e86\u89e3\uff09<\/p>\n
@transaction.atomic ## \u8f7b\u677e\u5f00\u542f\u4e8b\u52a1\ndef handle(self):\n    ## \u6d4b\u8bd5\u662f\u5426\u5b58\u5728\u6b64\u7528\u6237\n    try:\n        ## \u9501\u5b9a\u88ab\u67e5\u8be2\u884c\u76f4\u5230\u4e8b\u52a1\u7ed3\u675f\n        user = \n    User.objects.select_for_update().get(open_id=self.user.open_id)\n        #other sql \u8bed\u53e5\n    except User.DoesNotExist:\n        raise BaseError(-1, 'User does not exist.')<\/code><\/pre>\n
\u901a\u8fc7Django\u5916\u90e8\u7684python\u811a\u672c\u6765\u6d4b\u8bd5\u4e00\u4e0b\u4e8b\u52a1\uff1a<\/p>\n
import os\n\nif __name__ == '__main__':\n    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "BMS.settings")\n    import django\n    django.setup()\n\n    import datetime\n    from app01 import models\n\n    try:\n        from django.db import transaction\n        with transaction.atomic():\n            new_publisher = models.Publisher.objects.create(name="\u706b\u661f\u51fa\u7248\u793e")\n            models.Book.objects.create(title="\u6a58\u5b50\u7269\u8bed", publish_date=datetime.date.today(), publisher_id=10)  # \u6307\u5b9a\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u51fa\u7248\u793eid\n    except Exception as e:\n        print(str(e))<\/code><\/pre>\n
\u66f4\u591a\u6570\u636e\u5e93\u4e8b\u52a1\u77e5\u8bc6\u8be6\u89c1\u672c\u4e66\u7b2c\u5341\u4e09\u7ae0 \u6570\u636e\u5e93\u9ad8\u7ea7<\/p>\n","protected":false},"excerpt":{"rendered":"
django\u4e2dORM\u5f00\u542f\u4e8b\u52a1 \u4e00\u3001\u5168\u5c40\u5f00\u542f ATOMIC_REQUESTS\u8bbe\u7f6e\u4e3aTrue\uff0c\u6bcf\u4e2a\u8bf7\u6c42\u8fc7\u6765\u65f6\uff0cDj […]<\/p>\n","protected":false},"author":3,"featured_media":6780,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,405],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/6161"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6161"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/6161\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/6780"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6161"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6161"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}