Prepare the data for the database. Each field’s get_db_prep_save() method is asked to provide its current value in a data type that can be written to the database. Most fields don’t require data preparation.
FieldDoesNotExist,FieldError,MultipleObjectsReturned,ObjectDoesNotExist,ValidationError,)fromdjango.dbimport(DEFAULT_DB_ALIAS,DJANGO_VERSION_PICKLE_KEY,DatabaseError,connections,router,
The migrations system should notice changes in thedb_defaultfield, and prepare a migration for it. There will be backend-specific strategies to implement migrations that change these fields. Database introspecting should understand column defaults, and if possible add them when creating models from ...
For the fromtend I want to prepare an accurate json. But I want to execute only one request to the database. Therefore from the database I'll extract a flat structure: Poll ID Poll name Candidate ID Candidate name 1 Election 1 Billy the Labourist 1 Election 2 John the Communist 1 ...
self.prepare_test_settings(alias) db = self.databases[alias] backend = load_backend(db['ENGINE']) # django.db.backends.mysql.base.DatabaseWrapper conn = backend.DatabaseWrapper(db, alias) setattr(self._connections, alias, conn) return conn ...
# Database # https://docs.djangoproject.com/en/2.0/ref/settings/#databases DATABASES = { 'default': { 'ENGINE': 'django.db.backends.mysql', 'NAME': 'user_name', 'HOST': '127.0.0.1', 'PORT': 3306, 'USER': 'root', 'PASSWORD': 'shamesha', ...
if form is not valid, initial_value copy from value and lost field from changed_data when send repaired form """ if self.form.is_bound: data = widget.value_from_datadict(self.form.data, self.form.files, self.html_initial_name) return self.field.prepare_value(data) else: return self....
prepare_test_settings(alias) db = self.databases[alias] # 使用mysql引擎 backend = load_backend(db['ENGINE']) conn = backend.DatabaseWrapper(db, alias) setattr(self._connections, alias, conn) return conn 代码块 预览 复制 复制成功!
self.prepare_test_settings(alias) db=self.databases[alias] backend=load_backend(db['ENGINE']) # 关键在这了,这个就是conn conn=backend.DatabaseWrapper(db,alias) # 放到 local里 setattr(self._connections,alias,conn) returnconn 这个代码的关键就是生成对于backend的conn,并且放到local中。backend.Databa...
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