Django模型如何与非Django文件交互

import csv
from myapp.models import MyModel

def import_csv(file_path):
    with open(file_path, 'r') as csvfile:
        reader = csv.DictReader(csvfile)
        for row in reader:
            MyModel.objects.create(
                field1=row['field1'],
                field2=row['field2'],
                # 其他字段...
            )

import json
from myapp.models import MyModel

def export_to_json(file_path):
    data = list(MyModel.objects.values())
    with open(file_path, 'w') as jsonfile:
        json.dump(data, jsonfile, indent=4)

import json
from myapp.models import MyModel

def update_from_json(file_path):
    with open(file_path, 'r') as jsonfile:
        data = json.load(jsonfile)
        for item in data:
            MyModel.objects.update_or_create(
                id=item['id'],
                defaults={
                    'field1': item['field1'],
                    'field2': item['field2'],
                    # 其他字段...
                }
            )

import os

if not os.path.exists(file_path):
    raise FileNotFoundError(f"The file {file_path} does not exist.")

def validate_and_convert_data(row):
    try:
        # 数据验证和转换逻辑
        return {
            'field1': int(row['field1']),
            'field2': row['field2'],
            # 其他字段...
        }
    except (KeyError, ValueError) as e:
        raise ValueError(f"Invalid data format: {e}")

from django.db import transaction

@transaction.atomic
def bulk_create_from_csv(file_path):
    with open(file_path, 'r') as csvfile:
        reader = csv.DictReader(csvfile)
        objs = [MyModel(**validate_and_convert_data(row)) for row in reader]
        MyModel.objects.bulk_create(objs)