Peewee ORM - 将多个数据库中的数据复制到一个主数据库中

Question

我想从多个数据库复制数据，处理它们，然后将它们移动到主数据库。所有数据库都具有相同的架构。

即使我打开和关闭数据库，peewee 总是连接到同一个数据库（列表中的第三个）并且不遵守连接顺序。

databases = [spie_db, opticsorg_db, phcom_db]


# map to a dictionary the values from the record
def mapping(record):
    comp_d = {'name': record.name,
              'address': record.address,
              'country': record.country,
              'website': record.website,
              'domain':  record.domain
              }
    return comp_d


def merge_data():
    company_list = []
    for database in databases:
        database.connect()
        # cycle trough db
        for record in Company.select():
            # append each record to the list
            company_list.append(mapping(record))
        database.close()
    return company_list


# get data from the other databases
companies = merge_data()
# the merge database
db.connect()
# add records in the merge db
for company in companies:

    Company.create(name=company['name'], address=company['address'], country=company['country'],
                   website=company['website'], domain=company['domain'])

db.close()

Answer 1

您需要在模型的 Meta 选项中手动设置数据库：

Company._meta.database = db
db.connect()
for company in companies:

    Company.create(name=company['name'], address=company['address'], country=company['country'],
                   website=company['website'], domain=company['domain'])