peewee,如何查询指定的table?

peewee, how to query specified table?

我有 peewee 模型,它需要每天创建一个 table,不是我想查询 table MotorTable.query() Test20191021 但它总是查询 table今天如何查询指定的table?

DB = SqliteDatabase('test.db')
def motor_db_table(model_cls):
    return 'Test{}'.format(time.strftime('%Y%m%d'))

class MotorTable(Model):
    date = DateTimeField()
    addr = CharField()
    status = CharField()

    class Meta:
        database = DB
        table_function = motor_db_table

您可以通过多种方式解决此问题。您可以在闭包中创建模型 class,例如

model_cache = {}

def get_model_for_date(dt):
    tbl_name = 'Test' + dt.strftime('%Y%m%d')

    if tbl_name not in model_cache:
        class MotorTable(Model):
            date = DateTimeField()
            addr = TextField()
            status = CharField()
            class Meta:
                database = DB
                table_name = tbl_name
        if not MotorTable.table_exists():
            MotorTable.create_table()
        model_cache[tbl_name] = MotorTable

    return model_cache[tbl_name]

或者,您可以在每次使用包装器时显式设置 table 名称:

def get_model(dt):
    table_name = 'Test' + dt.strftime('%Y%m%d')
    MotorTable._meta.set_table_name(table_name)
    if not MotorTable.table_exists():
        MotorTable.create_table()
    return MotorTable