存档：
1 # -*- coding: utf-8 -*- 2 class Field(object): 3 4 def __init__(self, name, column_type): 5 self.name = name 6 self.column_type = column_type 7 8 def __str__(self): 9 return '<%s:%s>' % (self.__class__.__name__, self.name) 10 class StringField(Field): 11 12 def __init__(self, name): 13 super(StringField, self).__init__(name, 'varchar(100)') 14 15 class IntegerField(Field): 16 17 def __init__(self, name): 18 super(IntegerField, self).__init__(name, 'bigint') 19 class ModelMetaclass(type): 20 21 def __new__(cls, name, bases, attrs): 22 if name=='Model': 23 return type.__new__(cls, name, bases, attrs) 24 print('Found model: %s' % name) 25 mappings = dict() 26 for k, v in attrs.items(): 27 if isinstance(v, Field): 28 print('Found mapping: %s ==> %s' % (k, v)) 29 mappings[k] = v 30 for k in mappings.keys(): 31 attrs.pop(k) 32 attrs['__mappings__'] = mappings # 保存属性和列的映射关系 33 attrs['__table__'] = name #;">Michael', email='test@orm.org', password='my-pwd') 68 # 保存到数据库： 69 u.save()
结果如下：
Found model: User
Found mapping: id ==> <IntegerField:id>
Found mapping: name ==> <StringField:username>
Found mapping: email ==> <StringField:email>
Found mapping: password ==> <StringField:password>
SQL: insert into User (id,username,email,password) values (?,?,?,?)
ARGS: [12345, 'Michael', 'test@orm.org', 'my-pwd']
[Finished in 0.2s]
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