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orm.py
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orm.py
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import db
import time
import logging
class Field(object):
count=0
def __init__(self,**kw):
self.name=kw.get('name',None)
self.primary_key=kw.get('primary_key',False)
self.nullable=kw.get('nullable',False)
self.updatable=kw.get('updatable',True)
self.insertable=kw.get('insertable',True)
self._default=kw.get('default',None)
self.ddl=kw.get('ddl',None)
self.order=Field.count
Field.count=Field.count+1
@property
def default(self):
d=self._default
return d() if callable(d) else d
class StringField(Field):
def __init__(self,**kw):
if not 'default' in kw:
kw['default']=''
if not 'ddl' in kw:
kw['ddl']="varchar(255)"
super(StringField,self).__init__(**kw)
class InterField(Field):
def __init__(self,**kw):
if not 'default' in kw:
kw['default']=0
if not 'ddl' in kw:
kw['ddl']='bigint'
super(InterField,self).__init__(**kw)
class BoolField(Field):
def __init__(self,**kw):
if not 'default' in kw:
kw['default'] = False
if not 'ddl' in kw:
kw['ddl']='bool'
super(BoolField,self).__init__(**kw)
class FloatField(Field):
def __init__(self,**kw):
if not 'default' in kw:
kw['default'] =0.0
if not 'ddl' in kw:
kw['ddl']='real'
super(FloatField,self).__init__(**kw)
class TextField(Field):
def __init__(self,**kw):
if not 'default' in kw:
kw['default']=''
if not 'ddl' in kw:
kw['ddl'] = 'text'
super(TextField,self).__init__(**kw)
class VersionField(Field):
def __init__(self,name=None):
super(VersionField,self).__init__(name=name,default=0,ddl='bigint')
def _gen_sql(table_name,mapping):
L=[]
pk=None
sql="create table %s (" %table_name
for f in sorted(mapping.values(),lambda x,y:cmp(x.order,y.order)):
if f.primary_key:
pk=f.name
if not f.ddl:
raise 'no ddl'
if f.nullable:
L.append("%s %s" %(f.name,f.ddl))
else:
L.append("%s %s not null" %(f.name,f.ddl))
L.append("primary key(%s)" %pk)
sql=sql+','.join(L)+');'
return sql
_tragger=frozenset(["pre_insert","pre_delete","pre_upate"])
class MetaClass(type):
def __new__(cls,name,bases,attrs):
primary_key=None
args=[]
mapping={}
if name == "Model":
return type.__new__(cls,name,bases,attrs)
if not hasattr(cls,"subclass"):
cls.subclass={}
if name not in cls.subclass:
cls.subclass[name]=name
for k,v in attrs.iteritems():
if isinstance(v,Field):
if v.name is None:
v.name=k
if v.primary_key:
if not primary_key:
primary_key=v
else:
raise "has been exsit primary key"
if v.nullable:
logging.warning("the primary key must be not null")
v.nullable=False
if v.updatable:
logging.warning("the primary key must be not update")
v.updatable=False
mapping[v.name]=v
args.append(k)
if not primary_key:
raise 'table has not primary key!'
#delete the Model subclass attribute that extends from Field
for k in args:
attrs.pop(k)
if not '__table__' in attrs:
attrs['__table__']=name.lower()
attrs['__mapping__']=mapping
attrs['__pri_key__']=primary_key
attrs['__sql__']=_gen_sql(attrs['__table__'],mapping)
for tragger in _tragger:
if not hasattr(cls,tragger):
attrs[tragger]=None
return type.__new__(cls,name,bases,attrs)
class Model(dict):
__metaclass__=MetaClass
def __init__(self,**kw):
super(Model,self).__init__(**kw)
def __getattr__(self,name):
if not name in self:
raise 'not attribute !!'
return self[name]
def __setattr__(self,name,value):
self[name]=value
@classmethod
def get(cls,key):
sql="select * from %s where %s='?' " %(cls.__table__,cls.__pri_key__.name)
d=db.select_one(sql,key)
return cls(**d) if d else None
def update(self):
sql="update %s set %s where %s=?"
L=[]
args=[]
pk=self.__pri_key__.name
for k,v in self.__mapping__.iteritems():
if v.updatable:
if hasattr(self,v.name):
L.append("%s=?" %v.name)
args.append(self[k])
else:
setattr(self,v.name,v.default)
L.append("%s=?" %k)
args.append(getattr(self,k))
args.append(self[pk])
sql=sql %(self.__table__,','.join(L),pk)
db.update(sql,*args)
def insert(self):
L=[]
args={}
for k,v in self.__mapping__.iteritems():
if v.insertable:
if not hasattr(self,k):
setattr(self,k,v.default)
args[k]=getattr(self,k)
db.insert_table(self.__table__,**args)
def delete(self):
pk=self.__pri_key__.name
if pk is None:
raise 'no pri_key vaules'
kid=getattr(self,pk)
sql="delete from %s where %s=? " %(self.__table__,pk)
print sql
kid=(kid,)
db.update(sql,*kid)
return self
if __name__ == '__main__':
db.create_engine('hu','hu','hu','127.0.0.1',3306)
maps=dict(id=StringField(primary_key=True,nullable=True,ddl='varchar(50)'),name=StringField(ddl='varchar(50)'),create_at=FloatField(updatable=False))
table_name='users'
print _gen_sql(table_name,maps)