def read_data(self, table_name, field=None, **kw):
"""
一个简易的数据读取接口
:param table_name:
:param field:
:param kw:
:return:
"""
try:
cursor = BaseModel(table_name, self.location,
self.dbname).query(kw, field)
data = pd.DataFrame()
if cursor.count():
data = pd.DataFrame(list(cursor))
except Exception as e:
ExceptionInfo(e)
finally:
cursor.close()
return data
def min(self, table_name, field='_id', **kw):
"""
找到满足kw条件的field列上的最小值
:param table_name:
:param field:
:param kw:
:return:
"""
try:
if not isinstance(field, str):
raise TypeError('field must be an instance of str')
cursor = BaseModel(table_name, self.location,
self.dbname).query(sql=kw, field={field: True})
if cursor.count():
d = pd.DataFrame(list(cursor))
m = d.loc[:, [field]].min()[field]
else:
m = None
cursor.close()
return m
except Exception as e:
raise e
