多线程多进程使用sqlite有点麻烦 对速度和性能又没有要求很高
所以就用了一下xmlrpc
服务端
from xmlrpc.server import SimpleXMLRPCServer
from xmlrpc.server import SimpleXMLRPCRequestHandler
import sqlite3
def dict_factory(cursor, row):
d = {}
for idx, col in enumerate(cursor.description):
d[col[0]] = row[idx]
return d
class SQL():
def __init__(self):
self.__conn = sqlite3.connect("cash.db")
def query(self,sql,arg,size=0):
self.__conn.row_factory = dict_factory
cur= self.__conn.cursor()
cur.execute(sql,arg)
if size !=0:
rs = cur.fetchmany(size)
else:
rs = cur.fetchall()
self.__conn.commit()
return rs
def update(self,sql,arg):
self.__conn.row_factory = dict_factory
cur= self.__conn.cursor()
cur.execute(sql,arg)
result = cur.rowcount
self.__conn.commit()
return result
class RequestHandler(SimpleXMLRPCRequestHandler):
rpc_paths = ('/RPC2',)
if __name__ == '__main__':
with SimpleXMLRPCServer(('localhost', 8887),
requestHandler=RequestHandler,logRequests=True) as server:
server.register_introspection_functions()
server.register_instance(SQL())
server.serve_forever()
客户端
import xmlrpc.client
import time
import logging
class Db():
def __init__(self):
self.conn = xmlrpc.client.ServerProxy('http://localhost:8887')
def query(self,sql,args,size=0):
start = time.clock()
rs= self.conn.query(sql,args,size)
s = time.clock() - start
if s > 0.005:
logging.warning(f"SQL:{sql},args:{args},size:{size},run:{s}s")
return rs
def update(self,sql,args):
start = time.clock()
rs = self.conn.update(sql,args)
s =time.clock() - start
if s > 0.005:
logging.warning(f"SQL:{sql},args:{args},run:{s}s")
return rs
s = Db()
orm
import datetime
import logging
import time
import uuid
from utils.sqliteClient import s
def log(sql, args=()):
logging.info('SQL: %s' % sql)
class MyDb():
def __init__(self):
self.pool = s
def select(self,sql, args, size=0):
log(sql, args)
rs = self.pool.query(sql,args,size)
logging.info('rows returned: %s' % len(rs))
return rs
def execute(self,sql, args):
log(sql)
affected = 0
try:
affected = self.pool.update(sql,args)
except BaseException as e:
log(e)
return affected
db = MyDb()
def next_id():
return '%015d%s000' % (int(time.time() * 1000), uuid.uuid4().hex)
def create_args_string(num):
L = []
for n in range(num):
L.append('?')
return ', '.join(L)
class Field(object):
def __init__(self, name, column_type, primary_key, default):
self.name = name
self.column_type = column_type
self.primary_key = primary_key
self.default = default
def __str__(self):
return '<%s, %s:%s>' % (self.__class__.__name__, self.column_type, self.name)
class StringField(Field):
def __init__(self, name=None, primary_key=False, default=None, ddl='varchar(100)'):
super().__init__(name, ddl, primary_key, default)
class BooleanField(Field):
def __init__(self, name=None, default=False):
super().__init__(name, 'boolean', False, default)
class IntegerField(Field):
def __init__(self, name=None, primary_key=False, default=0):
super().__init__(name, 'bigint', primary_key, default)
class FloatField(Field):
def __init__(self, name=None, primary_key=False, default=0.0):
super().__init__(name, 'real', primary_key, default)
class TextField(Field):
def __init__(self, name=None, default=None):
super().__init__(name, 'text', False, default)
class DateTimeField(Field):
def __init__(self, name=None, default=None):
super().__init__(name, 'timestamp', False, default)
class ModelMetaclass(type):
def __new__(cls, name, bases, attrs):
if name=='Model':
return type.__new__(cls, name, bases, attrs)
tableName = attrs.get('__table__', None) or name
logging.info('found model: %s (table: %s)' % (name, tableName))
mappings = dict()
fields = []
primaryKey = None
for k, v in attrs.items():
if isinstance(v, Field):
logging.info(' found mapping: %s ==> %s' % (k, v))
mappings[k] = v
if v.primary_key:
# 找到主键:
if primaryKey:
raise AttributeError('Duplicate primary key for field: %s' % k)
primaryKey = k
else:
fields.append(k)
if not primaryKey:
raise AttributeError('Primary key not found.')
for k in mappings.keys():
attrs.pop(k)
escaped_fields = list(map(lambda f: '`%s`' % f, fields))
attrs['__mappings__'] = mappings # 保存属性和列的映射关系
attrs['__table__'] = tableName
attrs['__primary_key__'] = primaryKey # 主键属性名
attrs['__fields__'] = fields # 除主键外的属性名
attrs['__select__'] = 'select `%s`, %s from `%s`' % (primaryKey, ', '.join(escaped_fields), tableName)
attrs['__insert__'] = 'insert into `%s` (%s, `%s`) values (%s)' % (tableName, ', '.join(escaped_fields), primaryKey, create_args_string(len(escaped_fields) + 1))
attrs['__update__'] = 'update `%s` set %s where `%s`=?' % (tableName, ', '.join(map(lambda f: '`%s`=?' % (mappings.get(f).name or f), fields)), primaryKey)
attrs['__delete__'] = 'delete from `%s` where `%s`=?' % (tableName, primaryKey)
return type.__new__(cls, name, bases, attrs)
class Model(dict, metaclass=ModelMetaclass):
def __init__(self, **kw):
super(Model, self).__init__(**kw)
def __getattr__(self, key):
try:
return self[key]
except KeyError:
raise AttributeError(r"'Model' object has no attribute '%s'" % key)
def __setattr__(self, key, value):
self[key] = value
def getValue(self, key):
return getattr(self, key, None)
def getValueOrDefault(self, key):
value = getattr(self, key, None)
if value is None:
field = self.__mappings__[key]
if field.default is not None:
value = field.default() if callable(field.default) else field.default
logging.debug('using default value for %s: %s' % (key, str(value)))
setattr(self, key, value)
return value
@classmethod
def findAll(cls, where=None, args=None, **kw):
' find objects by where clause. '
sql = [cls.__select__]
if where:
sql.append('where')
sql.append(where)
if args is None:
args = []
orderBy = kw.get('orderBy', None)
if orderBy:
sql.append('order by')
sql.append(orderBy)
limit = kw.get('limit', None)
if limit is not None:
sql.append('limit')
if isinstance(limit, int):
sql.append('?')
args.append(limit)
elif isinstance(limit, tuple) and len(limit) == 2:
sql.append('?, ?')
args.extend(limit)
else:
raise ValueError('Invalid limit value: %s' % str(limit))
rs = db.select(' '.join(sql), args)
return [cls(**r) for r in rs]
@classmethod
def query(cls, sql=None, args=()):
rs = db.select(sql, args)
return [cls(**r) for r in rs]
@classmethod
def findNumber(cls, selectField, where=None, args=None):
' find number by select and where. '
sql = ['select %s _num_ from `%s`' % (selectField, cls.__table__)]
if where:
sql.append('where')
sql.append(where)
rs = db.select(' '.join(sql), args, 1)
if len(rs) == 0:
return None
return rs[0]['_num_']
@classmethod
def find(cls, pk):
' find object by primary key. '
rs = db.select('%s where `%s`=?' % (cls.__select__, cls.__primary_key__), [pk], 1)
if len(rs) == 0:
return None
return cls(**rs[0])
def save(self):
args = list(map(self.getValueOrDefault, self.__fields__))
args.append(self.getValueOrDefault(self.__primary_key__))
rows = db.execute(self.__insert__, args)
if rows != 1:
logging.error('failed to insert record: affected rows: %s' % rows)
def update(self):
args = list(map(self.getValue, self.__fields__))
args.append(self.getValue(self.__primary_key__))
rows = db.execute(self.__update__, args)
if rows != 1:
logging.error('failed to update by primary key: affected rows: %s' % rows)
def remove(self):
args = [self.getValue(self.__primary_key__)]
rows = db.execute(self.__delete__, args)
if rows != 1:
logging.error('failed to remove by primary key: affected rows: %s' % rows)
def timestamp_datetime(ts):
if isinstance(ts, (int, float, str)):
try:
ts = int(ts)
except ValueError:
raise
if len(str(ts)) == 13:
ts = int(ts / 1000)
if len(str(ts)) != 10:
raise ValueError
else:
raise ValueError()
return datetime.datetime.fromtimestamp(ts)
简单的测试
from utils.orm import Model,StringField,TextField,next_id,DateTimeField,IntegerField,timestamp_datetime
from datetime import datetime
class UserBean(Model):
__table__ = 'fish_users'
id = StringField(primary_key=True,default=next_id(),ddl="char(50)")
username = StringField(ddl="char(200)")
name = StringField(ddl="char(200)",default="")
passwd = StringField(ddl="char(200)")
create_date = DateTimeField(default=datetime.now().timestamp())
token = StringField(default="token")
last_login = DateTimeField(default=datetime.now().timestamp())
is_online = IntegerField(default=0)
还存在的问题
时间类型序列化还存在问题
是否语序None存在不稳定因素
但是已经可以凑活用了