Question

我正在编写一个代理爬虫，它将数据存储在sqlite数据库中，我更喜欢用cur.execute("insert into test(p) values (?)", (p,))之类的语句保存一个复杂的对象。然后我找到了一份有用的官方文件here
官方文件中的例子非常有效但是我遇到了一个问题我将官方代码更改为：

import sqlite3
import time

class Proxy:
    def __init__(self,ip,port,speed,area,level,active,last_check_time):
        self.ip = ip
        self.port = port
        self.speed = speed
        self.area = area
        self.level = level
        self.active = active
        self.last_check_time = last_check_time
    def __repr__(self):
        return '%s;%s;%s;%s;%s;%d;%d' % (self.ip,self.port,self.speed,self.area,self.level,self.active,self.last_check_time)



def adapt_proxy(proxy):
    return '%s;%s;%s;%s;%s;%d;%d' % (proxy.ip,proxy.port,proxy.speed,proxy.area,proxy.level,proxy.active,proxy.last_check_time)

def convert_proxy(s):
    ip,port,speed,area,level,active,last_check_time = map(str, s.split(";"))
    return Proxy(ip,port,speed,area,level,int(active),int(last_check_time))


# Register the adapter
sqlite3.register_adapter(Proxy, adapt_proxy)

# Register the converter
sqlite3.register_converter("proxy", convert_proxy)

p = Proxy('231', '123', '2424','444','555',1,int(time.time()))

#########################
# 1) Using declared types
con = sqlite3.connect(":memory:", detect_types=sqlite3.PARSE_DECLTYPES)
cur = con.cursor()
cur.execute("create table test(p proxy)")

cur.execute("insert into test(p) values (?)", (p,))
cur.execute("select p from test")
print "with declared types:", cur.fetchone()[0]
cur.close()
con.close()

#######################
# 1) Using column names
con = sqlite3.connect(":memory:", detect_types=sqlite3.PARSE_COLNAMES)
cur = con.cursor()
cur.execute("create table test(p)")

cur.execute("insert into test(p) values (?)", (p,))
cur.execute('select p as "p [proxy]" from test')
print "with column names:", cur.fetchone()[0]
cur.close()
con.close()

发生

错误：

Traceback (most recent call last):

  File "C:\Users\kss\Desktop\py\ts1.py", line 52, in <module>
    cur.execute("insert into test(p) values (?)", (p,))
sqlite3.InterfaceError: Error binding parameter 0 - probably unsupported type.
[Finished in 0.1s with exit code 1]

真的很奇怪。我想不出来了

Answer 1

将您的代理声明更改为：

class Proxy(object):
    # all the stuff before

问题是你的班级不是“新风格”班级;继承自object使其成为一个。

注意documentation的说法：

要适应的类型/类必须是新式类，i。即它必须有对象作为其基础之一。

sqlite3.InterfaceError：绑定参数0时出错 - 可能是不支持的类型

1 个答案: