Question

这是我调用的代码（一切都很好，除了插入的最后一行）所有必需的导入都在那里工作。查询一定有问题。

db = Database()
soup = bs(mytrades)

for row in soup.findAll("tr"):
    cols = row.findAll("td")
    data = []
    for col in cols:
        data.append(col.text)

        query = """INSERT INTO zulutrades VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s), (128391,"""+data[0]+""","""+data[1]+""","""+data[2]+""","""+data[3]+""","""+data[4]+""","""+data[5]+""","""+data[6]+""","""+data[7]+""","""+data[8]+""","""+data[9]+""","""+data[10]+""")"""       
        db.insert(query)

* “错误”（我没有发布，因为我认为这意味着不多）*

Exception in thread Thread-192 (most likely raised during interpreter shutdown):Exception in thread Thread-2 (most likely raised during interpreter shutdown):
Traceback (most recent call last):

File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
File "/usr/lib/python2.7/threading.py", line 763, in run
File "/usr/local/lib/python2.7/dist-packages/windmill-1.6-py2.7.egg/windmill/server/https.py", line 401, in start
File "/usr/lib/python2.7/SocketServer.py", line 280, in handle_request
File "/usr/lib/python2.7/SocketServer.py", line 291, in _handle_request_noblock
<type 'exceptions.AttributeError'>: 'NoneType' object has no attribute 'error'
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
File "/usr/lib/python2.7/threading.py", line 763, in run
File "/usr/lib/python2.7/SocketServer.py", line 597, in process_request_thread
File "/usr/lib/python2.7/SocketServer.py", line 471, in shutdown_request
<type 'exceptions.AttributeError'>: 'NoneType' object has no attribute 'error'

我正在使用以下mysql数据库类：

class Database:

    host = 'localhost'
    user = 'wind'
    password = 'mill'
    db = 'windmill'

    def __init__(self):
        self.connection = MySQLdb.connect(self.host, self.user, self.password, self.db)
        self.cursor = self.connection.cursor()

    def insert(self, query):
        try:
            self.cursor.execute(query)
            self.connection.commit()
        except:
            self.connection.rollback()



    def query(self, query):
        cursor = self.connection.cursor( MySQLdb.cursors.DictCursor )
        cursor.execute(query)

        return cursor.fetchall()

    def __del__(self):
        self.connection.close()

这是mysql表

CREATE TABLE IF NOT EXISTS `zulutrades` (
`id` int(10) NOT NULL,
`currency` varchar(8) NOT NULL,
`type` varchar(8) NOT NULL,
`std_lots` int(8) NOT NULL,
`date_open` varchar(20) NOT NULL,
`date_closed` varchar(20) NOT NULL,
`open_close` varchar(20) NOT NULL,
`high` float NOT NULL,
`low` float NOT NULL,
`roll` float NOT NULL,
`profit` varchar(10) NOT NULL,
`total` varchar(20) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Answer 1

query = """INSERT INTO zulutrades VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s), (128391,"""+data[0]+""","""+data[1]+""","""+data[2]+""","""+data[3]+""","""+data[4]+""","""+data[5]+""","""+data[6]+""","""+data[7]+""","""+data[8]+""","""+data[9]+""","""+data[10]+""")"""

在这里，您要为两个行构建INSERT查询（请注意VALUES子句后的两个带括号的组）;第一行仅包含12个占位符，而第二行由在查询字符串中直接连接的12个值组成。此查询不会成功，因为您永远不会在cursor.execute(query)方法的Database.query调用中为占位符提供值。

您需要重写Database.query和Database.insert方法，以支持将查询参数传递给cursor.execute方法：

class Database:
    ...

    def insert(self, query, params):
        try:
            self.cursor.execute(query, params)
            self.connection.commit()
        except:
            self.connection.rollback()

    def query(self, query, params):
        cursor = self.connection.cursor( MySQLdb.cursors.DictCursor )
        cursor.execute(query, params)

        return cursor.fetchall()

但是，你的循环也是错误的。您正在为INSERT返回的每个单元执行rows.findAll('td')查询，不为{返回的每个行执行soup.findAll('tr')查询{1}}。 INSERT应该发生在外部循环中，而不是内部：

query = 'INSERT INTO zulutrades VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)'
for row in soup.findAll("tr"):
    cols = row.findAll("td")
    data = []
    for col in cols:
        data.append(col.text)

    db.insert(query, [128391] + data)

如您所见，查询字符串本身不再需要在循环体内定义，因为它不再为您要插入的每一行更改 - 只有执行的参数现在更改，但这些参数作为一个提供将参数分隔为db.insert。

Python mysql数据库插入查询，线程错误

1 个答案: