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[英]pandas dataframe to_sql for replace and add new using sqlalchemy
[英]pandas dataframe to mariadb database with to_sql and sqlalchemy
我想使用pandas函数to_sql将数据帧写入MariaDB数据库。 我在PyCharm中的Python代码如下所示:
import pandas as pd
import mysql.connector
from sqlalchemy import create_engine
myd = pd.read_csv('/[path]/[filename].csv')
engine = create_engine('mysql+mysqlconnector://[user]:[pw]@127.0.0.1/[dbname]')
myd.to_sql(name='[tablename]', con=engine, if_exists='replace', index=False)
在控制台中执行最后一行时,我收到以下错误:
Error on sql SELECT name FROM sqlite_master WHERE type='table' AND name='[tablename]';
Traceback (most recent call last):
File "/usr/lib/python3.4/code.py", line 90, in runcode
exec(code, self.locals)
File "<input>", line 1, in <module>
File "/usr/lib/python3/dist-packages/pandas/core/frame.py", line 1261, in to_sql
self, name, con, flavor=flavor, if_exists=if_exists, **kwargs)
File "/usr/lib/python3/dist-packages/pandas/io/sql.py", line 207, in write_frame
exists = table_exists(name, con, flavor)
File "/usr/lib/python3/dist-packages/pandas/io/sql.py", line 275, in table_exists
return len(tquery(query, con)) > 0
File "/usr/lib/python3/dist-packages/pandas/io/sql.py", line 90, in tquery
cur = execute(sql, con, cur=cur)
File "/usr/lib/python3/dist-packages/pandas/io/sql.py", line 44, in execute
cur = con.cursor()
AttributeError: 'Engine' object has no attribute 'cursor'
这里有人在某一点上有同样的错误。 然而,在有人解决问题之前,它已经消失了。 你知道什么是错的吗?
仅从pandas 0.14.0开始支持传递sqlalchemy引擎
要使用旧的pandas版本的to_sql
,您需要将原始连接( engine.raw_connection()
)和flavor='mysql'
传递给to_sql
:
myd.to_sql(name='[tablename]', con=engine.raw_connection(), flavor='mysql', if_exists='replace', index=False)
但是,我建议升级你的pandas版本(不推荐使用原始连接,在新的pandas版本中不再支持,那么只支持sqlalchemy引擎/连接)
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