2016-07-01 351 views
1

我想使用熊貓函數to_sql將數據框寫入MariaDB數據庫。裏面PyCharm我的Python代碼如下:pandas dataframe to mariadb數據庫to_sql和sqlalchemy

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) 

執行在控制檯中我得到以下錯誤的最後一行時:

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' 

Here有人在一個點有同樣的錯誤。但是,在某人解決問題之前,它已經消失了。你知道什麼是錯的嗎?

+0

通常情況下,如果您使用的是舊熊貓版本(在支持sqlalchemy引擎之前),則可能會出現此錯誤。你能顯示「pd .__ version__」的輸出嗎? – joris

+0

這給出0.13.1 - 我需要更新熊貓,對吧? – nluckn

+0

的確,最低版本爲0.14。否則,你可以傳遞原始連接(''engine.raw_connection()'')和'flavor ='mysql''(但在新版本中不再支持)。 – joris

回答

2

傳遞SQLAlchemy的引擎只支持從熊貓開始0.14.0

爲了與舊版本的熊貓使用to_sql,你需要將原始連接(engine.raw_connection())和flavor='mysql'to_sql

myd.to_sql(name='[tablename]', con=engine.raw_connection(), flavor='mysql', if_exists='replace', index=False) 

但是,我建議升級您的熊貓版本(傳遞原始連接已棄用,並且不再支持新版熊貓版本,則只支持sqlalchemy引擎/連接)