问题
I'm a new oracle learner. I'm trying to write a pandas dataframe into an oracle table. After I have made research online, I found the code itself is very simple, but I don't know why my code doesn't work.
I have read the pandas dataframe from my local file:
import cx_Oracle
import pandas as pd
import os
dir_path = os.path.dirname(os.path.realpath("__file__"))
df = pd.read_csv(dir_path+"/sample.csv")
Now print df, the dataframe df shold be like this:
DATE YEAR MONTH SOURCE DESTINATION
0 11/1/2017 1:00 2017 1 AL CO
1 11/2/2017 1:00 2017 5 GA ID
2 11/3/2017 1:00 2017 12 GA MO
Then I create connection with the database by using cx_Oracle, it works. Next I try to write the dataframe df into the table TEST. This table TEST is an empty table which already exist in oracle database, it has columns including DATE, YEAR, MONTH, SOURCE, DESTINATION in oracle. All the datatype matches the df sample data. My code is as follows:
conn_str = u'account/password@host:1521/server'
conn = cx_Oracle.connect(conn_str)
# Write records stored in a DataFrame to a oracle database
df.to_sql('TEST', conn, if_exists='replace') # the error shows here
conn.close()
It shows error:
DatabaseError: Execution failed on sql 'SELECT name FROM sqlite_master WHERE type='table' AND name=?;': ORA-01036: illegal variable name/number
How to solve the problem? Thank you very much for your time!
回答1:
I've seen similar questions on SO - it happens when you try to write to Oracle DB using connection object created by cx_Oracle.
Try to create connection using SQL Alchemy:
import cx_Oracle
from sqlalchemy import types, create_engine
conn = create_engine('oracle+cx_oracle://scott:tiger@host:1521/?service_name=hr')
df.to_sql('TEST', conn, if_exists='replace')
来源：https://stackoverflow.com/questions/47540837/how-to-write-pandas-dataframe-to-oracle-database-using-to-sql