从 Oracle DB 下载数据并导出到 csv 文件

Question

I have a connection to some Oracle data base and trying to export the data to a csv file. Below is my Python code -

import jpype
import jaydebeapi
import csv

# Assuming I already have established a connection -
# Connection variable is Conn

Curs = Conn.cursor()
Curs.execute("select * from Table")
Data = list(Curs.fetchall())

with open("mycsvfile.csv", "wb") as f:
    w = csv.DictWriter(f, Data[0].keys())
    w.writerow(dict((fn,fn) for fn in Data[0].keys()))
    w.writerows(Data)

But when I ran above code, I got error as -

Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
AttributeError: 'tuple' object has no attribute 'keys'

Could you please help me to find a way out?

Many thanks for your help

Answer 1

You can easily generate csv using sqlplus or SQLcl:

https://docs.oracle.com/en/database/oracle/oracle-database/12.2/sqpug/generating-HTML-reports-from-SQL-Plus.html

https://oracle-base.com/articles/misc/sqlcl-format-query-results-with-the-set-sqlformat-command

https://www.thatjeffsmith.com/archive/2015/02/a-quick-4-1-trick-set-sqlformat/

Answer 2

I am using this code to create a csv file using Python ( in my case with headers ). I think you should try cx_Oracle , for me it is the best way to interact with Oracle databases from Python.

import os
import sys
import cx_Oracle 

db = cx_Oracle.connect('user/pass@host:port/service_name')
SQL = "select column1 , column2 , .... , columnn from table"
print(SQL)
cursor = db.cursor()
f = open("C:\myfile.csv", "w")
writer = csv.writer(f, lineterminator="\n", quoting=csv.QUOTE_NONNUMERIC)
r = cursor.execute(SQL)

#this takes the column names
col_names = [row[0] for row in cursor.description]

writer.writerow(col_names)

for row in cursor:
   writer.writerow(row)
f.close()