ORA-01036: illegal variable name/number in python

May 31, 2022

enter image description here I am trying to insert a csv file into database by python. The database is oracle . Below is my code csv file name is PatientStatus and Table name is AIW1
import cx_Oracle as cn
import pandas as pd # pip install pandas

```
df = pd.read_csv('PatientStatus.csv')



columns = [ 'UNITNAME' ,
            'PATIENTSTATUS', 'PATIENTCOUNTS', 'COUNTRY','STATENAME','CITYNAME']

df_data = df[columns]
records = df_data.values.tolist()

conn = cn.connect(user="", password="",dsn="")


sql_insert = '''
    INSERT INTO AIW1
    VALUES (?, ?, ?, ?, ?, ?, ?,?,?)
'''
cursor = conn.cursor()
cursor.executemany(sql_insert, records)
cursor.commit();    
print('Task is complete.')
cursor.close()
conn.close()
```
I am getting the 
DatabaseError

Traceback (most recent call last)
C:\Users\SOFTWA~1.SUP\AppData\Local\Temp/ipykernel_956/3684779769.py in
21 ”’
22 cursor = conn.cursor()
—> 23 cursor.executemany(sql_insert, records)
24 cursor.commit();
25 print(‘Task is complete.’)

DatabaseError: ORA-01036: illegal variable name/number
Thanks in advance

>Solution :

In Oracle, you need to use a different bind placeholder syntax, not ‘?’.

Look at the cx_Oracle documentation for an example of efficiently loading data, see Batch Statement Execution and Bulk Loading. You can adjust your data to a similar format if you still want the overhead of using Pandas.

import cx_Oracle
import csv

# Predefine the memory areas to match the table definition.
# This can improve performance by avoiding memory reallocations.
# Here, one parameter is passed for each of the columns.
# "None" is used for the ID column, since the size of NUMBER isn't
# variable.  The "25" matches the maximum expected data size for the
# NAME column
cursor.setinputsizes(None, 25)

# Adjust the number of rows to be inserted in each iteration
# to meet your memory and performance requirements
batch_size = 10000

with open('testsp.csv', 'r') as csv_file:
    csv_reader = csv.reader(csv_file, delimiter=',')
    sql = "insert into test (id,name) values (:1, :2)"
    data = []
    for line in csv_reader:
        data.append((line[0], line[1]))
        if len(data) % batch_size == 0:
            cursor.executemany(sql, data)
            data = []
    if data:
        cursor.executemany(sql, data)
    con.commit()