IN clause for Oracle Prepared Statement in Python cx_Oracle

Question

I’d like to use the IN clause with a prepared Oracle statement using cx_Oracle in Python.

E.g. query – select name from employee where id in ('101', '102', '103')

On python side, I have a list [101, 102, 103] which I converted to a string like this ('101', '102', '103') and used the following code in python –

import cx_Oracle
ids = [101, 102, 103]
ALL_IDS = "('{0}')".format("','".join(map(str, ids)))
conn = cx_Oracle.connect('username', 'pass', 'schema')
cursor = conn.cursor()
results = cursor.execute('select name from employee where id in :id_list', id_list=ALL_IDS)
names = [x[0] for x in cursor.description]
rows = results.fetchall()

This doesn’t work. Am I doing something wrong?

Asked By: van_d39

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Source

Answer 1

This concept is not supported by Oracle — and you are definitely not the first person to try this approach either! You must either:

create separate bind variables for each in value — something that is fairly easy and straightforward to do in Python
create a subquery using the cast operator on Oracle types as is shown in this post: https://asktom.oracle.com/pls/asktom/f?p=100:11:0::::p11_question_id:210612357425
use a stored procedure to accept the array and perform multiple queries directly within PL/SQL
or do something else entirely!

Answered By: Anthony Tuininga

Answer 2

Since you created the string, you’re almost there. This should work:

results = cursor.execute('select name from employee where id in ' + ALL_IDS)

Answered By: Sam Salous

Answer 3

Otra opción es dar formato a una cadena con la consulta.

import cx_Oracle
ids = [101, 102, 103]
ALL_IDS = "('{0}')".format("','".join(map(str, ids)))
conn = cx_Oracle.connect('username', 'pass', 'schema')
cursor = conn.cursor()

query = """
select name from employee where id in ('{}')
""".format("','".join(map(str, ids)))

results = cursor.execute(query)
names = [x[0] for x in cursor.description]
rows = results.fetchall()

Answered By: calosh

Answer 4

Just transform your list into a tuple and format the sql string with it

ids = [101, 102, 103]
param = tuple(ids)
results = cursor.execute("select name from employee where id IN {}".format(param))

Answered By: Fabiano Soder

IN clause for Oracle Prepared Statement in Python cx_Oracle

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