Using cx_Oracle, I am trying to use a Python script to execute a sql command, using the bind variables 'plat' and 'tick'. When trying to execute this command, it gives me the error "ORA-24373: invalid length specified for statement".
To debug, I made a SQL call through Oracle (not Python) using the same arguments as my script (plat=1234567, tick='ABCDE'), and it ran as expected. I tried passing the parameters as both a dict and individual named variables, but both times I got the same error.
I tried changing the values to be lower ('1' and 'A'), but even that is an 'invalid length'.
updateRecords.py
import os
import cx_Oracle
# For security reasons I cannot show my 'create_connection()' function,
# but suffice to say I have tested it and it works as desired.
...
#Setup:
WORKING_PATH = os.path.dirname(os.path.abspath(__file__))
SQL_PATH = os.path.join(WORKING_PATH, 'sql')
cnnSB = create_connection()
cnnSB_cursor = cnnSB.cursor()
...
fetchComp = open(os.path.join(SQL_PATH, 'fetchRecentEntry.sql'), 'r')
for x in range(0, 5):
cnnSB_cursor.execute(fetchComp.read(), {"plat":'A', "tick":1}) # ERROR LINE
fetchRecentEntry.sql
select *
from MFS_PCIINCEXTFUNDBYPLAT
where PLATFORM = :plat
and TICKER = :tick
and STARTDATE = (select max(STARTDATE) from MFS_PCIINCEXTFUNDBYPLAT
where PLATFORM = :plat
and TICKER = :tick)
The above snippet results in the following error message:
File "updateRecords.py", line 297, in main
cnnSB_cursor.execute(fetchComp.read(), plat='A', tick=1)
cx_Oracle.DatabaseError: ORA-24373: invalid length specified for statement
Other things I have checked:
-My fetchComp.read() DOES return the desired code
-Passing in variables as a dict object does NOT change the error message
I found a solution: The issue comes from the .read() being called inside of a loop. As a result, it would read the file correctly the first time, but on subsequent loops it would only read the null/EOF.
To fix, all I had to do was set the sql.read() to a variable before the loop, and use that variable instead of calling .read() with each loop.
Example:
sql = fetchComp.read()
for index, testRow in testDF.iterrows():
cnnSB_cursor.execute(sql, tick=testRow[1], plat=testRow[0])
compDF = pd.DataFrame(cnnSB_cursor.fetchall())