Odd failure with no warnings, errors or exceptions thrown

Summary: Python function runs a select statement. on the 252nd iteration with different WHERE mfguids (mind you I have rearranged things and it is always on the 252 iteration regardless of the WHERE clause) it always returns no data from the fetchall() Initially the function was reusing the same connection initialized only once at start of main script, I have since tried variants using ConnectionPool, (which the connection.close() statements never seemed to release the connections back top the pool), executing the cursor and connection close methods in order and finally the current iteration which should be creating a new connection using the same parameters on each iteration and destroying it (which does not appear to be happening as the memory address seems to remain unchanged each iteration. Still it always returns no data, no warnings, no errors and no exceptions resulting in a failure due to the lack of data to return. So either I found a really corner bug (which I think someone would have hit before now) or I am doing something wrong. Any suggestions are much appreciated.

Caveats: Linux Distribution prevents upgrade beyond connector 3.1.20 and thus python module 1.0.11

Versions from /usr/bin/mariadb_config Copyright 2011-2020 MariaDB Corporation AB Get compiler flags for using the MariaDB Connector/C. Usage: mariadb_config [OPTIONS] Compiler: GNU 10.2.1

--version [10.5.19] --cc_version [3.1.20]

Output: <code> * * * * * * * * * *

Executing SQL Query: "SELECT cardid,mfguid,setTCGUid ,CONCAT_WS(' ',REGEXP_REPLACE(REGEXP_REPLACE(ed.editionName,'^(.*)(| Edition)$','
1 Edition'),'(Alpha Print Edition|1st Edition Edition)','1st Edition'),REPLACE(f.finishName,'Regular','Normal')) AS printing from g1st_fabdb.cards left join g1st_fabdb.setNames sn ON cards.setNameId=sn.setNameId LEFT JOIN g1st_fabdb.finishes f ON cards.finishId = f.finishId LEFT JOIN g1st_fabdb.editions ed ON cards.editionId = ed.editionId WHERE ( mfguid LIKE %s )AND setTCGUid = %s ;" Values:"%RVD026%" "RVD Card Data: [(148982, 'RVD026', 'RVD', 'Rhinar Edition Normal')] cardid mfguid setTCGUid printing 0 148982 RVD026 RVD Rhinar Edition Normal DBCursor Status: <mariadb.connection connected to 'localhost' at 0xffff8929bb40> True DBCardID: cardid mfguid setTCGUid printing 0 148982 RVD026 RVD Rhinar Edition Normal Length: 1 CardId 0: cardid mfguid setTCGUid printing 0 148982 RVD026 RVD Rhinar Edition Normal Card Last Updated SQL Query: SELECT card_lastupdate from g1st_fabdb.marketdata WHERE cardid=148982 ORDER BY card_lastupdate DESC LIMIT 1 Card Last Updated in DB: None In API: 2023-05-26 21:53:45

* In Set: RVD Card In set: 026 SETID: RVD026 *

* Current CardCount total: 251 * * * * * * * * * * *

Executing SQL Query: "SELECT cardid,mfguid,setTCGUid ,CONCAT_WS(' ',REGEXP_REPLACE(REGEXP_REPLACE(ed.editionName,'^(.*)(| Edition)$','
1 Edition'),'(Alpha Print Edition|1st Edition Edition)','1st Edition'),REPLACE(f.finishName,'Regular','Normal')) AS printing from g1st_fabdb.cards left join g1st_fabdb.setNames sn ON cards.setNameId=sn.setNameId LEFT JOIN g1st_fabdb.finishes f ON cards.finishId = f.finishId LEFT JOIN g1st_fabdb.editions ed ON cards.editionId = ed.editionId WHERE ( mfguid LIKE %s )AND setTCGUid = %s ;" Values:"%DRO001%" "DRO Card Data: [] False DBCursor Status: <mariadb.connection connected to 'localhost' at 0xffff8929bb40> True DBCardID: False Traceback (most recent call last): File "/home/biqu/scripts/api-dbupdate.py", line 367, in <module> if Debug : print("Length:",len(dfCardId)) TypeError: object of type 'bool' has no len()

</code> ---------------------------------------------------------------------------------------

python3 function: <code> def get_dfCardId(SetID,sName):

1. replace with cardID identification function .,+6 if not mydberror : my_cardid_query="SELECT cardid,mfguid,setTCGUid ,CONCAT_WS(' ',REGEXP_REPLACE(REGEXP_REPLACE(ed.editionName,'^(.*)(| Edition)$','
   
   1 Edition'),'(Alpha Print Edition|1st Edition Edition)','1st Edition'),REPLACE(f.finishName,'Regular','Normal')) AS printing from g1st_fabdb.cards left join g1st_fabdb.setNames sn ON cards.setNameId=sn.setNameId LEFT JOIN g1st_fabdb.finishes f ON cards.finishId = f.finishId LEFT JOIN g1st_fabdb.editions ed ON cards.editionId = ed.editionId WHERE ( mfguid LIKE %s )AND setTCGUid = %s ;" mydbSetId="%{}%" if Debug: print("Executing SQL Query: \""+my_cardid_query+"\"\n\tValues:\""+mydbSetId.format(SetID)+"\"\n\t\t\""+sName) myconn_ro=mariadb.connect(mydbparams) mydbcursor=myconn_ro.cursor() mydbcursor.execute(my_cardid_query,(mydbSetId.format(SetID),sName)) dbCardId = mydbcursor.fetchall() if Debug and myconn_ro.warnings > 0: print("Warnings: ",myconn_ro.warnings,"\n\t",myconn_ro.show_warnings) mydbcursor.close() myconn_ro.reset() if Debug: print("\t\tCard Data: ",dbCardId) if len(dbCardId)>0: dfCardId = pd.DataFrame(dbCardId,index=None,columns=('cardid','mfguid','setTCGUid','printing')) else: dfCardId = False # pd.DataFrame({'cardid':[''],'mfguid':[''],'setTCGUid':[''],'printing':['']}) print(dfCardId) if Debug: print("DBCursor Status: ",mydbcursor.connection," ",mydbcursor.closed) myconn_ro.close() return dfCardId </code>