pyodbc MERGE INTO 错误：HY000：驱动程序未提供错误

Question

I'm trying to execute many (~1000) MERGE INTO statements into oracledb 11.2.0.4.0(64bit) using python 3.9.2(64bit) and pyodbc 4.0.30(64bit). However, all the statements return an exception:

HY000: The driver did not supply an error

I've tried everything I can think of to solve this problem, but no luck. I tried changing code, encodings/decodings and ODBC driver from oracle home 12.1(64bit) to oracle home 19.1(64bit). I also tried using pyodbc 4.0.22 in which case the error just changed into:

<class 'pyodbc.ProgrammingError'> returned a result with an error set

Which is not any more helpful error than the first one. The issue I assume cannot be the MERGE INTO statement itself, because when I try running them directly in the database shell, it completes without issue.

Below is my code. I guess I should also mention the commands and parameters are read from stdin before being executed, and oracledb is using utf8 characterset.

cmds = sys.stdin.readlines()
comms = json.loads(cmds[0])
conn = pyodbc.connect(connstring)
conn.setencoding(encoding="utf-8")

cursor = conn.cursor()
cursor.execute("""ALTER SESSION SET NLS_DATE_FORMAT='YYYY-MM-DD"T"HH24:MI:SS.....'""")

for comm in comms:
  params = [(None) if str(x)=='None' or str(x)=='NULL' else (x) for x in comm["params"]]
  try:
    cursor.execute(comm["sql"],params)
  except Exception as e:
    print(e)

conn.commit()
conn.close()

Edit: Another things worth mentioning for sure - this issue began after python2.7 to 3.9.2 update. The code itself didn't require any changes at all in this particular location, though.

Answer 1

I've had my share of HY000 errors in the past. It almost always came down to a syntax error in the SQL query. Double check all your double and single quotes, and makes sure the query works when run independently in an SQL session to your database.