cx_Oracle - “期望 None 或字符串”

Question

I am on the following cx_Oracle version

>>> cx_Oracle.version
'5.0.3'

I am getting this exception in executing a query

"expecting None or a string"

The query is being executed this way

cursor.execute("SELECT * FROM APP_STORE WHERE STORE=:STORE %s" %(order_clause),{'STORE':STORE})

What could be the reason? Similar queries executed earlier in the flow work fine but this one does not.

Appreciate some guidance on this.

Answer 1

You are building your cursor incorrectly. Since you pass a dictionary, you much first prepare your query:

cursor.prepare("SELECT * FROM APP_STORE WHERE STORE=:STORE %s" %(order_clause))

Then you execute it and pass None as the first parameter.

results = cursor.execute(None, {'STORE':STORE})

If you wish to change the STORE parameter and run the query again, all you need to do now is modify the dictionary and rerun the execute statement. prepare ing it again is not needed.

More information can be found at the Oracle+Python Querying best practices documentation . The information I provided, above, is in the "Bind Variable Patterns" section (no direct link seems to be available)