microsoft / microsoft/sql-server-samples
Issue with sql connector from python using Hashbytes
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Description
I am sending this code via odbc connector to my sql server
Select Column,HASHBYTES('SHA2_256', CONVERT(VARBINARY(8),Column)) as Encoded_Column from table
Result is different if I run using connector vs if I run it on the sql server as a query.
I understand the issues with doing it via python hashlib and all, but why if I am just querying database with a connector and querying it, result is different.
One of our old sql legacy code, converts a numerical column in sql using the HASHBYTES function and sha2_256.
The entire process is moving to python as we are putting in some advanced usage on top of the legacy work. However, when using connector, we are calling the same sql code, the HASHBYTES('sha2_256',column_name) id returning values with lot of garbage.
Running the code in sql result in this
Column Encoded_Column
101286297 0x7AC82B2779116F40A8CEA0D85BE4AA02AF7F813B5383BAC60D5E71B7BDB9F705
Running same sql query from python result in
Column Encoded_Column
101286297
b"z\xc8+'y\x11o@\xa8\xce\xa0\xd8[\xe4\xaa\x02\xaf\x7f\x81;S\x83\xba\xc6\r^q\xb7\xbd\xb9\xf7\x05"
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Research direction
The payload names no repository file or test. Start by reproducing the HASHBYTES query through the Python ODBC connector and compare its returned value with the SQL Server result, then determine whether the discrepancy is an expected binary representation or a connector issue.
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Assessment
- Tech stack
- python, sql
- Domain
- databases
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100