Pickle protocol fix #34
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When using SQLAlchemy and Unicode fields having unique length of 256 we get a unique index length of 256 * 3 = 768 bytes, and 767 are allowed! This causes an error: "sqlalchemy.exc.ProgrammingError: (mysql.connector.errors.ProgrammingError) 1071 (42000): Specified key was too long; max key length is 767 bytes" While the length of the 255 is quite enough to store uuid4 - hashes.
Only pickle protocol version 0 and 1 can accurately convert the data to a string, because the storage we use the "Text" type field. In Python 3 pickle.dumps function protocol version installed by default 3. Therefore calls pickle.dumps() to explicitly specify the protocol version 0. This was done.
This was referenced May 11, 2023
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Error when using Python 3 + Unicode.
Only pickle protocol version 0 and 1 can accurately convert the data to
a string, because the storage we use the "Text" type field. I was the
reason that the data is simply not saved to the database, without any errors.
In Python 3 pickle.dumps function protocol version installed by default 3.
Therefore calls pickle.dumps() to explicitly specify the protocol version 0.
This was done.