import cx_Oracle

con = cx_Oracle.connect(‘username’, ‘password’, ‘dsn’)

blob_sql = "select column_name from table where clause"

cursor = con.cursor()

cursor.execute(blob_sql)

result = cursor.fetchall()

file = open('file_name', "wb")

file.write(result[0][0].read()) #可以print查看result的内容，根据实际情况read

file.close()

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