REATE TABLE t_testblob (
     filename VARCHAR2(30) DEFAULT NULL NULL,
     apkdata  BLOB         NULL
)

INSERT INTO table_name VALUES (memberlist,?,memberlist)
 UPDATE table_name SET ImageFieldName = ? WHERE ID=yourId

cursor = connection.cursor()
for txt in ('a', 'b', 'c'):
    cursor.execute('SELECT * FROM test WHERE txt=?', (txt,))

cursor.execute("INSERT INTO t_testblob (filename, apkdata) VALUE (?, ?)", filename, my_binary_data)