Mysql – csv import thesql null

I have to import some csv-formatted data into a mysql (mariadb) database. There is no csv header and the lines look like this:

00323acd-7909-41a4-a849-073ca3391dcf,2014-05,\N
00323acd-7909-41a4-a849-073ca3391dcf,2014-05,1

So they contain some hex-id, a year/month combination and a optional int value. I use the \N (hex: 5c 4e) to mark NULL values (mysql uses this style to export null values as well).

LOAD DATA LOCAL INFILE 'path/to/data.csv' INTO TABLE data_table 
FIELDS TERMINATED BY ',' ENCLOSED BY '' 
LINES  TERMINATED BY '\n' (id, @date_time_variable, value) 
SET date = STR_TO_DATE(@date_time_variable, '%Y-%m');

But it seems like the database does not recognise the '\N'-coded Null-values.

Query OK, 38581 rows affected, 14596 warnings (0.54 sec)
Records: 38581  Deleted: 0  Skipped: 0  Warnings: 14596

MariaDB [run5]> show warnings;
+---------+------+-------------------------------------------------------------+
| Level   | Code | Message                                                     |
+---------+------+-------------------------------------------------------------+
' for column 'value' at row 1   |ger value: 'N
' for column 'value' at row 2   |ger value: 'N
' for column 'value' at row 3   |ger value: 'N

The schema looks like this:

CREATE TABLE `data_table` (
  `id` char(36) NOT NULL,
  `date` date NOT NULL,
  `value` int(11) DEFAULT NULL,
  KEY `mbid` (`id`),
  KEY `date` (`date`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Does someone know this error or a solution?

EDIT:

here is the output of show warnings \G;:

MariaDB [run5]> show warnings \G;
*************************** 1. row ***************************
  Level: Warning
   Code: 1366
' for column 'value' at row 1lue: 'N
*************************** 2. row ***************************
  Level: Warning
   Code: 1366
' for column 'value' at row 2lue: 'N
*************************** 3. row ***************************
  Level: Warning
   Code: 1366
' for column 'value' at row 3lue: 'N
*************************** 4. row ***************************
  Level: Warning
   Code: 1366
' for column 'value' at row 4lue: 'N
*************************** 5. row ***************************
  Level: Warning
   Code: 1366
' for column 'value' at row 5lue: 'N
...

And here is a hexdump of the file:

~/D/path ❯❯❯ head -n 2 data/file.csv | hexdump -C                                           master ✱ ◼
00000000  30 30 33 32 33 63 63 64  2d 37 39 30 39 2d 34 31  |00323ccd-7909-41|
00000010  61 34 2d 61 38 34 39 2d  30 37 33 63 61 33 33 39  |a4-a849-073ca339|
00000020  31 64 63 66 2c 32 30 31  34 2d 30 35 2c 5c 4e 0d  |1dcf,2014-05,\N.|
00000030  0a 30 30 33 32 33 63 63  64 2d 37 39 30 39 2d 34  |.00323ccd-7909-4|
00000040  31 61 34 2d 61 38 34 39  2d 30 37 33 63 61 33 33  |1a4-a849-073ca33|
00000050  39 31 64 63 66 2c 32 30  31 34 2d 31 32 2c 5c 4e  |91dcf,2014-12,\N|
00000060  0d 0a                                             |..|
00000062

The third row contains 2c 5c 4e, which stands for ,\N and this is correct, or isn't it?

EDIT 2:

I updated the query because I used the wrong line terminator (\n instead of \r\n). Now I get a single error message regarding this wrong value:

MariaDB [run5]> LOAD DATA LOCAL INFILE '/path/data.csv' INTO TABLE data_table FIELDS TERMINATED BY ',' ENCLOSED BY '' LINES  TERMINATED BY '\n\r' (id, @date_time_variable, value) SET date = STR_TO_DATE(@date_time_variable, '%Y-%m');
Query OK, 1 row affected, 1 warning (0.01 sec)       
Records: 1  Deleted: 0  Skipped: 0  Warnings: 1

MariaDB [run5]> show warnings \G
*************************** 1. row ***************************
  Level: Warning
   Code: 1366
Message: Incorrect integer value: 'N
00323ccd-7909-41a4-a849-073ca3391dcf' for column 'value' at row 1
1 row in set (0.00 sec)