HeidiSQL import csv empty fields - mysql

Question

I want to import a csv file to my MySQL database with HeidiSQL.
But some of my fields are empty.
What could I do to let HeidiSQL know these empty values have to be seen as NULL-values?
Sample of csv-file (last 2 fields not yet known):
NULL;Students Corner;437452182;;
Create commands:
CREATE TABLE `db`.`customers` (
`company_id` INT NOT NULL AUTO_INCREMENT ,
`company_name` VARCHAR(40) NULL ,
`company_number` INT NULL ,
`company_vat` INT NULL ,
`company_zip` INT NULL,
PRIMARY KEY (`company_id`) );
I get these error:
Incorrect integer value: '' for column 'company_id' at row 1 */
Incorrect integer value: '' for column 'company_vat' at row 1 */
Incorrect integer value: '' for column 'company_zip' at row 1 */
etc

Answer 1

If solved it by writing \N in each empty field instead of writing NULL !

Answer 2

You can import CSV files into MySQL using a LOAD DATA INFILE query.
In your case, you would write something like this:
LOAD DATA INFILE filename.txt
INTO TABLE customers
FIELDS TERMINATED BY ';'
LINES TERMINATED BY '\n'
(#id, #name, #number, #vat, #zip)
SET
company_id = (CASE WHEN #id='' THEN NULL ELSE #id END),
company_name = (CASE WHEN #name='' THEN NULL ELSE #name END),
company_number = (CASE WHEN #number='' THEN NULL ELSE #number END),
company_vat = (CASE WHEN #vat='' THEN NULL ELSE #vat END),
company_zip = (CASE WHEN #zip='' THEN NULL ELSE #zip END)
(you may need to adjust this, depending on your end of line markers, etc, but this should be pretty close to what you need)