SQL insertions enhancements

[razaina]

SQLITE is pretty slow so currently I am using MyQSL instead to improve insertions' time execution in the database. Performances (in term of time execution) is roughly multiplied by 100 now...

I had to make some changes also as MySQL is more strict while defining the types of each element of the DB.

How to use:

For testing, I am using MariaDB through a docker container https://hub.docker.com/_/mariadb/

• docker pull mariadb
• docker run -p 3306:3306 --name mymariadb --e MYSQL_ROOT_PASSWORD=mystrongpassword -e MYSQL_DATABASE=mydatabase -d mariadb:latest --max_allowed_packet=100M

user='root'
password='mystrongpassword'
port='3306'
mysql_database_name='mydatabase'

DATABASE='mysql://{0}:{1}@0.0.0.0:{2}/{3}?charset=utf8mb4'.format(user, password, port, mysql_database_name)

myDB = AppSQLModel(DATABASE)
 [...]
myDB.add_classes(classes)
myDB.add_properties(properties)
[...]

[dorneanu]

Thanks for this PR! There are a lot of changes. I'll have to review them first.