The immediate concern is losing your license and how you will get to and from work. If you have to drive a company vehicle, that could be a special concern as well. You may be eligible for a special permit that allows you to drive for employment reasons, but the company insurance may not let you drive a vehicle.
It depends what country your visa is for. Generally a DUI will not affect your work visa if it's already been issued, except for if you got jail time, in which case this may activate the clause in your visa that would expel you from the country upon your release.
It depends on a lot of factors. The best plan is to NOT get a DUI, which is fairly easy to avoid. Otherwise, it depends on which country has issued the visa, where you work, and your history with regards to both.
Getting a DUI should not affect a work Visa unless someone was hurt or if major property damage occured . The DUI will have consequences but overall will not be reported to the government
It could affect your work visa but in general it doesn't. It will just affect your license. If you have a visa in Canada to work you won't be affected much so you don't really have to worry too much about that. It's okay. You just make sure that nothing happens again.
There is a chance that you could get your work Visa taken away after you receive a Driving Under the Influence Charge. Most countries won't even let you visit if you do this. You may have to go back home, depending on how lenient the judge is.