How to silently truncate strings while storing them when they are longer than the column length definition?

Question

I have a web app, using EclipseLink and MySQL for storing data. Some of these data are strings, ie varchars in the DB. In the code of entities, the strings have attributes

Answer 1

There is another way to do it, may be even faster (at least it works on 5th version of MySql):

First, check your sql_mode setting: there is a detailed description how to do it. This setting should have value of "" for windows, and "modes" for Unix.

That didn't help me, so I found another setting, this time in jdbc:

jdbcCompliantTruncation=false. 

In my case (I used persistence) it is defined in persistence.xml:

These 2 settings work only together, I tried to use them separately and had no effect.

Notice: remember that by setting sql_mode as described above you switch off important database checks, so please do it carefully.