I have played enough with vaadin UI all the graphical interfaces and stuffs. Now I need to start on the database world. To make the mysql connect it´s really simple I have already done that. But I am worried about CRUD. I have done some google search and I didn´t find anything that I really liked or that I can understand.
CRUD: Create, Read, Update, Delete is just a descrption for the primary functionalities of most web- and business-applications. If you want to use a Database for Storing your data, you will either need some knowledge about SQL or about Object-Relational-Mapping-Tools (ORM, e.g. Hibernate. Good search-term is also JPA).
Refer to the manual of your choice for more details about those.
Vaadin offers for example JPAContainer to make integrating Databases easier.