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1. How to check if any object is related to a row in a table with constrain of foreign key    stackoverflow.com

I am using Hibernate and MySql. I have a 2 tables: 

User: id, name, type
City: id, name, type
type: id, name
Where user.type has foreign key to user_type.id. and as well city. I would like before ...

2. Java MySQL create a column to join multiple rows of another table's column    stackoverflow.com

Java MySQL create a column to join multiple rows of another table's column: In other words I would like to understand if it is possible to have MySQL Java object (e.g. class ...

3. 2 ways to get the latest row from db    stackoverflow.com

i have a struts2 app with spring transactions and JPA2 over hibernate. The problem is that i have some rows in the database that are changed by an external source (some ...