How to update the value in database

[anitha.nagani.raj.gmail.com]

Hello,

I have a property named Last updated time in my entity.java file. I'm not showing this field in any of my xhtml files, but i want this value to be updated in the corresponding entity table of the database whenever a user adds an entity or updates an entity.

To do this i have written the code which looks like this.

protected Entity createInstance() {
                Entity entity = new Entity();
                entity.setLastUpdatedTime(new java.sql.Date(System.currentTimeMillis()));
                return entity;
}

When i add a new entity the current time value will be added to the database, but when i update the existing entity the value is not getting updated.It retains its old value. What should i do inorder to do this? please help.

[lvdberg]

Hi,

You can add something like this to your Entity, JPA will do the rest for you.:

@PrePersist
@PreUpdate
public void timeStamp(){
     lastUpdatedTime = new Date(System.currentTimeMillis());
}

Leo