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1. How to implement update () method in DAO using EntityManager (JPA)?    stackoverflow.com

What is the standard way to implement simple update? Example: we have User with phone number NNNNNN and now we want to set it to YYYYYY. 

@PersistenceContext
private EntityManager em;

public void update (User ...

2. DAO: how to avoid lost update?    forum.hibernate.org

Hello! When I abstract from Hibernate using the DAO Pattern, how can I avoid a lost update? For example I execute the following steps: 1. I call a "read" DAO method, which uses Hibernate to load the data I need from the database and gives me back a DTO. 2. I do something with this data and modify it. 3. I ...

3. How best to update() in a DAO?    forum.hibernate.org

Hello, I'm finishing up the hibernate port of our DAO classes (previously MySQL JDBC). I'm torn regarding the best way to update() an object in a DAO - regarding transient vs persistent state. Let me paint this picture for you (I'm not a good artist)... Our UserDAO's update(User u) method can be called in two scenarios... [ 1 ] User u ...

4. Multiple updates to a table using SAVEORUPDATE of DAO.    forum.hibernate.org

I am using saveorupdate(records) method of Hibernate template where records is a List object containing n number of records of ACCOUNT ( domain object ). The account records are retrieved and shown to the client and they can update some or none of the records. Now my question is does hibernate update all records irrespective of whether user changed it or ...

5. changing beans from dao results in automatic update?    forum.hibernate.org

Hi this is wrt hibernate 2, using spring's gethibernatetemplate functionality... we use a dao to get a list of rows (table dump), each row is a bean. Then, we iterate thru the list and format one of the properties on the bean. we take this list and pass it to a jsp. Then we use the same dao to get sums ...

6. How to implement a DAO which updates multi table?    forum.hibernate.org

Hello, I am using Hibernate3 with Spring 2. Can somebody show me how to implement a DAO to update two tables? Let me explain, there are two tables one is for order line item and the other for products. Whenever a line item is inserted I need to update the stock in product table. This should came under same transaction. Thank ...