Data « DAO « JPA Q&A





1. About Data Objects and DAO Design when using Hibernate    stackoverflow.com

I'm hesitating between two designs of a database project using Hibernate. Design #1. (1) Create a general data provider interface, including a set of DAO interfaces and general data container classes. It hides ...

2. How to use DAOs with hibernate/jpa?    stackoverflow.com

Assuming the DAO structure and component interaction described below, how should DAOs be used with persistence layers like hibernate and toplink? What methods should/shouldn't they contain? Would it be ...

3. DAO hibernate/JPA, data missing    coderanch.com

I have 3 classes, PerchaseOrderHeader , PerchaseOrderLines, and ItemCrossReference My problem accurs when i add the following lines in ItemCrossReference.class and in PerchaseOrderLines.class, just in order to have another level in my objects hierarchy. @OneToMany(mappedBy="itemCrossReference") private Collection perchaseOrderLinesList; @ManyToOne() @JoinColumns( { @JoinColumn(name = "POL_ORDER_CMP", referencedColumnName = "REF_CUST_CMP_CODE",insertable=false, updatable=false), @JoinColumn(name = "POL_ITEM_CODE", referencedColumnName = "REF_CUST_REF_CODE",insertable=false, updatable=false) }) private ItemCrossReference itemCrossReference; my DAO ...

4. what is the best practise to hand data not found at dao?    forum.hibernate.org

hi, I would like to seek for advice on how u friends are handling a situation whereby data is not found at Dao. e.g. i have the following method in my ItemHibernateDao implementation: public Item getItemByName(String name) { List results = getHibernateTemplate().find("from Item where name=?", name); return (Item) results.get(0); } if NO data is found, very nicely, spring will return a ...

5. hibernate DAO failed to get data from database view    forum.hibernate.org

Hi, I have created view and created the mapping document as shown below. When i tried to retrieve data from the view its giving the strange error. But the same code worked fine when i changed i dropped the view and created the table with the same name, columns, data types and the same data. What might be the problem? Hibernate ...