models - Preparing for Magento Developer Certification - Study Guide -

i'm preparing mcd exam , i'm stuck on chapter 4 work database stuff. allready answers of questions, these ones no documentation.

here questions can not explain, don't know refer to, , need should able give responses:

**

• 1.describe load-and-save process of regular entity
• 2.describe group save operations
• 3.describe collection interface (filtering/sorting/grouping)
• 4.describe hierarchy of database-related classes in magento
• 5.describe role , hierarchy of setup objects in magento

**

thanks in advance , sorry bad english.

edit

munjals link magento's varien data collections quite basic understanding how models collections works. however, article not give right information answer questions ask. again munjal.

therefore, question of me remains. grateful more , tips

my understanding of questions:

1.describe load-and-save process of regular entity

i think here load , save actions in different classes used in process. there lot spread on system. important in order fire.

2.describe group save operations

???

3.describe collection interface (filtering/sorting/grouping)

???

4.describe hierarchy of database-related classes in magento

do question mean in order classes instantiated , inherit?

5.describe role , hierarchy of setup objects in magento

??

1. its orm not controller actions
2. its transactions
3. its can collection since collections extend same abstract collection gives filtering, sorting, group ....
4. check class hierarchy of orm related classes use when creating own eav , mysql4 models
5. installer scripts , setup classes should watched in core , call hierarchy

good luck ;)