com.germinus.merlin.dao
Interface IGenericDao<T,PK extends java.io.Serializable>

All Known Subinterfaces:

ICourseDao

All Known Implementing Classes:

AssignmentDao, CourseDao, CourseDaoJpa, GenericDaoHibernate

public interface IGenericDao<T,PK extends java.io.Serializable>

Generic DAO (Data Access Object) with common methods to CRUD POJOs.

Extend this interface if you want typesafe (no casting necessary) DAO's for your domain objects.

Author:

Bryan Noll

Method Summary

boolean	exists(PK id) Checks for existence of an object of type T using the id arg.
T	get(PK id) Generic method to get an object based on class and identifier.
java.util.List<T>	getAll() Generic method used to get all objects of a particular type.
void	remove(PK id) Generic method to delete an object based on class and id
T	save(T object) Generic method to save an object - handles both update and insert.

Method Detail

getAll

java.util.List<T> getAll()

Generic method used to get all objects of a particular type. This is the same as lookup up all rows in a table.

Returns:

List of populated objects

get

T get(PK id)

Generic method to get an object based on class and identifier. An ObjectRetrievalFailureException Runtime Exception is thrown if nothing is found.

Parameters:

id - the identifier (primary assignmentId) of the object to get

Returns:

a populated object

See Also:

ObjectRetrievalFailureException

exists

boolean exists(PK id)

Checks for existence of an object of type T using the id arg.

Parameters:

id -

Returns:

- true if it exists, false if it doesn't

save

T save(T object)

Generic method to save an object - handles both update and insert.

Parameters:

object - the object to save

remove

void remove(PK id)

Generic method to delete an object based on class and id

Parameters:

id - the identifier (primary assignmentId) of the object to remove