Package org.minijax.dao

Class DefaultBaseDao

java.lang.Object

org.minijax.dao.DefaultBaseDao

All Implemented Interfaces:

BaseDao

public class DefaultBaseDao
extends Object
implements BaseDao

The Dao class is the interface for all database access.

Field Summary

Fields

Modifier and Type	Field	Description
protected jakarta.persistence.EntityManager	em

Constructor Summary

Constructors

Constructor	Description
DefaultBaseDao()

Method Summary

Modifier and Type	Method	Description
<T extends BaseEntity> long	countAll(Class<T> entityClass)	Counts all rows of a type.
<T extends BaseEntity> T	create(T obj)	Inserts a new instance in the database.
<T extends BaseEntity> void	delete(T obj)	Soft deletes an object.
jakarta.persistence.EntityManager	getEntityManager()
<T extends BaseEntity> void	purge(T obj)	Hard deletes an object.
<T extends BaseEntity> T	read(Class<T> entityClass, UUID id)	Retrieves an object by ID.
<T extends NamedEntity> T	readByHandle(Class<T> entityClass, String handle)	Finds a user by handle.
<T extends BaseEntity> List<T>	readPage(Class<T> entityClass, int page, int pageSize)	Returns a page of objects.
<T extends BaseEntity> T	update(T obj)	Updates an object.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

em

protected jakarta.persistence.EntityManager em

Constructor Detail

DefaultBaseDao

public DefaultBaseDao()

Method Detail

getEntityManager

public jakarta.persistence.EntityManager getEntityManager()

Specified by:

getEntityManager in interface BaseDao

create

public <T extends BaseEntity> T create(T obj)

Inserts a new instance in the database.

Specified by:

create in interface BaseDao

Parameters:

obj - The object to create.

Returns:

The instance with ID.

read

public <T extends BaseEntity> T read(Class<T> entityClass,
                                     UUID id)

Retrieves an object by ID.

Specified by:

read in interface BaseDao

Parameters:

id - The ID.

Returns:

The object if found; null otherwise.

readByHandle

public <T extends NamedEntity> T readByHandle(Class<T> entityClass,
                                              String handle)

Finds a user by handle. Returns the user on success. Returns null on failure.

Specified by:

readByHandle in interface BaseDao

Parameters:

handle - The user's handle.

Returns:

The user on success; null on failure.

readPage

public <T extends BaseEntity> List<T> readPage(Class<T> entityClass,
                                               int page,
                                               int pageSize)

Returns a page of objects.

Specified by:

readPage in interface BaseDao

Parameters:

entityClass - The entity class.

page - The page index (zero indexed).

pageSize - The page size.

Returns:

A page of objects.

update

public <T extends BaseEntity> T update(T obj)

Updates an object.

Specified by:

update in interface BaseDao

Parameters:

obj - The object to update.

delete

public <T extends BaseEntity> void delete(T obj)

Soft deletes an object. The data is still in the database, but with deleted flag.

Specified by:

delete in interface BaseDao

Parameters:

obj - The object to delete.

purge

public <T extends BaseEntity> void purge(T obj)

Hard deletes an object. This purges the data from the database.

Specified by:

purge in interface BaseDao

Parameters:

obj - The object to delete.

countAll

public <T extends BaseEntity> long countAll(Class<T> entityClass)

Counts all rows of a type.

Specified by:

countAll in interface BaseDao

Parameters:

entityClass - The entity class.

Returns:

The count of rows.