Package com.github.collinalpert.java2db.services

Class BaseService<T extends BaseEntity>

java.lang.Object

com.github.collinalpert.java2db.services.BaseService<T>

Direct Known Subclasses:

BaseCodeAndDescriptionService

public class BaseService<T extends BaseEntity>
extends Object

Author:

Collin Alpert

Class that provides base functionality for all service classes. Every service class must extend this class.

Constructor Summary

Constructors

Constructor	Description
BaseService(Class<T> clazz)	Constructor for the base class of all services.

Method Summary

Modifier and Type	Method	Description
boolean	create(T instance)	Creates a Java entity on the database.
void	delete(int id)	Deletes a row by an id.
void	delete(T instance)	Deletes the corresponding row on the database.
List<T>	getAll()
T	getById(int id)
protected ResultSet	getByPredicate(SqlPredicate<T> predicate, DBConnection connection)
List<T>	getMultiple(SqlPredicate<T> predicate)
T	getSingle(SqlPredicate<T> predicate)
boolean	update(T instance)	Applies updates to an entity on the database.

Methods inherited from class java.lang.Object

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

Constructor Detail

BaseService

public BaseService(Class<T> clazz)

Constructor for the base class of all services. It is possible to create instances of it.

Parameters:

clazz - The entity class corresponding to this service class.

Method Detail

create

public boolean create(T instance)

Creates a Java entity on the database.

Parameters:

instance - The instance to create on the database.

Returns:

True if the INSERT was successful, false if not.

getByPredicate

protected ResultSet getByPredicate(SqlPredicate<T> predicate,
                                   DBConnection connection)

Parameters:

predicate - The SqlPredicate for constraints on the SELECT query.

connection - A connection to execute the query on.

Returns:

A ResultSet by a predicate.

getSingle

public T getSingle(SqlPredicate<T> predicate)

Parameters:

predicate - The SqlPredicate to add constraints to a SELECT query.

Returns:

An entity matching the result of the query.

getMultiple

public List<T> getMultiple(SqlPredicate<T> predicate)

Parameters:

predicate - The SqlPredicate to add constraints to a SELECT query.

Returns:

A list of entities matching the result of the query.

getById

public T getById(int id)

Parameters:

id - The id of the desired entity.

Returns:

Gets an entity by its id.

getAll

public List<T> getAll()

Returns:

All entities in this table.

update

public boolean update(T instance)

Applies updates to an entity on the database.

Parameters:

instance - The instance to update on the interface.

Returns:

True if the update is successful, false if not.

delete

public void delete(T instance)

Deletes the corresponding row on the database.

Parameters:

instance - The instance to delete on the database.

delete

public void delete(int id)

Deletes a row by an id.

Parameters:

id - The row with this id to delete.