au.com.cybersearch2.example

Class H2ManyToManyMain

java.lang.Object

au.com.cybersearch2.example.ManyToManyMain

au.com.cybersearch2.example.H2ManyToManyMain

public class H2ManyToManyMain
extends ManyToManyMain

H2ManyToManyMain

Author:

Andrew Bowley 16 May 2015 H2 database version uses a connection source which allows multiple connections. ORIGINAL COMMENTS: Main sample routine to show how to do many-to-many type relationships. It also demonstrates how we user inner queries as well foreign objects.

NOTE: We use asserts in a couple of places to verify the results but if this were actual production code, we would have proper error handling.

CLASSYTOOLS COMMENTS:

This example shows JPA in action. The application code exempifies use of a standard persistence interface. The OrmLite implemention is mostly hidden in library code, but does show up in named queries where, to keep things lightweight, OrmLite QueryBuilder is employed in place of a JQL implementation @see ManyToManyGenerator.

Also noteable is dependency injection using Dagger @see ManyToManyModule. If one studies the details, what the dependency inject allows is flexibility in 3 ways:

1. Choice of database - the PersistenceContext binding
2. Location of resource files such as persistence.xml (and Locale too) - the ResourceEnvironment binding
3. How to reduce background thread priority - the ThreadHelper binding

Field Summary

Fields inherited from class au.com.cybersearch2.example.ManyToManyMain

POSTS_BY_USER, PU_NAME, USERS_BY_POST

Constructor Summary

Constructors

Constructor and Description
H2ManyToManyMain() Create H2ManyToManyMain object This creates and populates the database using JPA, provides verification logic and runs a test from main().

Method Summary

Modifier and Type	Method and Description
static void	main(String[] args) Test ManyToMany association

Methods inherited from class au.com.cybersearch2.example.ManyToManyMain

close, getPost1, getPost2, getUser1, getUser2, setUp, verifyPostsByUser, verifyUsersByPost

Methods inherited from class java.lang.Object

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

Constructor Detail

H2ManyToManyMain

public H2ManyToManyMain()

Create H2ManyToManyMain object This creates and populates the database using JPA, provides verification logic and runs a test from main().

Method Detail

main

public static void main(String[] args)

Test ManyToMany association

Parameters:

args - Not used