Kiss MySQL goodbye for development and say hello to HSQLDB

The days of using MySQL, DB2, PostgreSQL etc for development is over.. I don’t know why any programmer would be developing using them..Every deveroper should be running some in memory database like HSQLDB as part of the project for development and testing then move the a full size database for unit testing, staging and production.This is a sample Spring Project to show how to use JavaConfig and HSQLDB. This example also will show how to use @PropertySource for reading properties and using the Environment Object to add properties to your objects.

How to use Spring JavaConfig and not XML files for configuation

Consider replacing Spring XML configuration with JavaConfigUsing Spring XML configuration is so 2000’s the time has come to push the XML away and look at JavaConfig.Here is the main code to my sample projectview sourceprint?

01.

public

class

Main

02.

{

03.

04.

private

static

final

Logger LOGGER = getLogger(Main.

class

);

05.

06.

public

static

void

main(

String

[] args)

07.

{

08.

// in this setup, both the main(String[]) method and the JUnit method both specify that

09.

ApplicationContext context =

new

AnnotationConfigApplicationContext( DatabaseConfiguration.

class

);

10.

11.

MessageService mService = context.getBean(MessageService.

class

);

12.

13.

/**

14.

*   Saving Message to database

15.

*/

16.

Message message =

new

Message();

17.

message.setMessage(

"Hello World"

);

18.

mService.SaveMessage(message);

19.

/**

20.

* Saving 2nd Message in database.

21.

*/

22.

message.setMessage(

"I love NYC"

);

23.

mService.SaveMessage(message);

24.

25.

/**

26.

* Getting messages from database

27.

*- display number of message(s)

28.

*- display each message in database

29.

*/

30.

List<Message> myList = mService.listMessages();

31.

LOGGER.debug(

"You Have "

+ myList.size() +

" Message(s) In The Database"

);

32.

33.

for

(Message i : myList)

34.

{

35.

LOGGER.debug(

"Message: ID: "

+ i.getId() +

", Message: "

+ i.getMessage() +

"."

);

36.

}

37.

}

38.

}

Now lets take a look at how I setup the database in JavaConfig and not in a XML file.view sourceprint?

01.

@Configuration

02.

@EnableTransactionManagement

03.

@ComponentScan(basePackageClasses = {Main.

class

})

04.

@PropertySource(

"classpath:application.properties"

)

05.

public

class

DatabaseConfiguration

06.

{

07.

@Bean

08.

public

DataSourceInitializer dataSourceInitializer(DataSource dataSource) {

09.

ResourceDatabasePopulator resourceDatabasePopulator =

new

ResourceDatabasePopulator();

10.

resourceDatabasePopulator.addScript(

new

ClassPathResource(

"/schema.sql"

));

11.

12.

DataSourceInitializer dataSourceInitializer =

new

DataSourceInitializer();

13.

dataSourceInitializer.setDataSource(dataSource);

14.

dataSourceInitializer.setDatabasePopulator(resourceDatabasePopulator);

15.

return

dataSourceInitializer;

16.

}

17.

18.

@Bean

19.

public

DataSource hsqlDataSource() {

20.

BasicDataSource basicDataSource =

new

BasicDataSource();

21.

basicDataSource.setDriverClassName(org.hsqldb.jdbcDriver.

class

.getName());

22.

basicDataSource.setUsername(

"sa"

);

23.

basicDataSource.setPassword(

""

);

24.

basicDataSource.setUrl(

"jdbc:hsqldb:mem:mydb"

);

25.

return

basicDataSource;

26.

}

27.

28.

@Bean

29.

public

LocalSessionFactoryBean sessionFactory(Environment environment,

30.

DataSource dataSource) {

31.

32.

String

packageOfModelBeans = Message.

class

.getPackage().getName();

33.

LocalSessionFactoryBean factoryBean =

new

LocalSessionFactoryBean();

34.

factoryBean.setDataSource(dataSource);

35.

factoryBean.setHibernateProperties(buildHibernateProperties(environment));

36.

factoryBean.setPackagesToScan(packageOfModelBeans);

37.

return

factoryBean;

38.

}

39.

40.

protected

Properties buildHibernateProperties(Environment env) {

41.

Properties hibernateProperties =

new

Properties();

42.

43.

hibernateProperties.setProperty(

"hibernate.dialect"

, env.getProperty(

"hibernate.dialect"

));

44.

hibernateProperties.setProperty(

"hibernate.show_sql"

, env.getProperty(

"hibernate.show_sql"

));

45.

hibernateProperties.setProperty(

"hibernate.use_sql_comments"

, env.getProperty(

"hibernate.use_sql_comments"

));

46.

hibernateProperties.setProperty(

"hibernate.format_sql"

, env.getProperty(

"hibernate.format_sql"

));

47.

hibernateProperties.setProperty(

"hibernate.hbm2ddl.auto"

, env.getProperty(

"hibernate.hbm2ddl.auto"

));

48.

49.

hibernateProperties.setProperty(

"hibernate.generate_statistics"

, env.getProperty(

"hibernate.generate_statistics"

));

50.

51.

hibernateProperties.setProperty(

"javax.persistence.validation.mode"

, env.getProperty(

"javax.persistence.validation.mode"

));

52.

53.

//Audit History flags

54.

hibernateProperties.setProperty(

"org.hibernate.envers.store_data_at_delete"

, env.getProperty(

"org.hibernate.envers.store_data_at_delete"

));

55.

hibernateProperties.setProperty(

"org.hibernate.envers.global_with_modified_flag"

, env.getProperty(

"org.hibernate.envers.global_with_modified_flag"

));

56.

57.

return

hibernateProperties;

58.

}

59.

60.

@Bean

61.

public

HibernateTransactionManager hibernateTransactionManager(SessionFactory sessionFactory) {

62.

return

new

HibernateTransactionManager(sessionFactory);

63.

}

64.

}

You can see how easy it is to use JavaConfig and Not XML.. The time of using XML files with Springs is over…

Down and Run Project

If you would like to download the project from GitHub and run it just follow the following commands:view sourceprint?

1.

git clone git@github.com:JohnathanMarkSmith/NoMySQL.git

2.

cd NoMySQL

3.

mvn

package

4.

cd target

5.

java -jar NoMySQL.jar

Thats it and you should see the following line on the console:

2013-04-30 10:47:17,790 [main] DEBUG com.johnathanmarksmith.noMySQL.Main - You Have 2 Message(s) In The Database2013-04-30 10:47:17,790 [main] DEBUG com.johnathanmarksmith.noMySQL.Main - Message: ID: 1, Message: Hello World.2013-04-30 10:47:17,790 [main] DEBUG com.johnathanmarksmith.noMySQL.Main - Message: ID: 2, Message: I love NYC.

This Project is using Java, Spring, Hibernate, Maven, jUnit, Log4J, HSQLDB and Github.LIFE IS SO EASY WORKING WITH GIT, MAVEN, SPRING….