Initialize database without XML configuration, but using @Configuration

Question

I would like to know how to initialize a database without having to create an XML file.

I already use this kind of initialization that works fine, but in my current case I don't want to create an XML:

<jdbc:initialize-database data-source="dataSource">
  <jdbc:script location="classpath:com/foo/sql/db-schema.sql"/>
  <jdbc:script location="classpath:com/foo/sql/db-test-data.sql"/>
</jdbc:initialize-database>

I know I can create an embedded database with:

EmbeddedDatabaseBuilder builder = new EmbeddedDatabaseBuilder();
EmbeddedDatabase db = builder.setType(H2).addScript("my-schema.sql").addScript("my-test-data.sql").build();

In my case, the database and schema are created using Liquibase.

I just want to initialize it with Spring and with my customized dataset, without having to create a new XML file each time just for that.

Is it possible?

Answer 1

The following lines of code inside your @Configuration class might work.

@Value("classpath:com/foo/sql/db-schema.sql")
private Resource schemaScript;

@Value("classpath:com/foo/sql/db-test-data.sql")
private Resource dataScript;

@Bean
public DataSourceInitializer dataSourceInitializer(final DataSource dataSource) {
    final DataSourceInitializer initializer = new DataSourceInitializer();
    initializer.setDataSource(dataSource);
    initializer.setDatabasePopulator(databasePopulator());
    return initializer;
}

private DatabasePopulator databasePopulator() {
    final ResourceDatabasePopulator populator = new ResourceDatabasePopulator();
    populator.addScript(schemaScript);
    populator.addScript(dataScript);
    return populator;
}

Answer 2

You have to create your own schema.sql and put it in your src/main/resources-folder.

import javax.sql.DataSource;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.jdbc.datasource.SimpleDriverDataSource;
import org.springframework.jdbc.datasource.init.DatabasePopulator;
import org.springframework.jdbc.datasource.init.DatabasePopulatorUtils;
import org.springframework.jdbc.datasource.init.ResourceDatabasePopulator;

@Configuration
public class DataSourceInitializer {

    @Bean(name = "dataSource")
    public DataSource getDataSource(){
        DataSource dataSource = createDataSource();
        DatabasePopulatorUtils.execute(createDatabasePopulator(), dataSource);
        return dataSource;
    }

    private DatabasePopulator createDatabasePopulator() {
        ResourceDatabasePopulator databasePopulator = new ResourceDatabasePopulator();
        databasePopulator.setContinueOnError(true);
        databasePopulator.addScript(new ClassPathResource("schema.sql"));
        return databasePopulator;
    }

    private SimpleDriverDataSource createDataSource() {
        SimpleDriverDataSource simpleDriverDataSource = new SimpleDriverDataSource();
        simpleDriverDataSource.setDriverClass(org.h2.Driver.class);
        simpleDriverDataSource.setUrl("jdbc:h2:target/database/example;AUTO_RECONNECT=TRUE");
        simpleDriverDataSource.setUsername("");
        simpleDriverDataSource.setPassword("");
        return simpleDriverDataSource;      
    }
}