使用基于 Java 的配置在服务器模式下设置 H2

Question

我有 spring XML，它使我能够使用以下配置以服务器模式启动 H2 数据库：

<beans profile="test-h2">
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
          destroy-method="close">
        <property name="driverClassName" value="org.h2.Driver"/>
        <property name="url" value="jdbc:h2:target/h2/pps;AUTO_SERVER=TRUE"/>
        <property name="username" value="sa"/>
        <property name="password" value=""/>
    </bean>
    <bean id="entityManagerFactory" parent="entityManagerFactoryCommonParent">
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.hbm2ddl.auto">create-drop</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>

我想转换为基于 java 的配置。我在这里似乎有一个帖子：Start and setup in-memory DB using Spring 问了同样的问题，我查看了嵌入式数据库的http://docs.spring.io/spring/docs/3.0.x/spring-framework-reference/html/jdbc.html#jdbc-embedded-database-support，但它没有说明如何将 H2 模式设置为服务器模式。它仅在“mem”模式下为我启动服务器。

我有以下代码：

EmbeddedDatabaseBuilder builder = new EmbeddedDatabaseBuilder();

builder.setType(EmbeddedDatabaseType.H2);
builder.setName(DATABASE_NAME);
builder.addScript(H2_SCHEMA);
builder.addScript(H2_TEST);
return builder.build();

也许使用 EmbeddedDatabaseBuilder(ResourceLoader) 可能会起作用。有人有一些示例代码吗？

Answer 1

这是允许您使用基于 java 的 spring 配置以服务器模式启动 H2 数据库的代码：

private static final String H2_JDBC_URL_TEMPLATE = "jdbc:h2:%s/target/db/sample;AUTO_SERVER=TRUE";
@Value("classpath:seed-data.sql")
private Resource H2_SCHEMA_SCRIPT;

@Value("classpath:test-data.sql")
private Resource H2_DATA_SCRIPT;

@Value("classpath:drop-data.sql")
private Resource H2_CLEANER_SCRIPT;


@Bean
public DataSource dataSource(Environment env) throws Exception {
        return createH2DataSource();
}


@Autowired
@Bean
public DataSourceInitializer dataSourceInitializer(final DataSource dataSource) {

    final DataSourceInitializer initializer = new DataSourceInitializer();
    initializer.setDataSource(dataSource);
    initializer.setDatabasePopulator(databasePopulator());
    initializer.setDatabaseCleaner(databaseCleaner());
    return initializer;
}


private DatabasePopulator databasePopulator() {
    final ResourceDatabasePopulator populator = new ResourceDatabasePopulator();
    populator.addScript(H2_SCHEMA_SCRIPT);
    populator.addScript(H2_DATA_SCRIPT);
    return populator;
}

private DatabasePopulator databaseCleaner() {
    final ResourceDatabasePopulator populator = new ResourceDatabasePopulator();
    populator.addScript(H2_CLEANER_SCRIPT);
    return populator;
}

private DataSource createH2DataSource() {
    String jdbcUrl = String.format(H2_JDBC_URL_TEMPLATE, System.getProperty("user.dir"));
    JdbcDataSource ds = new JdbcDataSource();       
    ds.setURL(jdbcUrl);
    ds.setUser("sa");
    ds.setPassword("");

    return ds;
}

@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(entityManagerFactory);
    return transactionManager;
}

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory(Environment env) throws Exception {
    HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
    vendorAdapter.setGenerateDdl(Boolean.TRUE);
    vendorAdapter.setShowSql(Boolean.TRUE);     

    LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
    factory.setPersistenceUnitName("sample");
    factory.setJpaVendorAdapter(vendorAdapter);
    factory.setPackagesToScan("com.sample.model");
    factory.setDataSource(dataSource(env));     

    factory.setJpaProperties(jpaProperties());
    factory.setLoadTimeWeaver(new InstrumentationLoadTimeWeaver());

    return factory;
}

Properties jpaProperties() {
    Properties props = new Properties();
    props.put("hibernate.query.substitutions", "true 'Y', false 'N'");
    props.put("hibernate.hbm2ddl.auto", "create-drop");
    props.put("hibernate.show_sql", "false");
    props.put("hibernate.format_sql", "true");

    return props;
}

Answer 2

我相信这是不可能的。术语嵌入式数据库在不需要服务器的数据库中，并且嵌入在应用程序中，因此您不应为此使用 EmbeddedDatabase。

在 h2 文档中，术语“嵌入式”被“本地”迷住了 - （连接到嵌入式（本地）数据库），当他们使用“服务器”时，他们谈论远程连接，其中数据库由服务器管理。为了强化这一想法，EmbeddedDataSource 接口仅添加了一个数据源“shutdown”接口中不存在的方法，该方法通常用于在应用程序关闭时关闭数据库，例如通过@Bean(destroyMethod="shutdown")。

在此处查看更多详细信息：

http://h2database.com/html/features.html#database_url

When is a database called as an Embedded database?

http://docs.spring.io/spring/docs/3.0.x/api/org/springframework/jdbc/datasource/embedded/EmbeddedDatabase.html