如何使用Spring Boot初始化Cassandra键空间和表 [英] How to initialize Cassandra keyspace and tables with Spring boot

问题描述

我在我的Spring Boot应用程序中将Cassandra用作数据源，并希望在应用程序启动之前初始化数据库。

I am using Cassandra as a datasource in my Spring boot application and would like to initialize the database before the application starts.

到目前为止，我所做的是，如下面的示例所示，我定义了一个扩展了 AbstractCassandraConfiguration类的类 CassandraConfiguration，并且我有一个扩展了 CassandraRepository的存储库。当我自己创建键空间和表时，该应用程序运行良好。

Up to now what I have done is, I have defined a class "CassandraConfiguration" extending "AbstractCassandraConfiguration" class as in the examples which you can see below and I have a repository extending "CassandraRepository". When I create the keyspace and the table myself, the application works fine.

但是，我想在应用程序启动时自动创建键空间和表。为此，我在资源文件夹下提供了一个schema.cql文件，但无法使该脚本正常工作。

However, I want to create the keyspace and tables automatically while application is starting. In order to do that, I supplied a schema.cql file under resources folder but I could not make that script work.

有人知道我该怎么办吗？

Does anyone have any idea what can I do to create the keyspace(s) and tables automatically?

谢谢。

编辑：我正在使用Cassandra 2.0。 9，spring-boot 1.3.2.RELEASE和datastax cassandra驱动程序2.1.6版本。

I am using Cassandra 2.0.9, spring-boot 1.3.2.RELEASE and datastax cassandra driver 2.1.6 versions.

CassandraConfiguration.java

CassandraConfiguration.java

@Configuration
@PropertySource(value = { "classpath:cassandra.properties" })
@EnableCassandraRepositories(basePackages = { "bla.bla.bla.repository" })
public class CassandraConfiguration extends AbstractCassandraConfiguration {

    @Autowired
    private Environment environment;


    @Bean
    public CassandraClusterFactoryBean cluster() {
        CassandraClusterFactoryBean cluster = new CassandraClusterFactoryBean();
        cluster.setContactPoints( environment.getProperty( "cassandra.contactpoints" ) );
        cluster.setPort( Integer.parseInt( environment.getProperty( "cassandra.port" ) ) );
        return cluster;
    }


    @Bean
    public CassandraMappingContext cassandraMapping() throws ClassNotFoundException {
        return new BasicCassandraMappingContext();
    }


    @Bean
    public CassandraConverter converter() throws ClassNotFoundException {
        return new MappingCassandraConverter(cassandraMapping());
    }


    @Override
    protected String getKeyspaceName() {
        return environment.getProperty( "cassandra.keyspace" );
    }


    @Bean
    public CassandraSessionFactoryBean session() throws Exception {

        CassandraSessionFactoryBean session = new CassandraSessionFactoryBean();
        session.setCluster(cluster().getObject());
        session.setKeyspaceName(environment.getProperty("cassandra.keyspace"));
        session.setConverter(converter());
        session.setSchemaAction(SchemaAction.NONE);

        return session;
    }


    @Override
    public SchemaAction getSchemaAction() {
        return SchemaAction.RECREATE_DROP_UNUSED;
    }
}

推荐答案

如果您仍然对此有疑问，在 Spring Boot 2和SD Cassandra 2.0.3 中，您可以执行简单的Java配置并立即设置所有内容。

If you are still having problems with this, in Spring Boot 2 and SD Cassandra 2.0.3 you can do this straightforward Java configuration and setup everything out of the box.

@Configuration
@EnableCassandraRepositories(basePackages = "com.example.repository")
public class DbConfigAutoStart extends AbstractCassandraConfiguration {

    /*
     * Provide a contact point to the configuration.
     */
    @Override
    public String getContactPoints() {
        return "exampleContactPointsUrl";
    }

    /*
     * Provide a keyspace name to the configuration.
     */
    @Override
    public String getKeyspaceName() {
        return "exampleKeyspace";
    }

    /*
     * Automatically creates a Keyspace if it doesn't exist
     */
    @Override
    protected List<CreateKeyspaceSpecification> getKeyspaceCreations() {
        CreateKeyspaceSpecification specification = CreateKeyspaceSpecification
                .createKeyspace("exampleKeyspace").ifNotExists()
                .with(KeyspaceOption.DURABLE_WRITES, true).withSimpleReplication();
        return Arrays.asList(specification);
    }


    /*
     * Automatically configure a table if doesn't exist
     */
    @Override
    public SchemaAction getSchemaAction() {
        return SchemaAction.CREATE_IF_NOT_EXISTS;
    }


    /*
     * Get the entity package (where the entity class has the @Table annotation)
     */
    @Override
    public String[] getEntityBasePackages() {
        return new String[] { "com.example.entity" };
    }

您很好！

这篇关于如何使用Spring Boot初始化Cassandra键空间和表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！