如何使用 spring 数据 cassandara 创建表？

Question

I have created my own repository like that:

public interface MyRepository extends TypedIdCassandraRepository<MyEntity, String> {
}

So the question how automatically create cassandra table for that? Currently Spring injects MyRepository which tries to insert entity to non-existent table.

So is there a way to create cassandra tables (if they do not exist) during spring container start up?

PS It would be very nice if there is just config boolean property without adding lines of xml and creation something like BeanFactory and etc. :-)

Answer 1

Overide the getSchemaAction property on the AbstractCassandraConfiguration class

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

    @Override
    public String getKeyspaceName() {
        return "test_config";
    }

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

    @Bean
    public CassandraOperations cassandraOperations() throws Exception {
        return new CassandraTemplate(session().getObject());
    }

}

Answer 2

您可以在application.properties 中使用此配置

spring.data.cassandra.schema-action=CREATE_IF_NOT_EXISTS

Answer 3

You'll also need to Override the getEntityBasePackages() method in your AbstractCassandraConfiguration implementation. This will allow Spring to find any classes that you've annotated with @Table, and create the tables.

@Override
public String[] getEntityBasePackages() {
    return new String[]{"com.example"};
}

Answer 4

1. You'll need to include spring-data-cassandra dependency in your pom.xml file.

2. Configure your TestConfig.class as below:

    @Configuration @PropertySource(value = { "classpath:Your .properties file here" }) @EnableCassandraRepositories(basePackages = { "base-package name of your Repositories'" }) public class CassandraConfig { @Autowired private Environment environment; @Bean public CassandraClusterFactoryBean cluster() { CassandraClusterFactoryBean cluster = new CassandraClusterFactoryBean(); cluster.setContactPoints(env.getProperty("contactpoints from your properties file")); cluster.setPort(Integer.parseInt(env.getProperty("ports from your properties file"))); return cluster; } @Bean public CassandraConverter converter() { return new MappingCassandraConverter(mappingContext()); } @Bean public CassandraSessionFactoryBean session() throws Exception { CassandraSessionFactoryBean session = new CassandraSessionFactoryBean(); session.setCluster(cluster().getObject()); session.setKeyspaceName(env.getProperty("keyspace from your properties file")); session.setConverter(converter()); session.setSchemaAction(SchemaAction.CREATE_IF_NOT_EXISTS); return session; } @Bean public CassandraOperations cassandraTemplate() throws Exception { return new CassandraTemplate(session().getObject()); } @Bean public CassandraMappingContext mappingContext() throws ClassNotFoundException { CassandraMappingContext mappingContext= new CassandraMappingContext(); mappingContext.setInitialEntitySet(getInitialEntitySet()); return mappingContext; } @Override public String[] getEntityBasePackages() { return new String[]{"base-package name of all your entity annotated with @Table"}; } @Override protected Set<Class<?>> getInitialEntitySet() throws ClassNotFoundException { return CassandraEntityClassScanner.scan(getEntityBasePackages()); } }

   This last getInitialEntitySet method might be an Optional one. Try without this too.

3. Make sure your Keyspace , contactpoints and port in .properties file. Like :

    cassandra.contactpoints=localhost,127.0.0.1 cassandra.port=9042 cassandra.keyspace='Your Keyspace name here'