java - 如何使用 Spring Data cassandara 创建表？

Question

我已经像这样创建了自己的存储库：

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

那么问题是如何为此自动创建 cassandra 表？目前 Spring 注入MyRepository尝试将实体插入到不存在的表中。

那么有没有办法在 spring 容器启动期间创建 cassandra 表（如果它们不存在）？

PS如果只有配置布尔属性而不添加xml行并创建像BeanFactory等这样的东西，那就太好了。:-)

score 11 · Accepted Answer

覆盖 AbstractCassandraConfiguration 类的 getSchemaAction 属性

@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());
    }

}

score 10 · Accepted Answer

您可以在application.properties中使用此配置

spring.data.cassandra.schema-action=CREATE_IF_NOT_EXISTS

score 5 · Accepted Answer

您还需要在 AbstractCassandraConfiguration 实现中覆盖 getEntityBasePackages() 方法。这将允许 Spring 找到您使用 @Table 注释的任何类，并创建表。

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

score 4 · Accepted Answer

您需要在pom.xml文件中包含spring-data-cassandra依赖项。

如下配置您的TestConfig.class：

@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());
}
}

最后一个getInitialEntitySet方法可能是可选的。试试没有这个。

确保.properties文件中的Keyspace、contactpoints和port 。喜欢：

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

score 1 · Accepted Answer

实际上，在深入研究位于中的源代码后spring-data-cassandra:3.1.9，您可以检查实现：

org.springframework.data.cassandra.config.SessionFactoryFactoryBean#performSchemaAction

实施如下：

protected void performSchemaAction() throws Exception {

    boolean create = false;
    boolean drop = DEFAULT_DROP_TABLES;
    boolean dropUnused = DEFAULT_DROP_UNUSED_TABLES;
    boolean ifNotExists = DEFAULT_CREATE_IF_NOT_EXISTS;

    switch (this.schemaAction) {
        case RECREATE_DROP_UNUSED:
            dropUnused = true;
        case RECREATE:
            drop = true;
        case CREATE_IF_NOT_EXISTS:
            ifNotExists = SchemaAction.CREATE_IF_NOT_EXISTS.equals(this.schemaAction);
        case CREATE:
            create = true;
        case NONE:
        default:
            // do nothing
    }

    if (create) {
        createTables(drop, dropUnused, ifNotExists);
    }
}

这意味着您必须分配CREATE到schemaAction是否从未创建过表。并且CREATE_IF_NOT_EXISTS剂量不起作用。

更多信息请在此处查看：为什么带有 `spring-data-cassandra` 的`spring-data-jpa` 不会自动创建 cassandra 表？

java - 如何使用 Spring Data cassandara 创建表？

5 回答 5

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