如何利用spring boot数据映射cassandra中的用户数据类型

Question

我正在寻找一些与使用Cassandra数据库的spring boot数据相关的帮助。
在我的pom.xml中有以下依赖项。

        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-boot-starter-data-cassandra</artifactId>
        </dependency>

        <dependency>
            <groupId>com.datastax.cassandra</groupId>
            <artifactId>cassandra-driver-core</artifactId>
            <version>2.1.10.3</version>
        </dependency>
        <dependency>
            <groupId>com.datastax.cassandra</groupId>
            <artifactId>cassandra-driver-mapping</artifactId>
            <version>2.1.10.3</version>
        </dependency>

The table structure looks like:

@Table(value = "TEST_ORDERS")
public class OrderDTO {

    @PrimaryKey
    @Column(value = "email")
    private String emailId;

    @Column(value = "order_id")
    private int orderId;

    @Column(value = "creation_date")
    private Timestamp creationDate;

    @Column(value = "discount_total")
    private double discountTotal;

    @Column(name = "shipments")
    //This is a UDT type
    private Set<ShippingDetails> shipments;

    //getters and setters here
}

The ShippingDetails object is a UDT with following declartion and i defined as a frozen collection in the cassandra CQL sripts

@UDT(name = "shipping", keyspace = "mc_checkout")
public class ShippingDetails {

    @Field(name = "name")
    private FullName name;

    @Field(name = "quantity_shipped")
    private int quantityShipped;

    @Field(name = "shipping_address")
    private CheckoutAddress shippingAddress; 
    //so on
}

There is a repository created for the basic CRUD operations:
@Repository
public interface OrderRepository extends CrudRepository<OrderDTO, String> {

}

    When i try to invoke findOne API of this repository in my Service class 

我得到以下错误：Cassandra实体必须有@Table、@Persistent或@PrimaryKeyClass注释

Answer 1

spring Apache Data for Cassandra和DataStax的Mapping是两个独立的工具，它们试图实现相同的功能。请随便用一种，但不要把这两种混用。

crudrepository是spring数据类型，而@field和@udt来自Datastax映射。

Apache Cassandra对spring数据的UDT支持从1.5版开始提供，请参阅参考文档。Apache Cassandra 1.5的spring数据需要Datastax Java驱动程序3.0或更新版本。