Question

我试图使用spring-data-cassandra（1.1.2.RELEASE），而我遇到了JPA用语中缺少可嵌入类型映射的问题。

我有一个像这样的实体类：

@Table
public class Customer {

    private UUID id;
    private String name;
    private Address address;

    public UUID getId() {
        return id;
    }

    public void setId(UUID id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

 }

和可嵌入的Address类：

public class Address {

    private String address;
    private String city;
    private String state;
    private String zip;

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getState() {
        return state;
    }

    public void setState(String state) {
        this.state = state;
    }

    public String getZip() {
        return zip;
    }

    public void setZip(String zip) {
        this.zip = zip;
    }

}

我的cassandra表：

create table customer ( 
    id uuid primary key, 
    name text, 
    address text, 
    city text, 
    state text, 
    zip text
);

我希望将Address的属性映射到包含的实体，我不想要一个单独的地址表。在JPA中，我相信我会使用@Embeddable注释。 spring-data-cassandra中是否有类似的构造？

Answer 1

spring-data-cassandra尚不支持嵌入类型。功能请求位于DATACASS-167。

要嵌入的实体的唯一可能部分是主键。如果您的主键包含多个字段，则可以将这些字段外部化为单独的类，然后使用@PrimaryKey注释将其用于其中。

Comment.java

@Table("comments")
public class Comment {

    @PrimaryKey
    private CommentKey pk;

    private String text;
}

CommentKey.java

@PrimaryKeyClass
public class CommentKey implements Serializable {

    private static final long serialVersionUID = -7871651389236401141L;

    @PrimaryKeyColumn(ordinal = 0, type = PrimaryKeyType.PARTITIONED)
    private String author;

    @PrimaryKeyColumn(ordinal = 1)
    private String company;
}

HTH，马克

spring-data-cassandra组件/复杂类型非规范化映射

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