Question

我正在开发spring boot应用程序。它连接Apache Cassandra DB。我在Cassandra创建了UDT。尝试使用CassandraOperations保存数据时。我越来越异常了。我已经按照以下示例了解了Cassandra UDT。

http://www.devjavasource.com/cassandra/cassandra-udts-java-example/

Cassandra DB ：2.1.11

例外：

org.springframework.data.cassandra.mapping.VerifierMappingExceptions: com.lab.model.OrderLine:
Cassandra entities must have the @Table, @Persistent or @PrimaryKeyClass Annotation
at org.springframework.data.cassandra.mapping.BasicCassandraPersistentEntityMetadataVerifier.verify(BasicCassandraPersistentEntityMetadataVerifier.java:45) ~[spring-data-cassandra-1.4.3.RELEASE.jar:na]

OrderLine java类只有@UDT而不是@ Table，@ Persistent或@PrimaryKeyClass Annotation

import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.List;

import org.springframework.cassandra.core.PrimaryKeyType;
import org.springframework.data.cassandra.mapping.PrimaryKeyColumn;
import org.springframework.data.cassandra.mapping.Table;


@Table("order")
public class Order {

    @PrimaryKeyColumn(name = "ord_id", ordinal = 0, type = PrimaryKeyType.PARTITIONED)
     private int ord_id;
     private List<OrderLine> order_line;  

}


import java.util.UUID;
import com.datastax.driver.mapping.annotations.UDT;
@UDT(name = "order_line")
public class OrderLine {

    private UUID po_line_nbr;
    private int whpk_qty;
}

的pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.1.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>

<dependencies>

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

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-cassandra</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

如何解决此问题。

Answer 1

Spring Data Cassandra不支持Datastax的映射注释。

对Spring Data Cassandra的UDT支持即将与https://github.com/spring-projects/spring-data-cassandra/pull/84合并。

您可以使用@UserDefinedType指定UDT并使用UDTValue

@UserDefinedType
public class Address {
  String city;
  String country;
}

@Table
public class Person {

  @Id String id;
  Address address;
  UDTValue genericUdt;
}

期待Spring Data Cassandra 1.5将于今年年底发布（见https://github.com/spring-projects/spring-data-commons/wiki/Release-Train-Ingalls）

Answer 2

我使用过Mapper概念。它运作良好。我已按照以下网址解决了我的问题。

https://datastax.github.io/java-driver/2.1.7/features/object_mapper/using/

https://datastax-oss.atlassian.net/browse/JAVA-590

Cassandra UDT VerifierMappingExceptions

2 个答案: