未找到请求操作的编解码器：[UDT("keyspace".user_product_info) <->model.user.UserProductInfo]

Question

问题：

我正在使用 DataStax Java Driver 4.9 我已经在我的密钥空间中声明了一个 UDT user_product_info，这使用了嵌套的 UDT......在运行程序时它显示在执行以下操作时找不到 Codec线

**

PreparedStatement preparedUpdateFriendRating = session.prepare("UPDATE friend_rating SET user_product_infos=:userproductinfos WHERE user_id=:userId ;");
preparedUpdateFriendRating.bind(new ArrayList(userProductInfo), id);

**

下面是shema.cql

CREATE TYPE IF NOT exists user_product_info (id text,short_product frozen < short_product>,test set < text >,ratings list< frozen < rating > >);

CREATE TABLE IF NOT exists friend_rating(user_id text,user_product_infos list < frozen < user_product_info >>,PRIMARY KEY (user_id));

CREATE TYPE IF NOT exists short_product (name text,specs SET < text >,img text);

有对应的java类

//------------------------------------USER PRODUCT INFO-----------


@SchemaHint(targetElement = UDT)
public class UserProductInfo {

    @CqlName("id")
    private String productId;

    @CqlName("short_product")
    private ShortProduct shortProduct;

    @CqlName("test")
    private Set<String> test;

    @CqlName("ratings")
    private List<Rating> ratings;

    public UserProductInfo() {}

//with getters and setters
}

//---------------------------------------SHORT PRODUCT----------------

@SchemaHint(targetElement = UDT)
public class ShortProduct {
    @CqlName("name")
    private String name;

    @CqlName("specs")
    private Set<String> specs;

    @CqlName("img")
    private String imageUrl;

    public ShortProduct() {}
//with getters and setters
}

//--------------------------------------FRIEND RATING TABLE-------------------

@SchemaHint(targetElement = TABLE)
public class FriendRating {
    @PartitionKey
    @CqlName("user_id")
    private String userId;

    @CqlName("user_product_infos")
    private List<UserProductInfo> userProductInfos;

//with getters and setters
}
'''

具有以下堆栈跟踪：

com.datastax.oss.driver.api.core.type.codec.CodecNotFoundException: Codec not found for requested operation: [UDT("keyspace".user_product_info) <-> model.user.UserProductInfo]
    at com.datastax.oss.driver.internal.core.type.codec.registry.CachingCodecRegistry.createCodec(CachingCodecRegistry.java:609) ~[java-driver-core-4.6.1.jar:na]
    at com.datastax.oss.driver.internal.core.type.codec.registry.DefaultCodecRegistry$1.load(DefaultCodecRegistry.java:95) ~[java-driver-core-4.6.1.jar:na]
    at com.datastax.oss.driver.internal.core.type.codec.registry.DefaultCodecRegistry$1.load(DefaultCodecRegistry.java:92) ~[java-driver-core-4.6.1.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2276) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2154) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$Segment.get(LocalCache.java:2044) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache.get(LocalCache.java:3951) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache.getOrLoad(LocalCache.java:3973) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4957) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4963) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.internal.core.type.codec.registry.DefaultCodecRegistry.getCachedCodec(DefaultCodecRegistry.java:117) ~[java-driver-core-4.6.1.jar:na]
    at com.datastax.oss.driver.internal.core.type.codec.registry.CachingCodecRegistry.codecFor(CachingCodecRegistry.java:196) ~[java-driver-core-4.6.1.jar:na]
    at com.datastax.oss.driver.internal.core.type.codec.registry.CachingCodecRegistry.createCodec(CachingCodecRegistry.java:567) ~[java-driver-core-4.6.1.jar:na]
    at com.datastax.oss.driver.internal.core.type.codec.registry.DefaultCodecRegistry$1.load(DefaultCodecRegistry.java:95) ~[java-driver-core-4.6.1.jar:na]
    at com.datastax.oss.driver.internal.core.type.codec.registry.DefaultCodecRegistry$1.load(DefaultCodecRegistry.java:92) ~[java-driver-core-4.6.1.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2276) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2154) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$Segment.get(LocalCache.java:2044) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache.get(LocalCache.java:3951) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache.getOrLoad(LocalCache.java:3973) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4957) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.shaded.guava.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4963) ~[java-driver-shaded-guava-25.1-jre.jar:na]
    at com.datastax.oss.driver.internal.core.type.codec.registry.DefaultCodecRegistry.getCachedCodec(DefaultCodecRegistry.java:117) ~[java-driver-core-4.6.1.jar:na]
    at com.datastax.oss.driver.internal.core.type.codec.registry.CachingCodecRegistry.codecFor(CachingCodecRegistry.java:258) ~[java-driver-core-4.6.1.jar:na]
    at com.datastax.oss.driver.internal.core.data.ValuesHelper.encodePreparedValues(ValuesHelper.java:112) ~[java-driver-core-4.6.1.jar:na]
    at com.datastax.oss.driver.internal.core.cql.DefaultPreparedStatement.bind(DefaultPreparedStatement.java:159) ~[java-driver-core-4.6.1.jar:na]

Answer 1

你有 2 种方法来解决这个问题：

• 按照documentation 中的描述为您的UDT 实施自定义代码（我不想从中复制代码）。这是必需的，因为您使用的是核心 API (session.execute)
• 切换到使用object mapper - 您将直接使用对象、加载和保存它们等。您已经开始使用@CqlName 注释您的对象，但它们没有被使用，因为您需要设置预处理器，用于基于此注释生成代码。 （您也不需要为简单的字段名称添加注释，例如names 等。对于更复杂的名称，您也可能不需要这个，因为对象映射器具有不同的命名转换器，例如驼峰式到蛇式，等）