英文:
Using cassandra mapper with UDT in java
问题
我是Cassandra的初学者，遇到了以下问题：我定义了一个简单的用户定义类型（UDT）。
import com.datastax.oss.driver.api.mapper.annotations.CqlName;
@CqlName("emailaddress")
public class EmailAddress {
private String name;
private String email_address;
public EmailAddress() {}
public EmailAddress(String name, String emailAddress) {
this.name = name;
this.email_address = emailAddress;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail_address() {
return email_address;
}
public void setEmail_address(String email_address) {
this.email_address = email_address;
}
}
在我的实体定义中，我有以下一行：
....
@Frozen
private List<EmailAddress> participants;
.....
我创建了一个简单的Dao，其中有一个save()方法，但是当我尝试运行它时，我遇到了以下错误：
The CQL ks.table: signature_data.signatures 定义在实体类中：com.salesforceiq.graph.sigparser.Signatures中声明了编解码器注册表不支持的类型映射：
Field: participants，实体类型：com.salesforceiq.graph.sigparser.EmailAddress，CQL类型：UDT(signature_data.emailaddress)
java.lang.IllegalArgumentException：The CQL ks.table: signature_data.signatures 定义在实体类中：com.salesforceiq.graph.sigparser.Signatures中声明了编解码器注册表不支持的类型映射：
Field: participants，实体类型：com.salesforceiq.graph.sigparser.EmailAddress，CQL类型：UDT(signature_data.emailaddress)
我可能错过了一些关于我的UDT的注解，但是我无法弄清楚到底是哪一个注解。
英文:
I am total novice with cassandra and have a following problem: I defined a simple UDT
import com.datastax.oss.driver.api.mapper.annotations.CqlName;
@CqlName("emailaddress")
public class EmailAddress {
private String name;
private String email_address;
public EmailAddress() {}
public EmailAddress(String name, String emailAddress) {
this.name = name;
this.email_address = emailAddress;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail_address() {
return email_address;
}
public void setEmail_address(String email_address) {
this.email_address = email_address;
}
}
I have following line in definition for my entity:
....
@Frozen
private List<EmailAddress> participants;
.....
I created simple Dao with one method save() but when I trying to run it I am getting following error
The CQL ks.table: signature_data.signatures defined in the entity class: com.salesforceiq.graph.sigparser.Signatures declares type mappings that are not supported by the codec registry:
Field: participants, Entity Type: com.salesforceiq.graph.sigparser.EmailAddress, CQL type: UDT(signature_data.emailaddress)
java.lang.IllegalArgumentException: The CQL ks.table: signature_data.signatures defined in the entity class: com.salesforceiq.graph.sigparser.Signatures declares type mappings that are not supported by the codec registry:
Field: participants, Entity Type: com.salesforceiq.graph.sigparser.EmailAddress, CQL type: UDT(signature_data.emailaddress)
I probably miss some annotation for my UDT but I can't figure out which one
答案1
得分: 4
我假设您已经使用@Entity对您的UDT类进行了注释。有关示例，请参阅Cassandra Java驱动程序的Entities页面。
它似乎在participants列上失败了。它的类型不受支持，因此您可能需要为其实现自定义编解码器。有关详细信息，请参阅自定义编解码器页面。干杯！
英文:
I'm assuming you annotated your UDT class with @Entity. See the Entities page of the Cassandra Java driver for an example.
It appears to fail on the participants column. Its type isn't supported so you might need to implement a custom codec for it. See the Custom codecs page for details. Cheers!
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