如何使用Spring Data Cassandra将java.util.Date值插入Cassandra日期类型列中? [英] How to insert java.util.Date values into Cassandra date type column using Spring Data Cassandra?

问题描述

我有带有日期类型列的cassandra表，如下所示:

I have cassandra table with a date type column as follows:

create table people
(
   id int primary key, 
   name text, 
   email text, 
   dob date
);

我正在使用SpringBoot 1.5.2 + Spring Data Cassandra Starter.

I am using SpringBoot 1.5.2 + Spring Data Cassandra Starter.

@Table("people")
public class Person {
    @PrimaryKey
    Integer id;
    private String name;
    private String email;
    private java.util.Date dob;
    //setters and getters
}

public interface PersonRepository extends CrudRepository<Person, Integer>{

}

我要插入新的Person，如下所示:

I am inserting new Person as follows:

personRepository.save(new Person(1, "Siva","[e-mail]", new java.util.Date()));

它抛出以下错误:

Caused by: com.datastax.driver.core.exceptions.InvalidQueryException: Expected 4 byte long for date (8)
    at com.datastax.driver.core.Responses$Error.asException(Responses.java:136) ~[cassandra-driver-core-3.1.4.jar:na]
    at com.datastax.driver.core.DefaultResultSetFuture.onSet(DefaultResultSetFuture.java:179) ~[cassandra-driver-core-3.1.4.jar:na]
    at com.datastax.driver.core.RequestHandler.setFinalResult(RequestHandler.java:177) ~[cassandra-driver-core-3.1.4.jar:na]
    at com.datastax.driver.core.RequestHandler.access$2500(RequestHandler.java:46) ~[cassandra-driver-core-3.1.4.jar:na]

但是，如果我将 dob 列类型设置为 timestamp ，则它可以正常工作.可以有 date 类型列并使用 java.util.Date 类型属性吗?

But if I make dob column type to timestamp then it is working fine. Is it possible to have date type column and use java.util.Date type properties?

P.s:即使我使用java.sql.Date，我也会遇到相同的错误.

P.s: Even if I use java.sql.Date I am getting the same error.

推荐答案

使用com.datastax.driver.core.LocalDate

Use com.datastax.driver.core.LocalDate

您可以使用这些方法中的任何一种从java.util.Date

You can use any of these method to get LocalDate from java.util.Date

• LocalDate.fromYearMonthDay(2017，03，28)
• LocalDate.fromMillisSinceEpoch(new Date().getTime())

或者您可以创建自己的编解码器，以便将java.util.Date插入Cassandra日期类型.

Or you could create your own codec that will allow you to insert java.util.Date into Cassandra date type.

您可以像下面这样开始:

You can start like the below one :

public class DateCodec extends TypeCodec<Date> {

    private final TypeCodec<LocalDate> innerCodec;

    public DateCodec(TypeCodec<LocalDate> codec, Class<Date> javaClass) {
        super(codec.getCqlType(), javaClass);
        innerCodec = codec;
    }

    @Override
    public ByteBuffer serialize(Date value, ProtocolVersion protocolVersion) throws InvalidTypeException {
        return innerCodec.serialize(LocalDate.fromMillisSinceEpoch(value.getTime()), protocolVersion);
    }

    @Override
    public Date deserialize(ByteBuffer bytes, ProtocolVersion protocolVersion) throws InvalidTypeException {
        return new Date(innerCodec.deserialize(bytes, protocolVersion).getMillisSinceEpoch());
    }

    @Override
    public Date parse(String value) throws InvalidTypeException {
        return new Date(innerCodec.parse(value).getMillisSinceEpoch());
    }

    @Override
    public String format(Date value) throws InvalidTypeException {
        return value.toString();
    }

}

创建连接时，您必须注册:

When creating connectin you have to register :

CodecRegistry codecRegistry = new CodecRegistry();
codecRegistry.register(new DateCodec(TypeCodec.date(), Date.class));
Cluster.builder().withCodecRegistry(codecRegistry).build();

更多信息: http://docs.datastax. com/en/developer/java-driver/3.1/manual/custom_codecs/

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