如何使用映射管理器在cassandra日期字段中存储java.sql.Date？

有人可以帮助我使用Java以yyyy-mm-dd格式将当前系统日期存储在cassandra日期列中吗？ 使用MappingManager保存java.sql.Dateexception。

我的示例程序是：

Test.java

 import com.datastax.driver.mapping.annotations.Table; import java.sql.Date; @Table(keyspace = "testing", name = "test") public class Test { private String uid; private Date rece; public String getUid() { return uid; } public void setUid(String uid) { this.uid = uid; } public Date getRece() { return rece; } public void setRece(Date rece) { this.rece = rece; } } 

TestDao.java

 Mapper mapper = new MappingManager(session).mapper(Test.class); mapper.save(test); 

卡桑德拉图式：

 CREATE TABLE tokenizer.test ( id text PRIMARY KEY, testdate date ) ; 

Answer 1

将rece数据类型声明为com.datastax.driver.core.LocalDate或编写自定义编解码器以编码java.sql.Date并将其注册到集群。

自定义编解码器示例：

 import com.datastax.driver.core.LocalDate; import com.datastax.driver.core.ProtocolVersion; import com.datastax.driver.core.TypeCodec; import com.datastax.driver.core.exceptions.InvalidTypeException; import java.nio.ByteBuffer; import java.sql.Date; public class DateCodec extends TypeCodec { private final TypeCodec innerCodec; public DateCodec(TypeCodec codec, Class 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(); } } 

如何使用它 ？

示例：

 CodecRegistry codecRegistry = new CodecRegistry(); codecRegistry.register(new DateCodec(TypeCodec.date(), Date.class)); try (Cluster cluster = Cluster.builder().withCodecRegistry(codecRegistry).addContactPoint("127.0.0.1").withCredentials("cassandra", "cassandra").build(); Session session = cluster.connect("test")) { Mapper mapper = new MappingManager(session).mapper(Test.class); mapper.save(test); }