希望我能很好地阅读文档:http://docs.datastax.com/en/developer/java-driver/3.0/java-driver/reference/crudOperations.html http://docs.datastax.com/en/developer/java-driver/3.0/java-driver/reference/crudOperations.html.
枚举注释
如果您的类包含枚举类型字段,则可以使用枚举注释。
我有一个 Java 枚举,我想使用 @Enumerated 注释,但我似乎在 3.0.0 版本的驱动程序中找不到它,它存在于 2.1.9 中。
$ find . -type f -name \*.jar|while read i; do echo ====== $i =====; jar -tf $i|grep Enumerated; done
====== ./cassandra-driver-core/2.1.4/cassandra-driver-core-2.1.4-javadoc.jar =====
====== ./cassandra-driver-core/2.1.4/cassandra-driver-core-2.1.4-sources.jar =====
====== ./cassandra-driver-core/2.1.4/cassandra-driver-core-2.1.4.jar =====
====== ./cassandra-driver-core/2.1.5/cassandra-driver-core-2.1.5.jar =====
====== ./cassandra-driver-core/2.1.7.1/cassandra-driver-core-2.1.7.1.jar =====
====== ./cassandra-driver-core/2.1.9/cassandra-driver-core-2.1.9.jar =====
====== ./cassandra-driver-core/3.0.0/cassandra-driver-core-3.0.0-sources.jar =====
====== ./cassandra-driver-core/3.0.0/cassandra-driver-core-3.0.0.jar =====
====== ./cassandra-driver-dse/2.1.5/cassandra-driver-dse-2.1.5.jar =====
====== ./cassandra-driver-extras/3.0.0/cassandra-driver-extras-3.0.0.jar =====
====== ./cassandra-driver-mapping/2.1.4/cassandra-driver-mapping-2.1.4-javadoc.jar =====
com/datastax/driver/mapping/annotations/class-use/Enumerated.html
com/datastax/driver/mapping/annotations/Enumerated.html
====== ./cassandra-driver-mapping/2.1.4/cassandra-driver-mapping-2.1.4-sources.jar =====
com/datastax/driver/mapping/annotations/Enumerated.java
====== ./cassandra-driver-mapping/2.1.4/cassandra-driver-mapping-2.1.4.jar =====
com/datastax/driver/mapping/annotations/Enumerated.class
====== ./cassandra-driver-mapping/2.1.7.1/cassandra-driver-mapping-2.1.7.1.jar =====
com/datastax/driver/mapping/annotations/Enumerated.class
====== ./cassandra-driver-mapping/2.1.9/cassandra-driver-mapping-2.1.9.jar =====
com/datastax/driver/mapping/annotations/Enumerated.class
====== ./cassandra-driver-mapping/3.0.0/cassandra-driver-mapping-3.0.0-sources.jar =====
====== ./cassandra-driver-mapping/3.0.0/cassandra-driver-mapping-3.0.0.jar =====
新版本中这有改变吗?如果是,文档可能也应该更新。
它似乎确实从来源中消失了:https://github.com/datastax/java-driver/tree/3.0/driver-mapping/src/main/java/com/datastax/driver/mapping/annotations https://github.com/datastax/java-driver/tree/3.0/driver-mapping/src/main/java/com/datastax/driver/mapping/annotations
看起来对 @Enumerated 的支持已被删除。现在,枚举支持由 drivers-extras 中的编解码器提供。查看这两张票以获取更多信息:JAVA-605 https://datastax-oss.atlassian.net/browse/JAVA-605 and JAVA-846 https://datastax-oss.atlassian.net/browse/JAVA-846.
An example https://github.com/datastax/java-driver/commit/99de43355315d26a7898ba1ff272dce45c19168b#diff-65fed7351e93083ce320a8816fdd839eR211您的枚举代码可能如下所示:
[Use] EnumOrdinalCodec
and EnumNameCodec
:
java
enum Foo {...}
enum Bar {...}
// register the appropriate codecs
CodecRegistry.DEFAULT_INSTANCE
.register(new EnumOrdinalCodec<Foo>(Foo.class))
.register(new EnumNameCodec<Bar>(Bar.class))
// the following mappings are handled out-of-the-box
@Table
public class MyPojo {
private Foo foo;
private List<Bar> bars;
...
}
我们正在修复文档。
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