问题描述
我的桌子如下,
create table contact( id uuid primary key,personName text,updatedTime timestamp
);
并尝试执行以下prepare语句,
String query = "SELECT * FROM CONTACT WHERE personName IN (:personNameList) " +
"AND updatedTime > ':startTime' AND updatedTime < :endTime ALLOW FILTERING;";
SimpleStatement simpleStatement = SimpleStatement.builder(query)
.setConsistencyLevel(DefaultConsistencyLevel.QUORUM)
.build();
PreparedStatement preparedStatement = cqlSession.prepare(simpleStatement);
BoundStatement boundStatement = preparedStatement.bind();
personList = ["John","Alex"];
boundStatement.setString("startTime","2020-08-16 14:44:32+0000"); // Issue with setting
boundStatement.setString("endTime","2020-08-16 14:60:32+0000"); // Issue with setting
boundStatement.setList("personNameList",personList,String.class); // Codec not found for requested operation: [TEXT <-> java.util.List<java.lang.String>]
ResultSet execute = cqlSession.execute(boundStatement);
// List<Person> personList = // Mapping
从驱动程序映射的4.7.2开始,根据我的理解,它与映射的类型不同,我无法从Google那里获得答案。有什么建议吗?
<dependency>
<groupId>com.datastax.oss</groupId>
<artifactId>java-driver-mapper-processor</artifactId>
<version>4.7.2</version>
<scope>test</scope>
</dependency>
解决方法
在Java驱动程序4.x中,对象映射器已经发生了很大变化,因此它需要setting up of the compile-time processor来生成其工作所需的辅助类。但是您仍然可以使用它通过在DAO接口中用Row
annotation声明方法来将GetEntry
对象转换为POJO,如下所示:
@Dao
public interface PersonDao {
@GetEntity
Person asPerson(Row row);
}
但是,如果您要使用对象Mapper,我建议将其用于所有内容-在您的情况下,您可以使用Query
annotation声明一个方法,并传递绑定参数