小编sur*_*esh的帖子

如何将String映射到List和List to String？

考虑一下我们跟随classess

class People{
    private String primaryEmailAddress;
    private String secondaryEmailAddress;
    private List<String> phones;
    //getter and setters
}

class PeopleTO{
    private List<String> emailAddress;
    private String primaryPhone;
    private String secondaryPhone;
    //getter and setters
}

在Dozer和Orika中,我们可以使用以下代码行轻松映射

fields("primaryEmailAddress", "emailAddress[0]")
fields("secondaryEmailAddress", "emailAddress[1]")

fields("phones[0]", "primaryPhone")
fields("phones[1]", "secondaryPhone")

我如何在MapStruct中进行相同类型的映射？我会在哪里找到有关mapstruct的更多示例？

在cassandra中创建表时,我们可以给出具有如下排序的聚类键.

Create table user(partitionkey int, id int, name varchar, age int, address text, 
   insrt_ts timestamp,
 Primary key(partitionkey, name, insrt_ts, id)
 with clustering order by (name asc, insrt_ts desc, id asc);

当我们将数据插入该表时,根据cassandra文档记录基于聚类键进行排序.

当我使用CQL1和CQL2检索记录时,我得到的是相同的排序顺序.

CQL1:

Select * from user where partitionkey=101;

CQL2:

Select * from user where partitionkey=101 order by name, insrt desc, id;

CQL1和CQL2有什么区别？