Question

我正在努力将字符串对象从source（Relation.class）映射到目标列表（RelationListDTO.class）。

Relation.java

   public class Relation {

    private String name;
    private String email;
    private String completeAddress;

    // getters and setters
}

RelationListDTO.java

public class RelationListDTO {
        private String name;
        private String email;
        private List<Address> address;

        // getters and setters
    }

Address.java

public class Address{
private String street;
private String city;
// getters and setters
}

映射器类

@Mapper

public interface RelationMapper {

    @Mapping(source = "completeAddress", target = "address.get(0).city")
            RelationListDTO relationToListDto(Relation relation);
}

但是它不起作用。谁能帮忙。

Answer 1

无法使用MapStruct进行操作。因为MapStruct不适用于运行时对象。 MapStruct仅生成用于映射两个bean的纯Java代码。而且我发现您的要求很少。您有一个地址列表，但只想映射源对象中的城市？您仍然可以这样做

DECLARE @tbl TABLE(SomeData VARCHAR(100));
INSERT INTO @tbl VALUES('A');

WITH cte AS
(
     select SomeData as SzamlatetelId
     from @tbl K 
     where K.SomeData = 'B' --try this with 'A' to get a result
)
--the query will use the cte instead of the actual query
select  
    (select *
     from cte
     for xml raw('Kiertekeles'), TYPE) 
--and there will be no result, if the cte has no rows
WHERE (SELECT COUNT(*) FROM cte)>0
for xml raw('Kiertekelesek'), ELEMENTS, TYPE

Answer 2

不确定在接受答案时这是否可行，但我和您遇到了同样的问题，最终还是这样做了。

@Mapper(imports = Collections.class)
public interface RelationMapper {
    @Mapping(expression = "java(Collections.singletonList(relation.getCompleteAddress()))", target = "address")
            RelationListDTO relationToListDto(Relation relation);
}

Mapstruct映射-字符串到列表<字符串>

2 个答案: