Mapping Dto, Entity, and Vo using MapStruct

Thanks TO : https://medium.com/@Seonggil/mapping-dto-entity-and-vo-using-mapstruct-5b6a9f73f17d

ModelMapper vs MapStruct

Once both functions are used for type conversion

Used to convert one object to another type of object. Both two

Explain the differences based on MapStructure…

1. MapStruct?create implementations by reading of Annotation
2. when Compiling (ModelMapper?has a reflection when mapping occurs)
3. MapStruct can?check Errors?when Compiling
4. MapStruct processing speed is?overwhelmingly faster?than ModelMapper

Because of these advantages, I will user?MapStruct

Let’s take a look at basic function and different mapping strategies

Dependency Settings

If you use Lombok, Add “lombok-mapstruct-bunding”

Now, Create Mapper

UserMapper.java

@Mapper
public interface UserMapper{
    UserMapper INSTANCE = Mappers.getMapper(UserMapper.class);
UserEntity userDTOToEntity(UserDTO userDTO);
    UserDTO userEntityToDTO(UserEntity userEntity);
}        

Declare it as an interface,

The implant is automatically created in the?target

If DTO and Entity variable names are the same,

It’ll work

have to make Builder in UserEntity

DTO and Entity have the same variables

Now use the one you made before

Finally, let’s look at some mapping strategies

It’s on?UserMapper

Mapping Different Properties

Mapping?nick in DTO to nickname in Entity

Ignore properties

When you change DTO to an entity, if the value of the entity is not present in the DTO

DTO

String nick;
String name;
Entity
String nickname;
String name;
String Age;        

In this case, the null value is added to Entity.Age (DTO → Entity)

Use?ignore