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Questions tagged [mapper]

The mapper is the first step in MapReduce framework, a component of a larger scalable, parallel-izable algorithm.

Maps input key/value pairs to a set of intermediate key/value pairs.

Maps are the individual tasks which transform input records into a intermediate records. The transformed intermediate records need not be of the same type as the input records. A given input pair may map to zero or many output pairs.

The most common map reduce framework is Apache Hadoop.

See also MapReduce Wiki.

653 questions
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why it' take's t.m.s.mapper.ClassPathMapperScanner and o.m.s.mapper.ClassPathMapperScanner

@SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class,args); } } 59:37.637 [main] WARN t.m.s.mapper.ClassPathMapperScanner - No MyBatis mapper was found…
monlen
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MapStruct can't find property both in source and target

Source Class looks like: Data @Accessors(chain = true) @Validated public class OAuth2ClientCreateRequest { @NotNull Data data; @lombok.Data @Accessors(chain = true) public static class Data { @Pattern(regexp =…
iamcrypticcoder
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MyBatis Mapper with several SQLs in one method using DB2

I need to execute several SQL statements in one MyBatis Mapper method, because the SQLs are dependend on each other. With H2, this is no problem: @Delete("DELETE FROM DETAIL_TABLE " + " WHERE MASTER_ID IN " + " …
Thorsten Kitz
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ModelMapper: Map object which has nested collection to flat object

I have a class with a nested list and I want to map this object into list of flat objects using ModelMapper. public class A { private String str; private String str2; private List blist; // Setters and getters } public class B { …
Sara Selim
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How to do addition in mapper using snaplogic?

I want to do the addition of two input using mapper and send the data dynamically from the Postman in the form of JSON. So, want to add that data coming from the Postman.
Sahil Malhotra
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I can't add mapstruct in my Spring project

I try to add mapstruct mapper in my Spring project. I have a User entity. I need to show a list of users in the admin panel. For this, I did DTO UserForAdmin, mapper UserMapper and rest controller AdminRestController. When I try to get UserMapper I…
Alexander Lopatin
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doctrine 2 join problem [with xml mappers]

I try to join two tables but get stuck writing correct xml mappers (setup and entity access tested and works fine) Based on MySQL, Doctrine 2.0.4 and ZF-1.11 I am using the XmlDriver( 'path\to\mappers ); Query $query = $em->createQueryBuilder() …
timt
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Spring mapper with Java Map

I've been struggling with the following issue for a few hours now, and I can't figure it out how to make it work: Spring mapper, in order to convert DB response to DTO: @Mapper(componentModel = "spring") public interface ITeamResponseToDtoMapper { …
user3819295
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how to use a child mapper method which extends a parent mapper

I'm trying to call the child mapper method by a flexible case But in this case, we don't know which method will be called even it extends parent mapper. [spring boot framework with mybatis] // ParentMapper public interface ParentMapper { //…
kokojustin
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Multiple Database connection for mybatis and spring boot application using config.xml

i need to connect to multiple databases configured in my config.xml file config.xml
Mohit Anand
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resultMap alway report "must match constructor, id, result, asssociation, collection, discriminator"

My mybatis mapper file always report the following error message: The content of element type "resultMap" must match "(constructor?,id*,result*,association*,collection*,discriminator?)". and here is my resultMap config:
wang alex
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Mapstruct self defined mapper AND automatically generated one

I understand Mapstruct allows me to define my own mapper logic, I am doing it like this: @Mapper(componentModel = "spring") public abstract class ProjectMapper { public ProjectInfo map(ProjectEntity projectEntity) { ProjectInfo…
Christopher
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What does the shuffling phase actually do?

What does the shuffling phase actually do? Possibility - A As shuffling is the process of bringing the mapper o/p to the reducer o/p, it just brings the specific keys from the mappers to the particular reducers based on the code written in…
Surbhi Jain
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Why conditioning in IIB Mapping Node invalidates the response XML?

I've been using an If condition in IIB Mapping node on request's boolean attribute Flag that maps to messageA attribute in response. Assignment is done in case Flag evaluates as true. There is another For Each which performs deep copy of a list and…
Muhammad Faizan Uddin
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