Questions tagged [multi-mapping]
25 questions
1
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1 answer
Report on a multimap by producing a new map of each key mapped to the count of elements in its collection value
Imagine a multimap tracking persons, each of whom has a list of assigned tasks.
Map< Person , List< Task > > personToTasks =
Map.of(
new Person( "Alice" ) , List.of( new Task( "a1" ), new Task( "a2") ) ,
new Person( "Bob" ) …
Basil Bourque
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4 answers
Invert a Map with redundant values to produce a multimap
Given a map such as this where we have a frequency count per day-of-week for a year:
Map.of(
DayOfWeek.MONDAY , 52 ,
DayOfWeek.TUESDAY , 52 ,
DayOfWeek.WEDNESDAY, 53 ,
DayOfWeek.THURSDAY , 53 ,
DayOfWeek.FRIDAY , 52 ,
…
Basil Bourque
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1 answer
Dapper Resolve Invalid cast exception
I am using Dapper with MySql to get a list of uTeacher with multi-mapping but I can't get it to work! I get Invalid Cast exception from Int32 to uDepartement class and other classes!!
( DataException: Error parsing column 33 (Department=1 - Int32)…
iProg
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Using multiple index mapping in Elasticsearch
I`m using version 2.4.5 of elasticsearch(I need this version in project). I`ve the next lines of code:
result = jestClient.execute(new PutMapping.Builder(indexName, Types.USER, userMappingSource).build());
...
result = jestClient.execute(new…
Hleb Shchepilin
- 11
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2 answers
How do I return one-to-many records in a specific order with Dapper and multi-mapping?
From Github:
Dapper allows you to map a single row to multiple objects. This is a
key feature if you want to avoid extraneous querying and eager load
associations.
Example:
Consider 2 classes: Post and User
> class Post {
> public int Id {…
johnny
- 19,272
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Multimapping in Dapper Without Custom SQL
Is there a way to use multimapping in Dapper in a generic way, without using custom SQL embedded in C# code?
See for example
Correct use of Multimapping in Dapper
Is there a generic way to query the data from 2 related entities, where common fields…
Miha
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Can Dapper load a Multi-Mapping result when a join table is in use?
I have an application object which has many connection objects. This is great in the .Net world but unfortunately the join is managed via a join table with a composite key. Is it possible to map this in dapper using a multi-mapping approach?
For now…
Mark Redfern
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Add elements from a 2d ArrayList to a multimap in java
I want to add elements from a 2D arraylist to a multimap but cant find an equivalent method to getOrDefault as in case of hashmaps.
I tried using the guava library but seems like it does not have any deafult method for doing the same.
can someone…
0
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2 answers
Dapper MultiMapping for 3 One-To-One relationships
I have 3 tables in Sql Server, one-to-one relationships.
The key is Indice in all 3 tables.
The 3 entities:
public class Client
{
public int Indice { get; set; }
public string Name { get; set; }
public string Surname { get; set; }
…
Kiquenet
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1 answer
Dapper error when deserializing to complex object
I'm trying to convert a "flat" query into a complex object. The query returns custom_height and custom_width which I would like to be a child object off of the main Panel object being serialized. When I attempt to use splitOn to achieve this, I am…
Joe Phillips
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