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UML ternary and reflexive association together


UML ternary and reflexive association together

By : DanDaMan
Date : November 15 2020, 06:54 AM
This might help you You have two associations between your ternary and your User class, one association with the Job class and a dependency on the Feedback class: this is definitely not a ternary.
MCD and MLD are two abbreviations for Merise diagrams (largely used in France in the 90's, have a look at the French Wikipedia), this is not UML compliant, here is why. These diagrams respectively represent a conceptual view and a logical (usually relational) view of the informations. Merise is not at all object-oriented, while UML is purely object-oriented.
code :


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One-To-Many reflexive association INSERT data

One-To-Many reflexive association INSERT data


By : user2208184
Date : March 29 2020, 07:55 AM
This might help you I have a table with One-To-Many reflexive association. , i found out the solution, tell me what do you think thanks!
code :
-- CmsCategories: Disable constraint one-to-many reflexive association to add first row
    ALTER TABLE dbo.CmsCategories
    NOCHECK
    CONSTRAINT
    FK_CmsCategories_ParentOf;

    ---- CmsCategories: Insert first row - Root value
    INSERT INTO dbo.CmsCategories
    (Title, MetaDescription, MetaKeyword, Summary, IsPublished, ParentOf)
    VALUES
    ('Homepage','Homepage','Homepage','Homepage',1,0);

    -- CmsCategories: Enable constraint one-to-many reflexive association
    ALTER TABLE dbo.CmsCategories
    CHECK
    CONSTRAINT
    FK_CmsCategories_ParentOf;
HQL with reflexive association doesn't work

HQL with reflexive association doesn't work


By : Espen Benoni
Date : March 29 2020, 07:55 AM
may help you . You're using the same column (categoryId) to uniquely identify a category, and to reference the parent category. This can't possibly work, since all categories would obviously have themselves as parent. You need another column to hold the parent category ID:
code :
@Id
@SequenceGenerator(name = "CategoryIdGenerator", sequenceName = "CategorySeq")
@GeneratedValue(strategy = GenerationType.AUTO, generator = "CategoryIdGenerator")
@Column(name = "categoryId") // not necessary, but makes things clearer
public long getCategoryId() {
    return categoryId;
}

// optional must be true: some categories don't have a parent
@ManyToOne(optional = true, fetch = FetchType.EAGER) 
// insertable at least must be true if you want to create categories with a parent
@JoinColumn(name = "parentCategoryId", nullable = true)
public Category getParent() {
    return parent;
}
Rails 4 Reflexive Many-to-Many Association

Rails 4 Reflexive Many-to-Many Association


By : Riya Saini
Date : March 29 2020, 07:55 AM
will help you I found the answer and I hope it can be helpful for everyone with same kind of problem.
In short, I've got the answer from Ryan Bates' railscasts.com website. More specificly, the answer were found here.
code :
class NestedParam < ActiveRecord::Base
  belongs_to :api_param
  belongs_to :child_param, class_name: 'ApiParam'
end

class ApiParam < ActiveRecord::Base
  has_many :nested_params
  has_many :child_params, :through => :nested_params
  has_many :parent_api_params, :class_name => "NestedParam", :foreign_key => "child_param_id"
  has_many :parent_params, :through => :parent_api_params, :source => :api_param
end

ActiveRecord::Schema.define(version: 20140910175658) do

  create_table "api_params", force: true do |t|
    t.string   "name"
    t.string   "description"
    t.boolean  "required",    default: true
    t.boolean  "struct",      default: false
    t.string   "type"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  create_table "nested_params", force: true do |t|
    t.integer  "api_param_id"
    t.integer  "child_param_id"
    t.boolean  "required"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  add_index "nested_params", ["api_param_id"], name: "index_nested_params_on_api_param_id"
  add_index "nested_params", ["child_param_id"], name: "index_nested_params_on_child_param_id"
end
Reflexive Transitive Closure in Alloy in Ternary Operator

Reflexive Transitive Closure in Alloy in Ternary Operator


By : Natalie
Date : March 29 2020, 07:55 AM
it should still fix some issue Your misunderstanding comes from the type you give to fields.
In your example the field root is not of type Node but of type BinaryTree -> Node as it relates a BinaryTree to a Node.
code :
Node in BinaryTree . BinaryTree -> Node . *(Node -> Node + Node -> Node )
Node in BinaryTree . BinaryTree -> Node . *(Node -> Node)
Node in BinaryTree . BinaryTree -> Node . (Node -> Node)
Node in Node .(Node->Node) 

Node in Node
Order data with reflexive association

Order data with reflexive association


By : adam benjbara
Date : March 29 2020, 07:55 AM
it fixes the issue THis could be a solution to your question, without using recursive CTE
code :
DECLARE @T TABLE (IdTech INT, IdTechFK INT, Name VARCHAR(255))
INSERT INTO @T VALUES
(1, NULL, 'FRT'),
(2, 1, 'FRT_1'),
(3, 1, 'FRT_2'),
(4, NULL, 'GSC filters'),
(5, 4, 'GSC filters_1'),
(6, 4, 'GSC filter_2'),
(7, 1, 'FRT_3'),
(8, 1, 'FRT_4'),
(9, NULL, 'Power Control')

SELECT a.IdTech, a.IdTechFK, a.Name
FROM (
SELECT m.IdTech, m.IdTechFK, m.Name, m.IdTech AS r FROM @T AS m
WHERE m.IdTechFK IS NULL
UNION ALL
SELECT  c.IdTech, c.IdTechFK, c.Name, c.IdTechFK AS r FROM @T AS c
WHERE   c.IdTechFK IS NOT NULL) AS a
ORDER BY a.r, idtech, IdTechFK
+-------+---------+--------------+
|IdTech |IdTechFK |Name          |
+-------+---------+--------------+
|1      |NULL     |FRT           |
|2      |1        |FRT_1         |
|3      |1        |FRT_2         |  
|7      |1        |FRT_3         |
|8      |1        |FRT_4         |
|4      |NULL     |GSC filters   |  
|5      |4        |GSC filters_1 |
|6      |4        |GSC filter_2  |
|9      |NULL     |Power Control |
+-------+---------+--------------+
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