relationship

问题 I have been working on this for quite few time but could not find a way to denote the relationship between a class and an interface that is implemented by class in an UML diagram. Can someone help me in the above problem? My interface and class has following relationship interface foo { void a(); void b(); } class goo : foo { public override void a() { //Code goes here } } Can you please tell me what to use in visual paradigm to show there relationship? 回答1: It is shown like inheritance. This

问题 I'm working on some wxpython widgets that integrate SQLalchemy, CRUD stuff. I've got a wx.ComboBox that lists the rows of a table linked by a relationship. class User(Base): __tablename__ = 'user' id = Column(Integer, primary_key=True) name = Column(String(250), nullable=False) class Category(Base): __tablename__ = 'category' id = Column(Integer, primary_key=True) name = Column(String(250), nullable=False) class Thing(Base): __tablename__ = 'thing' id = Column(Integer, primary_key=True)

问题 SQL Server 2008. I have a parent row with pk id 1. While blocking all other DB users (this is a cleanup operation so resource contention is not an issue), I would like to insert a new row, then take all of the child rows and change their fk column to the new row. With the below DDL for example, I would like to insert a new row and give all of the #chi.parid values a value of '3' so they would essentially now belong to the new row so the old one can be deleted. Help! create table #par ( parid

问题 I'm still having trouble searching for technologies that are stored in a separate table, where there is a relationship between the technology table (technol) and Project table through a table called projecttechnol. This is my log when I try to search for a project with a technology (tech1). Parameters: {"utf8"=>"✓", "client"=>"", "industry"=>"", "role"=>"", "technols"=>{"id"=>["", "1", ""]}, "business_div"=>"", "project_owner"=>"", "start_date_dd"=>"", "start_date_A"=>"", "start_date_B"=>"",

问题 This is mostly a design/efficiency question but I wanted to see if there was a preferred way to handle this in neo4j as opposed to how I would do it in a sql db. Right now I have 2 models - user and event . I also have a relationship between user and event to represent that they will attend the event. I want to figure out the best way to represent the admin of the event. In other words, I want to be able to query the events that are admined by a user. One way to do it is to create a new

问题 I'm using SQLAlchemy (0.9.4) in my Flask application. There are two tables with soft delete support in application. class A(SoftDeleteMixin, db.Model): id = db.Column(db.BigInteger, primary_key=True) b_id = db.Column(db.BigInteger, db.ForeignKey('b.id'), nullable=False) b = soft_delete_relationship('B.id', 'A.b_id') class B(SoftDeleteMixin, db.Model): id = db.Column(db.BigInteger, primary_key=True) parent_id = db.Column(db.BigInteger, db.ForeignKey('b.id')) parent = soft_delete_relationship

问题 I have two tables: Property (..., postcode_id, ...) Postcode (id, postcode, latitude, longitude) The relationship: class Property extends AppModel { public $belongsTo = array( 'Postcode' => array( 'className' => 'Postcode' ) ); class Postcode extends AppModel { public $hasMany = array( 'Property' => array( 'className' => 'Property' ) ); What I'd like to happen: Enter a postcode in the Property add form. Check entered postcode is in the Postcode table. If not, so some logic (possibly add it,

问题 Due to the Nature of the Question , searching for similar questions or articles is quite difficult because keywords have a wide range of meaning. So if there is a similar question, pardon me. The Problem . (Simplified) I have a table of users. ( Table User ) Each user Has his own assets (Table Asset Foreign key to user Id) 2 Users can be cooperators. Each user selects the assets he wants to share with the other. For use in this cooperation a Shared Group Is created containing the assets of

问题 I have two models: Page has many Sections. I'm not using nested resources because there's a third model also. In my page#show I have a link to create a new Section belonging to the current Page: <%= link_to 'New Section', new_section_path(:page_id => @page) %> And in my Section view's form I have: <%= form_for(@section) do |f| %> . . . <div class="field"> <%= f.label :title %><br /> <%= f.text_field :title %> </div> <%= f.hidden_field :page_id, :value => params["page_id"] %> <div class=

问题 I have a db modelled like this: User + id + email + password Profile + id + owner_id (FK user.id) + type_id (FK types.id) + address_id (FK addresses.id) + org_name + phone + email + url etc Postings + id + profile_id (FK profiles.id) + title + description Addresses + id + street + city + province_id (FK provinces.id) + country_id (FK countries.id) etc Countries + id + name Provinces + id + name + abbreviation + country_id I am trying to use Eloquent ORM to query a set of Postings from this