one-to-many

问题 If I've, in a single entity A, multiple relations (many to one) towards an entity B (annotated with one to many)? Do I've to put an annotation for each occurrence of A in B? Example: Entity A: @Entity @Table(name = "patient") @TableGenerator(name = "tab_gen_pa", initialValue = 30000, allocationSize = 1) public class Patient implements Serializable, Comparable<Patient> { @ManyToOne @Column(name = "birth_region") private Region birthRegion; @ManyToOne @Column(name = "birth_province", length = 2

问题 These two questions answered many of my questions, but I am still struggling to think about in real scenario! Taking an example from the references. Assume I have one Order and Multiple Items associated with it. Now assume One Item can have one Returns but one Returns can have multiple Items. What I understood is, Order to Items will be One to Many Relation . Since I need to get Order of an Item, I will create column 'order_fk' in Item table to get it. //Order entity @OneToMany @JoinColumn

问题 I have an Order mapping with many OrderItems. The mapping correctly saves both the Order and OrderItems to the database when I do a save on just the Order, but when I reload that order, the List of OrderItems that the order contains is filled with null values (for all the othe order items in the table) until it reaches the OrderItem that has the Order's foreign key. So the total count of null order items is the row count of the OrderItems table, (sans the actual order items that are related

问题 I've done this before, I don't know why this is throwing me errors. These are my classes: public class ChatModel { public int ChatID { get; set; } public virtual List<ChatModel> Messages { get; set; } } public class MessageModel { public int MessageID { get; set; } public string Issuer { get; set; } public string Message { get; set; } public ChatModel Chat { get; set; } } And this is what I'm doing through Fluent API: modelBuilder.Entity<ChatModel>() .HasMany<MessageModel>(c => c.Messages)

问题 how to overwrite a one to many records in odoo through odoo API ? This is my create json, what change I want to make in this json to overwrite(Replace) the existing? lead_product_ids ., now it is appending the records. Now i am getting multiple when update the records in this code instead of 0,0 what is the value, Please help. { "jsonrpc": "2.0", "params": { "model": "crm.lead", "method": "create", "args": [ { "type": "opportunity", "name": "Fgtrdhjkkmmmmmmmm1290", "pro_info": "Fggggggg

问题 I'm trying to make 3 entities (Item, Agree, Disagree) with following relations. Item one-to-many Agree Item one-to-many Disagree But only one relation (declared later) out of two has made. Here're my .yml files. Entities\Item: type: entity fields: id: type: integer id: true generator: strategy: AUTO oneToMany: agrees: targetEntity: Agree mappedBy: items oneToMany: disagrees: targetEntity: Disagree mappedBy: items Entities\Agree: type: entity fields: id: type: integer id: true generator:

问题 Let's say a patient makes many visits. I want to write a query that returns distinct patient rows based on their earliest visit. For example, consider the following rows. patients ------------- id name 1 Bob 2 Jim 3 Mary visits ------------- id patient_id visit_date reference_number 1 1 6/29/14 09f3be26 2 1 7/8/14 34c23a9e 3 2 7/10/14 448dd90a What I want to see returned by the query is: id name first_visit_date reference_number 1 Bob 6/29/14 09f3be26 2 Jim 7/10/14 448dd90a What I've tried

问题 Hello again beloved overflowers, I hope we have some brains available for the picking; as always it's greatly appreciated! :) I have an Events table, which can be assigned multiple categories (used as tags): I then have the Categories (stores each tag) and Events_Categories (linking table) **Events** | id | event_name | +------------+ + 1 | Basketball + 2 | Children Charity Ball + 3 | Bowling Charity Event **Event_Categories** (Stores Tags / Categories) | id | name | +------------+ + 1 |

问题 I am able to validate an entity using the code entity.entityAspect.validateEntity() . However, this does not validate navigation properties. My entiy has one-to-one and one-to-many relationship with out entities. I want to validate both the entity and its navigational properties. How can i do this with breeze? EDIT I have a class public class ClassA{ public int id{get; set;} public List<ClassB> navigationArray{get; set;} } public class ClassB{ public int myClass {get; set;} [Foreign("myClass"

问题 I have a problem with deleting OneToMany and ManyToOne on hibernate. I guess the problem is that I have two parents for a single child. This is how I got it Persona Rol Pais id id id name name name Pais Rol As you can see, the person (persona) is related to the role (rol) and the country (pais). My entities are like this: Person public class Persona implements java.io.Serializable { @ManyToOne(fetch=FetchType.LAZY) @JoinColumn(name="Pais", nullable=false) public Pais getPais() { return this