composite-key

问题 Long time reader first time poster! I'm playing around with the boost::multi_index container stuff and have a rather in-depth question that hopefully a boost or C++ container expert might know (my knowledge in C++ containers is pretty basic). For reference, the boost documentation on composite keys can be found here: boost::multi_index composite keys. When using a composite key, the documentation states that "Composite keys are sorted by lexicographical order, i.e. sorting is performed by the

问题 I've followed the instructions here, installing the composite_primary_keys gem via sudo gem install composite_primary_keys That worked fine. Now when I add the following to my model set_primary_keys :user_id, :group_id and I get undefined method `set_primary_keys' for #<Class:0x1043bfe20> Also, using multiple primary keys in a migration as described here has no effect. Any ideas why this might not be working and how to make it work? Note: I do not want a speech on why I should not be using

问题 Can anyone help me with the composite key? I am not able to function properly. function init_click_handlers(){ $(".button-endereco").click(function(e) { var fcodigo = $(this).closest("tr").data("codigo"); var fcodigopessoa = $(this).closest("tr").data("codigopessoa"); var map = {codigo: $(this).closest("tr").data("codigo"), codigopessoa: $(this).closest("tr").data("codigopessoa")}; $.get( "update ", { codigo: fcodigo codigopessoa: fcodigopessoa }, function (data) { $("#endereco-modal").find("

问题 Following this link I would like to use OneToMany instead ManyToMany annotation, having middle class with composite key in it using Ebean. I have this error: java.lang.RuntimeException: Error reading annotations for models.SoftwareTagPk This is my SoftwareTagPk class: @Embeddable public class SoftwareTagPk implements Serializable { @ManyToOne private Tag tag; @ManyToOne private Software software; ... } And SoftwareTag class: @Entity public class SoftwareTag extends Model { @EmbeddedId private

问题 I have the following existing DB schema, which I'd like to recreate with Java and plain JPA annotations (using hibernate as provider, so hibernate specific annotations would work as a last resort): CREATE TABLE users ( user_id NUMBER NOT NULL -- pk ); CREATE TABLE userdata_keys ( userdata_key_id NUMBER NOT NULL, -- pk key VARCHAR2(128) NOT NULL ); CREATE TABLE users_userdata ( user_id NUMBER NOT NULL, -- fk users.user_id userdata_key_id NUMBER NOT NULL, -- fk userdata_keys.userdata_key_id

问题 I'm having trouble getting a composite primary key and foreign keys working in JPA 2/Hibernate. I'm trying to create a simple scenario with countries and provinces: Country Entity: @Entity @Table(name = "country") public class Country extends DomainObjectBase implements Serializable { @Id @Basic(optional = false) @Column(name = "code") private String code; @Basic(optional = false) @Column(name = "name") private String name; @OneToMany(cascade = CascadeType.ALL, mappedBy = "country") private

问题 Given a simple parent -> child (CK,CK) setup like this .. I am having trouble with adding a new child object and it getting the parent reference. So I would add the object in such a way .. var parent = new Parent{ Children = new List<Child>{ new Child{ Other = otherReference } } }; Or even adding it using the Add() method... parent.Children.Add(new Child { Other = other }); The reference to the Parent does not get pushed through. It just ends up as a null property. I get the following

问题 Basically what I am trying to achieve is I have three tables, one parent will always have an entry in it and only one of the other two tables will be populated. The complexity that I am dealing with is that the primary key for the tables is the combination of two fields ParentTable ----------- UniqueID OwnerID [Some more fields] ChildTable1 ----------- UniqueID OwnerID [Some more fields] ChildTable2 ----------- UniqueID OwnerID [Some more fields] I was wondering if anyone has any suggestions

问题 So I asked this question yesterday, but the goal posts have changed and the question is different: Hibernate / JPA Collection of Elements with Many to Many relationship? I want to know if it's possible to create entities that will model my required relationship so that Hibernate will create my schema when I fire up my application. The relationship I want looks like this: 1 http://a8.sphotos.ak.fbcdn.net/hphotos-ak-ash4/417593_10150594114269218_505554217_8657377_1475865815_n.jpg The thing is

问题 I am sure I am not the first who has composite unique keys in tables and who wants to validate them. I do not want to invent the bicycle so I ask here first. I have several tables that have 'id' columns as primary keys and two other columns as unique composite keys. It would be nice to have a validation rule to check that the submitted entry is unique and display a validation error if it is not. In Cakephp it could be done by a custom validation rule. I am pretty sure somebody has created