jointable

问题 I have the following models: Client.rb has_many :establishments accepts_nested_attributes_for :establishments has_many :addressess, through: :establishments accepts_nested_attributes_for :addresses Establishment.rb belongs_to :address belongs_to :client Address.rb has_many :establishments On the show view of the Client I created a <%= link_to "New Establishment", new_client_address_path(@client)%> in order to create a new Address record and a new Establishment to the client. On the

问题 select consultas.id as a, consultas.clasificacion as cl, consultas.paciente_id as b, consultas.created,imc_kg_m2 as im from consultas join signos_sintomas on signos_sintomas.consulta_id = consultas.id where paciente_id in (select pacientes.id from pacientes where pacientes.id < 30 order by pacientes.id desc) and consultas.created in (select consultas.created from consultas order by consultas.created asc ) and imc_kg_m2 is not null ; +-----+----+----+---------------------+------+ | a | cl | b

问题 I'm using ROOM for my project. But I'm having trouble for joining between tables, because the tables have a same name fields. for example, my project has tree tables, "word" & "favorite" & "bookmark", which has a same name fields. 1- word @Entity(tableName = "word") public class Word { @NonNull @PrimaryKey(autoGenerate = true) private int id; @NonNull private String title; private String mean; private String pronunciation; // Getter and Setter } 2- favorite @Entity(tableName = "favorite",

问题 I'm using ROOM for my project. But I'm having trouble for joining between tables, because the tables have a same name fields. for example, my project has tree tables, "word" & "favorite" & "bookmark", which has a same name fields. 1- word @Entity(tableName = "word") public class Word { @NonNull @PrimaryKey(autoGenerate = true) private int id; @NonNull private String title; private String mean; private String pronunciation; // Getter and Setter } 2- favorite @Entity(tableName = "favorite",

问题 I am still a learner of Rails, and am making a simulation game of Google Adwords for training usage. Inside the game (I may only explain the related part of this question), I have three models, Adgroup (called KeywordAdgroup in my code), Keyword, AdgroupKeyword , and also a Game model that has a game_id in it. The relationship of the three models is a has_many through: assciation, which Adgroup has many Keywords through AdgroupKeyword, and Keyword has many Adgroups through AdgroupKeyword. Now

问题 This really has me stumped. I have four tables in the database, and unfortunately the person who designed this table didn't create referential constraints. So, there is no navigation properties available. Four tables are: CiscoPhoneReport ApplicationSummary CSQActivityReport CallDistributionSummary The idea is that for each PhoneReportID in CiscoPhoneReport, there is one ApplicationSummary , three CSQActivityReport , and three CallDistributionSummary . I want the output as below in JSON

问题 In this example from the book: https://book.cakephp.org/3.0/en/orm/associations.html#using-the-through-option class StudentsTable extends Table { public function initialize(array $config) { $this->belongsToMany('Courses', [ 'through' => 'CoursesMemberships', ]); } } class CoursesTable extends Table { public function initialize(array $config) { $this->belongsToMany('Students', [ 'through' => 'CoursesMemberships', ]); } } class CoursesMembershipsTable extends Table { public function initialize

问题 Extending my previous question on stack-overflow. I have four tables: A <--- Relation ---> B ---> Category (So the relation between A and B is n to n, where the relation between B and Category is n to 1) Relation stores 'Intensity' of A in B. I need to calculate the intensity of A in each Category and find the Maximum result. It is achievable using: A.objects.values( 'id', 'Relation_set__B__Category_id' ).annotate( AcIntensity=Sum(F('Relation_set__Intensity')) ).aggregate( Max(F('AcIntensity'

问题 i'm working with doctrine & i have some problem in many-to-many self referencing which has some extra fields. lets describe my scenario : i have a table named Drug , drugs can have conflicts with each other & this conflicts may appear under some conditions & may have some solutions. i've read doctrine documents about many-to-many relations & it's mentioned that it's not good for JoinTable to have some extra fileds. so what's the best solution for this problem? here is my solution, but i'm not

问题 I don't know since when this is possible, but I just created composite keys the way I always wanted: No @EmbeddedId and no @IdClass required!! Spring 4.0.0.M3 Hibernate 4.3.0.Beta4 JPA 2.1 User.java : @Entity public class User { @Id ... @OneToMany(mappedBy="user", cascade=CascadeType.ALL, orphanRemoval=true) private List<GroupUser> groupUsers; } Group.java : @Entity public class Group { @Id ... @OneToMany(mappedBy="user", cascade=CascadeType.ALL, orphanRemoval=true) private List<GroupUser>