one-to-many

Anyone has good advise on how to implement one-to-many mapping for SQLite using ContentProvider ? If you look at Uri ContentProvider#insert(Uri, ContentValues) you can see that it has ContentValues param that contains data to insert. The problem is that in its current implementation ContentValues does not support put(String, Object) method and class is final so I cannot extend it. Why it is a problem? Here comes my design: I have 2 tables which are in one-to-many relationship. To represent these in code I have 2 model objects. 1st represents the main record and has a field that is a list of

I have the following entities: TEAM @Entity @Table public class Team { [..] private Set<UserTeamRole> userTeamRoles; /** * @return the userTeamRoles */ @OneToMany(cascade = { CascadeType.ALL }, mappedBy = "team", fetch = FetchType.LAZY) public Set<UserTeamRole> getUserTeamRoles() { return userTeamRoles; } /** * @param userTeamRoles * the userTeamRoles to set */ public void setUserTeamRoles(Set<UserTeamRole> userTeamRoles) { this.userTeamRoles = userTeamRoles; } } and USER_TEAM_ROLE @Entity @Table(name = "user_team_role") public class UserTeamRole { @ManyToOne(cascade = CascadeType.MERGE, fetch

I have the following model public class PageConfig : Base { // Properties Etc.. public ICollection<Image> ScrollerImages { get; set; } } My approach is to bind using a junction table { PageConfigID, ImageID }. In my model binder i tried the following.. modelBuilder.Entity<PageConfig>() .HasMany(x => x.ScrollerImages) .WithMany() .Map(x => { x.ToTable("junc_PageConfigScrollerImages"); x.MapLeftKey("PageConfigID"); x.MapRightKey("ImageID"); }); Which results in a null collection of images. How can i bind these Images to the PageConfig model? EDIT Most of the problem was due to user error. jic

i tried the whole day to get this working. I learned a lot about EF's Fluent API (e.g. this is an excellent article), however i had no success. I have three Entities: public class Address { [Key] public virtual int AddressId { get; set; } public virtual string AddressString { get; set; } } public class User { [Key] public virtual int UserId { get; set; } public virtual ICollection<Address> Addresses { get; set; } } public class House { [Key] public virtual int HouseId { get; set; } public virtual Address Address { get; set; } } and tried all combinations of HasMany, HasOptional, WithOptional,

Coming from another question of mine where I learnt not to EVER use db queries within loops I consequently have to learn how to fetch all the data in a convenient way before I loop through it. Let's say I have two tables 'scales' and 'items'. Each item in items belongs to one scale in scales and is linked with a foreign key (scaleID). I want to fetch all that data into an array structure in one query such that the first dimension are all the scales with all the columns and nested within, all items of one scale all columns. Result would be something like that: scale 1, scaleParam1, scaleParam2,

I've those 2 entities Class A { @OneToMany(mappedBy="a") private List<B> bs; } Class B { @ManyToOne private A a; private String name; } 1) I would like to construct a query that says get all A's that have at least one B with name ="mohamede1945" 2) I would like to construct a query that says get all A's that don't have any B with name = "mohamede1945" Could anyone help me? You can use the ANY and ALL constructs to filter the subquery. So something like 1. FROM A aEntity WHERE 'mohamede1945' = ANY (SELECT bEntity.name FROM aEntity.bs bEntity) 2. FROM A aEntity WHERE 'mohamede1945' <> ALL

I am trying to get my @OneToMany and @ManyToOne relationships correct. Class 1: @Entity public class IdeaProfile { @Id @GeneratedValue private int ideaProfileId; private String name; Date dateConcieved; @OneToOne @JoinColumn(name="statusCode") private Status status; @OneToMany(fetch=FetchType.EAGER, targetEntity=Pitch.class, cascade=CascadeType.ALL) @JoinColumn(name = "ideaProfileId") private List<Pitch> pitchs; ....getters and setters.... Class2: @Entity public class Pitch { @Id @GeneratedValue private int id; @ManyToOne @JoinColumn(name = "ideaProfileId") private IdeaProfile ideaProfile;