foreign-collection | 易学教程

Parsing with jackson and inserting same object to sqlite using ormlite android

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问题 I am parsing json data using Jackson from api call and trying to insert the data in sqlite using ormlite . For this i am using same model class. Here is my model classes public class Site { @DatabaseField(generatedId=true,columnName="ID") private int id; @DatabaseField(columnName="NAME") private String name; @ForeignCollectionField(eager=true) Collection<Visit> visits; Site() { } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return

Convert ForeignCollection to ArrayList - ORMLite, Gson and Android

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问题 I apologize if I'm not super clear with my explanation but I'll add to and edit this question for clarity if requested. I am developing an Android app which receives data through an external API and stores data locally using ORMLite. Prior to storing data locally and using ORMLite I had models which retrieved JSON from the server and parsed it via: Gson gson = new Gson(); String result = ApiClient.httpPost("/user_route"); User user = gson.fromJson(result, User.class); The User class was

Convert ForeignCollection to ArrayList - ORMLite, Gson and Android

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PostgreSQL array of elements that each are a foreign key

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问题 I am attempting to create a DB for my app and one thing I'd like to find the best way of doing is creating a one-to-many relationship between my Users and Items tables. I know I can make a third table, ReviewedItems , and have the columns be a User id and an Item id, but I'd like to know if it's possible to make a column in Users , let's say reviewedItems , which is an integer array containing foreign keys to Items that the User has reviewed. If PostgreSQL can do this, please let me know! If

ORMLite ForeignCollection: Must use ClosableIterator?

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问题 quick question about using ORMLite. I am trying to make sure that my implementation is correct. There's a part of the documentation that talks about closableIterators and how accessing this loads the LazyForeignCollection class and it needs to be closed (or read to the end) for the database connection to be closed: NOTE: Like with the Dao.iterator() method, the iterator returned by a lazy collection must be closed when you are done with it because there is a connection open to the database

ORMLite - force read objects to have same identity

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I'm reading a hierarchy of objects with ORMLite. It is shaped like a tree, parents have a @ForeignCollection of 0+ children, and every child refers to its parent with @DatabaseField(foreign=true) . I'm reading and saving the whole hierarchy at once. As I'm new to ORM in general, and to ORMLite as well, I didn't know that when objects with the same ID in the database are read, they won't be created as the actually same object with the same Identity , but as several duplicates having the same ID . Meaning, I'm now facing the problem that (let's say "->" stands for "refers to") A -> B -> C != C -

Problems with ORMLite and lazy collections

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问题 I am using ormlite in my android project. I have two classes @DatabaseTable(tableName = "usershows") public class UserShow { @DatabaseField(id = true) private Integer showId; @ForeignCollectionField(eager = false) private ForeignCollection<Episode> episodes; ... } @DatabaseTable(tableName = "episodes") public class Episode { @DatabaseField(id = true) private Integer episodeId; @DatabaseField(foreign = true) private UserShow show; ... } I am saving my UserShows objects like in example UserShow

Create table with Foreign Collection Field

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问题 I have this abstract class: DomainItem abstract public class DomainItem { @DatabaseField(generatedId = true) protected long id; @ForeignCollectionField(eager = false) protected ForeignCollection<ContentItem> contentItens; //getters and setters } ContentItem: abstract public class ContentItem { @DatabaseField(generatedId = true) protected long id; @DatabaseField(foreign = true) protected DomainItem domainItem; @DatabaseField() protected String content; //getters and setters } And these (no

Problems with ORMLite and lazy collections

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I am using ormlite in my android project. I have two classes @DatabaseTable(tableName = "usershows") public class UserShow { @DatabaseField(id = true) private Integer showId; @ForeignCollectionField(eager = false) private ForeignCollection<Episode> episodes; ... } @DatabaseTable(tableName = "episodes") public class Episode { @DatabaseField(id = true) private Integer episodeId; @DatabaseField(foreign = true) private UserShow show; ... } I am saving my UserShows objects like in example UserShow show = new UserShow(); userShowDao.create(show); for (Episode e: eps) { e.setShow(show); episodeDao

Deleting using ormlite on android?

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问题 I have a Client bean , @DatabaseField(columnName = "client_id",generatedId = true,useGetSet = true) private Integer clientId; @DatabaseField(columnName = "client_nom",useGetSet = true) private String clientNom; @DatabaseField(columnName = "city_id",foreign = true,useGetSet = true) private City city; and a City bean , @DatabaseField(columnName = "city_id",generatedId = true,useGetSet = true) private Integer cityId; @DatabaseField(columnName = "city_name",useGetSet = true) private String