Ich glaube, dass es entweder an Ihrem toten einfachen Konverter liegt oder vielleicht daran, wie die Items-Entität definiert ist (Ich habe boolean verwendet für ist ausgeschlossen und es scheint ohne den Konverter gut zu funktionieren) .
Das verwendet meine Version der Items Entity:-
@Entity(foreignKeys = @ForeignKey(entity = Category.class,parentColumns = "id", childColumns = "category", onDelete = CASCADE))
public class Items {
@PrimaryKey(autoGenerate = true)
private long id;
private String category;
private boolean isexcluded;
public void setCategory(String category) {
this.category = category;
}
public void setId(long id) {
this.id = id;
}
public void setIsexcluded(boolean isexcluded) {
this.isexcluded = isexcluded;
}
public String getCategory() {
return this.category;
}
public long getId() {
return this.id;
}
public boolean isIsexcluded() {
return this.isexcluded;
}
}
zusammen mit einem Kategorie-DAO von:-
@Dao
interface CategoryDAO {
@Query("SELECT * FROM Category")
List<Category> getAllcategories();
@Query("SELECT DISTINCT Category.* " +
"FROM CATEGORY " +
"INNER JOIN ITEMS ON category.id = Items.category " +
"WHERE isexcluded = 0 " +
"ORDER BY lower(category.name)")
List<Category> getSpeacial();
@Query("SELECT DISTINCT Category.* " +
"FROM CATEGORY " +
"INNER JOIN ITEMS ON category.id = Items.category " +
"WHERE isexcluded = 0 " +
"ORDER BY lower(category.name)")
List<CatViewWithItemList> getSpeacial2();
@Insert
public long[] insertCategory(Category... Category);
}
zusammen mit
new Thread(new Runnable() {
@Override
public void run() {
//mRoomDB.categoryDao().insertCategory(initialCategories());
//mRoomDB.itemsDAO().insertItem(initialItems());
List<Category> categoryList = mRoomDB.categoryDao().getAllcategories();
List<Items> itemsList = mRoomDB.itemsDAO().getAllItems();
for (Category c: categoryList) {
Log.d("CATEGORY","Category is " + c.getName() + " refrence is " + c.getId());
}
for (Items i: itemsList) {
Log.d("ITEM","Item is " + i.getId() + " Category reference is " + i.getCategory() + " Is Excluded is " + Boolean.toString(i.isIsexcluded()));
}
List<Category> categoryList2 = mRoomDB.categoryDao().getSpeacial();
for (Category c: categoryList2) {
Log.d("CATEGORY2","Category is " + c.getName() + " reference is " + c.getId());
}
List<CatViewWithItemList> catViewWithItemLists = mRoomDB.categoryDao().getSpeacial2();
for (CatViewWithItemList cvwil: catViewWithItemLists) {
Log.d("CATVIEWITEM","Category = " + cvwil.myCat.getId() + " ID = " + cvwil.ItemList.get(0).getId() + " IsExcluded = " + Boolean.toString(cvwil.ItemList.get(0).isIsexcluded()));
}
}
}).start();
und mit :-
public class CatViewWithItemList {
@Embedded
public Category myCat;
@Relation(parentColumn = "id",
entityColumn = "category")
public List<Items> ItemList;
}
Dann ist das Ergebnis (Teil eins die zugrunde liegenden Daten (oh, also kann ich den dritten nicht buchstabieren :))):-
2018-12-19 21:47:05.376 2109-2125/? D/CATEGORY: Category is firstname refrence is a
2018-12-19 21:47:05.377 2109-2125/? D/CATEGORY: Category is secondname refrence is b
2018-12-19 21:47:05.377 2109-2125/? D/CATEGORY: Category is thridname refrence is c
2018-12-19 21:47:05.377 2109-2125/? D/ITEM: Item is 1 Category reference is a Is Excluded is false
2018-12-19 21:47:05.377 2109-2125/? D/ITEM: Item is 2 Category reference is c Is Excluded is false
2018-12-19 21:47:05.377 2109-2125/? D/ITEM: Item is 3 Category reference is null Is Excluded is false
2018-12-19 21:47:05.377 2109-2125/? D/ITEM: Item is 4 Category reference is b Is Excluded is false
2018-12-19 21:47:05.377 2109-2125/? D/ITEM: Item is 5 Category reference is b Is Excluded is true
2018-12-19 21:47:05.378 2109-2125/? D/ITEM: Item is 6 Category reference is null Is Excluded is true
und dann die beiden Ergebnissätze :-
2018-12-19 21:47:05.379 2109-2125/? D/CATEGORY2: Category is firstname reference is a
2018-12-19 21:47:05.380 2109-2125/? D/CATEGORY2: Category is secondname reference is b
2018-12-19 21:47:05.380 2109-2125/? D/CATEGORY2: Category is thridname reference is c
2018-12-19 21:47:05.382 2109-2125/? D/CATVIEWITEM: Category = a ID = 1 IsExcluded = false
2018-12-19 21:47:05.382 2109-2125/? D/CATVIEWITEM: Category = b ID = 4 IsExcluded = false
2018-12-19 21:47:05.382 2109-2125/? D/CATVIEWITEM: Category = c ID = 2 IsExcluded = false
Zusätzlich
Ich glaube, dass Ihr Problem nicht mit der Abfrage, sondern mit der CatViewItemList zusammenhängt , indem Sie die Artikelliste mit allen Artikeln füllen, die sich auf die Kategorie beziehen, unabhängig von / nach der Abfrage (auch bekannt als Einbetten der Artikelliste in die Kategorie). Das hat mich verwirrt, da Sie nur das spezifische verwandte Element wirklich wollen (ich habe gerade den 1. Platz in meinem Code genommen), z. cvwil.ItemList.get(0).isIsexcluded() und das Glück war, dass 4 vor 5 kommt, sodass isexcluded als falsch angezeigt wird.
Ich glaube, dass Sie dies vielleicht von den Gegenständen aus angehen sollten, indem Sie der Kategorie beitreten, z. so etwas wie
SELECT *
FROM Items
JOIN Category ON Items.category = category.id
WHERE Items.isexcluded = 0
ORDER BY category.name ASC;
Ich habe den Code auf gitHub aktualisiert, um dies zu tun (beachten Sie, dass ich die Category-Tabelle so geändert habe, dass sie einen eindeutigen Spaltennamen von categoryid hat eher als id.)
Die Ergebnisse sind jetzt (beachten Sie, dass eine weitere Kategorie und 2 weitere Elemente in umgekehrter Reihenfolge hinzugefügt wurden, dh das erste Element (ID 7) wurde als wahr ausgeschlossen, dann ist die ID 8 falsch):-
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/CATEGORY: Category is firstname Category ID is a
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/CATEGORY: Category is secondname Category ID is b
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/CATEGORY: Category is thirdname Category ID is c
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/CATEGORY: Category is fourthname Category ID is d
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 1 Category reference is a Is Excluded is false
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 2 Category reference is c Is Excluded is false
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 3 Category reference is null Is Excluded is false
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 4 Category reference is b Is Excluded is false
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 5 Category reference is b Is Excluded is true
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 6 Category reference is null Is Excluded is true
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 7 Category reference is d Is Excluded is true
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 8 Category reference is d Is Excluded is false
2018-12-20 21:39:56.972 9136-9160/so53839431.so53839431roomrelationship D/ITEMWITHCAT: Item id =1 Category reference is a Is Excluded is false Referenced Category is a Referenced Category name is firstname
2018-12-20 21:39:56.972 9136-9160/so53839431.so53839431roomrelationship D/ITEMWITHCAT: Item id =2 Category reference is c Is Excluded is false Referenced Category is c Referenced Category name is thirdname
2018-12-20 21:39:56.972 9136-9160/so53839431.so53839431roomrelationship D/ITEMWITHCAT: Item id =4 Category reference is b Is Excluded is false Referenced Category is b Referenced Category name is secondname
2018-12-20 21:39:56.972 9136-9160/so53839431.so53839431roomrelationship D/ITEMWITHCAT: Item id =8 Category reference is d Is Excluded is false Referenced Category is d Referenced Category name is fourthname
