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Android Room Relation with Condition
2019 Community Moderator ElectionIs there a way to run Python on Android?How do save an Android Activity state using save instance state?Close/hide the Android Soft KeyboardWhy is the Android emulator so slow? How can we speed up the Android emulator?“Debug certificate expired” error in Eclipse Android pluginsIs there a unique Android device ID?What is 'Context' on Android?Proper use cases for Android UserManager.isUserAGoat()?How to filter a nested relation in Room?Joining an Embedded Entity's row to POJO in Room Dao
In Room, I know we can make entities with @Embedded and @Relation to create a one to many model. However, it seems to select all items where the parent and child columns match.
If I have two tables, one with column id_1, and one with column id_2 and type, how would I model a query that filters on both matching id and type?
The query would be something like:
SELECT * FROM table1 LEFT JOIN table2 ON id_1 = id_2 WHERE id_1 = :id AND type = :type",
but if the return model uses @Relation, the compiler warns that all the table2 columns are unused, since they are fetched using the relation.
android android-room asked Mar 6 at 23:30
Allan WAllan W
8201819
add a comment |
In Room, I know we can make entities with @Embedded and @Relation to create a one to many model. However, it seems to select all items where the parent and child columns match.
If I have two tables, one with column id_1, and one with column id_2 and type, how would I model a query that filters on both matching id and type?
The query would be something like:
SELECT * FROM table1 LEFT JOIN table2 ON id_1 = id_2 WHERE id_1 = :id AND type = :type",
but if the return model uses @Relation, the compiler warns that all the table2 columns are unused, since they are fetched using the relation.
android android-room asked Mar 6 at 23:30
Allan WAllan W
8201819
add a comment |
In Room, I know we can make entities with @Embedded and @Relation to create a one to many model. However, it seems to select all items where the parent and child columns match.
If I have two tables, one with column id_1, and one with column id_2 and type, how would I model a query that filters on both matching id and type?
The query would be something like:
SELECT * FROM table1 LEFT JOIN table2 ON id_1 = id_2 WHERE id_1 = :id AND type = :type",
but if the return model uses @Relation, the compiler warns that all the table2 columns are unused, since they are fetched using the relation.
android android-room asked Mar 6 at 23:30
Allan WAllan W
8201819
In Room, I know we can make entities with @Embedded and @Relation to create a one to many model. However, it seems to select all items where the parent and child columns match.
If I have two tables, one with column id_1, and one with column id_2 and type, how would I model a query that filters on both matching id and type?
The query would be something like:
SELECT * FROM table1 LEFT JOIN table2 ON id_1 = id_2 WHERE id_1 = :id AND type = :type",
but if the return model uses @Relation, the compiler warns that all the table2 columns are unused, since they are fetched using the relation.
android android-room android android-room asked Mar 6 at 23:30
Allan WAllan W
8201819
asked Mar 6 at 23:30
Allan WAllan W
8201819
edited Mar 6 at 23:53
Allan W
asked Mar 6 at 23:30
Allan WAllan W
8201819
asked Mar 6 at 23:30
Allan WAllan W
8201819
asked Mar 6 at 23:30
Allan WAllan W
8201819
8201819
add a comment |
add a comment |
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