@Query("select * from UserInfo where first_name like :first and " + "last_name like :last limit 1") UserInfo findByName(String first, String last); @Query("select id,first_name,last_name from UserInfo where id = :id") UserInfo getUserInfoViaId(int id); @Insert(onConflict = OnConf...
@DaointerfaceUserDao{@InsertfunaddUser(user:User):Long@UpdatefunupdateUser(user:User)@DeletefundeleteUser(user:User)@Query("delete from User where name = :name")fundeleteUserByName(name:String)@Query("select * from User")fungetUsers():List<User>@Query("select * from User where age > :ag...
var id:Long = 0L } data class Test(val testName:String) { } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. test中表的字段会在创建student表的时候创建出来,所以student会多出testName这一列。 rxjava2 还可以使用rxjava,进行异步操作,需要引入依赖 implementation "androidx.room:r...
1、创建一个人的实体 import androidx.room.Entityimport androidx.room.PrimaryKey@Entitydata class Owner(val name: String) {//关联键@PrimaryKeyvar ownerId: Long = 2} 2、创建一个狗狗类用于对应 @Entitydata class Dog(val name: String,val cuteness: Int,val barkVolume: Int,val breed: String) ...
interface MovieDao {@Insertfun insert(vararg movies: Movie?): LongArray?@Deletefun delete(movie: Movie?): Int@Updatefun update(vararg movies: Movie?): Int@get:Query("SELECT * FROM movie")val allMovies: LiveData<List<Movie?>?>} @Dao表示访问DB的方法,需要声明为接口或抽象类,编译阶段将生成 ...
要使用这个功能, 在build.gradle文件中添加依赖:android.arch.persistence.room:rxjava2. 之后, 你可以返回在RxJava2中定义的数据类型, 如下所示: 1 @Dao2 public interface MyDao {3 @Query("SELECT * from user where id = :id LIMIT 1")4 public Flowable<User> loadUserById(int id);5 } ...
fun findById(id:Long): Student :后面的参数即为方法中的参数,需要多少传多少即可 其实这样一个方法的上面只要写sql就好了,还是很简单的,在比如,相求 总的数据条数: @Query("select count(*) from student") fun findCount():Int 是不是很简单,当然如果你想联合查询某几个表,只是保留某几个字段的话,那...
{val query=SimpleSQLiteQuery("select * from $tableName")returndoFindAll(query)}funfind(id:Long):T?{val query=SimpleSQLiteQuery("select * from $tableName where id = ?",arrayOf<Any>(id))returndoFind(query)}/** * [params] 列名
I was back from a long day, sweaty n sticky, only to find myself with no water for shower, hence not able to sleep and waited for the water supply to be back. By the time water runs from the tap again, it was almost 3am. Reviewed October 15, 2019 Did you find this review ...
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