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UserDao.kt

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.observability.persistence

import android.arch.persistence.room.Dao
import android.arch.persistence.room.Insert
import android.arch.persistence.room.OnConflictStrategy
import android.arch.persistence.room.Query

import io.reactivex.Flowable

/**
 * Data Access Object for the users table.
 */
@Dao
interface UserDao {

/**
     * Get a user by id.

* @return the user from the table with a specific id.
     */
    @Query("SELECT * FROM Users WHERE userid = :id")
    fun getUserById(id: String): Flowable<User>

/**
     * Insert a user in the database. If the user already exists, replace it.

* @param user the user to be inserted.
     */
    @Insert(onConflict = OnConflictStrategy.REPLACE)
    fun insertUser(user: User)

/**
     * Delete all users.
     */
    @Query("DELETE FROM Users")
    fun deleteAllUsers()
}