PreferenceDao.kt
/*
* Copyright 2019 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 androidx.work.impl.model
import androidx.lifecycle.LiveData
import androidx.room.Dao
import androidx.room.Insert
import androidx.room.OnConflictStrategy
import androidx.room.Query
/**
* A Data Access Object for accessing [Preference]s.
*/
@Dao
interface PreferenceDao {
/**
* Inserts a [Preference] into the database.
*
* @param preference The [Preference] entity to be inserted into the database
*/
@Insert(onConflict = OnConflictStrategy.REPLACE)
fun insertPreference(preference: Preference)
/**
* Fetches the value for the given [String] key.
*
* @param key The [String] key
* @return The value if present for the given [String] key
*/
@Query("SELECT long_value FROM Preference where `key`=:key")
fun getLongValue(key: String): Long?
/**
* Fetches a [LiveData] of [Long] for the given [String] key.
*
* @param key The [String] key
* @return The [LiveData] of [Long] if present for the given
* [String] key
*/
@Query("SELECT long_value FROM Preference where `key`=:key")
fun getObservableLongValue(key: String): LiveData<Long?>
}