Android Room Insert or Update

December 27, 2018
Perform insert if new, else perform update

Solution 1

Try insert first. If failed, then perform an update.

@Dao
interface PinDao {

    @Insert(onConflict = OnConflictStrategy.IGNORE)
    fun insertIgnore(entity: Pin) : Long

    @Update
    fun update(entity: Pin)

    @Transaction
    fun insertOrUpdate(entity: Pin) {
        if (insertIgnore(entity) == -1L) {
            update(entity)
        }
    }
}

Solution 2

If a row with the same ID already exist, it will delete the existing row and insert a new row. If you are using auto generated ID, this solution probably won’t work.

@Insert(onConflict = OnConflictStrategy.REPLACE)
fun insertReplace(entity: T) : Long

Solution 3

If you are using auto generated id, you can check if ID is empty and perform insert, else perform update.

If ID is not realiable, you can create an is_new field to help determine if you should perform insert or update.

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