Cannot update Boolean Array in Room database

Question

I'm trying to update a Boolean array in android room database but it throws this error

E/SQLiteLog: (1) near "?": syntax error in "UPDATE alarm_table SET mDaysOfWeekArr=?,?,?,?,?,?,?,? WHERE mAlarmId=?"

Query:(AlarmDao.java)

    @TypeConverters({Converter.class})
    @Query("UPDATE alarm_table SET mDaysOfWeekArr=:daysOfWeekArr WHERE mAlarmId=:alarmId")
    void updateRecAlarmStatus(Boolean[] daysOfWeekArr, int alarmId);

When Inserting / Reading the Boolean array correct values are saved in db (Using Query)

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    void insert(AlarmEntity alarmEntity);

Room Db Repository(AlarmRepository.java)

    public void updateRecAlarmStatus(final Boolean[] daysOfWeekArr, final int alarmId) {
        databaseWriteExecutor.execute(new Runnable() {
            @Override
            public void run() {
                alarmDao.updateRecAlarmStatus(daysOfWeekArr, alarmId);
            }
        });
    }

Calling above function with onClick from recyclerView and reading data from entity using getters and changing values in Boolean[]

daysOfWeek[1] = true;
daysOfWeek[5] = true
ar.updateRecAlarmStatus(daysOfWeekArr, alarmId);

Entity Class: (AlarmEntity.java)

@Entity(tableName = "alarm_table")
public class AlarmEntity {

    // ID used to disable / enable / delete alarms
    @PrimaryKey
    private int mAlarmId;

    // Trigger time for alarm
    private long mAlarmTime;
    private boolean mAlarmEnabled;

    @TypeConverters({Converter.class})
    private Boolean[] mDaysOfWeekArr;

......
...... }

TypeConverter

public class Converter {

    // Used by AlarmEntity Boolean[] mDaysOfWeek

    @TypeConverter
    public static Boolean[] fromString(String value) {
        Type listType = new TypeToken<Boolean[]>() {
        }.getType();
        Log.e("Converter: ", "fromString Called");
        return new Gson().fromJson(value, listType);
    }

    @TypeConverter
    public static String fromBoolean(Boolean[] list) {
        Gson gson = new Gson();
        Log.e("Converter: ", "fromString Called");
        return gson.toJson(list);
    }

}

This is my first time asking on stackoverflow.. Please ask if more info/code is required

EDIT:

After fetching one alarmEntity object from db and modifying its values I'm able to save the changes using inbuilt @Update query

but this query does not work... I'm sure below SET mDaysOfWeekArr=:daysOfWeekArr is wrong but I don't know how to fix it

    @TypeConverters({Converter.class})
    @Query("UPDATE alarm_table SET mDaysOfWeekArr=:daysOfWeekArr WHERE mAlarmId=:alarmId")
    void updateRecAlarmStatus(Boolean[] daysOfWeekArr, int alarmId);

Answer 1

The mDaysOfWeekArr is stored as TEXT in SQLite, so you can't do an UPDATE alarm_table SET mDaysOfWeekArr=:daysOfWeekArr WHERE mAlarmId=:alarmId with a Boolean[], hence you get that error.

I'd change your Dao method to be void updateRecAlarmStatus(String daysOfWeekArr, int alarmId), and do your JSON conversion before the calling of this method.

EDIT: Also it doesn't seem that Room is able to use TypeConverters when the Dao method has a @Query annotation.