Insert or replace does not work

The command

INSERT OR REPLACE INTO SYSVAL ( CDDEVICE, DTVALINI, DTVALFIM, 
SALDO, REALTIME, VALIDADO ) VALUES( '34322910071833580','31-08-2016',
'31-08-2016','10','63714560','S')

works seamlessly in SQLiteStudio, but does not work when run by the application on Android.

Although it does not cause any errors, the table remains empty.

I changed the insertion code to something like this:

        Boolean result = false;
        ContentValues values = new ContentValues();
        values.put("CDDEVICE", valores[0].toString());
        values.put("DTVALINI", valores[1].toString());
        values.put("DTVALFIM", valores[2].toString());
        values.put("SALDO", valores[3].toString());
        values.put("REALTIME", valores[4].toString());
        values.put("VALIDADO", valores[5].toString());


        try{
            db.insertOrThrow("SYSVAL", null, values);
            result = true;
        }
        catch(Exception e)
        {
            Log.e("DB ERROR", e.toString());
            e.printStackTrace();
        }

And then it worked without problems.

Can anyone tell me why the first command is not working?

The structure of the SYSVAL table is as follows:

sqlString = "CREATE TABLE IF NOT EXISTS SYSVAL (" +
                    "    CDDEVICE   VARCHAR (25) NOT NULL," +
                    "    DTVALINI   DATE," +
                    "    DTVALFIM   DATE," +
                    "    SALDO      INT," +
                    "    REALTIME   NUMERIC(15)," +
                    "    VALIDADO   VARCHAR(1)," +
                    "    CONSTRAINT SYSVAL_PK PRIMARY KEY ( CDDEVICE )  "+
                    ");";

I'm running the command that does not work this way:

 public Boolean executacomando( SQLiteDatabase db, String comando  )
    {
        Boolean result = false;

        try {
            db.rawQuery( comando,  null );
            result = true;
        }
        catch (Exception e)
        {
            Log.e("DB Error", e.toString());
            e.printStackTrace();
        }

        return result;
    }

The method returns true normally, but the insert does not happen.