Cursor stored procedure Mysql

I'm inside a cursor that has 10 rows of result. 2 rows perpendicular to a number. example: 1,2 = 1, 3,4 = 2, 5,6 = 6, 7,8 = 9 , 9,10 = 3.

How do I add the values that match the same number inside the cursor?

This is my FETCH of the cursor, I have 10 rows inside it, the spv_total_item is of a specified spv_moeda_id and I want to add when the spv_moeda_id are the same, how do I do this?

FETCH cursor_comissao INTO SPV_COMISSAO_ID, SPV_COMPRA_ID, SPV_PERCENTUAL, SPV_MOEDA_ID, SPV_DATA_CAMBIO, SPV_TOTAL_ITEM;

I would be very grateful if someone helped me with this logic.

I tried, but the first time I run the row, the spv_moeda_check is null, and only at the end of the loop will it have a value.

 OPEN cursor_comissao;


-- INICIANDO A VARIAVEL DURAÇÃO DO LOOP PARA 0;
SET SPV_DURACAO = 0;

loop_comissoes: LOOP

FETCH cursor_comissao INTO SPV_COMISSAO_ID, SPV_COMPRA_ID, SPV_PERCENTUAL, SPV_MOEDA_ID, SPV_DATA_CAMBIO, SPV_TOTAL_ITEM;    


  IF CURSOR_FIM = 1 THEN 
        LEAVE loop_comissoes;
    END IF; 

    IF SPV_DURACAO = SPV_LOOP THEN
       SET CURSOR_FIM = 1;
       LEAVE loop_comissoes;
    END IF;

    IF SPV_COMISSAO_ID = SPV_ID_CHECK THEN
        SPV_TOTAL_ITEM = SPV_TOTAL_ITEM + SPV_TOTAL_ITEM;
        ITERATE loop_comissoes;
    END IF;



    CALL SP_CONVERTE_REAIS_DATA(SPV_TOTAL_ITEM,SPV_MOEDA_ID,SPV_DATA_CAMBIO,SPV_TOTAL_ITEM);

-- SETANDO O CAMPO VALOR DA ROW ATUAL DO LOOP;
    UPDATE cliente_compra_comissao SET valor = SPV_TOTAL_ITEM WHERE id = SPV_COMISSAO_ID;       

    SET SPV_DURACAO = SPV_DURACAO + 1;
    SET SPV_TOTAL_ITEM = 0;
    SET SPV_ID_CHECK = SPV_COMISSAO_ID;
END LOOP loop_comissoes;
CLOSE cursor_comissao;
CLOSE cursor_comissao_id;