[SQL] Help me do a LOOP

[Calin Meze]

 I need to test each record of a cursor for some requirements, something like this

DECLARE xpvnr varchar(50);
     xdata date;
     xcod int;
     xagentd varchar(3);
     xid bigint;
     xserie varchar(4);
     xnr varchar(7);
     xsocasig varchar(3);
DECLARE myCursor CURSOR FOR
     select cod,pvnr,data,agentd,id,serie,nr,socasig
     from pvmst, pvdtl
     where pvmst.cod=pvdtl.cod
     order by data;
BEGIN
delete from stoccalc_temp;
OPEN myCursor;
FETCH NEXT FROM myCursor INTO xcod,xpvnr,xdata,xagentd,xid,xserie,xnr,

xsocasig;  
WH ILE (still in the cursor)
     BEGIN
     DECLARE
          xxcod varchar(21);
          xxcod2 varchar(21);
          xxagent varchar(3);
          xxid bigint;
     DECLARE my2cursor CURSOR FOR
          select cod,agent,id from stoccalc_temp
          where nr=xnr and serie=xserie and socasig=xsocasig;
          OPEN my2cursor;
          FETCH NEXT FROM my2cursor INTO xxcod,xxagent,xxid;
          xxcod2:=TRIM('2005'+TRIM(xsocasig)+TRIM(xxagent)+TRIM(xserie)+TRIM(xnr));
          IF xxcod <> '' THEN -- inseamna ca este in stoccalc_temp polita
          update stoccalc set cod=xxcod2, agent=xxagent, stare='0' where id=xid;
          END IF;
          CLOSE my2cursor;
     FETCH NEXT FROM myCursor INTO xcod,xpvnr,xdata,xagentd,xid,xserie,xnr,xsocasig;
     END;
CLOSE myCursor;
END;

-- the problem is that I do not know how to make the while loop execute until the last record "WHILE (still in the cursor)"... So I need something like

for i:=1 to lastrecord_of_cursor do
begin
...
end;

Can anyone help me with this? It really seems silly... but I cannot get to solve this, I do not know where to look for syntax like this or tutorials  like this.
Help

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