postgresql sql批量更新记录

create function updatetchrnm() returns void as
$body$
declare
rownum integer := 1;
begin
while rownum <= 1000 loop
    update t_tchr set tchr_nm = '田中愛子' || rownum, tchr_knm = 'タナカアイコ' || rownum, tchr_anm = 'tanaka' || rownum where tchr_cd = 'tchr' || (1000000 + rownum);
    rownum := rownum + 1;
end loop;
return;
end;

$body$ language 'plpgsql';
select updatetchrnm();