字符串分割（转载）
create or replace procedure pro_splitstr(iStart in NUMBER,
    sPattern in VARCHAR2, sBuffer in VARCHAR2,
    sResult out VARCHAR2, iNextPos out NUMBER) is
nPos1 number;
nPos2 number;
begin
    nPos1 := Instr(sBuffer, sPattern, iStart);
    if nPos1 = 0 then
        sResult := NULL;
    else
        nPos2 := Instr (sBuffer, sPattern, nPos1 + 1);
        if nPos2 = 0 then
            sResult := Rtrim(Ltrim(Substr(sBuffer, nPos1 + 1)));
            iNextPos := nPos2;
        else
            sResult := Substr(sBuffer, nPos1 + 1, nPos2 - nPos1 - 1);
            iNextPos := nPos2;
        end if;
    end if;
end pro_splitstr;
---字符串分割