sql_code varchar2(4000);
ipos number(5);
begin
sql_code :='.................................';--长度大于255的字符串
iPos:=1;
WHILE ipos<=length(sql_code) LOOP
dbms_output.put_line(substr(sql_code,ipos,255));
iPos:=iPos+255;
END LOOP;
end;
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