【转】动态SQL- case

create or replace procedure proc_query_rent

(

param_region varchar2,--定义区

param_room number,--定义室

param_hall number,--定义厅

param_rentMin number,--定义租金上限

param_rentMax number,--定义租金下限

param_resultSet OUT SYS_REFCURSOR --定义out参数返回结果集

)

as

--v_text_sql varchar2(500);

begin

open param_resultSet for

select * from tb_rent

where

region like

case

when param_region IS null then '%'

else param_region

end

AND

room like

case

when param_room IS null then '%'

else to_char(param_room)

end

AND

hall like

case

when param_hall IS null then '%'

else to_char(param_hall)

end

AND

rent between

case

when param_rentMin IS null then 0

else param_rentMin

end

AND

case

when param_rentMax IS null then 99999999

else param_rentMax

end;

end;

declare

v_rent_rows SYS_REFCURSOR;

v_rent_row tb_rent%rowType;

begin

proc_query_rent('山区',null,null,1200,null,v_rent_rows);

Dbms_output.put_line('所在区 室 厅 租金');

loop

fetch v_rent_rows into v_rent_row;

exit when v_rent_rows%NOTFOUND;

Dbms_output.put_line(v_rent_row.region||' '||v_rent_row.room||' '||v_rent_row.hall||' '||v_rent_row.rent);

end loop;

close v_rent_rows;

end;