//创立函数：
create function add_program_time(int4,timestamp,int4,int4,int4) returns bool as '
declare
prog_id alias for $1;
duration_min alias for $3;
period_min alias for $4;
repeat_times alias for $5;
i int;
starttime timestamp;
ins_starttime timestamp;
ins_endtime timestamp;
begin
starttime :=$2;
i := 0;
while i<repeat_times loop
ins_starttime := starttime;
ins_endtime := timestamp_pl_span(ins_starttime,duration_min || ''mins'');
starttime := timestamp_pl_span(ins_starttime,period_min || ''mins'');
insert into co_schedule values(prog_id,ins_starttime,ins_endtime);
i := i+1;
end loop;
if i<repeat_times then
return false;
else
return true;
end if;
end;
'language 'plpgsql';