代码
select where data_mon = '${date}' and ccy_unit = '${unit}' and start_dt >= '${startdate}' and start_dt <= '${enddate}' and rpt_freq = '${rpt_freq}' and 1=1 ${if(len(product_cd)==0,""," and prod_id ub("+"'"+treelayer(product_cd,true,"\',\'")+"'"+")")}