参数多，选择其中某个，或者多个，查询出对应的数据，不选的默认全部，
那个if判断的格式怎么写
https://help.fanruan.com/finereport10.0/doc-view-2394.html?source=4#
不选默认全部
select * from 表 where 1=1
${if(len(控件1)=0,""," and 字段1='"+控件1+"'")}
${if(len(控件2)=0,""," and 字段2='"+控件2+"'")}
${if(len(控件3)=0,""," and 字段3='"+控件3+"'")}
1min目标场景问卷
立即参与
