如果需要未选择客户查询全部客户的话
ds1:
select * from 销售明细 t where 1 = 1 ${if(len(客户名称) =0,"","and t.id ='" + 控件名+ "'")}
ds2:
select * from 退货明细 t where 1 = 1 ${if(len(客户名称) =0,"","and t.id ='" + 控件名+ "'")}
如果参数控件不能为空的话
ds1:
select * from 销售明细 t where t.客户名称= '${控件名}'
ds2:
select * from 退货明细 t where t.客户名称= '${控件名}'