(_connection.QueryFirstOrDefault<decimal?>(" select `val` from dc_ana_deviation where sku=@sku and project=@project and field=@field and date_str=@date_str and field_type=@field_type ",new
{
sku=skuData.sku,
project=skuData.project,
field="销售产品成本",
date_str=nowDateStr,
field_type="推测值"
},commandTimeout:0)??0)
(_connection.QueryFirstOrDefault<decimal?>(" select `val` from dc_ana_deviation where sku=@sku and project=@project and field=@field and date_str=@date_str and field_type=@field_type ",new