winform控件缩写（四）数据 序号 缩写 空间名 1 dts DataSet 2 dgv DataGridView 3 bds BindingSource 4 bdn BindingNavigator 5
![mysql5.7的sql优化[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)