求 VB代码 加注释

Private Sub an_Click()If an.Caption = "搜索" Thena = ""If Trim(xm.Text) <>"" Thena = "where 姓名 = " + Trim(xm.Text)End IfIf Trim(xh.Text) <>"" ThenIf a <>"" Thena = a + " and"Elsea = a + "where"End Ifa = a + " 学号 = " + Trim(xh.Text)End IfAdodc1.RecordSource = "select * from student " + aAdodc1.Refreshan.Caption = "删除"Else If MsgBox("是否要删除此信息?", vbYesNo, "提示") = vbYes Then If MsgBox("真的要删除此信息?", vbYesNo, "提示") = vbYes Then If MsgBox("确定要删除此信息?", vbYesNo, "提示") = vbYes Then Adodc1.Recordset.Delete Else an.Caption = "搜索" End If Else an.Caption = "搜索" End If Else an.Caption = "搜索" End Ifan.Caption = "搜索"xm.Text = ""xh.Text = ""End IfEnd Sub //点击an按钮，如果这个按钮的标题是“搜索”,那么根据xm和xh的text值，来查询学生信息，如果按钮的标题是“删除”,就把这个记录删除。 收起