Question

我有sql的问题

我想选择那些费用的所有因素＆lt; 1 mounth前

我的代码：

Private Sub ShowData()
     Dim dtToday As DateTime = Date.Today
     dtToday = dtToday.AddMonths(-1)

     DataGridView1.RowTemplate.Height = 30
     DataGridView1.Font = New Font("Arial", 10, FontStyle.Regular)
     conn.Open()
     If conn.State = ConnectionState.Open Then
         conn.Close()
     End If

     With cmd
         .Connection = conn
         .CommandText = "select f_id,f_recno,f_name,f_workout,f_feesmode,f_fees,f_feesdate from
 tbl_memberfees where f_feesdate > " & Date.Today.AddMonths(-1) & ""
     End With
     da.SelectCommand = cmd
     dt.Clear()
     da.Fill(dt)
     DataGridView1.DataSource = dt
     conn.Close()
     datagridviewcontrol()
End Sub

Answer 1

试试这个...因为您将数据存储在SQL中作为varchar。您应该在SQL中进行转换。

Private Sub ShowData()
 Dim dtToday As DateTime = Date.Today
 dtToday = dtToday.AddMonths(-1)

 DataGridView1.RowTemplate.Height = 30
 DataGridView1.Font = New Font("Arial", 10, FontStyle.Regular)
 conn.Open()
 If conn.State = ConnectionState.Open Then
     conn.Close()
 End If

 With cmd
     .Connection = conn
.CommandText = 
"selectf_id,f_recno,f_name,f_workout,f_feesmode,f_fees,f_feesdate 
from tbl_memberfees 
where CONVERT(DATETIME, f_feesdate , XXX)> " & Date.Today.AddMonths(-1) & ""
End With
 da.SelectCommand = cmd
 dt.Clear()
 da.Fill(dt)
 DataGridView1.DataSource = dt
 conn.Close()
 datagridviewcontrol()
End Sub

其中XXX是以字符串形式存储的日期的当前格式。

如何选择所有memeber vb.net

1 个答案: