[英]How can I Count, Compare and Add Values in DataGridView`s Rows?
我需要什么才能能够对DataGridView进行计数,比较和添加值?
这是我用于插入/填充Datagridview的代码行
Sub display()
Dim temp As Double = 0
'count is my ID that counts the number of tickets from 1 and so on - count is also primary key in my database..
Dim lt As String = "select count as Tickets, mname as Movie, mtime as Time, mprice as Price, mimg as Photo from tickets order by count asc" 'add desc for descending order/ asc for ascending (order by vlanme desc)
Dim da As New MySqlDataAdapter(lt, con)
con.Open()
Dim ds As New DataSet
da.Fill(ds, "settings")
da.Dispose()
DataGridView1.DataSource = ds.Tables(0)
con.Close()
End Sub
我要计算的是我的Datagridview有多少行
我也想比较两行之间的值
我也想添加两行的值
我只想计算我有多少张票,比较Row(1)和Row(2)的名称,依此类推,然后将Row(1)的价格加起来,依此类推
(我想在不使用.SelectedCell方法的情况下执行此操作,因为我将一次计数,比较,添加它们-datagridview中的所有现有数据)
谢谢!
我已经找到答案了
Dim bs As New BindingSource
Dim dr As MySqlDataReader
Dim rowcount As Integer = DataGridView1.Rows.Count
Dim moviecount As Integer = 0
Dim price As Integer = 0
For index As Integer = 0 To rowcount
Try
If con.State = ConnectionState.Closed Then
con.Open()
Dim query As String = "select * from tickets where count = '" & index & "'"
Dim cmd As New MySqlCommand(query, con)
dr = cmd.ExecuteReader
While dr.Read
If moviecount = 0 Then
movie = dr.GetString("mname")
moviecount += 1
End If
If moviecount > 0 Then
If movie = dr.GetString("mname") Then
price += dr.GetInt32("mprice")
Else
MsgBox(movie & " has a total sales of : " & price, MsgBoxStyle.Information, "System Checked!")
price = 0
price += dr.GetInt32("mprice")
moviecount = 0
End If
End If
End While
End If
Catch ex As Exception
MsgBox(ex.Message)
End Try
con.Close()
Next
MsgBox(movie & " has a total sales of : " & price, MsgBoxStyle.Information, "System Checked!")
dr.getString(“数据库中的变量”)或dr.getInt32(“数据库中的变量”)
这样,您就可以选择将数据库中的哪个值转移到您设置为String或Int的任何Varname中(如果添加循环,还需要哪一行)
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