把数据从MySQL到vb.net中的表中的标签
问题描述:
我想从MySQL数据库中的表中标签中放置每个月的总和,但我不知道它在标签中cz我有lbl1,lbl2, ... lbl12。
我的代码:把数据从MySQL到vb.net中的表中的标签
connection.Open()
query = " SELECT SUM(Amount_income_table), MONTHNAME(Date_income_table)
FROM bacci.income_table
where year(Date_income_table)='" & LblYear.Text & "'
GROUP BY MONTHNAME(Date_income_table);"
Comand = New MySqlCommand(query, connection)
READER = Comand.ExecuteReader
While READER.Read
ChartIncomeYear.Series("Incomes").Points.AddXY(READER.GetString("MONTHNAME(Date_income_table)"), READER.GetString("SUM(Amount_income_table)"))
End While
connection.Close()
Catch ex As Exception
MessageBox.Show(ex.Message)
Finally
connection.Dispose()
End Try
该代码将填补图表,但我也想用相同的查询,以填补标签。
答
您不应该将您的标签设置为lbl1,lbl2和lbl3等。您应该在运行时创建它们。试试这个代码我是一个空白的项目。从这个例子中调整你的代码。我喜欢使用对象的名单,但你可以使用数组太
Dim LabelList As List(Of Label)
Sub LoadSumLabel()
LabelList = New List(Of Label)
For x = 1 To 12
Dim NewLabel As New Label
With NewLabel
.Name = DateAndTime.MonthName(x)
.Text = "0"
.AutoSize = True
.Left = 10
.Top = 10 + (LabelList.Count * NewLabel.Height)
End With
LabelList.Add(NewLabel)
Me.Controls.Add(LabelList.Item(LabelList.Count - 1))
AddHandler LabelList.Item(LabelList.Count - 1).Click, AddressOf Label_Click
'you can create a panel and add you control to it the same way. So if you resize the form you can have the scroll bars if it doesnt fit
'somepanel.controls(LabelList.Item(LabelList.Count - 1))
Next
End Sub
Private Sub Label_Click(sender As Object, e As EventArgs)
Dim thisLabel As Label = DirectCast(sender, Label)
MsgBox(thisLabel.Name, vbOKOnly, "Result")
End Sub
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles Me.Load
LoadSumLabel()
End Sub
Sub RunQuery()
connection.Open()
query = " SELECT SUM(Amount_income_table), MONTHNAME(Date_income_table)
FROM bacci.income_table
where year(Date_income_table)='" & LblYear.Text & "'
GROUP BY MONTHNAME(Date_income_table);"
Comand = New MySqlCommand(query, connection)
READER = Comand.ExecuteReader
While READER.Read
ChartIncomeYear.Series("Incomes").Points.AddXY(READER.GetString("MONTHNAME(Date_income_table)"), READER.GetString("SUM(Amount_income_table)"))
LabelList.Find(Function(lb As Label) lb.Name = READER.GetString("MONTHNAME(Date_income_table)")).Text = READER.GetString("SUM(Amount_income_table)")
End While
connection.Close()
Catch ex As Exception
MessageBox.Show(ex.Message)
Finally
connection.Dispose()
End Try
End Sub
答
名称您的标签这样lblJanuary,lblFebruary,lblMarch .... lblDecember。然后你可以使用此代码轻松解决你的问题:
query = " SELECT SUM(Amount_income_table) as Total, MONTHNAME(Date_income_table)
FROM bacci.income_table
where year(Date_income_table)='" & LblYear.Text & "'
GROUP BY MONTHNAME(Date_income_table);"
Comand = New MySqlCommand(query, connection)
READER = Comand.ExecuteReader
While READER.Read
ChartIncomeYear.Series("Incomes").Points.AddXY(READER.GetString("MONTHNAME(Date_income_table)"), READER.GetString("SUM(Amount_income_table)"))
Me.Controls("lbl" & READER.GetString("MONTHNAME(Date_income_table)")).Text = READER.GetString("Total")
End While
connection.Close()
Catch ex As Exception
MessageBox.Show(ex.Message)
Finally
connection.Dispose()
End Try
+0
谢谢我设法得到相同的结果,通过使用if .. then..else陈述,但其长。这个更好。 @Md。苏曼卡比尔 – sako
对不起,我改变了一些东西左右 – 2017-10-30 04:54:18
谢谢@mutedDisk这正是我想要的。 – sako
@sako没有问题芽 – 2017-10-30 13:53:47