Hello:
I am trying to read excel data into data tables, and then join the tables. It is working, however I am having difficulty with assigning the data types. In the code below, I am trying to have the [Item] string be a string value, yet the system keeps defaulting it to double. The result is that the data is incorrect. This is my first issue.
Secondly, I want to join the two tables and have one nice data set. Somehow, I cannot have non-unique values. As of now, there is all kinds of data with multiple values for [Item] and [SONum]. [SONum] is the field I am trying to join on.
My question can be specific or general. If there is a good reference for this out there somewhere, I would love to know about it. We have so many excel systems that we need to read, and are not ready to move the data into sql as of yet. Obviously, that will be the eventual answer.
Thanks in advance for the help. Code below...
I am trying to read excel data into data tables, and then join the tables. It is working, however I am having difficulty with assigning the data types. In the code below, I am trying to have the [Item] string be a string value, yet the system keeps defaulting it to double. The result is that the data is incorrect. This is my first issue.
Secondly, I want to join the two tables and have one nice data set. Somehow, I cannot have non-unique values. As of now, there is all kinds of data with multiple values for [Item] and [SONum]. [SONum] is the field I am trying to join on.
My question can be specific or general. If there is a good reference for this out there somewhere, I would love to know about it. We have so many excel systems that we need to read, and are not ready to move the data into sql as of yet. Obviously, that will be the eventual answer.
Thanks in advance for the help. Code below...
HTML Code:
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim ds1 As String = "\\stylmark.com\fs-styl\Public\HISTORY\icedet 12mos122912.xlsx"
Dim ss1 As String = "SELECT [Item], [SONbr], [OrdDate], [Eng], [Cfg#Rev] FROM [MASTER$] " & _
"ORDER BY [Item] DESC "
Dim dt1 As New DataTable
dt1.Columns.Add("Item", GetType([String]))
dt1.Columns.Add("SONbr", GetType([Double]))
dt1.Columns.Add("OrdDate", GetType([DateTime]))
dt1.Columns.Add("Eng", GetType([String]))
dt1.Columns.Add("Cfg#Ref", GetType([String]))
dt1 = GetExcelMethod(ds1, ss1)
Dim ds2 As String = "\\stylmark.com\fs-styl\Public\PSE\MasterSchedule.xls"
Dim ss2 As String = "SELECT [SONbr], [Description], [Actual Eng# Hours] FROM [Schedule$] " & _
"WHERE [SONbr] IS NOT NULL " & _
"ORDER BY [SONbr] "
Dim dt2 As DataTable = GetExcelMethod(ds2, ss2)
Dim ds As New DataSet("DataSet")
ds.Tables.Add(dt1)
ds.Tables.Add(dt2)
GetColumnType(dt1)
GetColumnType(dt2)
'Dim drel As New DataRelation("EquiJoin", dt1.Columns("SONbr"), dt2.Columns("SONbr"))
'ds.Relations.Add(drel) ' Columns currently do not have unique values
'Dim jt As New DataTable("JoinedTable")
'jt.Columns.Add("Item", GetType([Double])) ' This needs to be a string value!
'jt.Columns.Add("SONbr", GetType([Double]))
'jt.Columns.Add("OrdDate", GetType([DateTime]))
'jt.Columns.Add("Eng", GetType([String]))
'jt.Columns.Add("Cfg#Ref", GetType([String]))
'jt.Columns.Add("Description", GetType([String]))
'jt.Columns.Add("Actual Eng# Hours", GetType([Double]))
'ds.Tables.Add(jt)
'For Each dr As DataRow In ds.Tables("Table1").Rows
' Dim parent As DataRow = dr.GetParentRow("EquiJoin")
' Dim current As DataRow = jt.NewRow()
' For i As Integer = 0 To ds.Tables("Table1").Columns.Count - 1
' current(i) = dr(i)
' Next
' current("Dname") = parent("Dname")
' jt.Rows.Add(current)
'Next
DataGridView1.DataSource = dt1
MessageBox.Show(DataGridView1.RowCount)
End Sub
Private Sub GetColumnType(dt As DataTable)
For c As Integer = 0 To dt.Columns.Count - 1
Debug.WriteLine(dt.Columns(c).ColumnName.ToString & ", " & dt.Columns(c).DataType.ToString)
Next
End Sub
Private Function GetExcelMethod(ByVal ds As String, ByVal ss As String) As DataTable
Dim dt As New DataTable()
Dim csbuilder As New OleDbConnectionStringBuilder()
csbuilder.Provider = "Microsoft.ACE.OLEDB.12.0"
csbuilder.DataSource = ds
csbuilder.Add("Extended Properties", "Excel 12.0 Xml;HDR=YES")
Using connection As New OleDbConnection(csbuilder.ConnectionString)
connection.Open()
Dim selectSql As String = ss
Debug.WriteLine(selectSql)
Using adapter As New OleDbDataAdapter(selectSql, connection)
adapter.Fill(dt)
End Using
connection.Close()
End Using
Return dt
End Function
End Class
