I have in my table MS Access named ( Table1 ) two fields ( ID1 - Team1 ).
With NumericUpDown1 i select the number of rows that i want to display after randomize in DataGridView2.With NumericUpDown2 i select the number of columns that i want to display after randomize in DataGridView2.If i choose with NumericUpDown2 only one column ( the number 1 ) it work very well with this query :
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Con_randomize()
Dim rows As Integer
If Not Integer.TryParse(NumericUpDown1.Value, rows) Then
MsgBox("NUMBER NOT AVAILABLE", MsgBoxStyle.Critical + MsgBoxStyle.OkOnly, "Error")
NumericUpDown1.Value = ""
NumericUpDown1.Focus()
Exit Sub
End If
If NumericUpDown2.Value = 1 Then
Dim sql As String = String.Format("SELECT Top {0} ID1,Team1 From Table1 ORDER BY RND(-(100000*ID1)*Time())", rows)
InfoCommand = New OleDbCommand(sql, Con_randomize)
InfoAdapter = New OleDbDataAdapter()
InfoAdapter.SelectCommand = InfoCommand
InfoTable = New DataTable()
InfoAdapter.Fill(InfoTable)
DataGridView2.DataSource = InfoTable
DataGridView2.Columns(0).HeaderText = "NUMERO"
DataGridView2.Columns(1).HeaderText = "CATEGORY1"
End If
End Sub
How to make if i choose with NumericUpDown2 the number 2 or 3 columns i want to display in Datagridview2.
The columns will be named ( CATEGORY2 - CATEGORY3 ) . for example ( 1 Victor - David - Vincent ) ( 2 wiliam- George - Joseph ) ..in my only field named Team1 I have a hundred of the names
I'm not 100% sure why you need a query to initialize the data, but give this a go. It will automatically create the columns the way you need them.
' If NumericUpDown2.Value = 1 Then ' Comment This If Block Out
' Create the Teams String
Dim teamsString as New System.Text.StringBuilder("")
For i as Integer = 1 to Convert.ToInt32(NumericUpDown2.Value)
teamsString.Append(", (SELECT Top 1 Team1 From Table1 ORDER BY RND(-(100000*ID1)*Time())) as Category" + i.ToString())
Next
Dim sql As String = String.Format("SELECT Top {0} ID1" + teamsString.ToString() + " From Table1 ORDER BY RND(-(100000*ID1)*Time())", rows)
InfoCommand = New OleDbCommand(sql, Con_randomize)
InfoAdapter = New OleDbDataAdapter()
InfoAdapter.SelectCommand = InfoCommand
InfoTable = New DataTable()
InfoAdapter.Fill(InfoTable)
DataGridView2.DataSource = InfoTable
DataGridView2.Columns(0).HeaderText = "NUMERO"
' Don't Need This, We Made It the Binding Name
' DataGridView2.Columns(1).HeaderText = "CATEGORY1"
Related
I Have a datatable with following records
ID NAME VALUE CONTENT
1 AAA 10 SYS, LKE
2 BBB 20 NOM
1 AAA 15 BST
3 CCC 30 DSR
2 BBB 05 EFG
I want to write a VB.NET/LINQ query to have a output like below table: -
ID NAME SUM CONTENT (as CSV)
1 AAA 25 SYS, LKE, BST
2 BBB 25 NOM, EFG
3 CCC 30 DSR
Please provide me LINQ query to get the desired result. Thanks.
I have tried concatenation using below query
Dim grouped = From row In dtTgt.AsEnumerable() _
Group row By New With {row.Field(Of Int16)("ID"), row.Field(Of String)("Name")} _
Into grp() _
Select ID, Name, CONTENT= String.Join(",", From i In grp Select i.Field(Of String)("CONTENT"))
This query will give you the expected output:-
Dim result = From row In dt.AsEnumerable()
Group row By _group = New With {Key .Id = row.Field(Of Integer)("Id"),
Key .Name = row.Field(Of String)("Name")} Into g = Group
Select New With {Key .Id = _group.Id, Key .Name = _group.Name,
Key .Sum = g.Sum(Function(x) x.Field(Of Integer)("Value")),
Key .Content = String.Join(",", g.Select(Function(x) x.Field(Of String)("Content")))}
Thanks for your answers.
However, I have managed to get the desired result using simple code (Without LINQ): -
Dim dt2 As New DataTable
dt2 = dt.Clone()
For Each dRow As DataRow In dt.Rows
Dim iID As Integer = dRow("ID")
Dim sName As String = dRow("Name")
Dim sContt As String = dRow("Content")
Dim iValue As Integer = dRow("Value")
Dim rwTgt() As DataRow = dt2.Select("ID=" & iID)
If rwTgt.Length > 0 Then
rwTgt(0)("Value") += iValue
rwTgt(0)("Content") += ", " & sContt
Else
rw = dt2.NewRow()
rw("ID") = iID
rw("Name") = sName
rw("Value") = iValue
rw("Content") = sContt
dt2.Rows.Add(rw)
End If
Next
I try to use select case statement with SQL statement
I have 4 columns when the lbl1.text equal 1 then x = "column1" and put this value in the SQL statement
when I try this code
Dim x As String
Select Case lbl1.Text
Case 1
x = "column1"
Case 2
x = " column2"
Case 3
x = " column3"
Case 4
x = " column4"
DGV1.Columns.Clear()
Dim dt As New DataTable
dt.Clear()
DGV1.Visible = True
Dim comm2 As New SqlCommand
comm2.CommandText = Nothing
DGV1.Refresh()
comm2.CommandText = "select first_name,last_name,age from students where " + x + "=" + "yes" + ""
comm2.Connection = sqlconn
sqlconn.Open()
dr2 = comm2.ExecuteReader
dt.Load(dr2)
DGV1.AutoGenerateColumns = True
DGV1.DataSource = dt
DGV1.Refresh()
sqlconn.Close()
DGV1.Visible = True
comm2.Dispose()
End Select
and when lbl1.text = 1 or 2 or 3 it doesn't run the SQL statement but when the lbl1.text = 4 it's run SQL statement
can any one help me in this code
try this code, i just don't know if the break is the right syntax, but i guarantee you that this is the right code
` Dim x As String
Select Case lbl1.Text
Case 1
x = "column1"
Case 2
x = " column2"
Case 3
x = " column3"
Case 4
x = " column4"
End Select
DGV1.Columns.Clear()
Dim dt As New DataTable
dt.Clear()
DGV1.Visible = True
Dim comm2 As New SqlCommand
comm2.CommandText = Nothing
DGV1.Refresh()
comm2.CommandText = "select first_name,last_name,age from students where " + x + "=" + "yes" + ""
comm2.Connection = sqlconn
sqlconn.Open()
dr2 = comm2.ExecuteReader
dt.Load(dr2)
DGV1.AutoGenerateColumns = True
DGV1.DataSource = dt
DGV1.Refresh()
sqlconn.Close()
DGV1.Visible = True
comm2.Dispose()`
i have database with different value
number_reg
10
9
15
18
I tried
sql = "SELECT * from table where number_reg=(SELECT max(number_reg)from table)"
cmd = New OdbcCommand(sql, conn)
dtreader = cmd.ExecuteReader
If dtreader.Read Then
textbox1.Text = dtreader.Item("number_reg")
Else
textbox1.Text = "0"
End If
but the output is 10 how to get output is 18 ??
I have the following problem:
Inside one sqltransaction in vb.net I INSERT data into several tables.
it is something like this:
...
sqltransaction = connection.begintransaction
INSERT into table1
...
for i=1 to x
...
INSERT into table2
...
SELECT FROM table3
...
INSERT into table3
...
next i
sqltransaction.commit
...
Private Sub salveazaCerereaDeOferta()
If checkCompletion() = 1 Then
Dim conn As New SqlConnection(My.Settings.GestiuneService2012_beSQLConnectionString)
conn.Open()
Dim sqlTrans As SqlTransaction = conn.BeginTransaction()
Try
Dim cmdInsertCerereOferta As SqlCommand = conn.CreateCommand
cmdInsertCerereOferta.Transaction = sqlTrans
cmdInsertCerereOferta.CommandText = "INSERT INTO ListaCereriOferte (IDFurnizor,NrCerereOferta,DataCerereOferta,IDModTransCerereOferta,ObservatiiCerereOferta)" + _
" VALUES (#IDFurnizor,#NrCerereOferta,#DataCerereOferta,#IDModTransCerereOferta,#ObservatiiCerereOferta);" + _
" SELECT SCOPE_IDENTITY();"
cmdInsertCerereOferta.Parameters.Add("#IDFurnizor", SqlDbType.Int).Value = CInt(Me.t_IDFurnizor.Text)
cmdInsertCerereOferta.Parameters.Add("#NrCerereOferta", SqlDbType.Int).Value = CInt(Me.t_NumarCerereOferta.Text)
cmdInsertCerereOferta.Parameters.Add("#DataCerereOferta", SqlDbType.Date).Value = CDate(Me.t_DataCerereOferta.Text)
cmdInsertCerereOferta.Parameters.Add("#IDModTransCerereOferta", SqlDbType.Int).Value = 1
cmdInsertCerereOferta.Parameters.Add("#ObservatiiCerereOferta", SqlDbType.NVarChar).Value = Me.t_ObservatiiCerereOferta.Text
Dim IDCerereOferta As Integer = cmdInsertCerereOferta.ExecuteScalar
Dim ListaPieseCerereOferta = Me.CerereOfertaDataSet.ListaPieseCerereOferta.AsEnumerable
Dim ListaNecesarePePiesa = Me.CerereOfertaDataSet.NecesarePeOferta.AsEnumerable
Dim PieseOferta = From q In ListaPieseCerereOferta _
Select q
Dim cantTotalaPiese = Aggregate q In ListaPieseCerereOferta _
Into Sum(q.Cantitate)
Dim salvat As Integer = 0
Dim curIDPiesaDeSchimb As Integer
For Each piesa In PieseOferta
curIDPiesaDeSchimb = piesa.IDPiesaDeSchimb
Dim NecesarePePiesa = From p In ListaNecesarePePiesa _
Select p _
Order By p.IDNecesar Descending
Dim curIDNecesar As Integer
For Each necesar In NecesarePePiesa
curIDNecesar = necesar.IDNecesar
Dim cmdInsertPiesaCerereOferta As SqlCommand = conn.CreateCommand
cmdInsertPiesaCerereOferta.Transaction = sqlTrans
cmdInsertPiesaCerereOferta.CommandText = "INSERT INTO CereriOferte (IDCerereOferta,IDPiesaDeSchimb,Cantitate,UM,Observatii)" + _
" VALUES (#IDCerereOferta,#IDPiesaDeSchimb,#Cantitate,#UM,#Observatii);" + _
" SELECT SCOPE_IDENTITY();"
cmdInsertPiesaCerereOferta.Parameters.Add("#IDCerereOferta", SqlDbType.Int)
cmdInsertPiesaCerereOferta.Parameters.Add("#IDPiesaDeSchimb", SqlDbType.Int)
cmdInsertPiesaCerereOferta.Parameters.Add("#Cantitate", SqlDbType.Float)
cmdInsertPiesaCerereOferta.Parameters.Add("#UM", SqlDbType.NVarChar)
cmdInsertPiesaCerereOferta.Parameters.Add("#Observatii", SqlDbType.NVarChar)
Dim cmdInsertNecesarCerereOferta As SqlCommand = conn.CreateCommand
cmdInsertNecesarCerereOferta.Transaction = sqlTrans
cmdInsertNecesarCerereOferta.CommandText = "INSERT INTO NecesareCereriOferte (IDPiesaNecesar,IDPiesaCerereOferta)" + _
" VALUES (#IDPiesaNecesar,#IDPiesaCerereOferta)"
cmdInsertNecesarCerereOferta.Parameters.Add("#IDPiesaNecesar", SqlDbType.Int)
cmdInsertNecesarCerereOferta.Parameters.Add("#IDPiesaCerereOferta", SqlDbType.Int)
Select Case curIDNecesar
Case 0
cmdInsertPiesaCerereOferta.Parameters("#IDCerereOferta").Value = IDCerereOferta
cmdInsertPiesaCerereOferta.Parameters("#IDPiesaDeSchimb").Value = curIDPiesaDeSchimb
cmdInsertPiesaCerereOferta.Parameters("#Cantitate").Value = 1
cmdInsertPiesaCerereOferta.Parameters("#UM").Value = piesa.UM
cmdInsertPiesaCerereOferta.Parameters("#Observatii").Value = ""
For i = 1 To necesar.Cantitate
cmdInsertPiesaCerereOferta.ExecuteNonQuery()
salvat += 1
Me.tsspb_SalvareCerereOferta.Value = CInt(100 * salvat / cantTotalaPiese)
Next
Case Is > 0
Me.PieseNecesarePeOfertaTableAdapter.Fill(Me.CerereOfertaDataSet.PieseNecesarePeOferta, curIDNecesar, curIDPiesaDeSchimb, CInt(necesar.Cantitate))
Dim ListaPieseNecesarePeOferta = Me.CerereOfertaDataSet.PieseNecesarePeOferta.AsEnumerable
Dim PieseNecesareOferta = From q In ListaPieseNecesarePeOferta _
Select q
For i = 1 To necesar.Cantitate
cmdInsertPiesaCerereOferta.Parameters("#IDCerereOferta").Value = IDCerereOferta
cmdInsertPiesaCerereOferta.Parameters("#IDPiesaDeSchimb").Value = curIDPiesaDeSchimb
cmdInsertPiesaCerereOferta.Parameters("#Cantitate").Value = 1
cmdInsertPiesaCerereOferta.Parameters("#UM").Value = piesa.UM
cmdInsertPiesaCerereOferta.Parameters("#Observatii").Value = ""
Dim insertedIDPiesaCerereOferta As Integer = cmdInsertPiesaCerereOferta.ExecuteScalar
cmdInsertNecesarCerereOferta.Parameters("#IDPiesaNecesar").Value = PieseNecesareOferta(i - 1).IDPiesaNecesar
cmdInsertNecesarCerereOferta.Parameters("#IDPiesaCerereOferta").Value = insertedIDPiesaCerereOferta
cmdInsertNecesarCerereOferta.ExecuteNonQuery()
salvat += 1
Me.tsspb_SalvareCerereOferta.Value = CInt(100 * salvat / cantTotalaPiese)
Next
End Select
Next
Next
sqlTrans.Commit()
MsgBox("Cererea de oferta a fost salvata.")
Catch ex As Exception
Try
sqlTrans.Rollback()
MsgBox("A aparut o eroare." + vbNewLine + ex.ToString + vbNewLine + "RollBack success. Cererea nu a fost salvata.")
Catch ex2 As SqlException
If Not sqlTrans.Connection Is Nothing Then
MsgBox("An exception of type " & ex2.GetType().ToString() & _
" was encountered while attempting to roll back the transaction.")
End If
End Try
Finally
If conn.State = ConnectionState.Open Then conn.Close()
End Try
Else
MsgBox("Nu ai completat integral cererea de oferta!")
End If
End Sub
query that locks:
SELECT TOP (100) PERCENT dbo.qry_NecesareNerezolvate.IDPiesaNecesar, COUNT(dbo.NecesareCereriOferte.IDPiesaCerereOferta) AS CereriOferte,
dbo.qry_NecesareNerezolvate.IDNecesar, dbo.qry_NecesareNerezolvate.IDPiesaDeSchimb, dbo.qry_NecesareNerezolvate.Cantitate
FROM dbo.qry_NecesareNerezolvate LEFT OUTER JOIN
dbo.NecesareCereriOferte ON dbo.qry_NecesareNerezolvate.IDPiesaNecesar = dbo.NecesareCereriOferte.IDPiesaNecesar
GROUP BY dbo.qry_NecesareNerezolvate.IDPiesaNecesar, dbo.qry_NecesareNerezolvate.IDNecesar, dbo.qry_NecesareNerezolvate.IDPiesaDeSchimb,
dbo.qry_NecesareNerezolvate.Cantitate
qry_NecesareNerezolvate:
SELECT TOP (100) PERCENT dbo.Necesare.IDPiesaNecesar, dbo.Necesare.IDNecesar, dbo.Necesare.IDPiesaDeSchimb, dbo.Necesare.Cantitate, dbo.Necesare.UM,
dbo.Necesare.Observatii
FROM dbo.Necesare LEFT OUTER JOIN
dbo.qry_NecesareComandateRezolvate ON dbo.Necesare.IDPiesaNecesar = dbo.qry_NecesareComandateRezolvate.IDPiesaNecesar
WHERE (dbo.qry_NecesareComandateRezolvate.IDPiesaNecesar IS NULL)
qry_NecesareComandateRezolvate:
SELECT dbo.Necesare.IDPiesaNecesar, dbo.NecesareComenzi.IDPiesaComanda, dbo.NecesareRezolvate.IDBonTransfer
FROM dbo.Necesare LEFT OUTER JOIN
dbo.NecesareComenzi ON dbo.Necesare.IDPiesaNecesar = dbo.NecesareComenzi.IDPiesaNecesar LEFT OUTER JOIN
dbo.NecesareRezolvate ON dbo.Necesare.IDPiesaNecesar = dbo.NecesareRezolvate.IDPiesaNecesar
WHERE (dbo.NecesareComenzi.IDPiesaComanda IS NOT NULL) OR
(dbo.NecesareRezolvate.IDBonTransfer IS NOT NULL)
for i=1: insert, select then insert is working
then i=2 and: INSERT into table2... is working but SELECT FROM table1 and table3... gets timeout...
I don't understand why!
PS: If I break the code before second run of SELECT FROM table3 then go to SSMS and run the select query it gets timeout too...
In your code sample below, you have the transaction open till the end of the For Loop.
It seems to me that when i =1 , the transaction gets opened and a insertion is made. Now when i=2 , the to be inserted row when i=1 is in uncomitted state and if your select is joining to the table1 the lock level would have escalated to table level and locked everything down. Move the commit to inside the for loop and check how it goes.
for i=1 to x
...
INSERT into table2
...
SELECT FROM table3
...
INSERT into table3
...
next i
sqltransaction.commit
Consider my data table
ID Name
1 AAA
2 BBB
3 CCC
1 AAA
4 DDD
Final Output is
2 BBB
3 CCC
4 DDD
How can i remove the rows in the data table using Vb.Net
Any help is appreciated.
Following works if you only want the distinct rows(skip those with same ID and Name):
Dim distinctRows = From r In tbl
Group By Distinct = New With {Key .ID = CInt(r("ID")), Key .Name = CStr(r("Name"))} Into Group
Where Group.Count = 1
Select Distinct
' Create a new DataTable containing only the unique rows '
Dim tblDistinct = (From r In tbl
Join distinctRow In tblDistinct
On distinctRow.ID Equals CInt(r("ID")) _
And distinctRow.Name Equals CStr(r("Name"))
Select r).CopyToDataTable
If you want to remove the dups from the original table:
Dim tblDups = From r In tbl
Group By Dups = New With {Key .ID = CInt(r("ID")), Key .Name = CStr(r("Name"))} Into Group
Where Group.Count > 1
Select Dups
Dim dupRowList = (From r In tbl
Join dupRow In tblDups
On dupRow.ID Equals CInt(r("ID")) _
And dupRow.Name Equals CStr(r("Name"))
Select r).ToList()
For Each dup In dupRowList
tbl.Rows.Remove(dup)
Next
Here is your sample-data:
Dim tbl As New DataTable
tbl.Columns.Add(New DataColumn("ID", GetType(Int32)))
tbl.Columns.Add(New DataColumn("Name", GetType(String)))
Dim row = tbl.NewRow
row("ID") = 1
row("Name") = "AAA"
tbl.Rows.Add(row)
row = tbl.NewRow
row("ID") = 2
row("Name") = "BBB"
tbl.Rows.Add(row)
row = tbl.NewRow
row("ID") = 3
row("Name") = "CCC"
tbl.Rows.Add(row)
row = tbl.NewRow
row("ID") = 1
row("Name") = "AAA"
tbl.Rows.Add(row)
row = tbl.NewRow
row("ID") = 4
row("Name") = "DDD"
tbl.Rows.Add(row)
You can use the DefaultView.ToTable method of a DataTable to do the filtering like this:
Public Sub RemoveDuplicateRows(ByRef rDataTable As DataTable)
Dim pNewDataTable As DataTable
Dim pCurrentRowCopy As DataRow
Dim pColumnList As New List(Of String)
Dim pColumn As DataColumn
'Build column list
For Each pColumn In rDataTable.Columns
pColumnList.Add(pColumn.ColumnName)
Next
'Filter by all columns
pNewDataTable = rDataTable.DefaultView.ToTable(True, pColumnList.ToArray)
rDataTable = rDataTable.Clone
'Import rows into original table structure
For Each pCurrentRowCopy In pNewDataTable.Rows
rDataTable.ImportRow(pCurrentRowCopy)
Next
End Sub
Assuming you want to check all the columns, this should remove the duplicates from the DataTable (DT):
DT = DT.DefaultView.ToTable(True, Array.ConvertAll((From v In DT.Columns Select v.ColumnName).ToArray(), Function(x) x.ToString()))
Unless I overlooked it, this doesn't seem to be in the documentation (DataView.ToTable Method), but this also appears to do the same thing:
DT = DT.DefaultView.ToTable(True)