hi I have a somewhat bizarre problem
When I go to add the table from sql on datagridview like:
Dim Connection As New SqlConnection("SERVER=*******;DATABASE=********;USER=sa;PWD=********")
Dim cmd As SqlCommand = New SqlCommand(query1, Connection)
Dim da As New SqlDataAdapter(cmd)
Dim commandbuilder = New SqlCommandBuilder(da)
Dim ds = New DataSet()
da.Fill(ds)
dtgMain.AutoGenerateColumns = True
dtgMain.DataSource = ds.Tables(0)
Nothing is displayed in the datagridview.
If I count the rows and columns imported:
MsgBox(dtgMain.Columns.Count)
MsgBox(dtgMain.Rows.Count)
It correctly returns both.
Even if I preview the ds.tables I can see the table correctly
Tips??
Related
Attempting to fill a data table using SqlDataAdapter with a WHERE clause but it returns nothing. The SQL command itself returns data from SSMS and removing just the WHERE clause in code fills data table as expected.
Dim adapter As New SqlDataAdapter
Dim datatable As New DataTable
Using cnn As New SqlConnection(connectionString)
cnn.Open()
adapter = New SqlDataAdapter("SELECT * FROM [MyProjectDtbl] WHERE zipcode = 22021", cnn)
adapter.Fill(datatable)
adapter.Dispose()
End Using
Digging through the Select command EventSink, I found:
Unable to cast object of type 'System.Data.SqlClient.SqlInternalConnectionTds' to type 'System.Data.SqlClient.SqlInternalConnectionSmi'
Try it with parameters.
Private Sub OPCode()
Dim dt As New DataTable
Using cnn As New SqlConnection(connectionString),
cmd As New SqlCommand("SELECT * FROM [MyProjectDtbl] WHERE zipcode = #zip", cnn)
cmd.Parameters.Add("#zip", SqlDbType.Int).Value = 22021
cnn.Open()
dt.Load(cmd.ExecuteReader)
End Using
Debug.Print(dt.Rows.Count.ToString)
End Sub
Would there be a chance to solve this problem? Once that I inserted a data from the Database, I wanted to update my DataGridView from the other form. Clearly the datagridview has to update as it SELECT on the table of the Database. But once that I updated the datagridview, I tried closing the system from running and restart it again. But when I checked there it didn't update. It goes like the usual datas that is from the Database. However my database is well updated and the data I inserted from the TextBoxes was there too.
Private Sub updateBtn_Click(sender As Object, e As EventArgs) Handles updateBtn.Click
Dim newtable = New DataTable()
provider = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source="
datafile = "C:\Users\Anthony\Desktop\thesis\DATABASE\BookLists.accdb"
connString = provider & datafile
myConnection.ConnectionString = connString
myConnection.Open()
Dim str As String
Try
str = "Select * from TVL12"
Dim cmd As OleDbCommand = New OleDbCommand(str, myConnection)
Dim da As OleDbDataAdapter = New OleDbDataAdapter()
da.SelectCommand = cmd
da.Fill(newtable)
cmd.Dispose()
myConnection.Close()
Catch ex As Exception
MsgBox(ex.Message)
End Try
TVL12.BookListTVL.DataSource = newtable
End Sub
Here's the code for Updating the DataGridView. Anyone had any ideas why does it only Temporarily updates the DataGridView?
I use visual basic 2008 and a SQL Server database. I want to write the information stock in the database and I want to be rank like in php I use table to rank information what the method to do that in vb. This code write only last information into the table tbl_cars
Dim da As SqlDataAdapter
Dim dt As DataTable
Dim sqlconn As New SqlConnection("Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\m7md\Documents\Visual Studio 2008\Projects\Cars\Cars\cars.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True")
dt = New DataTable
da = New SqlDataAdapter
Dim sql As String = ("select * from tbl_cars ")
da = New SqlDataAdapter(sql, sqlconn)
sqlconn.Open()
da.Fill(dt)
For Each drRow As DataRow In dt.Rows
Label6.Text= (drRow.Item("db_type").ToString)
Label7.Text = (drRow.Item("db_gender").ToString)
Label8.Text = (drRow.Item("db_color").ToString)
Label9.Text = (drRow.Item("db_price").ToString)
Next
End Sub
I use Visual Basic 2010 and Microsoft SQL Server 2008. I have my database and my table and i made the connection (at least i think i did) in VB using only the interface.
What i want to know is how to get data from the database and use it into my VB project. I have of course searched for solutions already but the differences i find only confuse me more. What i need to know are the basics, the tools/objects and procedures to retrieve the data.
What i try to do at the moment is make a simple selection and put that data into a listbox right when the program starts, like this:
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
SqlConnection1.Open()
SqlConnection1.Close()
End Sub
End Class
1) Create your connection string
Dim connectionString As String = "Data Source=localhost;........."
2) Connect to your Database
Dim connection As New SqlConnection(connectionString)
conn.Open()
3) Create a Command and the query
Dim command As New SqlCommand("SELECT * FROM Product", connection)
Dim reader As SqlDataReader = command.ExecuteReader() //Execute the Query
4) Retrieve your result. There are several ways
Dim dt As New DataTable()
dt.Load(reader)
'Close the connection
connection.Close()
5) Bind to your list box
myListBox.ItemSource = dt
Full code here
Using connection As New SqlConnection(connectionString)
Dim command As New SqlCommand("Select * from Products", connection)
command.Connection.Open()
SqlDataReader reader = command.ExecuteReader()
End Using
For more info
SQLCommand
SqlConnection1.Open()
using table As DataTable = New DataTable
using command as SqlCommand = New SqlCommand("SELECT blah blah", SqlConnection1)
using adapter As SqlDataAdapter = new SqlDataAdapter(command)
adapter.Fill(table)
end using
end using
for each row As DataRow in table.Rows
' add each listbox item
listbox1.Items.Add(row("column name"))
next
end using
SqlConnection1.Close()
I'm new to vb.net and having quite a challenge with updating a field in a table using the For...Next construct on a data set. Sample code below - can anyone tell me what I'm missing? I know this particular example could be accomplished with a simple SQL update statement, but the actual use for what this code will become requires stepping through each record in the dataset. The example below is just a simple one to let me get the procedure down. Note that this runs without an exception, but just doesn't change the data in the table.
Help! :)
Dim objConn As SqlConnection = New SqlConnection("Data Source=DALLAS\;Initial Catalog=Adaptive;Integrated Security=True")
Dim selectCMD As SqlCommand = New SqlCommand("SELECT * from dwbprocref", objConn)
selectCMD.CommandTimeout = 30
Dim custDA As SqlDataAdapter = New SqlDataAdapter
custDA.SelectCommand = selectCMD
Dim custCB As SqlCommandBuilder = New SqlCommandBuilder(custDA)
custCB.QuotePrefix = "["
custCB.QuoteSuffix = "]"
Dim dRow As DataRow
Dim dTable As DataTable
objConn.Open()
Dim custDS As DataSet = New DataSet
custDA.Fill(custDS, "dwbprocref")
For Each dRow In custDS.Tables(0).Rows
If dRow.Item("pr_format") = "MDV" Then
dRow.Item("pr_tester") = "X"
End If
custDS.AcceptChanges()
Next
custDA.Update(custDS, "dwbprocref")
objConn.Close()
You're calling AcceptChanges. This marks all of the rows as being unmodified, so they are never updated in the database. Remove this call and you should be good.