OledbException Data type mismatch in criteria expression - sql

Question

I'm getting a OledbException Data type mismatch in the criteria expression, at ad.Fill(xDataset, "TblMaster").
I'm using an Access database and Telerik Reporting.
This is my code
Public Sub TanggalX()
conn.Open()
Dim str9 As String = "Select * From TblMaster Where Tanggal='" & Me.DateTimePicker1.Value.Date.ToString("yyyy/MM/dd")) & "'"
ad = New OleDb.OleDbDataAdapter(str9, conn)
xDataset.Clear()
ad.Fill(xDataset, "TblMaster")
obj_RepDoc = New Report1
obj_RepDoc.DataSource = (xDataset)
Me.ReportViewer1.Report = obj_RepDoc
Me.ReportViewer1.RefreshReport()
Me.Show()
conn.Close()
End Sub
Please help me this is my last problem for this project.

Answer 1

You should use # instead of ' for Date/Time fields.
Dim str9 As String = "SELECT * FROM TblMaster WHERE Tanggal=#" & Me.DateTimePicker1.Value.Date.ToString("yyyy/MM/dd")) & "#"

Answer 2

My guess is that TblMaster.Tangall is of type Date and you are specifying it as a string in the WHERE clause of your SQL select command.
Try the following:
using (OleDbCommand comm = new OleDbCommand())
{
var parameter =comm.Parameters.AddWithValue("#tangall", Me.DateTimePicker1.Value);
parameter.OleDbType = OleDbType.DBDate;
using (var ad = new OleDbDataAdapter(comm))
{
... //do your stuff here
}
}

Answer 3

I think InBetween is right. You can also convert the string to date inside the SQL statement instead of using parameters by replacing your SQL statement with this:
Dim str9 As String = "Select * From TblMaster Where Tanggal=CDate('" & Me.DateTimePicker1.Value.ToString() & "')"