I am using Microsoft Access as my data source in Visual Studio and want to input a query into it to return a value.
Here is my code:
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
MyConn = New OleDbConnection
MyConn.ConnectionString = connString
ds = New DataSet
tables = ds.Tables
da = New OleDbDataAdapter("Select * from [Spend]", MyConn)
da.Fill(ds, "Spend")
Dim view As New DataView(tables(0))
source1.DataSource = view
DataGridView1.DataSource = view
MyConn.Open()
StartMonth = System.DateTime.Now.ToString("01/MM/yyyy HH:mm:ss")
query = "Select Amount from [Spend] WHERE Spend Date >='" & StartMonth & "'"
cmd = New OleDbCommand(query, MyConn)
TotalCost = CInt(cmd.ExecuteScalar())
MyConn.Close()
End Sub
End Class
I am receiving this error:
Syntax error (missing operator) in query expression 'Spend Date >='01/01/2016 13:46:50''
Can anyone help?
For Access, you should use:
StartMonth = System.DateTime.Now.ToString("yyyy'/'MM'/'01 HH:mm:ss")
query = "Select Amount from [Spend] WHERE [Spend Date] >= #" & StartMonth & "#"
I have found an answer to my problem.
If you have a column name separated by a space, such as 'Spend Date'
You MUST enclose it in brackets like this [Spend Date]
Hope this helps.
Try putting the date in # not '
Examples of using dates as criteria in Access queries
Related
I am stuck with little problem. I have a sql database with DATE column. It is populated from a Label like this: Label1.text = Date.today
and need to show records from one date in datagridwiev. So I need filter date using date from Label. So far I have this:
Public Sub ShowData()
cmd = New SqlCommand("Select * FROM Cisnik WHERE Datum = #" & Label3.Text & "# ", con)
If con.State = ConnectionState.Closed Then con.Open()
myDA = New SqlDataAdapter(cmd)
myDataSet = New DataSet()
myDA.Fill(myDataSet, "Cisnik")
DGV3.DataSource = myDataSet.Tables("Cisnik").DefaultView
End Sub
This code throws : Incorrect syntax near '11.'. The number 11 is a part of European form of date 24.12.2018
The database works OK. Only need this filter problem to solve.
Try:
cmd = New SqlCommand("Select * FROM Cisnik WHERE Datum = '" & cdate(label3.Text).ToString("yyyy-MM-dd") & "'", con)
Your query will be:
Select * FROM Cisnik WHERE Datum = '2018-11-11'
(date example)
In the below comparing two dates and fetching data.But from the form am getting two date correctly and it was showing an error datatype mismatch any one please help me how to resolve this issuse.
Form.vb:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
provider = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source="
dataFile = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
connString = provider & dataFile
myConnection.ConnectionString = connString
myConnection.Open()
Dim dt As New DataTable
Dim ds As New DataSet
ds.Tables.Add(dt)
Dim da As New OleDbDataAdapter
da = New OleDbDataAdapter("Select * from Add_Student Where Fee_Date between '" + DateTimePicker1.Value.ToString() + "' and '" + DateTimePicker2.Value.ToString() + "'", myConnection)
da.Fill(dt)
Add_StudentDataGridView.DataSource = dt.DefaultView
myConnection.Close()
End Sub
If you're using Access then the proper way to format date literals is the same way it's done in VB, i.e.
da = New OleDbDataAdapter("Select * from Add_Student Where Fee_Date between #" + DateTimePicker1.Value.ToString("d/MM/yyyy h:mm:ss tt") + "# and #" + DateTimePicker2.Value.ToString("d/MM/yyyy h:mm:ss tt") + "#", myConnection)
You should remove the time portion if you only want to compare the date.
Using & operators in expressions like that is hard to read though. Instead, you should use String.Format:
da = New OleDbDataAdapter(String.Format("Select * from Add_Student Where Fee_Date between #{0:d/MM/yyyy h:mm:ss tt}# and #{1:d/MM/yyyy h:mm:ss tt}#",
DateTimePicker1.Value,
DateTimePicker2.Value),
myConnection)
or, in recent versions of VB, string interpolation:
da = New OleDbDataAdapter($"Select * from Add_Student Where Fee_Date between #{DateTimePicker1.Value:d/MM/yyyy h:mm:ss tt}# and #{1:d/MM/yyyy h:mm:ss tt}#",
myConnection)
Of course, the best option is to not use any type of string concatenation and use parameters instead:
da = New OleDbDataAdapter($"Select * from Add_Student Where Fee_Date between #StartDate and #EndDate",
myConnection)
With da.SelectCommand.Parameters
.AddWithValue("#StartDate", DateTimePicker1.Value)
.AddWithValue("#EndDate", DateTimePicker2.Value)
End With
Click here for more information on using ADO.NET parameters.
Note: I think that Access supports "h:mm:ss tt" for time but, if not, try "HH:mm:ss".
I am trying to take data from the database to the grid. The condition is SELECT * FROM entries WHERE edate='" & Me.dtpDate.Value.Date & "'" But I am getting the error message Data type mismatch in criteria expression. Please see the code below. Also I have attached a screenshot of the error message.
Private Sub dtpDate_Leave(ByVal sender As Object, ByVal e As System.EventArgs) Handles dtpDate.Leave
'GetDayBookOpeningBalance()
If Me.lblHeading1.Text <> "Daybook entry" Then
Using MyConnection As OleDb.OleDbConnection = FrmCommonCodes.GetConnection(),
MyAdapter As New OleDb.OleDbDataAdapter("SELECT * FROM entries WHERE edate='" & Me.dtpDate.Value.Date & "'", MyConnection)
'Format(Me.dtpDate.Value.Date, "dd/MM/yyyy"))
If MyConnection.State = ConnectionState.Closed Then MyConnection.Open()
Using MyDataSet As New DataSet
MyAdapter.Fill(MyDataSet, "entries")
Me.grdDayBook.DataSource = MyDataSet.Tables("entries")
Dim DataSetRowCount As Integer = MyDataSet.Tables("entries").Rows.Count
If DataSetRowCount > 0 Then
SetGridProperty()
Else
ShowBlankGrid()
FrmCommonCodes.MessageDataNotFound()
End If
End Using
End Using
Else
ShowBlankGrid()
End If
End Sub
This is exactly what could happen for not using parameterized queries.
I bet that your column edate is a column of type Date/Time but you concatenate your Me.dtpDate.Value.Date to the remainder of your sql string command.
This forces an automatic conversion from DateTime to String but the conversion is not as your database would like to see.
If you use a parameter there is no conversion and the database engine understand exactly what you are passing.
Dim sqlText = "SELECT * FROM entries WHERE edate=#dt"
MyAdapter As New OleDb.OleDbDataAdapter(sqlText, MyConnection)
MyAdapter.SelectCommand.Parameters.Add("#dt", OleDbType.Date).Value = Me.dtpDate.Value.Date
....
Public Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
MyConn = New OleDbConnection
MyConn.ConnectionString = connString
ds = New DataSet
tables = ds.Tables
If R2.Checked Then
da = New OleDbDataAdapter("Select * from [maint] where
[centrale]='" & centralev.Text & "' ", MyConn) 'Change items to your
database name
End If
If R1.Checked Then
da = New OleDbDataAdapter("Select * from [maint] where
datevisite='" & dateintervention.Value.ToShortDateString() & "' ",
MyConn) 'Change items to your database name
End If
da.Fill(ds, "maint") 'Change items to your database name
Dim view As New DataView(tables(0))
source1.DataSource = view
DGV.DataSource = view
End Sub
End Class
I used 2 buttonradio to select criteria of search , I have problem with date search, Data type mismatch in criteria expression.
try to change
incorrect
da = New OleDbDataAdapter("Select * from [maint] where
datevisite='" & dateintervention.Value.ToShortDateString() & "' ",
MyConn) 'Change items to your database name
correct
da = New OleDbDataAdapter("Select * from [maint] where
datevisite='" & dateintervention.Value.ToString("yyyy-MM-dd") & "' ",
MyConn) 'Change items to your database name
Example for format
Expanding on Plutonix comment to your question you can try:
Dim cmd = New OleDbCommand("Select * from [maint] where datevisite = ?")
Dim param = New OleDbParameter("#datevisite", OleDbType.Date)
param.Value = dateintervention.Value
cmd.Parameters.Add(param)
da = New OleDbDataAdapter (cmd, MyConn)
In this way ADO.NET will take care for you to replace the question mark in the query text with the proper date value formatted as required by OleDb syntax. You entirely avoid string concatenation errors and you don't need to learn any formatting rule for all available OleDb data types.
Besides it should be safer.
I'm a student currently doing my programming coursework. I am trying to get the MemberID from the Access database using a button in my DataGridView, but I end up with an error Data type mismatch in criteria expression when I select the member I wish to view. This is my code below:
Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
Dim Member As String
Dim ds As New DataSet
Dim da As OleDb.OleDbDataAdapter
da = New OleDb.OleDbDataAdapter(Query, Conn)
Connect = "PROVIDER=Microsoft.ACE.OLEDB.12.0;Data Source = \\DRS-SR-002\RMShared Documents\Computer Programming\Programs\year13\Kevin\Project\Database tables\DBTables.accdb"
Conn = New OleDb.OleDbConnection(Connect)
If e.ColumnIndex <> 4 Then
Exit Sub
End If
Dim MemberSelectedID As String = DataGridView1.Rows(e.RowIndex).Cells(0).Value
GroupBox1.Show()
Query = "SELECT MemberID FROM tblMember WHERE [MemberID] = """ & MemberSelectedID & """"
Conn.Open()
da = New OleDb.OleDbDataAdapter(Query, Conn)
da.Fill(ds, "Selected Member")
Conn.Close()
Member = ds.Tables("Selected Member").Rows(0).Item(0)
TextBox1.Text = Query
End Sub
Your Query is wrong.
It should be like this.
Query = "SELECT MemberID FROM tblMember WHERE [MemberID] = " & MemberSelectedID
OR
Query = "SELECT MemberID FROM tblMember WHERE [MemberID] = '" & MemberSelectedID & "'"
MemberID field is Integer so no need to specify it as string.
In SQL Server single quote ' is used to specify string not double quote ".
You are getting the MemberSelectedID from the DataGridView as String and then using it to query the database, on which I assume that it is defined as Numeric. That's the reason of the data type mismatch error
Try:
Dim MemberSelectedID As Integer = DataGridView1.Rows(e.RowIndex).Cells(0).Value
And
Query = "SELECT MemberID FROM tblMember WHERE MemberID = " & MemberSelectedID