Hello,
Running VB.net and using an Access MDB as the backend database. Connection string for database is:
I'm trying to do a select query to get all of the results where StartTime is between two dates. StartTime is a column in the Access DB of type Datetime. It contains both the date and time information, so I'm attempting to use the SQL command DateValue to strip off the time. However, this isn't working when I use parameters with the query.
For example, this doesn't return any results:
However, if I change the query string to the value of pEnd (without using a parameter), then this successfully returns the results I am looking for:
Here is a sample of the database table:
![Name: 2023-03-18 12_15_58-Window.png
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Any ideas what I am doing wrong with the first option?
Running VB.net and using an Access MDB as the backend database. Connection string for database is:
Code:
OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0 ;Data Source=db.mdb")For example, this doesn't return any results:
Code:
Dim query As String = "SELECT * FROM Shifts WHERE DateValue(StartTime) >= @startperiod AND DateValue(StartTime) <= @endperiod;"
Dim pStart As New DateTime(2023, 3, 1)
Dim pEnd As New DateTime(2023, 3, 15)
Dim cmd As OleDbCommand = New OleDbCommand(query, cn)
cmd.Parameters.AddWithValue("@startperiod", pStart)
cmd.Parameters.AddWithValue("@endperiod", pEnd)
'run cmd.ExecuteReader, and go through the results, etcCode:
Dim query As String = "SELECT * FROM Shifts WHERE DateValue(StartTime) >= @startperiod AND DateValue(StartTime) <= @endperiod;"
Dim pStart As New DateTime(2023, 3, 1)
Dim pEnd As New DateTime(2023, 3, 15)
query = query.Replace("@endperiod", "#" & pEnd.ToShortDateString & "#")
Dim cmd As OleDbCommand = New OleDbCommand(query, cn)
cmd.Parameters.AddWithValue("@startperiod", pStart)
'run cmd.ExecuteReader, and go through the results, etcAny ideas what I am doing wrong with the first option?
