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gettting operand type clash: int is incompatible with date when using vb.net

Posted on 2015-02-22
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Last Modified: 2015-02-22
I have the following:
1) in a table called tables I have a Date column that is of type date
2) I added the date as 2/20/2015

then I have in my vb code behind the following:
Imports System.Data.SqlClient

Partial Class main
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load

        Dim ConnectionString As String = System.Web.Configuration.WebConfigurationManager.ConnectionStrings("dbconn").ToString()
        Dim dateval As Date = Now.Date


        Dim MyConn As New System.Data.SqlClient.SqlConnection(ConnectionString)
        Dim MyComm As New System.Data.SqlClient.SqlCommand("SELECT * FROM [dbo].[Table] WHERE date= " + dateval, MyConn)

        MyConn.Open()
        Dim DataReader As System.Data.SqlClient.SqlDataReader = MyComm.ExecuteReader()

        While (DataReader.Read())

            box1_lbdate_1.Text = DataReader("Date").ToString
            box1_lbdoc_1.Text = DataReader("Doc1_Name").ToString
            box1_lbtime_1.Text = DataReader("doc1_time").ToString
            box1_docname_2.Text = DataReader("doc2_name").ToString
            box1_doc2time.Text = DataReader("doc2_time").ToString

            If String.IsNullOrWhiteSpace(box1_docname_2.Text) Then
                box1_docname_2.Visible = False
                box1_doc2time.Visible = False
            End If


        End While
        DataReader.Close()
        MyConn.Close()



    End Sub
End Class

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my goal is to parse the database for the current date and apply it to the box labels accordingly

I keep getting the error mentioned. do I need to do Cdate() ?
0
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Question by:bbimis
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8 Comments
 

Author Comment

by:bbimis
ID: 40624626
well I figured that out by adding "'" + dalval + "'"

but now I get the whole date including the time and not sure why cause I'm only calling now.date
0
 
LVL 12

Assisted Solution

by:FarWest
FarWest earned 250 total points
ID: 40624640
Date type includes is datetime in SQL
If you set the value to date part the 12:00 is assumed as time
0
 

Author Comment

by:bbimis
ID: 40624645
so how do I get the date only?
I tried
Dim dateval As Date = System.DateTime.Today.ToString("dd/mm/yy")

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do I need to set the type in the database to something else?
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LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 250 total points
ID: 40624694
The pattern you are taking with building your query is a recipe for SQL Injection attacks. While this particular instance isn't so bad, if you repeat this behavior using input taken directly from a user, then your application will be vulnerable. You should prefer to use parameterized queries instead.
0
 

Author Comment

by:bbimis
ID: 40624696
I got it had to take the .tostring off the DataReader("date")
0
 

Author Closing Comment

by:bbimis
ID: 40624700
thanks and I agree on the sql injection issue and will keep that in mind. thanks!
0
 
LVL 49

Expert Comment

by:PortletPaul
ID: 40624810
Be very careful please

How the dbms interprets that sting format will depend on the dbms vendor and (worse) the settings of that dbms.

I will assume you are using Microsft SQL Server.

dd/mm/yy

is NOT a good string format to use.
a. always use 4 digit years
b. never assume month first

the safest possible sting representation of a date in SQL Server is:

YYYYMMDD

(no! delimiters)


Dim dateval As Date = System.DateTime.Today.ToString("yyyymmdd")

& then you SQL will be executed as

SELECT * FROM [dbo].[Table] WHERE date= '20150223'

nb: if the dbms is not SQL Server the approach would differ
0
 
LVL 49

Expert Comment

by:PortletPaul
ID: 40624815
sorry, there was a lot of traffic I hadn't seen when I posted. (I didn't refresh the page, "my bad")
0

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