Solved

GridView Sort by Cell Text instead of SQL data

Posted on 2008-10-08
3
636 Views
Last Modified: 2012-05-05
I have a gridview populated via a SqlDataSource.  It pulls data from a 'Companies' table, including columns such as 'OwnerID', 'CoordinatorID', 'ContactPersonID', etc.  

Since I want names displayed instead of IDs for these columns, I used template fields within the gridview to perform functions that lookup the names in other tables using the ID values and return them to the templates.  This creates a problem when trying to sort the gridview, since it's sorting with the data IDs instead of the names that I've manually inserted.  

I'd prefer to keep the SQL the same so that I don't have to maneuver a bunch of messy joins into my query.  

Any suggestions?
HTML:
 
            <asp:GridView ID="ReportGrid" runat="server" AutoGenerateColumns="False" DataKeyNames="CompanyID" OnSorting="GridView1_Sorting"
                AllowSorting="True" BorderColor="#E0E0E0" CellPadding="2" Font-Names="Arial" Font-Size="10pt" Font-Strikeout="False" DataSourceID="MyDataSource">
                <Columns>
                    <asp:BoundField DataField="CompanyID" HeaderText="CompanyID" InsertVisible="False"
                        ReadOnly="True" SortExpression="CompanyID" Visible="False" />
                    <asp:BoundField DataField="Name" HeaderText="Company Name" SortExpression="Name" />
                    <asp:BoundField DataField="CreatorID" HeaderText="CreatorID" SortExpression="CreatorID"
                        Visible="False" />
                    <asp:BoundField DataField="CreatedDate" HeaderText="CreatedDate" SortExpression="CreatedDate"
                        Visible="False" />
                    <asp:TemplateField HeaderText="OwnerID" SortExpression="OwnerID">
                        <ItemTemplate>
                            <asp:Label ID="Label1" runat="server" Text='<%# GetName(Eval("OwnerID").ToString()) %>'></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="CoordinatorID" SortExpression="CoordinatorID">
                        <ItemTemplate>
                            <asp:Label ID="Label4" runat="server" Text='<%# GetName(Eval("CoordinatorID").ToString()) %>'></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="LastModifiedID" SortExpression="LastModifiedID" Visible="False">
                        <ItemTemplate>
                            <asp:Label ID="Label2" runat="server" Text='<%# GetName(Eval("LastModifiedID").ToString()) %>'></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:BoundField DataField="LastModifiedDate" HeaderText="LastModifiedDate" SortExpression="LastModifiedDate"
                        Visible="False" />
                    <asp:BoundField DataField="Status" HeaderText="Status" SortExpression="Status" />
                    <asp:TemplateField HeaderText="Contract Type" InsertVisible="False" SortExpression="CompanyID">
                        <ItemTemplate>
                            <asp:Label ID="Label5" runat="server" Text='<%# GetContractInfo(Eval("CompanyID").ToString(), "ContractType") %>'></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns>
            </asp:GridView>
            <asp:SqlDataSource ID="MyDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:MyConnectionString %>" SelectCommand="SELECT * FROM [Companies]"></asp:SqlDataSource>
 
 
Code Behind:
 
 
    Public Function GetName(ByVal ID As String) As String
 
        Dim Name As String = "Unknown"
 
        Dim conn As New SqlClient.SqlConnection(ConnectionString)
        Dim rdrQuery As String = "Select FirstName + LastName FROM Users WHERE UserID='" & ID & "'"
        conn.Open()
        Dim cmd As New SqlClient.SqlCommand(rdrQuery, conn)
        Dim rdr As SqlClient.SqlDataReader = cmd.ExecuteReader()
        Try
            While rdr.Read()
                Name = rdr.Item(0)
            End While
        Catch ex As Exception
        Finally
            conn.Close()
        End Try
 
        Return Name
 
    End Function
 
    Public Function GetContractInfo(ByVal CompanyID As String, ByVal Field As String) As String
 
        Dim Value As String = "Unknown"
 
        Dim conn As New SqlClient.SqlConnection(ConnectionString)
        Dim rdrQuery As String = "Select " & Field & " FROM Contracts WHERE CompanyID='" & CompanyID & "' And IsMain=1"
        conn.Open()
        Dim cmd As New SqlClient.SqlCommand(rdrQuery, conn)
        Dim rdr As SqlClient.SqlDataReader = cmd.ExecuteReader()
        Try
            While rdr.Read()
                Value = rdr.Item(0)
            End While
        Catch ex As Exception
        Finally
            conn.Close()
        End Try
 
        Try
            Value = Format(CDate(Value), "MM/dd/yyyy")
        Catch ex As Exception
        End Try
 
        Return Value
 
    End Function

Open in new window

0
Comment
Question by:askrenes
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 37

Expert Comment

by:samtran0331
ID: 22670000
>>I used template fields within the gridview to perform functions that lookup the names

With what you have, each row in the grid is going to make 4 separate database calls to get the name based on an id...
So if you have 20 rows, you're going to make 80 database calls ...

quite honestly, you're much much better off doing the joins in the sql
0
 

Author Comment

by:askrenes
ID: 22670043
That's a valid point.  Can you suggest a query (based on the info I have in the code)?  I'm not very good with joins.  
0
 
LVL 37

Accepted Solution

by:
samtran0331 earned 500 total points
ID: 22671706
So it looks like all "users" regardless of being the Owner, Coordinator, or Last Modified...they are all in the "Users" table correct?

Run the below in query analyzer and see if the results are what you expect.

SELECT 
	Companies.*,
	Users.FirstName + Users.LastName AS OwnerName, 
	Users_1.FirstName + Users_1.LastName AS CoordinatorName, 
	Users_2.FirstName + Users_2.LastName AS LastModifiedName, 
	Contracts.ContractType
FROM         
	Companies LEFT OUTER JOIN
	Users AS Users_2 ON Companies.LastModifiedID = Users_2.UserID LEFT OUTER JOIN
	Contracts ON Companies.CompanyID = Contracts.CompanyID LEFT OUTER JOIN
	Users AS Users_1 ON Companies.CoordinatorID = Users_1.UserID LEFT OUTER JOIN
	Users ON Companies.OwnerID = Users.UserID
WHERE     
	(Contracts.IsMain = 1)

Open in new window

0

Featured Post

Enroll in June's Course of the Month

June's Course of the Month is now available! Every 10 seconds, a consumer gets hit with ransomware. Refresh your knowledge of ransomware best practices by enrolling in this month's complimentary course for Premium Members, Team Accounts, and Qualified Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

One of the pain points with developing AJAX, JavaScript, JQuery, and other client-side behaviors is that JavaScript doesn’t allow for cross domain request for pulling content. For example, JavaScript code on www.johnchapman.name could not pull conte…
ASP.Net to Oracle Connectivity Recently I had to develop an ASP.NET application connecting to an Oracle database.As I am doing it first time ,I had to solve several problems. This article will help to such developers  to develop an ASP.NET client…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.

691 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question