WebMatrix :: Calculated Field (column) In WebGrid
Dec 15, 2010Is there a way to have a calculated column (field) in a webGrid in webMatrix?
View 4 Replies
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[Code]....
In my form I have this code. What changes below do I need to make to have the value of Date in XXXX?
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:sqlConnection %>"
SelectCommand="SELECT NumPeople, Date1,Time1,Venue FROM People_Count WHERE ((Date1=@ArvDate and Time1 >= '06:00:00.000') or (Date1=XXXX and Time1 <= '06:00:00.000')) and Venue='F & B' ORDER BY Date1 ASC, Time1 ASC">
<SelectParameters>
<asp:QueryStringParameter Name="ArvDate" QueryStringField="ArvDate" />
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Car class:
[MetadataType(typeof(CarMetadata))]
public partial class Car
{
// car implementation
}
Car metadata class:
public class CarMetadata
{
[DisplayName("Car Name")]
[StringLength(100, ErrorMessageResourceType = typeof(ValidationText), ErrorMessageResourceName="CarNameDescriptionLength")]
[Required]
public string CarName { get; set; }
}
View contents:
@model List<Car>
...
var grid = new WebGrid(Model, canPage: true, rowsPerPage: 10);
grid.Pager(WebGridPagerModes.NextPrevious);
@grid.GetHtml(
htmlAttributes: new { id = "grid" },
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));
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My question is as this.
1.) in order to get my calculated field i had to load my data into a table (as suggested)
2.)Add a column to the table and perform calculations
3.)make a dataview from the tables because i could not get the Gridview.datasource= ds.tables("loads").select("Deadhead <= " & sngRadius
4.)the largest of the 3 tables my query is based on contains about 7000 records. The way i have the logic & programming now everytime a new "truck location" is put in the textbox1 and "find loads/button1" is clicked. It calculates the deadhead miles of all 7000 records before filtering. I am filtering based on the deadhead miles.
Does anyone have any recomendation about how to speed this up a bit.
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Would i see a performance increase if i installed SQL or mySQL and create linked tables to the ones i use in access. or would access still be the bottleneck?
I don't know if the performance increase would be negligible as i still ultimately be getting the data from Access.
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[Code]....
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