ADO.NET :: Difference Between Select And Select New In Linq Query
Aug 17, 2010What is difference between select { } and select new {} In Linq Query
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Similar Messages:
Linq Query - How To Select Inner Query Into List
Oct 17, 2010I am writing a linq query to select a blogpost,
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The blogpost i am testing got 3 tags attached to it. The table structure is:
(table)BlogPost -> (table)BlogPostTags <- (table)Tags
So the BlogPostTags table only contains 2 fields, BlogPostID and TagID.
When i run the query above i get 3 results back. Same blogpost 3 times but with 1 tag in each. It should return 1 post with 3 tags. The problem lies in the Tags query above.
C# - Delaying Linq To SQL Select Query Execution
Jun 14, 2010I'm building an ASP.NET MVC site that uses LINQ to SQL. In my search method that has some required and some optional parameters, I want to build a LINQ query while testing for the existence of those optional parameters.
Here's what I'm currently thinking:
using(var db = new DBDataContext())
{
IQueryable<Listing> query = null;
//Handle required parameter
query = db.Listings.Where(l => l.Lat >= form.bounds.extent1.latitude && l.Lat <= form.bounds.extent2.latitude);
//Handle optional parameter
if (numStars != null)
query = query.Where(l => l.Stars == (int)numStars);
//Other parameters...
//Execute query (does this happen here?)
var result = query.ToList();
//Process query...
Will this implementation "bundle" the where clauses and then execute the bundled query? If not, how should I implement this feature?
ADO.NET :: LINQ If Statement Inside Select New Query?
Aug 18, 2010My application includes BUILDING table with columns BUILDING_ID, NAME, TOWN_ID, I run the LINQ query listed below and need to append two letters to buildings.NAME based on TOWN_ID. I assume that I need to place an "if" or "select" statement inside the query but I can not figure out how to do that,
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Select Query In LINQ Based On Foreign Table
Mar 2, 2011I have 2 Tables , OrderDetails and Requests In my LINQ to SQL dbml file. OrderDetailsID is a foreign key in Requests Table. I want to write the query to get the sum of UnitCost from OrderDetails based on OrderId. And If there is a row in Requests Table for each OrderDetailsID, and the Requests.Last.RequestType="Refund" I want to reduce the total refund amount from the main sum otherwise If there is no row based on OrderDetailsID, add to sum. Here is the way I implement that. I am looking to prevent using "For each".
iRefund = (From od1 In dc.OrderDetails _
Where od1.OrderID =1 _
Select od1.UnitCost).Sum
Dim objOrderDetails = (From od1 In dc.OrderDetails _
Where od1.OrderID =1 _
Select od1)
For Each OrderDetail As ORM.Entities.OrderDetail In objOrderDetails
If Not OrderDetail.Requests Is Nothing Then
IF OrderDetail.Requests.Last.RequestType="Refund" Then
iRefund -= OrderDetail.UnitCost
End If
End If
Next
ADO.NET :: Select Query For Linq On Default.aspx.cs Page?
Oct 9, 2010how do i create linq query and asign that query to as data source to datalist on default.aspx.cs page
View 3 RepliesADO.NET :: LINQ Query To Select Objects Containing Collection Of Keyword In A Property?
Dec 16, 2010I'm new to linq. here is the scenario i need to write query for.I have a "Candidate" table with a varchar property "Skill"I have the table OR-mapped with LINQ to SQL on dbml file. Now I want to write linq query that:Selects all Candidates that have skill containing any of the keywords from ("asp.net","php","java")
View 1 RepliesWeb Forms :: Select CheckBoxList Items Based On LINQ Query Results
Apr 29, 2010[Code]....
using System;
using System.Collections.Generic;
using System.Linq;
using System.Data.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace find.Admin
{
public partial
class WebForm1 : System.Web.UI.Page
{
private
class servicetimeofday
{
public int servicetimeofdayid {
get; set; }
public int serviceid {
get; set; }
public int timeofdayid {
get; set; }
}
protected void Page_Load(object sender,
EventArgs e
{
List<servicetimeofday> servicetimesofday =
new
List<servicetimeofday>
{
new servicetimeofday() { servicetimeofdayid = 1, serviceid = 1, timeofdayid = 1 },
new servicetimeofday() { servicetimeofdayid = 2, serviceid = 1, timeofdayid = 2 },
new servicetimeofday() { servicetimeofdayid = 3, serviceid = 2, timeofdayid = 1 },
new servicetimeofday() { servicetimeofdayid = 4, serviceid = 2, timeofdayid = 3 }
};
GridView2.DataSource = servicetimesofday;
GridView2.DataBind();
var itemstocheck = from
servicetimeofday in servicetimesofday
where servicetimeofday.serviceid == 2
select ne
servicetimeofday.timeofdayid
};
GridView3.DataSource = itemstocheck;
GridView3.DataBind();
foreach (var timeofdayid
in itemstocheck)
{
foreach (ListItem i
in CheckBoxList2.Items)
{
if (i.Value == timeofdayid.ToString())
{ i.Selected =
true; }
}
}
}
}
}
DataSource Controls :: Linq Query To Select Parent Records Which Have Related Children
Jan 19, 2010I have a basic CMS which I'm adding to a site to display some downloads organised into groups. I have two tables, one for the groups and one for the downloads. I'm using a repeated to display the groups with another repeater inside to display the children. This works perfectly.
However some of my download groups may not have any downloads related to them and I'd like to handle this by filter the groups so that only those with a relate download record(s) are shown.
I'm trying to do this with the query which populates the top repeater based on some ideas I read but I must be going wrong with the syntax.
Here is what I'm using to try and only select downloads groups which have downloads linked to them by the download group ID.
[Code]....
Can anyone offer any thoughts on how I should construct the query to perform this?
ADO.NET :: Sql Query Select Inside A Select Statement?
Dec 2, 2010i have two tables named
1.LookupPageInfo and (LookupPageInfoId,pathmessageID,pagemessageID)
2.Messages (MessageId,MessageText,ChannelID)
Now i need to write a query something like this........in the query i need to pass the pathmessageid and needs to get messagetext from Messages Table,i am not sure how i need to write the below query..can someone guide me how can i write a query......as below..
select LookupPageInfoId,
PathMessageID,
pagemessageID,
(select messagetext from Messages where MessageID=PathmessageId) as TEXT from LookupPageInfo
SQL Server :: Select Second Query If First Query Returns Nothing?
Oct 14, 2010How can I SELECT second if first SELECT returns nothing?
View 8 RepliesADO.NET :: Using Where Clause Before Select In LINQ?
Aug 26, 2010why use where condition before select statement in LINQ
View 2 RepliesC# - Use Linq To Sql To Select One Column From Row?
Dec 18, 2010I am using this C# with linq to sql:
string currentLabel = from s2f in stream2FieldTypesTable
where s2f.s2fID == item.s2fID
&& (s2f.s2fLabel != item.s2fLabel || s2f.s2fIsRequired != item.s2fIsRequired)
select s2f.s2fLabel;
I am getting a compiler error saying i can't assign type System.Linq.IQueryable<string> to string.
I tried this code:
string currentLabel = from s2f in stream2FieldTypesTable
where s2f.s2fID == item.s2fID
&& (s2f.s2fLabel != item.s2fLabel || s2f.s2fIsRequired != item.s2fIsRequired)
select s2f.s2fLabel.ToString();
And that returns the same error. I'm sure this is a simple thing. what am I missing? I just want the first s2fLabel that matches the where clause.
C# - LINQ To SQL Dynamic Select?
Jun 7, 2010how to indicate which columns I would like returned at run-time from a LINQ To SQL statement?I am allowing the user to select items in a checkboxlist representing the columns they would like displayed in a gridview that is bound to the results of a L2S query.I am able to dynamically generate the WHERE clause but am unable to do the same with the SELECT piece. Here is a sample:
var query = from log in context.Logs select log;
query = query.Where(Log => Log.Timestamp > CustomReport.ReportDateStart);
query = query.Where(Log => Log.Timestamp < CustomReport.ReportDateEnd);
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ADO.NET :: Linq Select Null Value?
Oct 7, 2010[Code]....
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I have to get the maximum of these two select values. The select values are nullable. How do I go about checking if the value is null before calling the Max() method on it? I tried the ?? coalesing operator (example: e.HomeSales.Max() ?? 0M,) but I get the following error:"Operator '??' cannot be applied to operands of type 'decimal' and 'decimal'"
Forms Data Controls :: How To Display Records After Going Through The Query Builder And Select "Test Query"
Nov 5, 2010I have a SQL Data Source that displays records after going through the Query Builder and select "Test Query" yet when I save it, go back to the design mode and select View in Browser I get nothing but a blank screen.
View 3 RepliesADO.NET :: SQL Query Using ASP Label In SELECT
Jan 4, 2011I'm trying to write a SQL Query that will grab items from a database that match the username of the currently logged in user. They are logging in using Active Directory credentials through a forms-based login page. I decided to create an ASP Label that will hold the username of the person who has logged in and the login status control, code:
[Code]....
I added a statement to the Page_Load event that should automatically populate the field with that user's name, code:
[Code]....
However, I get the error "System.Data.SqlClient.SqlException: The multi-part identifier "lblUn.Text" could not be bound." when I attempt to load the page after logging in. How can I fix this? Also, I might need to place this in a separate thread, but can someone check my SQL Syntax on the query? I'm not fully convinced it will work properly when I go to load the page. Code:
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Get The Value From SELECT Query From A Table?
Mar 23, 2011how to get the value from SELECT query from a table
protected void Button_Click(object sender, EventArgs e)
{
string select_qry = "SELECT ID, USER, FILE, DATE, LASTUSED from FILE_INFO where USER = '" + user + "'"; // ID is primary key
SqlCommand cmd = new SqlCommand(select_qry);
GridView1.DataSource = GetData(cmd);
GridView1.DataBind();
}
private DataTable GetData(SqlCommand cmd)
{
DataTable dt = new DataTable();
SqlDataAdapter sda = new SqlDataAdapter();
cmd.CommandType = CommandType.Text;
cmd.Connection = conn1;
conn1.Open();
sda.SelectCommand = cmd;
sda.Fill(dt);
return dt;
}
I have different USERS I want to get ID of user if user is different say 'Sheena' has ID value from 1-10 but if user is 'Sara' and she is having ID from 11-20 so I want to get specially ID of particular user how do I get ID from select query can any one know)
ADO.NET :: Linq To Sql Select Table At Runtime
Mar 15, 2011I have several tables to load from depending on a string value using Linq to Sql I currently have
[Code]....
but of course that only gets the specific table DOffices if I wanted to grab tables at runtime what would be the best way to go about it?
ADO.NET :: Select Using Stored Procedure In Linq To Sql?
Jan 30, 2011i am using stored proc in linq to sql but i have done insert & delete operations but im unable to do the select operation i have tried but no use,whenever i enter the id into the textbox it should display the record?
View 5 RepliesDataSource Controls :: Programmatically Setting ODS Select Method And Select Parameters?
Dec 22, 2010The drop down list is used to determine what search criteria will be used to find an invoice. I tried to set the Select method in the switch statement. I don't understand how to set the Select Method and the select parameters programmatically though . I tried a few different ways but can't make the compiler happy. My ODS is in scope in the code behind. I'm not able to access it's properties though. The BAL resides in a separate project that is a ClassLibrary. I also have a using statement for the ClassLibrary project in the code behind.
give me an example of how to do this?
Mark up:
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DataSource Controls :: Select / Returns Error No Overloading Method For Select?
May 9, 2010protected void Button19_Click(object sender, EventArgs e)
{
SqlDataSource conn = new SqlDataSource();
conn.ConnectionString = ConfigurationManager.ConnectionStrings["Database2ConnectionString1"].ToString();
conn.SelectCommandType = SqlDataSourceCommandType.Text;
conn.SelectCommand = "SELECT FROM table1 (a, b)VALUES(@a,@b)";
conn.SelectParameters.Add("a",TextBox1.Text);
conn.SelectParameters.Add("b", TextBox2.Text);
int rowsAffected = 0;
try
{
rowsAffected = conn.Selectt();
}
catch (Exception)
{
Label1.Text = "Error";
}
finally {
conn = null;
}
if (rowsAffected != 0)
{
Label1.Text = "Data saved";
}
}
well it returns error no overloading method for select (P.S. same code work fine for insert)
ADO.NET :: Ado And Access - Sum Query SELECT SUM() As Total
Dec 31, 2010Need to do a summary report of two items, sales and commissions by sales person, by date range. There are only a handful of salespeople. I messed around with SELECT SUM() for a few hours last night. It works easily, up until you need to do a few table joins, to say join on employee id to pull in names. Then it starts getting pretty convoluted, fairly quickly. Question is, is there maybe an easier way of doing this in asp.net than through the sql? It is Access, so I don't think LINQ will work, right? Just wondering if there isn't a quick, easy way of doing this that I don't know about.
View 2 RepliesDataSource Controls :: SQL Query With IF And Select
Feb 18, 2010SQL Query with IF and Select
View 2 RepliesSQL Server :: Select Query Not Working
Oct 14, 2010i have been having trouble trying to find out what is wrong with my sql select query... i wanted to select a sessionID by comparing the tourID and dates. the dates datatype at the database is datetime and the value of itemSessionDate is in string. i tried to convert itemSessionDate to date and dateAndTime but it gave me mm/dd/yyyy while the date in my database is dd/mm/yyyy hh:mm:ss. so i thought i can try using the itemSessionDate string as it has the same value as the one return from the database. but it keeps on goin to the if not reader.hasRows and quit the statement
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