DataSource Controls :: How To Select Only Certain Columns With LINQ
May 11, 2010
If I have a linq statement like:
[Code]....
There may be a lot of data in the Blogs table. What if all I wanted was say BlogID, BlogTitle and BlogAuthor and nothing else, is there a way to do this in an effort to make the sql more efficent?
Along the same lines in my DataContext (.dbml) file I added some associations between some of my tables. This makes coding nice when I do a linq statement that will join those tables automatically for me but my concern is does it do that everytime, thus making all my linq quieries inefficient?
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Similar Messages:
May 8, 2010
how to write that below query in linq
DECLARE @Name varchar(20)
Select @Name = empFirstname+','+empLastName+','+empBankCode From srpEmployee
PRINT @Name
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May 18, 2010
How do I select multiple columns into IQueryable<Employee>?
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Apr 9, 2010
Is there a way to do a
"select * as"
and rename all columns with some prefix, rather than having to name columns individually? Or better yet, when doing a join and getting all columns from both tables, how do you identify them uniquely in the VB where some columns have the same name?
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Apr 19, 2010
I have just started using LINQ with VS2008. I have added extra columns to my table, saved the changes, but class ClassName.Designer.CS didn't get updated. What do I have to do to updated the class? Do I have to do it manually, or is there a way to automatically synchronize tables and ClassName.Designer.CS?
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Jan 2, 2010
there are multiple rows with same SubContact_No and with same value of some columns. for a single column I am firing query like
Select distinct (Financial_Status) from mtblSub_Contract where SubContract_No=@SubContract_No";
it's working fine.... (it's ok with a Single column)
But Now I need multiple columns value so how to query for this.
Select distinct (Financial_Status, colums2, column3) from mtblSub_Contract where SubContract_No=@SubContract_No"; is not working
So how to do that.
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May 7, 2010
I would like to select some columns from a Datatable, I mean, something like Select Name, Surname, ID,
I'm trying to do something like this:
DataTable dtExcel = new DataTable();
DataRow[] buena = dtExcel.Select("NAME");
in order to get only a view or table with one column (NAME).
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May 14, 2010
This question is for wrapping up work on a database driven AJAX AutoComplete Control that I am using to provide keyword hints to user on search pages. Each record has 6 columns for keywords where each column is for an advertiser to add a keyword. These are used in meta keywords tags, but I also want to use them for AutoComplete. The problem is that I don't know how to write a SELECT statement in Visual Studio that treats all 6 keyword columns as if they were all one column. I am looking for something like
SELECT (keyword1 + keyword2 + keyword3) AS Keywords
FROM (Merchandise)
WHERE Keywords LIKE @term
The only other thing I can think of the gain this level of functionality would be to combine them into a new table.
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Apr 6, 2010
i have DateFrom and DateTo columns in tblLOgs.if they both are same then select only DateFrom else both selects.my procedure is ....do modification in them
[Code]....
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Jan 5, 2010
I am trying to select data with Linq and bind to a DDL. The custid field allows duplicates in this table, but I only want unique values in the ddl. I tried the following code:
[Code]....
The use of "Select Customer.CustID", with or without the Distinct, causes this runtime error. CustID is a valid field in the table, and it shows up in intellinsense and compiles. If I just Select Customer, the error goes away, but Distinct doesn't know to look for distinct custid's.
DataBinding: 'System.String' does not contain a property with the name 'CustID'.
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May 19, 2010
I'm using ASP.NET MVC to create a small web apllication.
Here is my database And here is my class
[Code]....
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Jun 16, 2010
I want use select * from sample (tablename) ,which returns only those columns from sample table which does not have xml data type.
note : sample table contains some columns which have xml data type .
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Feb 9, 2010
Mmy data table has four columns. How can I get only selected columns name?
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Jan 19, 2010
I 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?
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Jan 11, 2010
I am trying to create a multi column listbox by combining fields in Linq select statement, as Let Name = Last + First. The problem is how to pad the Last column with spaces as you would in SQL using REPLICATE so when I bind the listbox to the data, it looks like two columns.
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Mar 18, 2010
in asp.net page user able to select gridview Columns, and it will hide remaining columns and that selection done by check box with column list bellow is Image link , what exactly I am looking for [URL] it look bellow after selection of column done [URL]
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Jun 29, 2010
how can i select a record from A table and insert into B table using linq?
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Sep 7, 2010
I'm new to Linq. I have searched and searched the web for a soluion, and can't find anything. I have a Linq query and I want to insert a row ("Select User") to the top before I pass it to the drop down list. I've been trying to use the Union but to now avail (it keeps telling me that my object doesn't support the Union method). My code, prior to attempting to inser a row, is very simple.
public SelectList DropDown_Users()
{
var context = new VivarianDataContext();
var query = from t in context.AspnetUsers
select new { t.UserId, t.LastName };
list = new SelectList(query.AsEnumerable(), "UserId", "LastName");
return list;
}
Now I try to insert a row and I found this on the internet and it seems to say that his solution will work. But it is filled with syntax errors. [URL]
I tried to implement it using the following code, but it doesn't compile.
public SelectList DropDown_Users()
{
SelectList list;
//get the original data
var context = new SQL2005633131VivarianDataContext();
var query = from t in context.AspnetUsers
select new { t.UserId, t.LastName };
//create a dummy table with an empty row
var AllUsers = new List<AspnetUsers>();
var BlankUser = new AspnetUsers()
{UserId=System.Guid.Empty, LastName="Select One"};
AllUsers.Add(BlankUser);
//use Union to join the data - ERRORS HERE
var newTable = AllUsers.Union(query);
list = new SelectList(newTable.AsEnumerable(), "UserId", "LastName");
return list;
}
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Apr 21, 2010
I have two columns first name and last name , that have duplicates, how can i remove the duplicates and only leave the distinct members intact?
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Dec 22, 2010
The 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:
[Code]....
[Code]....
[Code]....
[Code]....
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May 9, 2010
protected 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)
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Apr 14, 2010
I will declarate a attribute, but it gives me an error
This query works fine and returns 1 record from type int:
SELECT TOP 1 DataObjectVersionID
FROM tblDataObjectVersionPropertyValueText
WHERE PropValue like CAST('00010281' AS ntext)
ORDER BY DataObjectVersionID DESC
And when I will declarate a attribute/parameter it gives me an error:
DECLARE @dataObjectVersionId INT
SET @dataObjectVersionId = SELECT TOP 1 DataObjectVersionID
FROM tblDataObjectVersionPropertyValueText
WHERE PropValue like CAST('00010281' AS ntext)
ORDER BY DataObjectVersionID DESC
Error message:
Msg 156, Level 15, State 1, Line 2
Incorrect syntax near the keyword 'SELECT'.
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Mar 12, 2010
I am writing a plugin to help with a current ERP system we have that I am not allowed to modify the data structure at all. The table I am dealing with has over 100 columns and I am wanting to set my linq object propertychanged event and submitchanges or do I really have list out each property and set it equal to the new one?Below is an example of what I am trying to do:
[Code]....
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Mar 9, 2010
txtLastName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Last_Name.ToString();
Like that I have large number of controls on my form. I have dought, if I assigned like this, db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Last_Name.ToString(); to every control, then I have set of controls like,
ddlSalutation.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Salutation.ToString();
txtLastName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Last_Name.ToString();
txtFirstName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).First_Name.ToString();
txtMI.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Middle_Initial.ToString();
txtAddress.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Home_Address.ToString();
txtCity.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).City.ToString();
ddlState.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).State.ToString();
txtZip.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Zip_Code.ToString();
txtSSNo.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ssn.ToString();
txtMRNo.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Mr_No.ToString();
txtDOB.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Birth_Date.ToString();
RBGender.SelectedItem.Value = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Gender.ToString();
RBMaritalStatus.SelectedItem.Value = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Marital_Status.ToString();
txtHomePhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Home_Phone.ToString();
txtWorkPhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).WorkPhone.ToString();
txtCellPhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).CellPhone.ToString();
ddlSuffix.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Suffix.ToString();
txtReligion.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Religion.ToString();
txtEmail.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Email.ToString();
txtSSOName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ssn.ToString();
txtPatientKin.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Patient_Kin.ToString();
txtRelationWithPatient.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Kin_Relation.ToString();
txtPhoneNo.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Kin_Phone.ToString();
ddlPreferredPharmacy.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Id_Pharmacy.ToString();
txtEmergencyContactName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Emergency_Contact_Name.ToString();
txtEmergencyContactNumber.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Emergency_Contact_Phone.ToString();
txtRelation.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Kin_Relation.ToString();
txtRace.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Race.ToString();
ddlHowDidPatientFindUs.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).How_Found.ToString();
txtEmployerName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_Name.ToString();
txtEmployerOccupation.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_Occupation.ToString();
txtEmployerPhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_Cell_Phone.ToString();
txtEmployerAddress.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_Address.ToString();
txtEmployerCity.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_City.ToString();
ddlEmployerState.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_State.ToString();
txtEmployerZip.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Employer_Zip.ToString();
txtRecordsReleasedTo.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Records_Released_To.ToString();
txtOtherInfo.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Other_Info.ToString();
txtPopupNote.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Popup_e.ToString();
ddlPPlanName.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Insurance_Name.ToString();
txtPGroupNo.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Group_No.ToString();
txtPIDNo.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Id_No.ToString();
txtPPhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Plan_Phone.ToString();
txtPVerifiedWith.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Verified_With.ToString();
txtPVerifiedPhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Verified_Phone.ToString();
txtPEffectiveDate.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Effective_Date.ToString();
txtPExtDate.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Ext_Date.ToString();
if (db.usp_ATI_FetchPatientDetails(iPatientID).Count() > 0)
{
txtPGLastName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Grn_Name.ToString();
txtPGFirstName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Grn_Name.ToString();
txtPGMI.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Grn_MI.ToString();
txtPGBirthGDate.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Grn_Dob.ToString();
txtPGAddress.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Grn_Address.ToString();
txtPGCity.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Grn_City.ToString();
ddlPGState.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Grn_State.ToString();
txtPGZip.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Grn_Zip.ToString();
txtPGEmployerFirstName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_Fname.ToString();
txtPGEmployerLastName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_Lname.ToString();
txtPGEmployerPhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_Phone.ToString();
txtPGEmployerOccupation.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_Occupation.ToString();
txtPGEmployerAddress.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_Address.ToString();
txtPGEmployerCity.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_City.ToString();
ddlPGState.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_State.ToString();
txtPGEmployerZip.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Grn_Emp_Zip.ToString();
ddlPGPatientRelationshipToGuarantor.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Grn_Rel_With_Pat.ToString();
txtPGOtherInsuranceNotes.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Other_Notes.ToString();
txtPGAuthorization.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_Authorization.ToString();
txtPGAob.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(0).Ins_AOB.ToString();
}
if (db.usp_ATI_FetchPatientDetails(iPatientID).Count() > 1)
{
txtSGLastName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_Name.ToString();
txtSGFirstName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_Name.ToString();
txtSGMI.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_MI.ToString();
txtSGBirthGDate.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_Dob.ToString();
txtSGAddress.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_Address.ToString();
txtSGCity.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_City.ToString();
ddlSGState.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_State.ToString();
txtSGZip.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_Zip.ToString();
txtSGEmployerFirstName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_Fname.ToString();
txtSGEmployerLastName.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_Lname.ToString();
txtSGEmployerPhone.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_Phone.ToString();
txtSGEmployerOccupation.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_Occupation.ToString();
txtSGEmployerAddress.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_Address.ToString();
txtSGEmployerCity.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_City.ToString();
ddlSGState.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_State.ToString();
txtSGEmployerZip.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Grn_Emp_Zip.ToString();
ddlSGPatientRelationshipToGuarantor.SelectedItem.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Grn_Rel_With_Pat.ToString();
txtSGOtherInsuranceNotes.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Other_Notes.ToString();
txtSGAuthorization.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_Authorization.ToString();
txtSGAob.Text = db.usp_ATI_FetchPatientDetails(iPatientID).ElementAt(1).Ins_AOB.ToString();
}
My question is that, for each control the Stored Procedure called or not? If it is yes then it is time consuming and I need to use LINQ to DataSet or LINQ to Object rather than to call SP for each control. What is difference between LINQ to DataSet and LINQ to Object?
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Jan 26, 2010
I have the following code:
[Code]....
With this code behind:
[Code]....
Initially, I wrote the GetTeamMember() method to display the FullName in the ItemTemplate.
Then as I wrote the EditTemplate, I needed to populate a DropDownList with a list of names (first and last). It was fairly easy using the LinqDataSource, however it currently only shows the LastName. I could write another method GetTeamMembers() to populate the ddlTeamMember with the data I want, but I thought maybe there's a better "LINQ" way.
So I'm looking for a better way to get FullName (i.e. Firstname + " " + LastName) into both lblTeamMember and ddlTeamMember.
Options I thought of are:
I could write a method GetTeamMembers() I write a StoredProc that returns the extra column Better way?
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