ADO.NET :: Updating Record With Linq To Sql?
Dec 29, 2010
i want update record of Photo table with linq to sql so i create a sproc for it
i dispaly records of Photo table into the Gridview untill when user click on the update command
can updating selected row in a set of textbox
how can i fetch Fields value of selected row for put in the textboxs and updating them?
how can i bind DDLCategory(dropdownlist) to CategoryDatasource(LINQdatasource) with coding?
i want when i select cotegory from DDLCategory ,gridview has been changed?
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Mar 16, 2011
Customer customer = (from c in db.Customers
where c.CustomerID == "ABCD"
select c).Single();
customer.Country = "Canada";
db.SubmitChanges();
How to Print the SQL statement being sent to database server by the above Linq Query?
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Mar 20, 2010
I retrieve a record on my database through Page_Load event here's the content of my Code:
hMenuID.Value = Request.QueryString["id"];
//Display information of links on the entries
cnDBConnection.ConnectionString = clsFunction.strConnection;
cnDBConnection.Open();
cmModule.Connection = cnDBConnection;
cmModule.CommandText = "SELECT * FROM modules WHERE id=" + clsFunction.ReplaceString(hMenuID.Value.ToString());
rdModule = cmModule.ExecuteReader();
if (rdModule.HasRows == true)
{
rdModule.Read();
txtModuleLabel.Text = rdModule["name"].ToString();
txtModuleLink.Text = rdModule["link"].ToString();
cboParentID.SelectedValue = rdModule["menuid"].ToString();
}
cmModule.Connection.Close();
rdModule.Close();
cnDBConnection.Close();
So, the data appears on my textboxes and a combo box. I tried to modify the content of my textbox and click on the Update button. Unfortunately, there's no modification that happen. Here's my code in the Update button
Code:
if (Page.IsPostBack)
{
if (Page.IsValid)
{
cnDBConnection.ConnectionString = clsFunction.strConnection;
cnDBConnection.Open();
cmModule.Connection = cnDBConnection;
cmModule.CommandText = "UPDATE modules SET name='" + clsFunction.ReplaceString(txtModuleLabel.Text.Trim()) + "', link='" +
clsFunction.ReplaceString(txtModuleLink.Text.Trim()) + "', menuid=" + cboParentID.SelectedValue +
" WHERE id=" + hMenuID.Value;
cmModule.ExecuteNonQuery();
cmModule.Connection.Close();
cnDBConnection.Close();
}
}
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Jan 25, 2011
Is there any benefit (performance wise) to check if a record exists before updating it or do I just go straight in with an UPDATE WHERE?
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Jun 6, 2010
I am trying to update gridview record, i am not getting any error but its not updating the record either.
[Code]....
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Sep 14, 2010
easiest way to create/update a parent and child record at the same time (like customer with multiple addresses) with least or no code as possible? Both Web Forms and in MVC.
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Jan 20, 2010
I have GridView where I am binding payment_terms for an invoice. The Gridview Looks somethign like this.
Head Payment_Date
Advance payment 10/01/2010
25% after completion of the project 20/10/2010
So a command button i want to set the status of these heads from 'N' to 'Y'. The code that i am writing is appended below...
[Code]....
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Mar 12, 2010
I have an ASP.NET Page that updates registered User Address Details for a selected record.
Below is the Update method that i am calling from Controller.
When i am calling ApplyPropertyChanges method, I am getting the below error.
Did anyone run into the same error while updating the record with Entity Framework.
[code]...
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Apr 12, 2010
I had another post about this issue, but decided to modify it to drill down and find the issue. I was doing a master/details, and that was not working, so I have changed it to just a single data source with a single details view created entirely via wizards. The issue is, when I click on the auto generated edit link, and change values in the fields, after clicking update the page refreshes without error but does not update the record. Here is the code:
[Code]....
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Jan 28, 2011
I am just starting to use linq to sql for data access. It is working fine for read only. But it does not work for update. I have been reading the threads over several forums. It is clear that anonymous types (in my case var) cannot be updated. I cannot find what I should replace the var with and where I find it.
Below is the code. The exception is
Error 1 Property or indexer 'AnonymousType#1.date_last_logon' cannot be assigned to -- it is read only
fmcsaDataContext db = new fmcsaDataContext();
// DataTable _UserTable;
UserModel _UserModel = new UserModel();
var users = from u in db.FMCSA_USERs
where u.USER_NAME == pName && u.ACTIVE == true
select new
{
date_last_logon = u.DATE_LAST_LOGON,
date_current_logon = u.DATE_CURRENT_LOGON,
failed_login = u.FAILED_LOGIN,
};
if (users.Count() == 0)
return null;
foreach (var user in users)
{
user.date_last_logon = user.date_current_logon;
}
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May 11, 2010
I've been googling for 2 days for the solution, but I couldn't find something useful. The problem is that I have GridView that is connected to the SQL database and that is how it is being populated. I added EDIT and DELETE buttons in the columns, but as far as I can see the event which handles them is empty.
[Code]....
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Apr 17, 2010
I've got a gridview with three fields, the last of which is a template field with an imagebutton in.
The first field is a Date, and the second is a time field (it is however just varchar field as it may differ and will not be programmatically used).
I want the following to happen if I click on the imagebutton (reserve):
Four other fields must be inserted into the record.
Is the best way to launch a detailsview where the row.imagebutton@=ID and just edit the fields like that or should I pass the two fields (and RecordID) along with the query string to a new page where the passed information can be in invisble textbowes and just have the user enter (UPDATE) the four outstanding fields? I feel like doing it this way?
can read on 1. setting up the onrowcommand code for the templatefield 2.
This should be simple as it is only one table with records that has to be partially inserted by an admin person (2 Fields) and then completed by a web user (4 fields).
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Apr 10, 2010
I'm new to asp.net 3.5 and I have been working through the tutorials using a real access database to learn how to use the new controls. I have an extremely simplistic page setup with a master-details view, the master using the gridview, and the detail using the detailsview controls. Everything seemingly functions correctly, except when I try to update the data in the details view. I make changes to the record, click update and the page posts back but nothing is updated in the database. No errors are given either.
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Feb 27, 2011
I have a question about linq delete.
I have 2 table in database and they are joined.
First Table: UserID, UserName, UserSurname, UserPhone, CompanyId
Second Table: CompanyId, CompanyName
First Table I have many recods with related second table.
I want to delete one company in second record, But firtly I have to delete users (more than 1)
How can I delete it with using linq?
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Aug 30, 2010
My project includes a grid view with some updtable fields, some fields throw an error on update and some do not and it does not really make sense. WORK_STATION_ID does not cause an error, ROOM _ID cause an error, both are int? (I am using c#) and for update I use the code liste below.
[Code]....
[Code]....
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Mar 24, 2011
I have a GridView which needs to get updated on RowUpdating Event. How can I update data using LINQ?
I am populating GV using LINQ too and here is the code for that:
protected void Page_Load(object sender, EventArgs e)
{
string getEntity = Request.QueryString["EntityID"];
int getIntEntity = Int16.Parse(getEntity);
using (OISLinq2SqlVs1DataContext dt = new OISLinq2SqlVs1DataContext())
[Code]....
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Jan 29, 2010
My insert is adding a record to the database in the call to the stored procedure in SQL Server, but a -1 is returned - Shouldn't it return 0 if the insert/update was successful?
Result = myCommand.ExecuteNonQuery();
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Sep 15, 2010
I'm trying to set the ImageUrl property after I've uploaded an image so that I can display the newly uploaded image, but for some reason it's not working.
If I navigate from the record I've just updated and then return back to that same record, the image then displays. It just doesn't display right after I've updated it. Basically what I'm doing is this:
Sub FormView1_OnItemUpdated(Sender As Object, e As FormViewUpdatedEventArgs)
Dim MyImage As Image
MyImage = FormView1.FindControl("Image1")
MyImage.ImageUrl = "image1.jpg"[code]....
I've left out the path intentionally because I'm pretty certain that the path I'm giving is correct... again, if I navigate away from the record and then return to it, the image displays. In addition, when I view the "Page Source" to view the resulting html, the src property of the image tag is blank . So, it's not a path issue... the issue is that its not setting the src at all which is why the image is not displaying.
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Sep 7, 2010
I'm inserting data into a database with Linq to SQL and would like to access the primary key of that record WITHOUT doing a query for the values I've already captured.
Here is my insert startment:
[Code]....
There is a value in the table that is an auto increment integer.
Rather than doing a query for the pagetitle, description and content I'd like to just access the primary key that I would have just generated by performing the insert.
Is this possible or would I have to perform the query as I've just mentioned to retrieve it?
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Jan 28, 2010
I have the following xml:
[Code]....
If I have an ID, I would like to retrieve the next item that also has the same category as the item ID I have. So, for example, if I have ID=2, I would like to return the item with ID=4 (as item ID=3 has a different category).
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Dec 31, 2010
I try to access to the fields of each single record in the table without writing the specific name of the field,
For example , checking each property of the record whether it's null or not,
something like that:
var myUser = from u in dataContext.Users
select u;
foreach (User item in myUser)
{
// Here I wand to access to the fields by their ordinal number.
}
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Aug 24, 2010
I would assume this is possiable but I cannot seem to find it anywhere. I just one the contents of a single field, I don't see why I have to return the how
record to get get that information, here is my current code, how can I make this better without returning the entire record, for just getting contents of one field.
var patternrecord = storedb.Patterns_Table.Single(a => a.Pattern_GUID == id);
PMEDIA.Pattern_Key = patternrecord.Pattern_Key;
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Feb 8, 2011
how to insert record in sql server database by using linq?
still i m using MVC 3.0 send me full detail example for insert record using Linq
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Apr 23, 2010
how to pull a RANDOM item from the database when using LINQ. There seems to be a couple of differnet ways to handle this. What I need to do though is pull a RANDOM item from the database that the user has not seen before.
The data I am pulling from the database is very small. Is there any way I can just hit the database once for 1000 records and then randomly scroll through those?
Should I put a cookie on the users system recording the IDs of which items they have seen, pull a random record, check to see if it is seen and if so, pull from the database again? That seems like performance issues just waiting to happen.
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May 25, 2010
I use the following code to insert recode to a sql 2008 table, the field ID of DBProgram is IDENTITY, so SQL 2008 SERVER will pass a value to it automatically. How can I get the ID value of the record I just insert ?
DBProgram dbProgram = new DBProgram();
db.DBPrograms.InsertOnSubmit(dbProgram);
db.SubmitChanges();
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