DataSource Controls :: Make A LINQ Databound Record Update Page?
Mar 15, 2010
I am creating a database frontend in aspx/C# using LINQ to MSSQL. It has two pages: a main page which lists all of the records, and a page that appears when the user click the "Edit" button next to one of the list items for the user to edit a record.The database table has about 70 user-editable fields. I need to make the edit page, allowing the user to update/insert records. There are a couple ways I can think of make an edit page:Using a LinqDataSource and FormViewUsing a LinqDataSource and DetailsViewManually retrieve the value for each field and set the value for each field directly from Linq (e.g. "projectIDLabel.Text = Convert.ToString(thisRecord.Project_ID)"What would be the best way to design this?
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Nov 9, 2010
Here is the sqldatasource config code: <asp:SqlDataSource ID="SqlDataSource1" runat="server"
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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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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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Apr 3, 2010
I am in a serious trouble right now, i wanted to know that how to write a query in LINQ to SQL to retrieve identity column's current value before inserting any value.
I need this cos i m building a windows app n i need to display this value before inserting a record. I have tried DataContext.ExecuteCommand('DBCC CHECKIDENT (Tablename)') but it returns the number of rows modified.
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Jun 17, 2010
I am not sure if I am in the right spot here because this really doesn't have to do any datacontrol but hopefully somone can give me a hand with this.
Basically I have a bunch of TextBox controls on a page that are displaying the data I want but when I try to run an UPDATE query on the record I get nothing. The record values don't update and I don't appear to get any exceptions.....I am actually kinda really baffled on this one, here is what I have for the update code: [Code]....
Btw, if there is an easier way to do this with a control I am up for suggestions as I am just going off of some of my old VB6 ways
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Jan 4, 2010
If this is not the appropriate forum for this I didn't see any linq specific forum listed.
I am about to start a new project and I would like to use it as an opportunity to update myself with the newer technologies, like ajax and linq.
All my database CRUD operations will be done by sql stored procedures, does linq still make sense when doing that? I watched a couple introductory videos on linq and none of them dealt with stored procedures, thats why I'm wondering.
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Feb 9, 2010
Is there a way I can automatically update a 'Date' column in my database table to the current date whenever any cell in that record is updated?I've started looking into table triggers a little bit and I'm wondering whether I can do it using this?
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Jan 13, 2010
my requirement is to update a duplicate record in datatable.in my website if anyone select a product more than one time then i have to check and update the quantity of that record.i use for loop for this but it is not working properly, it is running perfectly for one product but when i add another product it won't work.how can i do this?Here is my code part which is run on add button click
if (sc.dtcart.Rows.Count > 0)
{
for(int i=0;i<sc.dtcart.Rows.Count;i++)
[code]...
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Apr 10, 2010
I have been able to successfully read a row of data from an SQL table using two column parameters. Now I would like to update this row with new information. Is this possible since the reader does not specify which row was read with the 'reader.Read();' command?
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Jul 2, 2010
[Code]....
After this and in the same procedure i want to update the inserted or the updated record which occared in the above code with the follwing update statment :
[Code]....
updating mark is completed successfully if the record is existed (Update Case) but if the record does not exist (new record) ... the update of the mark is not occured ..
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Apr 3, 2010
I am running the folowing simple test code:
[Code]....
But the UpdateUser field does not update - it remains at NULL. No errors occur. I can use similar code to update table fields in other dbmls successfully.
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Jun 22, 2010
I have a method to execute two "Update" sql statements.
The first one works fine and the second one I can't get to work for nothing.
Here is the entire method:
[Code]....
The error I am getting is "Incorrect syntax near '05'."
It is occuring on the next to the last line which is:
dc.ExecuteCommand(sql);
I update the variable "sql" first so I can debug. At the time it crashes the value of sql is:
"Update Blogs set Status = 'Archived', ArchiveDate = 06/22/2010 05:14:46 PM Where (BlogID != 1) and (Status = 'Published') and (AuthorID = 9e37e028-c205-4903-920e-e8643b30a724)"
It appears to be the ArchiveDate that is causing the problem here. The "05" is the hour of the time portion. Both ArcgiveDate and PublishDate are defined exactly the same in the database. If you look at the first dc.ExecuteCommand it does exactly the same
thing with PublishDate (DateTime column) in the same table and it works just fine.
Then I modifed the code and remove the ArchiveDate from the sql statement then I get the error:
"Incorrect syntax near 'e028'."
which as you can see is part of the AuthorIDs value in the where clause. So I am assuming both the date and the Guid / Author ID is causing problems. I have tried enclosing the values in quotes but I just cant make this work even though it seems to be working fine in other places.
I even remove the code for the author ID and left in the code for the ArchiveDate and it still does not work so I have proved that both are causing a problem.
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Apr 23, 2010
I have a table with Id, Name,...IsActive, etc. If user wants to delete a record from the user, he/she should update the field IsActive to false. I am able to acheive this functionality using the below steps,
1. Query the database for the row which is to be updated.
2. Update the property IsActive to false.
3. Submit the changes to the database.
This way i am successful. But i have a query here is that, when we execute steps 1 and 3, there will be two trips to the database for getting the required object and again updating the same object to the database.
Is this not a performance hit having multiple calls to DB for a simple operation.?
Do we have any other go, where in within a single call to database, can i update a field of row?
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Mar 30, 2010
I'm studing Linq on TheBeerHouse Project,I would create a my Linq Version.I have a big problem with Updating, this i a part of source :
protected static ArticlesDataContext GetContext()
{
return new ArticlesDataContext(Settings.ConnectionString);
[code]...
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May 25, 2010
I am using Linq to SQL. Tables have timestamp columns and I am using regular Linq methodology in ASP.NET MVC.I do use detached entities and always try to do updates without first querying the database for the original entity. To update an entity I use context.Attach(entity, true) followed by context.SubmitChanges() and all is fine. The sql statement that gets executed looks like:
[Code]...
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Jun 9, 2010
I like to use my own stored procs as much as possible.
That way I know exactly what's happening and I can explain and control things.
I'm using stored procs with LINQ to SQL for CRUD operations.
For select, insert and delete - using stored procs with LINQ to SQL is pretty straightforward.
However, if I want to use my own custom stored procs with L2S for updates what's the best way to accomplish this?
Can you provide some code that shows the best approach that you would personally choose for this?
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Jan 6, 2010
I have a form that gets populated by LINQ and I want to be able to update the database using that same form. The form is populated by grabbing a querystring (for example, "edit=10") and searching the primary key for that record. So far so good. I have a button attached to the function below which is supposed to use LINQ to update the database with data from the form. I get no errors, but for some reason, it is only updating one field (Last_Updated) instead of all of them.
[Code]....
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Apr 8, 2010
i want to update many rows with difference values inside table. i'm coding a timetable.
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May 11, 2010
when i want insert a record i see an error like this Can't perform Create, Update, or Delete operations on 'Table(MainMenuLink)' because it has no primary key. with this codes:
MyLinqDataClassesDataContext db = new MyLinqDataClassesDataContext();
MainMenuLink li = new MainMenuLink { Link = "www.tprogrammer.com", LinkSubject = "subject" };
db.MainMenuLinks.InsertOnSubmit(li); [code]....
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Jul 11, 2010
I am trying to update my table ARTICLES and it has a field COUNTER, Everytime a user enter this ARTICLES, the page_load event runs a LINQ to SQL query taking the QueryString as parameter, increasing the COUNTER field in 1.
[Code]....
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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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Jan 5, 2010
I have a "simple" method that takes a Linq entity containing the information I want to update. The method then creates a list of counties the information is to be updated for, and tries to update the information for each county.
So user goes in fills form out selects update All counties, and the information in the form should be updated for all the counties for the member. Here is the code.
[Code]....
The first pass through the foreach runs perfectly, the second time through I get an error: Cannot attach an entity that already exists.
What is best way to work around this?
I have though about putting the foreach loop in my business_logic layer, and have it pass both the newRecord and OldRecord, but figured I would ask, before making the code change.
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Feb 4, 2010
I have a Label Control for displaying the Message on submitting the record , iam using the Master Page , Update Panel .
Now on submitting the record successfuly i want to set Focus to Label COntrol as User Know that the Record has been submitted.
How i set the Focus back to Label Control with Update Panel?
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Mar 22, 2010
I'm working on a website to showcase some of my bird photography, using ASP.NET 2.0 and C# with a SQLServerExpress backend.What I have right now is a ListBox bound to my database that displays a list of common names of birds and when the user clicks on an item in the listbox the main image on the page is changed to the image for that bird. For style reasons I want the listbox to always be a fixed size and because I specify the size (using CSS) a vertical scrollbar appears. My problem is that I want to provide my own images of arrows that go above and below the box such that when the user hovers over an arrow the box scrolls slowly and when the user clicks an arow the box scrolls quickly. Finally, my main problem is that I want to get rid of the ugly default vertical scrollbar that comes with ListBox.
Can you guys help me figure out how to do this? I don't mind using a different control other than ListBox as long as it is available in ASP.NET 2.0 and as long as it can be bound to my db. I also don't mind using JavaScript (which I'm sure I'll end up doing for the hover effects). Right now I'm fooling around with subclassing the ListBox control but I've never subclassed a control before so I'm somewhat clueless.
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