ADO.NET :: Handling Default Notnull Column In Linq To Sql?
Sep 16, 2010
I have a column called regdate datetime default getdate() , the column is notnull.I am using linq to sql.I have created instance of that table and when i try to insert record into the table, I am getting daterange exception.(range should be 1/1/1753 to 31/12/9999).In that object I am not setting any value to regdate property as that would be taken care by sql server.If i set regdate = datetime.now.date then record is inserted successfully.I dont want to set any value from front-ent.I want sql server to do that for me like we do it using stored procedure.
I have a dropdownlist that is being populated using linq. The code for linq is below
[Code]....
When the page is viewed the dropdownlist show the following;towels, shoes, etc. What I would like is the default item to be nothing. That is when the page is viewed then the drop down list should show something like this "select category". Right now it is starting by showing towels, which is quite irritating, since if I want to see towels I first have to select something else and then go back and select it!
I have a Dynamic Data Website that I created after watching the video tutorials on this website (I'm new to programming, but not computers).I have a SQL Table named 'Adult' that has a 'DOB' column. I would like to add an asp:label to the Default.aspx that does a LINQ to SQL query to determine if it's someones birthday today and if so display their name and age.
I have 5 bound columns to be retrieved from the database but I want that on page load event the retrieval of data should be sorted according to that column only
From my ASP.NET application I am calling an INSERT stored procedure, there is a default value for one of the columns in the table that the INSERT procedure places the data into. How do I specify that I want the default value to be used instead? (Or do I have to specify the actual default value in my parameters)
In my application i want to compare data of two users from database table using linq.
lets say i have ten columns in UserMaster table.
Now based on the comparision i want to display result.
Like is 10 out of 10 columns matches for those two users result will be 100,if 9 columns matches then result will be 90 and if 0 matches thn result will be 0.
I would like to select some data from multiple tables and calculate a new column IN the query.In SQL it would look like: (select A, B, ((C * D) + (C * E)) as 'calc' from tab1 join tab2 on.join tab3 on.join tab4 on ...);I've tried this in linq, but it didn't work as I believe.
SELECT IDNum, Max(Convert(varchar(20), (TimeOut - TimeIn), 108)) FROM IO_Times Group by IDNum order by Max(Convert(varchar(20), (TimeOut - TimeIn), 108)) desc";
Into LINQ in C#. The above returns a list of the maximum value of (TimeOut-TimeIn) that corresponds to each unique IDNum (There are multiple TimeOut-TimeIn values for every IDNum).Here is what I am trying now:
from IO_Time in db.IO_Times orderby SqlMethods.DateDiffMinute(IO_Time.TimeIn, IO_Time.TimeOut) descending group IO_Time by IO_Time.IDNum into list select new { ID = list.Key, Time = list });
This returns the correct IDs in the correct order, but the "list" contains everything in the database entry (which makes sense). I have also tried group by IDNum and Time, but then I get unique time entries and multiple IDs returned.I could do a foreach loop and manually sort it all out, but I would really rather not do that.
I am using Linq to read data from the database, the database has 5 coloumns.Here is the code that I am using to read from the database.
[Code]....
Now, I call this method as : var retrieved_Data = objDataMgrClass.ReadData();Now comes the problem that I am facing how to read each coloumn from this var retrived_Data??? I have tried using foreach loop but i keep getting an error : foreach statement cannot operate on variables of type 'object' because 'object' does not contain a public definition for 'GetEnumerator'.The foreach loop i have used as:
All I am trying to do is query the database, then get the returned values, so that I can do some calculations. But, I don't understand how to get the values from the database row that is returned, so that I can assign it for usage.
I would like to do something where the logic goes: for the index of [1] (which is just column 1), multiply it by 2. For the index of [2] (which is just column 2), multiply it by 3.
I added a DateTime column to a table in my database through the Server Explorer. Because the team lead for this project wasn't savvy on nullable types, one of the requirements was that there be no null values in the database. This requires me to program all sorts of useless code into the system, but that's another story. My problem arises when assigning a default value to this column. I typed the following into the cell for the "Default Value or Binding":
1/1/1753 12:00:00 AM
When I went to inspect the content of the table, I found that all of the dates had been populated with:
I have a gridview which I use to add items through the footer and the EmptyDataTemplate. There is a date field. I want to set the default of it to the current system date.
I'm using Linq to Sql to call some stored procedures for more complex work; is there any way Linq to Sql can tell me when the output columns from the stored procedure do not match the properties of my entity object? It seems that Linq to Sql tries its best to match the columns and ignores any mismatches.
I have a Timestamp column in my Table. I want to read the date time value and display in UI.
In Linq the Timestamp column is represented as System.Data.Linq.Binary.
I dont know how to retirve date time value in "MM-dd-YYYY" format from this Linq.Binary
- Why I am using Timestamp?.
I want to perform some operations based on the last modified date time of the particular row. Since I am using TimeStamp column in my Table as version column, It will contain the last modified date details, So i want to read the date time value from this time stamp column to do some other operations.
I have a complicated join between a few tables but I have managed to replicate the error using linqpad and the small tables below. There are references between the COLNAME column and the YAXIS column and also between COLNAME and XAXIS that is not explicitly defined.
The error is "Specified cast is not valid", which originally I wasted time thinking the problem was converting the data returned to my object in VS 2010, but the error also happens in linqpad with no defined object. It seems insane that a bit column would cause this problem. If I change the column type to a VARCHAR it works fine. If I run the generated SQL from linqpad or sql profiler that also returns fine.
