I know there is a way to get all the column name from a table, but that is not what I want
I want to get only a few column name from the table, is there a way to do this?
Let say, table A has three columns that is A1, A2 and A3, I only want A1 and A2 column names, again, can this be done?
BY the way, I am using SQL Server 2005 with asp.net application.
I'm currectly tryin to access a specific value in my database in a specific column. I'm tryin to use the primary key of the table to access the actual value in the row of that ID.
The current code:
[Code]....
Just iterates through the table and looking for any row with the boolean 'checkin' value is True, then it takes the 'id' value of that row and stores it into an array. Is there a way that I can access a another entry, and only that entry, in the table with the 'id' stored in the array?
Like if my data base contained and int, primarykey, `id` value, a boolean, `checkedin` value, and a `time` value, is there a way to access, lets say, the row with `id` equalling 3 and and the checkIn value from that row?
However has anyone ever seen a situation where, when you try to access the value of a column in a DataRow, you get the error "Column... does not belong to table.." when, in fact, it does?
The column name in question is called "ByWeight". I am wondering if either that, or maybe one of my other column names, is a reserved keyword and that's causing/masking this error.
If I look in the locals window and expand the DataRow, one of my columns is DBNull - by that I don't mean that the column value is DBNull, I mean the actual column itself is DBNull so it doesn't expand. I think there's a clue there.
I have a table with several columns i created,
How can i add a new column and specify its data type now? i using sql server and Gridview.
I tried to add one using GridView but it shows me columns called edit delete something is not like my bound fields i created early.
I am able to store the current time of day in a column defined as time with the C# code as:notestable.NoteTime = DateTime.Now.TimeOfDay;The hour, minutes, seconds, and even millionth of a second is stored. But now, I need to retrieve the time and convert it into a string. I tried to use DateTime statements to accomplish this as with:
DateTime nt = notestable.NoteTime;
String FirstT = nt.Hour.ToString() + ":" + nt.Minute.ToString().PadLeft(2, '0');
Regarding the 'nt' variable, I got an error message that said: Cannot implicitly convert type 'System.TimeSpan?' to 'System.DateTime'.Regarding the 'Hour' designation, I changed the definition of 'nt' to 'var' and got an error message that said: System.Nullible<System.TimeSpan>' does not contain a definition for 'Hour' and no extension method could be found.So, how do I access the time from a table and convert it into a string for display in a TextBox?
i want to pass null value into varbinary(max) column n to by table
if i do like this i have this function in my app_code .vb class
Public Function Remove_Attachment(ByVal Id As Integer) As Integer
Try
Dim db As New dbAccess
db.commandText = "SP_RemoveAtt_DML"
db.commandType = CommandType.StoredProcedure
db.addParameter("@InOutVal_Id", Id)
db.addParameter("@Document", System.Data.SqlTypes.SqlBinary.Null.Value)
db.executeQuery()
Catch ex As Exception
Throw ex
End Try
End Function
i got this error. Data is Null. This method or property cannot be called on Null values.
I have defined some binary bit columns in an SQL database table to indicate yes/no conditions, but I don't know how to set or reset them. I tried to use "profile.Volunteer = 0;" C# code in an event handler to reset a voluntary state for the Profile table of members, but what I got back was an error message that said, "Constant value '0' cannot be converted to a bool'. So, if a '0' cannot be used to reset a boolean value, what can be used?
View 2 RepliesI am trying to do a lookup in a table with a value stored in an xml column.
I tried this several ways but I can't get it to work.
Here is some code:
[Code]....
I attempted to change a table columns data type and in the process caused a lot of issues. I had a date column in one of my tables and stupidly changed it from varchar to date. When I tried to run queries on it I keep getting the 'cant find column 3 error'. Now that tables structure is :
[Code]...
So column 4 is actually the date column. All other queries work for this table. I then tried to change it back and then copied all data to a new table and now I am using the new table and converting the dates as needed but I am still getting the error.
SELECT * FROM postlinks WHERE postlinks.date >= CONVERT(datetime,CONVERT(varchar(10),GetDate(),112))
I want to Update Column of a Table where ColumnName will be DropDown.SelectedValue. Example: A set of RECORDS will be displayed from a Customer Table where CUstNo ='1234' and City= 'Chicago' and Grade ='B' Once displayed I want to Update the grade to 'A' of all those customers from the above criteria. In My case I have like 100 Columns, so in where Clause Column Names will be selected from a DropDown. In My Query, Update Customer SET ColumnName= 'some value' where ColumnName ='ActualValue' So how can I pass the ColumnName which is Dropdown Selected Value. I believe I can't give as Update Customer SET DropDown.SelectedValue = 'some value' where DropDown.SelectedValue ='ActualValue' how can I resolve this ?...
View 9 RepliesMmy data table has four columns. How can I get only selected columns name?
View 5 Repliesi am trying to find the column length of a particular sql table, it is working very fine if its 'nvarchar' or 'text' type. But if i try to get the numeric(int/bigint/bit) data type i am getting error. please help me out. The sample code is given below for you reference,'*** Source Code Start
Dim da
As
New OleDbDataAdapter(strQuery, PortalConn)
[code]...
I have an SQL table which looks similar to the following:
Title | Author | Tags
'title1' 'author1' 'horror, steven king, clowns'
'title2' 'author2' 'childrens, roald dahl, chocolate'
Let's say I wanted to find the name of a book that has the tag 'clowns' in it...how can I do this? 'clowns' is a substring of the tag for 'title1'...but how do I search for substrings? I have tried to use the "LIKE" keyword but obviously it doesn't work in this situation.
I am trying to populate table column names into a dropdown list . how can I query using Linq to SQL to just get the list of few Column names ? in a method in DAL which I can use to load in my UI page !!
View 2 RepliesI have tried to query a table with an xml column by using XQuery and I can't get the Select to work.
All my knowledge/understanding of the subject comes from this MSDN article:
[URL]
so I am probably overlooking something minor:
I tried this query Select col1, Phone.Query('element CellPhone {I am not sure about what goes here} I tried {data('Phone/cellPhone} from aTable Where Phone.Exist('/Phone/cellPhone/text()[contains.,"412-8977"]') = 1 This syntax is definitely not fun.
I want to copy data from a table[tblExcel][No.of columns:2] to another table[ev_event] which has 5 columns, 2 columns from the another table, 3 columns from user defined value
[code].....
How to handle this error
"An explicit value for the identity column in table 'UserActivation' can only be specified when a column list is used and IDENTITY_INSERT is ON."
I am working on a web app for an online photo album. It is the last project in Scott Mitchell's book: "ASP.Net 2.0 in 24 hours".
I am creating a page where users can enter new photo images. The functionality for uploading an image will come later. I am working on just inserting a new row into the Pictures table with an optional category, a required title and a required description.
I am getting an error when I try to insert a new row.
Here is a screenshot of the page with a shot of the dropdown list.
The Categories are user-specific. I am getting the correct values retrieved.
[URL]
There are two pretty simple database tables involved here.
NOTE: The CategoryID and PIctureID are both autoincrement integer columns.
[URL]
The page uses a DetailsView that uses a SqlDataSource that uses the Pictures table. (The DetailsView's Default Mode property is set to "Insert". The "Enable Inserting" checkbox is also checked.)
The dropdown list uses a dropdown control that uses a SqlDataSource that uses the Categories table.
When the "Insert" button is clicked the CategoryID value associated with selected (Category) Name on the dropdown list will be used along with the Title and Description values to insert a row in to the Pictures table. (If no Category value is selected, then a null value will be used for the CategoryID. This is OK because the CategoryID column in the Pictures table allows nulls.)
My problem is that I am getting this error:
Cannot insert explicit value for identity column in table 'Pictures' when IDENTITY_INSERT is set to OFF.
(FYI: I have the full version of both Visual Studio and SQL Server.)
Here is my source code for the page:
[Code]....
I am quite new to LINQ, and I am stuck with this probably basic problem, but haven't been able to find a solution, so I thought I could ask here.
So, I have this repository where I put my functions for data accessing, and now I need to write a function to get all the applicants that have applied for this particular advertisement, and their values too. Now, the values are stored in a separate M:N table, where every row consists of the applicantID,advertisementID and value. I just wanna append the value to every applicant that I show, so that it would look like a Ranking List.
However, I do not seem to know how to select just the name column from the Applicant table, and just the Value column from the ApplicantValue table.
And there's this Iqueryable interface that further confuses me...
Here's my function to get the Applicants only:
[Code]....
Now, if I try to add to the definition of the type two columns, it says that it only messes with types, i.e. one type should be passed. So I figured I would do a ViewModel and then pass it, like this
[Code]....
and then in the function I have no idea how to pass the values:
I'm trying to retreive a column value from gridview5 to use it in a query to display resuls in gridview, Also how do you hide a column in the grid?
Where (p.Link_ID Like GridView5.?
[code]....
i have a datatable with several columns and rows. now i want to copy the last column fully (all rows) and create the new column with that values.
it means last column values sholud be moved to new column (now this is the last column).
how can i select a record from A table and insert into B table using linq?
View 2 RepliesBasically i deal with two tables.i have a table T1 of the following format:id company_name i need to read this data and create a table T2 as followsi wrote the following code. it worked fine for retrieving data and modification but fails to insert the modified data into the 2nd table.the error is, it does not recognise the value for @token
ArrayList dynarr=new ArrayList(); // global variable
protected void Button2_Click(object sender, EventArgs e)
{
int row = 1; int i;
string strcmd = null;
string Connection = "Data Source=....";
SqlConnection conn = new SqlConnection(Connection);
string str = "select company_name from T1 where ID=@ID";
[code]...
I have two tables - Student and Advert.
I want to do the following;
1. Student is logged into their account (session is authenticated)
2. StudentID is primary key for that table, it is a foreign key for table Advert
3. When student is logged in, they create advert
What I want is their student Id to be input into the advert table when this new advert is created. How is this possible?
I'm assuming I need to use a pivot table from what I've found so far. However, every one that I've seen has not had the date setup like I have.
I have a Gridview on my page which I need to be populated like so
Date NCMR
1/1/10-1/31/10 #
2/1/10-2/28/10 #
I want to do this for 10 months... bottom record being the current month (or last month). I would also like the Date to format to January 2010 I used the above date format because that is how it is in the table. Basically, I need to know how to create the pivot table to search the table for 1/*/10, 2/*/10, etc