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Hello,
VS 2005
I have a datagridview that is bound to a bindingsource.
I am trying to merge this into another data table that has the same schema.
I have filled the dgv with the following code:
The reason i have used a dataview (dv) is so that when the customer selects from the combo box in the dgv, it doesn't automatically filter the rows.
'Fill the pending orders that belong to the order ID<br />
Private Sub FillPendingOrders()<br />
Try<br />
Me.TA_OrderDetails_dsCodeRed1.Fill(Me.DsAddComponetAndEquipment.OrderDetails)<br />
<br />
dv = New DataView(Me.DsAddComponetAndEquipment.OrderDetails)<br />
dv.RowFilter = String.Format("Status = '{0}' AND OrderID = '{1}'", "Ordered", CInt(Me.cboPendingOrders.SelectedValue))<br />
Me.dgvPendingOrders.AutoGenerateColumns = False<br />
Me.bsOrderDetailsPending.DataSource = dv.ToTable()<br />
Me.dgvPendingOrders.DataSource = Me.bsOrderDetailsPending<br />
Catch ex As Exception<br />
MsgBox(ex.Message)<br />
End Try<br />
End Sub
However, when i update the datagridview by entering some number into the cells, and click the save button. I have checked the database to see if the value has not been updated, and it hasn't.
This is how i am updating:
Me.bsOrderDetailsPending.EndEdit()<br />
Me.DsAddComponetAndEquipment.OrderDetails.Merge(DirectCast(Me.bsOrderDetailsPending.DataSource, DataTable), false)<br />
'Just to check to see if the value is displayed in the source column. This displayed what I value i put into the source cell ok.<br />
source = DirectCast(Me.bsOrderDetailsPending.Current, DataRowView)("Source").ToString()<br />
<br />
Me.TA_OrderDetails_dsCodeRed1.Update(Me.DsAddComponetAndEquipment.OrderDetails)
Many thanks for suggestions,
Steve
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Hi, I got the following from a tutorial on using store procedure for custom paging and I'd like to have few questions answered.
CREATE PROCEDURE uspPaging
@nStartValue INT,
@nEndValue INT
AS
SET NOCOUNT ON
DECLARE @tblTempData TABLE
(
nID INT IDENTITY,
EmployeeID INT,
LastName VARCHAR(50),
FirstName VARCHAR(50),
SupervisorID NCHAR(5)
)
INSERT INTO @tblTempData
(
EmployeeID,
LastName,
FirstName,
SupervisorID
)
SELECT
EmployeeID,
LastName,
FirstName,
ReportsTo
FROM Employees
ORDER BY
EmployeeID,
FirstName
SELECT EmployeeID,
LastName,
FirstName,
SupervisorID
FROM @tblTempData
WHERE nID BETWEEN @nStartValue AND @nEndValue
ORDER BY
nID ASC
What I don't understand is how does the computer know what the values of @StartValue and @EndValue are if they are not initialized. In this tuturial and another one I was reading, the @ symbols are used in naming the variables. Is it a must to use the @ symbol as the prefix of the variable name? Also does Between mean that if StartValue = 1 and EndValue = 5, then only EmplpoyeeID = 2 through 4 will be returned? Thank you in advance for your help.
-- modified at 23:57 Wednesday 1st August, 2007
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ASPnoob wrote: how does the computer know what the values of @StartValue and @EndValue are
They are the variables that store the parameters that you pass to your stored procedure when you call it. You need to pass the values to the stored procedure.
ASPnoob wrote: does Between mean that if StartValue = 1 and EndValue = 5, then only EmplpoyeeID = 2 through 4 will be returned?
No, all values from 1 to 5 inclusive will be returned.
-------------------------------------------
Don't walk in front of me, I may not follow;
Don't walk behind me, I may not lead;
Just bugger off and leave me alone!!
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Hi, thank you so much for your response, but I have one more question that I really need answered. Is 2 the number of result per page that will be displayed, if not how do I make it display the desired number of results per page? Thanks again for sharing your knowledge.
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The number of results it will return is dependent on the difference between the start and end values you pass it.
eg: if you pass the stored procedure a start value of 10 and an end value of 25, it will return 16 records (end value - start value + 1)
Are you understanding why the stored procedure is doing what it's doing?
-------------------------------------------
Don't walk in front of me, I may not follow;
Don't walk behind me, I may not lead;
Just bugger off and leave me alone!!
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Hi, please correct me if I'm wrong. I think that @nStartValue and @nEndValues are used as reference points. You Display the file in the temporary table starting with the one whose ID is equal to @nStartValue and stop at the one whose ID is equal to @nEndValue. So if 50 is @nStartValue and @nEndValue is 60, and the total number of files retrieved is 100. Only 10 files will be displayed starting with the one whose ID is 50 and ending with the one whose ID is 60. The rest will be discarded, and if that is the case then it will not solve my problem. Does that mean that if I want to display every file that is retrieved, I would have to know ahead of time how many files will be retrieved by my query? Thank you for your time.
-- modified at 3:19 Thursday 2nd August, 2007
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Yes, your description is fairly accurate. The point of the stored procedure it would seem is to set up a paging system, so that the N records between X and Y are returned. eg: the first page of records might return 1-10, the second page 11-20 etc.
That's pretty much would it would be useful for. What are you trying to achieve?
-------------------------------------------
Don't walk in front of me, I may not follow;
Don't walk behind me, I may not lead;
Just bugger off and leave me alone!!
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cn.ConnectionString = ConfigurationSettings.AppSettings("ConnectionString")
this code for Access how i can transfer it to SQL????????
hi
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1 - write sensible subjects for your posts
2 - this is a ASP.NET/VB.NET question, it doesn't actually relate to SQL.
3 - SQL Server and SQL are two different things. I assume you want to transfer to SQL Server ?
3 - just change your connection string to one that connects to SQL Server, in your web.config file.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Set the connection string to a SQL connection string in your app.config. http://www.connectionstrings.com[^] is a great site for reference if you haven't already found it 
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
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Hi, how do I convert select statement and the connection variable in the following line into a stored procedure.
Dim AD as New OdbcDAtaAdapter("SELECT ResumeID, Resumes From Professions", myConnection)
Thank you in advance for your help.
-- modified at 17:35 Wednesday 1st August, 2007
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CREATE PROCEDURE procname ( parameters ) AS batch of statements
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See the below C# snippet that's itterating over a SqlDataReader:
while (reader.Read())
{
c.ID = reader.GetInt32(0);
c.Category.ID = reader.GetInt32(1);
c.Subject = reader.GetString(2).Trim();
c.Body = reader.GetString(3).Trim();
c.SourceVideoClip = reader.GetString(4).Trim();
c.StillImage = reader.GetString(5).Trim();
c.Notes = reader.GetString(6).Trim();
c.UploadTime = reader.GetDateTime(7);
c.AdID = reader.GetInt32(8);
c.ValidAfter = reader.GetDateTime(9);
c.InvalidAfter = reader.GetDateTime(10);
c.BillingCode = reader.GetInt32(11);
c.Name= reader.GetString(12).Trim();
c.Birth = reader.GetDateTime(13);
c.Category.Name = reader.GetString(14);
}
Everything runs fine until it gets to reader.GetString(4).Trim();, which is null, so it throws an SqlNullValueException exception.
How can I gracefully handle these null values. It seems GetString & GetInt just throw exceptions when they encounter null values. I guess the solution I'm looking for would return null or 0 for a db null value.
How am I supposed to deal with this. Do I have to put if statements around each GetXX to check if it's null?
/\ |_ E X E GG
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I tend to use a set of wrappers to handle these. For instance:
public static string GetValue(IDataReader reader, string columnName)
{
int pos = reader.GetOrdinal(columnName);
if (reader.IsDBNull(pos))
return string.Empty;
return reader.GetString(columnName).Trim();
}This would make your code easier to maintain because you could do:
c.Notes = Utility.GetValue(reader, "Notes");
Deja View - the feeling that you've seen this post before.
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Another way to do this is to use a generic function:
public static T GetData<T>(IDataReader reader, string column)
{
if (reader.IsDBNull(reader.GetOrdinal(column)))
return default(T);
return (T)reader[reader.GetOrdinal(column)];
}Then, call it using
c.Category.Name = Utility.GetData<string>(reader, "categoryName");
Deja View - the feeling that you've seen this post before.
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I like this!
/\ |_ E X E GG
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If you can't handle NULL values in the client code, don't let them get into the databases. Set the column's nullable property to false (if creating the table in SQL, use columnname datatype NOT NULL).
I tend to use a cast with the indexed property which returns an object, which will leave a reference variable (such as a string) set to null, but cause a NullReferenceException if casting to a value type like int.
In general I prefer not to allow NULLs in the columns, at least in part to ensure that you can detect an outer join that didn't have a match (useful for doing a multi-column NOT IN equivalent).
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The issue isn't so much with the OP being unable to handle nulls in his code, but more to do with him looking for a simple way to handle them in the minimum amount of code.
Now, nulls definitely cause some contention - they almost seem to cause religious hysteria among developers. At their most basic, they are useful for identifying the absence of a value. Suppose that you wanted to capture if a person was married or not, it is valid to have three conditions; Yes, No and Unkown (or null). This could be because somebody didn't ask the question so you don't know whether or not they are. Oh well, that's enough rambling about nulls. It's time for me to go get a life again.
Deja View - the feeling that you've seen this post before.
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hi all,
i am trying to install sql server 2005 standard edition but an error message is still coming on which says:
SQL server cannot install files to the compressed or encrepted folder: c:\\..............
...........
does any one has an idea
10x
costavo
-- modified at 8:49 Wednesday 1st August, 2007
for sure i am an Admin
i dont know which and what folder is encrepted. i copied the installation files from the dvd to the hard disk
10x agian
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Is the folder compressed or encrypted? Are you running as administrator?
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in my system, SQL Server 2000 and SQL Server 2005 are there.
But I couldnt connect to SQL Server 2000.
Does anybody know why and how can i resolve this??
Thanks,
Saran
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If you have both sql 2000 and sql 2005 loaded on the same server one of them probably has an instances name. So if you sql server name is sqlserver1, only one of the sql servers can use that name the other one has to be an instance name. So I am guessing you know the name to one of the serves, but you need to figure out the name to the other one.
Hope that helps.
Ben
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hi
is there any one help me to run a query in MS Sqlserver periodical for example delete some data every 24hour that be independent from asp or php and etc...
i want that MS Sqlserver run it itself.
thanks
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Sql Server has the ability to schedule tasks inside and run them itself. If you are using SQL Server 2000, you will need to expand the Management node under your database, then expand SQL Server Agent and select Jobs. Right click and select New Job...
In the General tab enter a name. Select the Steps tab and New... to create a new task. Suppose that you want to run a particular delete (delete from myTab where @created > dateadd(dd, getdate(), 2)). Give the step a name and leave the type as Transact-SQL Script (TSQL). Choose the database that you want to run the task against and enter the SQL in the Command textbox. Click OK.
Next, go to the Schedules tab and create a new schedule. To change the times when it runs, select the Change button and set your schedule as appropriate.
Deja View - the feeling that you've seen this post before.
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