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There is an 18 part series on DataGrids at
http://aspnet.4guysfromrolla.com
I'm not sure which part is the one your looking for, but I've found it very helpful.
Also, you may want to post your actual code and highlight what row you are getting the error.
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in:
mydataadapter.Update( mytable );
the table is that bound to datagrid and changed. i want my database to change too.
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Is your datagrid fully editable or are you just updating one row at a time with an edit button?
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I want it to be editable. but i put that code in a button click but it didnt work.
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I really recommend going through those articles at 4guysfromrolla. They have one section on how to make a row editable with an edit button and another section on how to make the entire datagrid editable. It goes how to make the template columns and such. The code behind is in vb though (I'm a c# person) but it's pretty straightforward.
I printed all 18 articles off (some have Go to part 2 so note that), sat down and read through the sections I thought would help. I think this would be a great place for you to start if you're not too familiar with datagrids.
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I had asked about output parameters yesterday as I had not worked with them before. I did get a response but I am still having some issues. Here is my current stored proc:
CREATE PROCEDURE [dbo].[UpdatePart_Step_1_Test] @PartNumber varchar (15),<br />
@PartTypeDescription varchar (60),<br />
@ID int OUTPUT<br />
AS<br />
declare @pt_id integer, @ThePartNumber integer<br />
<br />
if NOT EXISTS (Select * from Parts where PartNumber = @PartNumber)<br />
BEGIN<br />
<br />
SELECT @pt_id = pt.ID FROM PartTypes pt <br />
<br />
INNER JOIN Parts p on pt.ID = p.PartTypeID<br />
<br />
WHERE pt.Description = @PartTypeDescription<br />
<br />
insert into Parts<br />
(PartNumber, PartTypeID)<br />
<br />
VALUES<br />
(<br />
@PartNumber,<br />
@pt_id<br />
)<br />
<br />
<br />
END<br />
SELECT @ID=@@IDENTITY<br />
return 0<br />
GO
Here is the c# code that calls the stored proc. Note I have some additional parameters declared but I am not yet sending.
private void btnAdd_Click(object sender, System.EventArgs e)<br />
{<br />
strPartNumberInputReference = txtSearchPart.Text;<br />
strDwgNumber = txtDwgNumber.Text;<br />
strDwgRevision = txtDwgRevision.Text;<br />
strDwgLocation = txtDwgLocation.Text;<br />
<br />
ds2 = new DataSet();<br />
SqlParameter param1 = new SqlParameter("@PartNumber", strPartNumberInputReference); <br />
SqlParameter param2 = new SqlParameter("@DwgNumber", strDwgNumber);<br />
SqlParameter param3 = new SqlParameter("@DwgRevision", strDwgRevision);<br />
SqlParameter param4 = new SqlParameter("@DwgLocation", strDwgLocation);<br />
SqlParameter param5 = new SqlParameter("@PartTypeDescription", strPartTypeID);<br />
SqlParameter param6 = new SqlParameter(@ID, SqlDbType.Int);<br />
param6.Direction = ParameterDirection.Output;<br />
<br />
ds2=SqlHelper.ExecuteDataset(this.connectionString, CommandType.StoredProcedure,"dbo.UpdatePart_Step_1_Test", param1, param5);<br />
dt2 = ds2.Tables[0];<br />
}
The problem is that when I try to add I get the error: Procedure 'UpdatePart_Step_1_Test' expects parameter '@ID', which was not supplied
Okay, did some additional reseach and it appears I need to something like the following: (taken from a previous CodeProject post)
DECLARE @MyTitle varchar(50),<br />
@ytd int<br />
SET @MyTitle = 'Some Title'<br />
EXEC dbo.YtdSales @MyTitle, @ytd OUTPUT<br />
SELECT @ytd
I'm not sure where to insert these bits (set, exec, select)into my existing code.
Can someone help me or tell me what is wrong with the original sp?
Thanks!
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Your call to ExecuteDataset references param5, where the parameter called @ID is actually param6. I think this is the problem!
Since your procedure actually does an INSERT, I'd look at using SqlCommand.ExecuteNonQuery since you're not actually returning a resultset. Filling a DataSet is overkill.
It often helps to prevent the client side from getting confused by putting SET NOCOUNT ON at the top of your procedures. This means that the rowcounts from any operations that don't actually return a result set aren't sent to the client. IIRC, if you don't use this SET statement, you can end up getting empty resultsets, which may appear (it's been a while since I did this) as empty DataTables in your DataSet.
Stability. What an interesting concept. -- Chris Maunder
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Actually I need to pass all three. Thanks for catching that. Param 1 is the part number, param 5 is the part type, and param 6 the ID for output. So now I have:
ds2=SqlHelper.ExecuteDataset(this.connectionString, CommandType.StoredProcedure,"dbo.UpdatePart_Step_1_Test3", param1, param5, param6);
I revamped some earlier code. Basically the part type is a drop down box with a description, but now I send the actual partTypeID. So now my stored proc looks like:
CREATE PROCEDURE [dbo].[UpdatePart_Step_1_Test3]<br />
@PartNumber varchar (15),<br />
@PartTypeValue varchar (60),<br />
@ID int OUTPUT<br />
<br />
AS<br />
<br />
if NOT EXISTS (Select * from Parts where PartNumber = @PartNumber)<br />
BEGIN<br />
<br />
insert into Parts<br />
(PartNumber, PartTypeID)<br />
<br />
VALUES<br />
(<br />
@PartNumber,<br />
@PartTypeValue<br />
)<br />
<br />
END<br />
SELECT @ID = @@IDENTITY<br />
<br />
<br />
return 0<br />
GO
-- modified at 15:43 Wednesday 12th July, 2006
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Hi,
This is how I code:
.aspx page --> BLL class --> DAL class --> BLL class --> .aspx page
In my stored procedure I usually do a test to see if a record has been inserted or updated. To test for an inserted record success, my code is:
-- Check for insert error
IF (@@ERROR <> 0)
BEGIN
SET @ErrorCode = -1; -- SQL Server error
GOTO CleanUp;
END
-- Commit transaction
IF (@TranStarted = 1)
BEGIN
SET @TranStarted = 0;
COMMIT TRANSACTION;
END
RETURN 0;
So if there happens to be an error it will return a -1. Now in my returned parameter, how do I throw this exception based on -1??? Is this the correct way to do it, or is there a better way of doing this? And where should I throw this exception, in my .aspx page, the BLL class, or the DAL class?
Please advise.
Regards
ma se
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You can use @ErrCode as output parameter, @ErrCode value can be collected in .aspx.vb or class file by following codes:
Comm.Parameters.Add("@ErrCode", SqlDbType.Int).Direction = ParameterDirection.Output
Comm.ExecuteNonQuery()
dim returnvalue as integer=comm.Parameters("@result").Value
Kumar
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Ok thanks, but what happens if I want to return @ErrCode, or my own error code, for example -1 or a -2, etc, or the ID of the new car?
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I need to create database file(*.mdb) programmatically, how can I do it?
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use CREATE DATABASE as below:
CREATE DATABASE [testDB] ON (NAME = N'test', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL\data\AraWorkFlow_Data.MDF' , SIZE = 3, FILEGROWTH = 10%) LOG ON (NAME = N'AraWorkFlow_Log', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL\data\AraWorkFlow_Log.LDF' , SIZE = 1082, FILEGROWTH = 10%)
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You are asking how to make an .mdb (which is a MS Access database).
See this post: clickety[^]
--EricDV Sig---------
Some problems are so complex that you have to be highly intelligent and well informed just to be undecided about them.
- Laurence J. Peters
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Hello, is it possible to iterate trough all tables in a database with SQL syntax?
My problem is that i would like to programatically have the possibility to make an xml-backup of the entire database to a remote computer. But the number of tables is unknown during design time.
R.
Johan
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You can use following select statement which return no of user tables available in database
select name from sysobjects where type='u'
name column give you table name
Kumar
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There are some system catalogs that can help, but it varies from database vendor to database vendor. If you're using C++ there are some ATL DB client side helpers for this.
Steve S
Developer for hire
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Some databases support INFORMATION_SCHEMA views you can query:
SELECT * FROM INFORMATION_SCHEMA.TABLES
then loop through the results (be sure to look at the field TABLE_TYPE to see what type of table it is
Now select the columns for each table:
SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'Current table name'
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Perfekt, this one was easy..
THX
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Hi
I am developing a UserControl, I save this user control code to the database, which will be loaded dynamically to the Page.
In my user control code consist of following lines:
<asp:SqlDataSource ID="GetDataFromDatabase" runat="server" ConnectionString="<%$ ConnectionStrings:sConnectionString %>"
SelectCommand="SELECT field_defaultvalue FROM cp_productfields WHERE field_product_id='ProductID' AND field_type='DropDownList' AND field_Control_ID='ddVCAuflag'"
ProviderName="<%$ ConnectionStrings:sConnectionString.ProviderName %>"></asp:SqlDataSource>
At this moment, I am manually puting this data to data
base using "INSERT INTO" statement.
But I get following error:
Incorrect syntax near 'ProductID'.
This is because single quotation mark around ProductID (field_product_id='ProductID').
If I change this single quotation to double quotation (e.g. field_id="ProductID") then this works okay.
But in that scenario, SELECT statement fails while execution.
Can anyone please let me know how can I achieve both successfully?
Thanks in advance.
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Did you try using :
"SELECT field_defaultvalue FROM cp_productfields WHERE field_product_id='" & ProductID & "' AND field_type='" & DropDownList & "' AND field_Control_ID='" & ddVCAuflag & "'"
??
thanks.
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Hi,
I just have a couple of questions on the DAAB:
When using db.AddInParameter and the input parameter is an empty string, does it automatically add DBNull.Value to the coloumn? Or should I rather then create a method that checks for an empty string, if it is empty then add DBNull.Value to that coloumn (if it accepts NULL values).
How to get the returned value and throw an exception to the user? I usually have a @ReturnValue parameter, with ParameterDirection.ReturnValue. I was thinking of not doing it this way but rather something like:
using (dbCommand = db.GetStoredProcCommand(strSProc))
{
db.AddInParameter(dbCommand, "@CarName", DbType.String, objCar.Name);
// Rest of the parameters
IDataReader rdr = db.ExecuteReader(dbCommand);
if (rdr.Read())
{
// Do convertions here of what was returned from the stored procedure
}
}
Please can someone help advise.
Regards,
ma se
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String or any parameter except int accept Null value for empty parameter.
Kumar
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I have the following using block (not all code is displayed):
try
{
using (dbCommand = db.GetStoredProcCommand("sp_GetAllCars"))
{
rdr = db.ExecuteReader(dbCommand);
while (rdr.Read())
{
Car objCar = new Car();
objCar.ID = rdr.GetInt32(0); // Required
objCar.Name = rdr.GetString(1); // Required
// Add Car instance to array
carList.Add(objCar);
}
// Close the reader object
rdr.Close();
}
}
catch (SqlException ex)
{
HandleSQLError(ex, "sp_GetAllCars");
}
finally
{
dbCommand.Dispose();
}
What does the using block close and dispose of, because I am thinking that I am closing uneccessary stuff. I always thought that the using block only closed this that were declared in the brackets like:
using (...only closed what inserted here...)
{
...
}
Please can someone comment.
Regards,
ma se
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