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Hi Kaylan
instead using the '\n' character use Environment.NewLine. This should help.
Regards
Sebastian
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Try '\r\n' in place of '\n', May it solve your problem
love2code
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Hi, i am new to ado.net so soory, if it seems like a stupid question.
I have filled a datatable with data by a simple query.
i have a datagrid, which doesn't need to show all the columns of the table,
how can i show only some of the columns without needing to query again?
can a dataview show parts of the datatable i have?
thanks,
Nir.
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Hi Nir,
what kind of datagrid do you use (the one for WebApplications or the one for WindowsApplication)?
1) for WebApplications:
just do a right click on your DataGrid and select PropertyBuilder and then add all columns
that should be mapped and displayed
2) for WindowsApplications:
use the property TableStyle. This property defines, like the one for datagrids within WebApplications,
which columns should be mapped and displayed.
If you have any further questions don't hesitate to post again.
Regards
Sebastian
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Also, make sure the auto create columns property is set to false. Otherwise the datagrid will contain all columns in the datatable plus those you added as above.
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thanks for the quick reply,
I'm using WindowsApplication and the datagrid is filled at run time.
i have a function which executes a query and return datatable
this datatable (some columns of this table) should be the datasource for the datagrid.
I tried to use the TableStyle like this whit no success
QueryStr = QueryStr + "select * from Trainee "
DT = db.selectQuery(QueryStr) ' returns datatable
Dim TS As New DataGridTableStyle
Dim CS As New DataGridTextBoxColumn
TS.MappingName = "UpdateTable"
CS = New DataGridTextBoxColumn
CS.MappingName = "FirstName"
CS.Width = 50
TS.GridColumnStyles.Add(CS)
CS = New DataGridTextBoxColumn
CS.MappingName = "LastName"
CS.Width = 50
TS.GridColumnStyles.Add(CS)
CS = New DataGridTextBoxColumn
CS.MappingName = "ID"
CS.Width = 50
TS.GridColumnStyles.Add(CS)
CS = New DataGridTextBoxColumn
CS.MappingName = "Mobile"
CS.Width = 50
TS.GridColumnStyles.Add(CS)
UpdateGrid.TableStyles.Add(TS)
UpdateGrid.DataSource = DT
how shpuld i connect the datasource?
thanks
nir.
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Hi Nir,
look at the message from mark to turn autocreatecolumn off and be sure that you only add those columns to the tablestyle that should be displayed. Did you named the datatable like the mapping name of the table style ('UpdateTable')? Try to use a UpdateGrid.DataBind() to be sure that data will be binded to the grid.
Please let me know if this hint had helped you.
Regards,
Sebastian
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Thanks for your help, it worked.
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Clear the tablestyle first and then add the new tablestyle. Dont create DataGridTextBoxColumn for the columns you dont want to display. If you want I can send you a small sample.
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Thanks for your help, i managed to create the table style.
nir.
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I have a list box which shows the tables in the database.I don't want to show the real table name instead an alias for those tables names should go how this can be done
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Just don't show the names. Replace the displayed text with whatever you want the user to see. You can use the tag property to store the actual name or maintain an array indexed by the listbox index.
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Create one DataView from Data Source or Manually replace those table name with your logic...
I have created a fake table, in real situation , query from database
/// Create DataSource :: select tablename,tablealias from all_tables
/*Code::*/
ICollection CreateDataSource() {
DataTable dt = new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("TableName", typeof(string)));
dt.Columns.Add(new DataColumn("TableAlias", typeof(string)));
for (int i = 0; i < 9; i++) {
dr = dt.NewRow();
dr[0] = i.ToString() + " No Table";
dr[1] = i.ToString() + " No Alias";
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
return dv;
}
// Fill the list with above mentioned datasource
private void FillList()
{
ListBox1.DataSource = CreateDataSource();
ListBox1..DataTextField="TableName";
ListBox1.DataValueField="TableAlias";
}
happy programming..
Pijush Biswas, Jaisalmer
softestpk@yahoo.com
love2code
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hi
Im trying to use reporting services in sql 2005.
ı want to ask that can ı change my datasource in my report project dynamically? ı have another .net 2005 project and ı have a datagrid here. ım using this report for printing this datagrid. can ı pass this datagrid(or its datasource) to my report?
thanx...
Ali Sapancı
alisapanci@gmail.com
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are there anyone whom thinking about something about that matter? or, can't ı explain my problem to you? 
ı think ı must explain this again;
ı have a report project in a server and ı have a datagrid in my other project. ı want to report this grid with using this report project. when ım doing this, ı want to use this datagrid's datasource in my report project. can ı pass this datasource in my report project dynamically?
thanks for your help,
Ali
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I posted this question before bit I think I may have asked it wrong. I want to set up a program to query 1 field in the DB by pressing a button and then displaying the results in a listbox. At which point I can click in the listbox and display the record in the textboxes.
BINARY
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if you are showing an ID field in your list you can use the id ( whenever is selected by the user) and select the record and then show its field in your text boxes.
for example:
using System.Data;
using System.Data.OleDb;
public void listbox_click(object sender,EventArgs e)
{
string selecet_string="SELECT * FROM MyTable WHERE id="+listbox.selectedItem.ToString();
DataSet ds=new DataSet();
OleDbDataAdapter adapter=new OleDbDataAdapter(select_string,cnn) //you should pass your own connection object.
adapter.Fill(ds);
//Then you can fill the text boxes
textBox1.Text=ds.Tables[0].Rows[0][0].ToString();
//etc.
}
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I am useing an OleDbDataAdapter with an OleDbConnection. This is connecting directly to a Microsoft Access database (.mdb) with Jet4 inside of a web form ASP.Net page useing Visual Basic.
I have a datagrid object on the page which is databound to the dataset useing the following code.
OleDbDataAdapter1.Fill(DataSet41)
DataGrid1.DataBind()
The code is placed in the page's load event and the .mdb database file as full user permision on the ASP.NET account.
Here is the interesting part that I have discovered. We all know that when you open a database that it will create a .ldb file for locking. When I run the web form it will generate this error.
Could not lock file.
Exception Details: System.Data.OleDb.OleDbException: Could not lock file.
Source Error:
Line 101: Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Line 102: 'Put user code to initialize the page here
Line 103: OleDbDataAdapter1.Fill(DataSet41)
Line 104: DataGrid1.DataBind()
Line 105: End Sub
After playing with this for a while what I did was set the .ldb files ASP.NET permissions to also have full user control for read and write. When I run the page with this .ldb files permissions set in this manner the datagrid will populate the information from the dataset with no errors.
Here is my problem... when you close the webform naturally the .ldb file is deleted automatically. When I run the webform again it will generate another .ldb file but the permissions are back in its orrigional form and I receive the same error "Could Not Lock File" as above.
How do I solve this problem? It appears to me the issue is the .ldb files permissions must be set to accept the ASP.NET read/write permissions but this is a temperary file. Any suggestions as to how I can fix this issue I would really appreciate the help!
Javolin
VB.Net, ASP.Net
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I just install the Mdac Sdk 2.8 (I got Windows XP sp1, VC 6 sp5 with Platform Sdk of February 2003 and Msxml Sdk 4.0).
When I compile PRIVLIB.LIB, I got error as "fatal error C1083: Cannot open include file: 'msxmloledb.h': No such file or directory".
I search msxmloledb.h anywhere but can't get it !!
No result in Msdn or google and so on.
Anyone could tell me where is the "msxmloledb.h" file ? where can I get it ?
Thks by advance
Not a developper, just learn programming since 1 month
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Hello,
I have windows form application that is updating an sql2k db. Because we want serial keys we have decide to not use SQL2k to generate the keys. To facilitate this we have a table that holds the last key (lastkey) for each table. Right now for each insert into a table this key table must be hit and updated. So in code we have a
Select lastkey form tbKey into an ADO recordset
Update tbKey set lastkey = rs(0)+1
Now that has worked for 3 years. Yesterday it broke. Two applications selected lastkey at the same time and thus inserting the same PK into a table. That sucked what sucked more is that it was a published database so it took out all of the subscribers.
I’ve come up with this bit of sql to update and get the the key at the same time, within one record lock.
declare @Last_System_id int
update tbkey
set tbkey.lastkey =(lastkey+1), @Last_System_id = lastkey+1
where tbname='sometablename'
select @Last_System_id as myKey
I can’t figure out how to execute it with ADO and VB6. Actually it executes just fine. I can’t figure out how to get that select to return into a recordset.
I’ve tried this.
Dim sUpdate as string<br />
Dim NewKey as int <br />
sUpdate = "declare @Last_System_id int update tbkey set tbkey.lastkey =(lastkey+1), Last_System_id = lastkey+1 where tbname='sometablename' select @Last_System_id as myKey"
<br />
Connection.open<br />
Set my_Recordset = Connection.Execute(sUpdate)<br />
NewKey = my_Recordset(0)
My_recordset is empty I also tried:
<br />
My_Recordset(1)<br />
My_Recordset("myKey")
All give me this error “Run-time error ‘3265’ Item cannot be found in the collection corresponding to the requested name or ordinal.”
Any insight will be much appreciated.
Thanks Ron
Ronald Hahn, CNT - Computer Engineering Technologist
New Technologies Analyst
HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net
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I have done something similar. My solution is to generate the Primary Key using a SP.
CREATE TABLE dbo.Sequence
(
TableName varchar(30) NOT NULL,
NextVal int NOT NULL
)
LOCK DATAROWS
go
IF OBJECT_ID('dbo.Sequence') IS NOT NULL
PRINT '<<< CREATED TABLE dbo.Sequence >>>'
ELSE
PRINT '<<< FAILED CREATING TABLE dbo.Sequence >>>'
go
CREATE PROCEDURE GetSequence (
@tbl varchar(30))
AS
DECLARE @nextval int
BEGIN
BEGIN TRAN
UPDATE Sequence
SET NextVal = NextVal + 1
WHERE TableName = @tbl
IF @@rowcount = 1
SELECT @nextval = NextVal
FROM Sequence
WHERE TableName = @tbl
COMMIT TRAN
SELECT @nextval
END
Hope this helps.
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Thank you for the reply.
At this shop we don’t like using SP’s. The best reason I can come up with is that the boss simply doesn’t trust MS enough to let SQL2k handle such things. But that is a cool bit of code thanks.
We have come up with this solution on the software side. We will no longer care if there is a multiple or Phantom read from the key table, the function will take what ever key it gets; however, on the insert, if a phantom read has occurred, we will catch the Duplicate PK error generated by sql and go back and grab another new Key. I know that I specified that we needed a serial key but this solution will be nearly 100% serial and for the times that the sequins is broken there will only be, statistically, one or two missed. And that won’t hurt us. The reason we need serial is to make DB maintenance easer.
Simply put one error try again.
Ronald Hahn, CNT - Computer Engineering Technologist
New Technologies Analyst
HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net
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Sounds like you also don't trust SQL2k to generate the PK as an identity either, if you did the simple solution would be to make the PK field an Integer identity type with an increment of 1...eliminating the need for the PK table and the round trip to get the pk.
Absolute faith corrupts as absolutely as absolute power
Eric Hoffer
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke
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Agreed. I dont trust SQL2k to generate the PK as an identity. I have seen in some situations when the Server crashes enormous identity gaps are created. The only solution in this case is to BCP out the data, drop and recreate the table abd then BCP in. It has happened twice with me. So I dont use identity columns anymore.
Live Life King Size
Alomgir Miah
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