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gvector1 wrote:
In addition, can anyone tell me why using the oledb provider for odbc drivers will work with visual basic 6.0 but will not work with .NET???????????????
You have to install odbc.net drivers as much as I remember.
For using MySQL I think there is no problem with ADO.NET. Use the same connection string that you used before,everythinng else are the same.
Mazy
No sig. available now.
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I have ODBC.NET installed and it does that. I used the same connection that I used in VB6.0 in .NET and it tells me that I cannot use OLEDB provider of ODBC drivers. Why?????????????? Another question, I am trying to use MyOleDb for MYSQL and when I get to the point of creating a select statement, [Information Schema]is automatically inserted into the command. Ex.
SELECT INFORMATION_SCHEMA.patientfile.*
FROM INFORMATION_SCHEMA.patientfile
Even if it is displayed in the Server Explorer, it has [INFORMATION_SCHEMA] attached to it.
What is the deal with INFORMATION_SCHEMA???????????
Thanks,
Kendal
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Hi, everyone:
I am using VS.NET 2003 to create a winForm application ( Same result in VS.NET 2002). The application accesses MS Access DB so that an user can edit the DB.
When I have Datagrid bounded to the tables, all the updates (Insert,Delete and Update) work perfect. However, I have one table that I have to bound it to TextBoxes and CheckBoxes. If I insert or delete a record, it updates the DB fine. When I change the text in the texboxes, or click on the checkboxes, The record is supposed to be modified. When I click on my save button, I use table.GetChanges(DataRowState.Modified) to retrieve the changes. Surprisely, there is no changes, even though I thought I have the right binding.
Apparently, when I change the textboxes or checkboxes, the datarow status did not change to Modified. I can not figure out what I missed here. Please help. Thanks in advance.
Dion
More info:
I have columns as Text, Number and Yes/No in the MS Access DB. Here are the simplified code to do the binding:
For Number:
Binding b1 = new Binding("Text", dsMain1, "LMMaster.LMMasterLMSimConfig.LessonTime");
b1.Parse+=new ConvertEventHandler(TextStringToInteger);
b1.Format+=new ConvertEventHandler(IntegerToTextString);
txtLessonTime.DataBindings.Add(b1);
For Text:
txtConfig.DataBindings.Add(new Binding("Text", dsMain1, "LMMaster.LMMasterLMSimConfig.Config"));
For CheckBox:
chkboxHelp.DataBindings.Add(new Binding("Checked", dsMain1, "LMMaster.LMMasterLMSimConfig.Help"));
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Can we use Array In SQL Server ,if yes can any body tell how to use the same.
Is it possible to call a stored procedure recursively???
Any answer to the above questions will be highly appreciated
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Can we use Array In SQL Server ?
Yes..but using an indirect way : Create a temporary table like this :
<br />
CREATE TABLE #temp(Field1 INT PRIMARY KEY)
(put the above code in a stored proc or trigger etc..)
note the # before the name of the table :#temp this makes the temporary table available for the current connection.. ## will make it available to all connections
to free this table use:
DROP TABLE #temp
Is it possible to call a stored procedure recursively?
yes..but by default there is a limited number of nesting levels (31 I think) but you can change it..
hope this can help 
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Thanx for ur valuable suggestions.
Can i have a sample stored procedure which is called recursively.
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Simply call the same stored proc again in the code:
like this:
CREATE PROCEDURE MyProc<br />
AS<br />
.<br />
.<br />
--your code here<br />
.<br />
.<br />
exec MyProc<br />
.<br />
.<br />
GO
the nesting limit is 32 levels (this time i'm sure..got it from MSDN)
you can test for the nesting level using :@@NESTLEVEL
like :
select @@NESTLEVEL AS 'Outer Level'
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What is the best data Access method, that can be used in a large scale (.net/c#)
Enterprise Application.
For Data retrieve :
For Data Insert & update :
Gaurika Wijeratne. // www.gaurika.com
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For Data retrieve :
it depends !! if you want to populate a listbox for example use DataReader (it's fase , readonly , forward only)
For Data Insert & update :
SQlCommands are good enough
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 I make a windows service with ATL,and when I want to open a database in the service work thread(I creat a new thread), it doesn't work??? And when start the service in SCM, a error show: debug error ??? I don't know why?
Please help me , and if you have one sample ,give me one?
and my code below:
//if( !m_db.Open( _T("SmsSendBuff"),FALSE,TRUE,_T("ODBC;UID=sa;PWD=") ) )
//these two open operation doesn't work both!!!
//if(!m_db.OpenEx("DSN=SmsSendBuff;UID=sa;PWD=",CDatabase::noOdbcDialog);
_ConnectionPtr Conn1("ADODB.Connection") ;
HRESULT hr=Conn1.CreateInstance( __uuidof( Connection ) );
_bstr_t bsDSN = (L"SmsSendBuff");
_bstr_t bsEmpty = L"";
Conn1->ConnectionString = bsDSN;
//hr = Conn1->Open("dsn=SmsSendBuff;uid=sa;pwd=;","","",0);
AfxMessageBox("open...db");
hr=Conn1->Open(bsDSN,_bstr_t("sa"),_bstr_t(""),0);/*bsEmpty, bsEmpty, bsEmpty, -1 );*/
my email and msn: diyzhaodiyzhao@hotmail.com
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I wanted to know how I can create/design a DB that represents information in heirarichal or tree style.
and the tree levels can be of many levels.
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Here's an example of a table that mimics a directory structure:
create table directories(directory_id int primary key, directory_name varchar(255), parent_directory_id int)
Then add a constraint on parent_directory_id to reference directory_id.
This will then become a "self referencing" table. Any rows that contain a NULL value as a parent_directory_id will be a root node. All other rows are sub nodes of other rows.
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In the .NET documentation Microsoft is recommending usage of SQL server .NET data provider for accessing MSSQL 7 and above.
Will any one please tell me what are the advantages of using .NET library over OLEDB?
Uday
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Uday Patil wrote:
In the .NET documentation Microsoft is recommending usage of SQL server .NET data provider for accessing MSSQL 7 and above.
I believe the main differences are in optimization for speed.
-Nick Parker
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Hi Uday,
I think using SqlClient for accessing SQL Server 2000 in ADO.NET has good speed enhancments w.r.t. make-n-break connections, query update speeds and lot more.
DataSet too seems to have real good methods to update directly to the db. I have'nt fully explored this, since I am currently working with OleDb and IBM Db2 database.
Did this attend to your query?
Deepak Kumar Vasudevan
http://deepak.portland.co.uk/
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Thank you Deepak and Nick,
I gone through many documents related to this. I found some good things abt SqlClient. But I dont think them sufficient enough for change my application to support SqlClient.
For this I am conducting a benchmark test. I will be having results in my hands within a day or two. I will definately update you regarding results.
Thanks and regards
Uday
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Have any of you figured out a way to export and import text blobs with content greater than 64512 bytes? I have hunted and hunted through Google and the MSDN library, but nothing indicates a way to tell BCP to export more than the first 64512 bytes of the text on a row.
It may also help if there were a way I could set the default TEXTSIZE for all new connections, but I haven't found a way to do that either.
Any ideas? (If you have some nice little utility that can generate a series of INSERT statements to copy the content of the table, I could get that to work too. In fact, I'm starting to look for one, but hoping that I don't have to go that route.)
John
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Hello:
I return a DataSet from a Web Service's Web Method. But I don's want to use the default XML Schema of the DataSet. I want to use a customer Schema file for this returned DataSet.
I found the DataSet.InferXmlSchema(ByVal fileName As String,ByVal nsArray() As String) method ,But I am not sure about the second parameter of this method.
Can you give some help about this topic or more detail information.
Thank you very much.
liuage
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Hello,
I need to delete for instance tenth item from table returned by subquery in MSSQL. So the best solution is to have row with some index. I guess there is some "function" for this.
I mean something like this 
DELETE FROM (
SELECT SomeFunction AS 'index'
FROM table
WHERE conditions
) t
WHERE t.index = 10
Thanks
Daniel Balas - Student
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There is no T-SQL functionality that takes care of that. It would be impractical, since MSSQL (and others) return rows in "random order". You'l need to put on an index to be sure that it is deterministic.
However, you can probably fake the desired functionality, by using a subquery/join in your delete statement...
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Hmm... thanx
Daniel Balas - Student
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I have read a table from my db and want to create a list of the items in my table, for latter use etc.
I have the following code:
foreach( DataRow row in table.Rows )<br />
{<br />
Client client = new Client();<br />
client.SeqNo = 1;<br />
client.ClientCode = row[ "ClientCode" ].ToString();<br />
client.ClientID = row[ "ClientID" ];<br />
m_arlClients.Add( client );<br />
}
but when it gets to client.ClientID = row[ "ClientID" ]; I get a cast exception "cannot convert string to long" or somthing along those lines. My underlying database stores the ClientID as a long and that is how I want to store it in my client object.
How can I read the ClientID from the row obkect as a long?
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First you should try a cast... (int)row["ClientID"]
If that doen't work, you could try int.Parse(row["ClientID"])
BTW: Have you checked for (row["ClientID"] == DBNull.Value)
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Cheers for your reply.
Yes, I had tried a cast ... (long)row["ClientID"];
The field isn't null. But long.Parse( row["ClientID"].ToString() ); did the trick, thanks. I haven't been using C# very long, and have yet to learn all the tricks
Thanks once again.
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Hello,
I'm looking for a way to determine and display the differences between two datasets.
I'd like to display both datasets in DataList format and highlight only those items that are different.
My plan so far has been to:
(1)fill one dataset with the results of a query for all data associated with Project1 (call it "ds1")
(2)fill a second dataset with all data associated with Project2 (call it "ds2")
(3)iterate through each item in each row of ds1 and check it's value against the corresponding item in ds2
Note: Each dataset will have exactly the same schema.
Once I've been able to determine a difference, I'm stumped on how to change the backcolor of only that DataItem in the DataList. I've found a few examples on changing the color during the ItemDataBound and ItemCreated events, but those examples didn't take into account a comparison to another dataset rather than evaluation to static criteria...
Any help is greatly appreciated!!!
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