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Hi,
I'm using VC++ to connect to a SQL Server. At first there was no problem.
But the program has grown and there are now 13 threads accessing the database.
Some too retrieve the data they need, while others put there data in it.
My question is the following: What is the best way to let this work?
a. use a single connection by all threads.
b. let every thread make its own connection.
c. some other solution ...
Can solution (a) give problems when using the same connection pointer in multiple threads.
Solution (b) seems logical but further investigation showed that u must make sure that there are enough concurrent user session on the SQL server. But does that mean that you need 13 CAL's or can you use a single CAL for the whole applications. I can't seem to find any answer to that question?
Thanks in advance
Kurt Pattyn
codito ergo sum
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Hi there,
Well I am starting to wade into the world of SQL however, I am stuck with a problem. At the moment I have two tables, product table and supplier table. In the product table I have a foreign key called supplierID which is the primary key of the supplier table. Using MS Access I have created a relationship between these two tables graphically, i.e. one to many relationship.
My problem is that I am trying to delete the supplierID column from the product table using queries.My problem is that I am not being allowed to delete the column supplierID from the product table due to an error:
"Cannont delete field 'supplierID'. It is part of one or more relationships".
My deletion query:
ALTER TABLE product DROP COLUMN supplierID
My question is how do i delete the existing relationship between the two tables I had created graphically ?
Any help will be highly appreciated.
thanks
EDIT:
I am interested in finding out how to delete the relationship programmatically 
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Try
ALTER TABLE tblname DROP CONSTRAINT constraintname
topcoderjax - Remember, Google is your friend.
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thanks for your reply. After looking at your response I realised I made Homer mistake in writing up initial post, doh!!!. The query you stated I already know.
What I meant to ask was how do you determine the name of the relationship between two tables programmatically?
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Hallo
You can't delete the column because as you said it is part of a foreign key constraint. In MS SQL 2K you can drop this column programmatically by first dropping the foreign key constraint. Access, however, does not appear to give the relationship constraint a name and therefore you can't drop it. As far as I can tell your best option is to use MS SQL 2K instead.
There are 10 types of people in the world, those who understand binary and those who dont.
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well I managed to workout a dirty hack that does the job. To remove the foreign key constraint from the table we need to determine the name of the relationship this is achieved by viewing the msysrelationship table. If you are in MS Access and enable the ability to view hidden objects and tables you will be able to view the msysrelationship table.
The msysrelationship table maintains relationship names as nameoftable1nameoftable2 i.e. if one table was product and the other was supplier then then relationship will productsupplier.
As long as you can access the msysrelationship table you are pretty much set. Then delete the relationship then drop the column easy!!!
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I am new to asp.net 2.0 and i am badly confuse....Any help which can point me in a correct direction...
When we should use SqlDataSource and when we should ado.net datareader etc...What are the criteria to choose.....
Please help...
Amit
Amy
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The SqlDataSource control allows a developer to access data stored in any relational database that supports ADO.NET. It can use the System.Data.SqlClient provider to access a SQL Server database, the System.Data.OleDb provider, the System.Data.Odbc provider, or the System.Data.OracleClient provider to access Oracle. Therefore, the SqlDataSource is certainly not only used for accessing data in a SQL Server database.
In order to use the SqlDataSource, you simply provide a value for the ConnectionString property and specify a SQL command or stored procedure. The SqlDataSource control takes care of working with the underlying ADO.NET architecture. It opens the connection, queries the data source or executes the stored procedure, returns the data, and then closes the connection for you.
Regards,
Satips.
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Thanks...But when we should go for SQL DataSource option vs command/datareader/dataset in real world...
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I have a very basic upload/download application. The app uses a select statement to download and a insert statement to upload. The reason I include those is because I am not sure how to get a progress report from them, ie completion percentage. I may be uploading upward of 100megs and don't want the user to just sit there waiting. I have tested a 5meg file and it takes about 3 minutes to upload and does so correctly, but the user has no idea what is going on.
How do I get progress of the SQL read/write so I can update my progress bar?
Thanks in advance!
And yes, I did post this in the C# forums, but I realized this belongs here.
The only way to speed up a Macintosh computer is at 9.8 m/sec/sec.
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Lets see the code you're using to do the INSERT. If you're using what I think you are, there is no progress reporting, and hence no progressbar possible.
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szSQLCommand1 = "INSERT INTO Files(Name, Size) VALUES(@Name, @Size)";<br />
szSQLCommand2 = "INSERT INTO FileData(Data) VALUES(@Data)";
I am not stuck to this approach though, I am looking for the way to do it...
I have SQL Server 2005 Full Edition up on a remote server that I have full access to if that comes into play.
I don't know too much about SQL or its different statements, procedures, ect. But a point in the right direction of what I need to learn and I can do that.
Thanks for the help, and the quick reply.
The only way to speed up a Macintosh computer is at 9.8 m/sec/sec.
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This isn't the complete code to do the upload.
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string szSQLCommand1;<br />
string szSQLCommand2;<br />
Int32 intFileSize;<br />
byte[] rawData;<br />
FileStream fsRead;<br />
<br />
try<br />
{<br />
fsRead = new FileStream(lblPath.Text, FileMode.Open, FileAccess.Read);<br />
intFileSize = Convert.ToInt32(fsRead.Length);<br />
<br />
rawData = new byte[intFileSize];<br />
fsRead.Read(rawData, 0, intFileSize);<br />
fsRead.Close();<br />
<br />
mySQLConnection.Open();<br />
<br />
szSQLCommand1 = "INSERT INTO Files(Name, Size) VALUES(@Name, @Size)";<br />
szSQLCommand2 = "INSERT INTO FileData(Data) VALUES(@Data)";<br />
<br />
cmd.Connection = mySQLConnection;<br />
cmd.CommandText = szSQLCommand1;<br />
cmd.Parameters.AddWithValue("@Name", txtName.Text);<br />
cmd.Parameters.AddWithValue("@Size", intFileSize);<br />
<br />
cmd2.Connection = mySQLConnection;<br />
cmd2.CommandText = szSQLCommand2;<br />
cmd2.Parameters.AddWithValue("@Data", rawData);<br />
<br />
cmd.ExecuteNonQuery();<br />
cmd2.ExecuteNonQuery();<br />
<br />
MessageBox.Show("File Inserted into database successfully!", "Success!", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);<br />
<br />
mySQLConnection.Close();
The only way to speed up a Macintosh computer is at 9.8 m/sec/sec.
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There is no way for this code to give you a progress update. This code will block on both ExecuteNonQuery statements. Neither can give you any kind of progress data, not the UI thread time to show it.
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Hey,
I am wondering if it is possible, and what would be the best way?
I'm working on a batch process to take care of building our applications, push/pull from source control and update the databases. As far as updating the DB, there will be a few scripts that need to run and I would like to call them from the same batch process that updates our executables (I really don't want to run a batch file AND set up a SQL job).
The goal is to have a single (1) job which will take care of everything to reduce the chance of error.
Can someone point me in the right direction?
Thanks,
Pualee
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For oracle you can use sqlplus calls, for Sql Server you can use iSql.
Mike Lasseter
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Thanks for the jumping off point, I'm looking into this, more specifically oSQL now 
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Hey guys,
I need to know how to add a table to a database in SQL Server 2000.
With C# code its possible to change tables, i.e to update or delete rows or whatever, but how can I create a new table? Is this possible? do you have any ideas?
thanks in advance
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Leia2011 wrote: how can I create a new table?
You can put pretty much any SQL command you like through an SqlCommand object. If you don't expect a result set back use ExecuteNonQuery()
Leia2011 wrote: Is this possible?
yes.
Leia2011 wrote: do you have any ideas?
See above.
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Hi
I have created one master job in sqlserver 2000 which run several jobs in different steps.
But it excutes all jobs at a time. I want that job run one by one.
I have set property like "Go TO Next in one finish successfully" but it didnt work in this case.
If i run several store procedures in one job then they run one by one as i need but when i put jobs inside job then they run simultaneously.
I also tried by putting each job in seprate store procedure and kept that store procedures in each steps but it also didnt work and run simultaneously.
I can not understand how to do it.
Could anybody give me the solution?
Thanks in advance.
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Jobs are meant to be independent of each other. How about using moving your code into a DTS package - with "success" constraints linking each task? The master job would then just need to execute that one DTS package.
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SOftware I'm using
Visual Studio 2005
SQL Express 2005
SQL Server Business Intelligence Studio
My Problem:
I created two reports and using the same parameter for each report. I add report2 to report 1 as a subreport and whenever I preview report1, report2 never shows as the subreport. I doubled, tripled check that they are using the same parameter but I read in another article that you need to pass a report parameter and not a query parameter? What's the difference? Help would be greatly appreciated.
Thanks
Jon
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Hi,
I need to find all the indexes in a table from access database.
please help me .
thank you.
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You could try the ADOX or DAO.
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