i wanna to attach a Database from a dynamic path to a MSSQL server by coding a project to do this ,,
what is the code i should write and will it be a Windows Application or Console Application ,, or there is no difference ??
You can use any of the two. Just make sure the files are in a place the SQL Server in question can reach and then attach them with an sql statement.
Like this:
CREATE DATABASE [AdventureWorks] ON
( FILENAME = N’C:\Data\AdventureWorks_Data.mdf’ ),
( FILENAME = N’C:\Data\AdventureWorks_Log.ldf’ )
FOR ATTACH
In the connection string you can attach a database if the database has not already been attached. To do this in C# you should be able to do the following (this is untested):
SQLConnection conn;
try
{
conn = new SQLConnection(String.Format("Server={0};AttachDbFilename={1};Database=dbname; Trusted_Connection=Yes;", "Server Address", #"Path To Database"));
conn.Open();
conn.Close();
}
catch (Exception ex)
{
throw;
}
finally
{
conn.Dispose();
}
Let me know how you get on.
Regards,
Stu
Are you talking about using System.Data.SqlConnection class?
You can dynamically build your connectionString when you create your SqlConnection.
If I nderstand your question correctly, you are looking for a way to use a databse which the user will select (not the hard coded one).
Go here and learn about Saving User and Application Settings in WinForms. You will get some ideas.
Related
I have a Winforms application and database to save data from user.
When I insert data everything works fine but when I clean the solution and load the GUI of the database to see the old data.. I don't see the datam the datagridview is empty.
using (SqlConnection con = new SqlConnection(dataBase.Connection.ConnectionString))
{
using (SqlCommand wow = new SqlCommand("insert into GamesTbl(Type,Date,Time) Values(#type,#date,#time)", con))
{
wow.Parameters.AddWithValue("#type", "vsPC");
wow.Parameters.AddWithValue("#date", DateTime.Now.Date);
wow.Parameters.AddWithValue("#time", DateTime.Now.TimeOfDay);
try
{
con.Open();
wow.ExecuteNonQuery();
con.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
What is wrong?
EDIT: binding data on DBGui_load
private void DBGui_Load(object sender, EventArgs e)
{
dataGridView1.DataSource = playersTblBindingSource;
playersTblBindingSource.DataSource = DB.GamesTbls;
}
EDIT: my connection string:
"Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Database1.mdf;Integrated
Security=True;User Instance=True"
The whole User Instance and AttachDbFileName= approach is flawed - at best! When running your app in Visual Studio, it will be copying around the .mdf file (to the output directory - typically .\bin\debug - where you app runs) and most likely, your INSERT works just fine - but you're just looking at the wrong .mdf file in the end!
If you want to stick with this approach, then try putting a breakpoint on the myConnection.Close() call - and then inspect the .mdf file with SQL Server Mgmt Studio Express - I'm almost certain your data is there.
The real solution in my opinion would be to
install SQL Server Express (and you've already done that anyway)
install SQL Server Management Studio Express
create your database in SSMS Express, give it a logical name (e.g. Database1 - or while you're at it - give it a more sensible name...)
connect to it using its logical database name (given when you create it on the server) - and don't mess around with physical database files and user instances. In that case, your connection string would be something like:
Data Source=.\\SQLEXPRESS;Database=YourDatabase;Integrated Security=True
and everything else is exactly the same as before...
Seems liks you are missing DataBind.
private void DBGui_Load(object sender, EventArgs e)
{
dataGridView1.DataSource = playersTblBindingSource;
dataGridView1.DataBind(); // you are missing this
playersTblBindingSource.DataSource = DB.GamesTbls;
}
As an alternative solution, what you can do to fix the problem is to set the property of your database file in your solution as follows
Copy To Output Directory: do not copy
I am trying to find out what drive a database is on, on the server. To further elaborate, there is a sever "MyServer" and three databases on that server. Databases A and B are on the "C:\" Drive of that server and database C is on the "D:\" Drive. I want to know how I can use the connection string to try and get the drive letter so that when a user selects a database from an application it tells them what drive that database is on.
Currently I am trying the following means and not getting the correct response:
Private void GetDriveLetter()
{
string connectionString = String.Format(DatabaseInfo.CONNECTIONSTRING_TEMPLATE, dbName, server)
try
{
using (SqlConnection cn = new SqlConnection(ConnectionString))
{
cn.Open();
Server srv = new Server(new ServerConnection(cn));
Database database = new Database(srv, dbName);
txtDriveLetter.Text = database.PrimaryFilePath;
cn.Close();
}
}
catch (Exception ex)
{
myException = ex.Message
}
}
DatabaseInfo is just a class we use for reading SQL Servers and database names, and myException is a function that writes exceptions to a log file. The issue I am having is that no matter what I do I get an exception that says PrimaryFilePath is never set. Am I doing something wrong/missing something, or is this just not the correct way to go about this?
EDIT: Sorry never posted the exception
To accomplish this action, set property PrimaryFilePath.
You could always run a query against your sys catalog views inside SQL Server:
SELECT * FROM sys.master_files
This will list your database, it's id, its logical name, and the location of the file on disk.
You should probably access the existing database, rather than constructing a new one:
Database database = srv.Databases[dbName];
(Of course, error handling required if the name doesn't exist).
Also, of course, you should be aware that a database may consist of multiple files, and those files may be on different drives.
If this is SQL Server, then you can use
SELECT * FROM sys.database_files
to get the files of the current database. So, your connection string should connect you to the database that you want and then the above SQL will give you lots of information that you might find useful, including the physical_name. From that you can extract the drive letter.
So this is probably the most naive question but that is what questions are for I guess;
Then, my issue is that I have no idea on how to connect Visual C# Express 2010 to Access 2007 and do the typical insert, update, delete, search in an application in C#, I have just learned the basics (finished a console tutorial, which I believe is more than enought, having previous background of VB6 using access 97), and I have been searching here and in the web, but the only thing I could find where the msdn tutorials which I dind't find really clear.
So in my app I just need to link comboboxes, query those values to obtain new ones, do calculations and then store in arrays (and maybe show these in datagrids as well as edit them from said datagrids, which is a bit more complicated I guess) and finally store them in various tables, but I haven't really found a strong (or most likely simple) manual that will guide me to create the typical app insert, update, delete using winforms.
Do you guys have any good links in order to do this?
Thanks.
You can try with this code
Here link about string connection : http://www.connectionstrings.com/access-2007
var query = "...";
var connectionString = "...";
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
// The insertSQL string contains a SQL statement that
// inserts a new row in the source table.
using(var command = new OleDbCommand(query))
{
// Set the Connection to the new OleDbConnection.
command.Connection = connection;
// Open the connection and execute the insert command.
try
{
connection.Open();
command.ExecuteNonQuery();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
// The connection is automatically closed when the
// code exits the using block.
}
}
Right, I have been tasked with developing a new application in MVC3 that unfortunately has to integrate very slightly with a classic asp web site. This won't be forever as the old site will get an update at some point, but not yet. In the mean time however the new MVC3 application will need a little bit of access to the database for the old site, which is a old MS Access .mdb whereas the new app will be using sql server 2008.
I would greatly appreciate it if someone could give me some examples of how to connect to the access db, aswell as how to execute sql queries (i am fine writing the sql, just got no idea how to execute against the database from my mvc3 app).
thanks in advance
EDIT: I've not got much experience with the old site, but it appears to use the JET adaptor if that helps! ;-)
Your question requires an answer too extensive to be given in detail
I will give you a check list of things and class to research
Define the connection string used to reach your database [see
here]
Create and open the OleDbConnection
Define your OleDbCommand and the command text to be executed
Create and use an OleDbDataReader to read your data line by line
Create and use an OleDbDataAdapter to read your data and load a
DataSet or DataTable
Now don't forget to close your connection and use parametrized query
string connectionString = Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb;Jet OLEDB:Database Password=MyDbPassword;
public void InsertRow(string connectionString, string insertSQL)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
// The insertSQL string contains a SQL statement that
// inserts a new row in the source table.
OleDbCommand command = new OleDbCommand(insertSQL);
// Set the Connection to the new OleDbConnection.
command.Connection = connection;
// Open the connection and execute the insert command.
try
{
connection.Open();
command.ExecuteNonQuery();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
// The connection is automatically closed when the
// code exits the using block.
}
}
I have a problem,
private void button_Submit_Click(object sender, EventArgs e)
{
try
{
string connectionString = #"Data Source=Database_TouchPOS.sdf;Persist Security Info=False;";
using (SqlCeConnection connection = new SqlCeConnection(connectionString))
{
using (SqlCeCommand command = connection.CreateCommand())
{
connection.Open();
command.CommandText = "INSERT INTO Product (Title,Price,Category_Id) VALUES (#title, #price,#category_Id)";
command.Parameters.AddWithValue("#title", textBox_Title.Text);
command.Parameters.AddWithValue("#price", textBox_Price.Text);
command.Parameters.AddWithValue("#category_Id", comboBox_Category.SelectedIndex);
command.ExecuteNonQuery();
MessageBox.Show("Product Added Successfully...");
}
connection.Close();
}
}
catch (SqlException ex)
{
MessageBox.Show(ex.Message);
}
}
Everything seem to be fine, but still can't add data into database.
I did try with complete database path, example c:\project\database.sdf
I did a lot of search before asking. I saw similar problems but not even a single one works for me.
Data are added when compiling but not committed to database. I can see the data after second attempt of debugging.
Please kindly try to explain in detail.
Thanks
You are probably facing this, http://erikej.blogspot.com/2010/05/faq-why-does-my-changes-not-get-saved.html suggest you use a full path to your database file in your connection string.
Did you try to use transactions explicitly?
IDbTransaction transaction = connection.BeginTransaction();
//add to database
transaction.Commit(); // before close connection
This is a very old thread, so I don't know if it will help anyone if I put my answer.
I had this problem, too.
When I executed an update or insert code in C#, apparently, everything was ok, but when I looked up the database, there was no change.
The thing was that while debugging I had the database opened in a Management Studio. And somehow this obstructed the database changes even when there was no error message.
Closing the Management Studio and opening it after executing the code, the changes where perfectly stored in the data base.
Regards.
complete example for those seeking like me... #"Data Source=C:\Users\MYPC\Documents\Visual Studio 2010\Projects\MyProjectFolder\MyProject-1\bin\Debug\MyDatabase.sdf;Persist Security Info=False;";
thank for this example. This saved my day.