Tài liệu Creating a New Access Database pptx

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Recipe 10.6 Creating a New Access Database
Problem
You need to create a new Microsoft Access database.
Solution
Use ActiveX Database Objects Extensions (ADOX) from .NET through COM interop.
You'll need a reference to Microsoft ADO Ext. 2.7 for DDL and Security from the COM
tab in Visual Studio .NET's Add Reference Dialog.
The sample code contains an event handler and a single method:
Button.Click
Allows the user to specify the filename for the new Access database and then calls
the CreateAccessDatabase( ) method in the sample to create the database.
CreateAccessDatabase( )
This method uses ADOX through COM interop to create the new Access database
having the specified filename.
The C# code is shown in Example 10-6
.
Example 10-6. File: CreateAccessDatabaseForm.cs
// Namespaces, variables, and constants
using System;
using System.Windows.Forms;

// . . .

private void createButton_Click(object sender, System.EventArgs e)
{
// Create the save file dialog object.
SaveFileDialog sfd = new SaveFileDialog( );
sfd.InitialDirectory = System.IO.Path.GetTempPath( );

// Set the filter for Access databases.
sfd.Filter = "Microsoft Access (*.mdb)|*.mdb";

// Open the dialog.
if (sfd.ShowDialog( ) == DialogResult.OK)
{
// Of OK selected, create the Access database.
String fileName = sfd.FileName;

try
{
CreateAccessDatabase(fileName);

MessageBox.Show("Microsoft Access database " +
fileName + " created.", "Create Access Database",
MessageBoxButtons.OK,
MessageBoxIcon.Information);
}
catch (System.Exception ex)
{
MessageBox.Show("Could not create database " +
fileName + ". " + ex.Message,
"Create Access Database",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}

private void CreateAccessDatabase(String fileName)
{

String connectString =
@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
fileName + ";";

// Use ADOX to create the Access database.
ADOX.Catalog cat = new ADOX.Catalog( );
try
{
cat.Create(connectString);
}
finally
{
cat = null;
}
}
Discussion
ADO Extensions for DDL and Security (ADOX) extends the ADO objects and
programming model with objects for schema creation and modification, and for security.
ADOX is used to programmatically access and manipulate the objects in a database.
You can use ADOX from .NET through COM interop to create a new Microsoft Access
database. Use the Create( ) method of the ADOX.Catalog object, passing a connection
string for the new Access database as the argument.
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