Tài liệu Creating a New Access Database pptx

[ Team LiB ]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 thr

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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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