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Using MySQL 4.0 with .NET : Page 4

MySQL isn't just for Linux. And it has a lot of the same great features that you love SQL Server for. Find out what this open source database has to offer.


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Working with MySQL and Visual Studio .NET
Once you have installed MySQL you can begin working with it from Visual Studio .NET. The first step to working with MySQL and .NET is to download a data adapter that can work with MySQL. You can find the driver I am using for this article at the following Web site: www.bytefx.com

Once you have downloaded and installed the appropriate drivers you can begin working on your .NET/MySQL application.

Connecting to MySQL
To create a .NET/MySQL application, you need to create a new project and add references to the appropriate .NET driver; in this case the driver you want is called bytefx.data.dll. This driver provides all the classes necessary to connect to MySQL.

Now that you have created a project and added the appropriate references, you can begin writing code to attach to a MySQL database. To connect to a MySQL database you must create a connection object, specify a connection string, and open the connection. The following code snippet shows how to connect to a MySQL database. Note how similar the code here is to what you would use to connect to SQL Server; even the connection strings are similar.

Imports ByteFX.Data '-- create a connection string Dim cConnString As String cConnString = _ "Server=HOTH;Database=junk;User ID=root;Password=" '-- create a connection object and '-- specify the conn string Dim oConn As New MySqlClient.MySqlConnection oConn.ConnectionString = cConnString '-- open and close the connection oConn.Open() oConn.Close()

Querying MySQL Data
With the connection now available, you can begin querying data from your database. Listing 1 demonstrates how to query data from a MySQL database and display its contents in a data grid.

As you can see in Listing 1, querying data from MySQL is no different than SQL Server or any other database. You follow the same set of steps:

  1. Create a connection using the MySQLConnection class.
  2. Create a SELECT command to execute using the MySQLCommand class.
  3. Create an adapter using the MySQLDataAdapter class.
  4. Attach your query object to your adapter object.
  5. Create and fill a DataSet object using the adapter.
The .NET drivers for MySQL provide constructs exactly like those found in all of the other data adapters, including: Connection, Command, Parameter, Adapter, and other familiar data access objects.

Inserting MySQL Data
The next step is to add some data to your MySQL database. To add data to a MySQL table you do the following:

  1. Create a connection using the MySQLConnection class.
  2. Create an INSERT command to execute using the MySQLCommand class.
  3. Add parameters to the Command object representing the columns you wish to insert.
  4. Execute your command using the ExecuteNonQuery method.
Listing 2 demonstrates how to add data to a MySQL database using classes found in the ByteFx .NET driver.

As you can see, adding data to a MySQL database is very easy. If you have spent any time at all working with other databases you should feel right at home with MySQL.



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