Single Type that mysqlconnection and sqlconnection can be used

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Ok I have a vb.net application I am developing at the moment. Its purpose is to be a helper application so it will automatically create each of the following:
StoredProcedures for Database
Class Files for VB.net
windows forms for vb.net
It works perfectly with MySql databases and I can get it to work also with MsSql but my question is this.... in my code I need to declare two separate connections for mysql and mssql as follows:

VB

Protected DbConnectionMySql As MySqlConnection
Protected DbConnectionMsSql As SqlClient.SqlConnection

I then proceed to use these as follows:

VB

If (frmMain.SQLServerType = "mysql") Then
                Me.DbConnectionMySql.Open()
                Me.dtSchema = Me.DbConnectionMySql.GetSchema("Columns")
                Me.DbConnectionMySql.Close()
            ElseIf frmMain.SQLServerType = "mssql" Then
                Me.DbConnectionMsSql.Open()
                Me.dtSchema = Me.DbConnectionMsSql.GetSchema("Columns")
                Me.DbConnectionMsSql.Close()
            End If

This is easy as its only a few lines but its painful with longer code.
I would like to map or Cast each connection to a single variable that can be used so I only have to code once.

I am thinking a generic type that implements the IDBConnection interface would work but its kinda confusing me.... any idea, directions, help is appreciated!

This was meant to be a helper application to automate the more time consuming tasks of developing larger applications.

Posted 24-Mar-12 10:59am

chris.obrien.07

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3 solutions

Solution 1

You should use the .NET Framework Data Providers (ADO.NET)[^], with allows you to connect to all kinds of databases.

Piet

Posted 24-Mar-12 11:19am

pietvredeveld

Solution 3

You should be using the factory pattern[^] with the ADO.Net Factory classes. Here[^] is an aexcellent article to start with.

Good luck!

Posted 25-Mar-12 21:26pm

Wayne Gaylard

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Bernhard Hiller · Accepted Answer · 2012-03-25T20:51:00

IDbConnection is the correct way. Instead of having to variables DbConnectionMySql and DbConnectionMsSql, you'll use only one:
Dim _Connection as IDbConnection.
When the connection object is created, you still have to distinguish:

VB

If (frmMain.SQLServerType = "mysql") Then
    _Connection = new MySqlConnection()
Else
    _Connection = new SqlClient.SqlConnection()
EndIf

By the way, I'd create an enum for the database types.