How to add Failover Partner to a connection string in VB.NET

Question

I have a windows application connecting to Database to read some data. Since the database is setup for resilience, my application needs to connect to one of the two database

Answer 1

If you do not have mirroring set up between SQL servers, you can achieve this by using .net. simply in a catch statement.

Code below..

enter code here
Imports System.Data.SqlClient
Imports System.Data

Public Class dbConn
Private primaryServerLocation As String = "SERVER=primaryAddress;DATABASE=yourDB;User id=youruserID;Password=yourPassword;"
Private secondaryServerLocation As String = "SERVER=secondaryAddress;DATABASE=yourDB;User id=youruserID;Password=yourPassword;"


Public sqlConnection As SqlConnection
Public cmd As SqlCommand

Public Sub primaryConnection()
    Try
        sqlConnection = New System.Data.SqlClient.SqlConnection(primaryServerLocation)
        cmd = New System.Data.SqlClient.SqlCommand()

        'test connection
        sqlConnection.Open()
        sqlConnection.Close()
    Catch ex As Exception
        secondaryConnection()
    End Try
End Sub

Public Sub secondaryConnection()
    'Used as the failover secondary server if primary is down.
    Try
        sqlConnection = New System.Data.SqlClient.SqlConnection(secondaryServerLocation)
        cmd = New System.Data.SqlClient.SqlCommand()

        'test connection
        sqlConnection.Open()
        sqlConnection.Close()
    Catch ex As Exception
    End Try
End Sub
End Class