How to create SQL CE 3.5 and 4.0 databases in one app

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What is a way to create SQL Server Compact 3.5 and 4.0 databases in a one application?

The code to create database is simple:

VB

Imports System.Data.SqlServerCe

Friend Function CreateDatabase(ByVal connectionString As String) As Boolean

    Dim engine As SqlCeEngine = Nothing
    Try
        engine = New SqlCeEngine
        engine.LocalConnectionString = connectionString
        engine.CreateDatabase()
        Return True
    Catch ex As SqlCeException
        MsgBox(ex.Message, MsgBoxStyle.Critical)
        Return False
    Finally
        If engine IsNot Nothing Then engine.Dispose()
    End Try

End Function

But it allows creating databases only for one version.

Posted 5-Dec-13 3:52am

Sergey Vaselenko

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Comments

joshrduncan2012 5-Dec-13 10:02am

Why do you want to have Versions 3.5 and 4.0 in the same application?

Sergey Vaselenko 5-Dec-13 10:49am

Yes. I need have a wizard to create databases of different versions.

joshrduncan2012 5-Dec-13 10:53am

Why do you want to? I doubt Visual Studio will let you have more than 1 database file of different versions in the same application.

Sergey Vaselenko 5-Dec-13 10:59am

Our Excel add-in allows working with 3.5 and 4.0. And I want to have the wizard to create both version databases.

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Sergey Vaselenko · Accepted Answer · 2013-12-05T05:33:00

I've solved the task.

The new function code:

VB

Imports System.Reflection
Imports System.Data.Common

Friend Function CreateDatabase(ByVal factory As DbProviderFactory, ByVal connectionString As String) As Boolean

    Dim asm As Assembly = Assembly.Load(factory.GetType.Assembly.FullName)
    Dim t As Type = asm.GetType("System.Data.SqlServerCe.SqlCeEngine")

    Dim engine = Nothing
    Try
        engine = Activator.CreateInstance(t)
        engine.LocalConnectionString = connectionString
        engine.CreateDatabase()
        Return True
    Catch ex As SystemException
        MsgBox(ex.Message, MsgBoxStyle.Critical)
        Return False
    Finally
        If engine IsNot Nothing Then engine.Dispose()
    End Try

End Function

Usage:

VB

Dim factory As DbProviderFactory
Dim connectionString As String

factory = DbProviderFactories.GetFactory("System.Data.SqlServerCe.4.0")
connectionString = "Data Source=test40.sdf;"

CreateDatabase(factory, connectionString)

factory = DbProviderFactories.GetFactory("System.Data.SqlServerCe.3.5")
connectionString = "Data Source=test35.sdf;"

CreateDatabase(factory, connectionString)