Ok, i don't know if it will be useful but i want to share. Modos and admin will delete if they want.
I'm developping a VB application (actually, i migrate one from Excel VBA) to interact with MySQL Database. I use VS 2019 16.8.2, Windows 7 x64.
I got a cryptic issue during connection to the database (using ADO, reference used: MS ADO 2.6). Here's the code:
Public Sub test_connect() Dim server_name As String Dim database_name As String Dim login_database As String Dim port_number As String Dim pwd_database As String server_name = "my_server" database_name = "my_database" login_database = "whoisyourdaddy" pwd_database = "youare" connexion_dlweb_doc = New ADODB.Connection With { .ConnectionString = "DRIVER={MySQL ODBC 8.0 ANSI Driver};" _ & "SERVER=" & server_name & "; " _ & "PORT=" & port_number & "; " _ & "DATABASE=" & database_name & "; " _ & "UID=" & login_database & "; " _ & "PWD=" & pwd_database & "; " _ & "OPTION=3" } If connexion_dlweb_doc.State <> adStateOpen Then connexion_dlweb_doc.Open() End If End Sub So, i got an exception with the " connexion_dlweb_doc = New ADODB.Connection" command. It's where it becomes cryptic: System.TypeInitializationException : 'The type initializer for 'MyAPP.mod_declaration_variables' threw an exception.' COMException : Retrieving the COM class factory for component with CLSID {00020819-0000-0000-C000-000000000046} failed due to the following error: 80040154 Classe non enregistrée (0x80040154 (REGDB_E_CLASSNOTREG)).
mod_declaration_variables is a module where i declare global variables like connexion_dlweb_doc:
Public connexion_dlweb_doc As ADODB.Connection So, i asked my best friend google about this cryptic message and the CLSID {00020819-0000-0000-C000-000000000046} refer to...Microsoft.Interop.Excel 14.0.0.0 I use the reference MS Excel Objet Library 14.0 in my project. How did this interact with the ADO connection part? What's the link? Why the code crash here and not before? I don't know why but the solution was to delete (or comment) every variable declaration using Excel library, e.g: Public xlApp_arbo_wiki As Excel.Application
Guess it would help noobs like me.
