' Windows Installer utility to add a transform or nested database as a substorage
' For use with Windows Scripting Host, CScript.exe or WScript.exe
' Copyright (c) Microsoft Corporation. All rights reserved.
' Demonstrates the use of the database _Storages table
'
Option Explicit

Const msiOpenDatabaseModeReadOnly     = 0
Const msiOpenDatabaseModeTransact     = 1
Const msiOpenDatabaseModeCreate       = 3

Const msiViewModifyInsert         = 1
Const msiViewModifyUpdate         = 2
Const msiViewModifyAssign         = 3
Const msiViewModifyReplace        = 4
Const msiViewModifyDelete         = 6

Const ForAppending = 8
Const ForReading = 1
Const ForWriting = 2
Const TristateTrue = -1

' Check arg count, and display help if argument not present or contains ?
Dim argCount:argCount = Wscript.Arguments.Count
If argCount > 0 Then If InStr(1, Wscript.Arguments(0), "?", vbTextCompare) > 0 Then argCount = 0
If (argCount = 0) Then
	Wscript.Echo "Windows Installer database substorage management utility" &_
		vbNewLine & " 1st argument is the path to MSI database (installer package)" &_
		vbNewLine & " 2nd argument is the path to a transform or database to import" &_
		vbNewLine & " If the 2nd argument is missing, substorages will be listed" &_
		vbNewLine & " 3rd argument is optional, the name used for the substorage" &_
		vbNewLine & " If the 3rd argument is missing, the file name is used" &_
		vbNewLine & " To remove a substorage, use /D or -D as the 2nd argument" &_
		vbNewLine & " followed by the name of the substorage to remove" &_
		vbNewLine &_
		vbNewLine & "Copyright (C) Microsoft Corporation.  All rights reserved."
	Wscript.Quit 1
End If

' Connect to Windows Installer object
On Error Resume Next
Dim installer : Set installer = Nothing
Set installer = Wscript.CreateObject("WindowsInstaller.Installer") : CheckError

' Evaluate command-line arguments and set open and update modes
Dim databasePath:databasePath = Wscript.Arguments(0)
Dim openMode    : If argCount = 1 Then openMode = msiOpenDatabaseModeReadOnly Else openMode = msiOpenDatabaseModeTransact
Dim updateMode  : If argCount > 1 Then updateMode = msiViewModifyAssign  'Either insert or replace existing row
Dim importPath  : If argCount > 1 Then importPath = Wscript.Arguments(1)
Dim storageName : If argCount > 2 Then storageName = Wscript.Arguments(2)
If storageName = Empty And importPath <> Empty Then storageName = Right(importPath, Len(importPath) - InStrRev(importPath, "\",-1,vbTextCompare))
If UCase(importPath) = "/D" Or UCase(importPath) = "-D" Then updateMode = msiViewModifyDelete : importPath = Empty 'substorage will be deleted if no input data

' Open database and create a view on the _Storages table
Dim sqlQuery : Select Case updateMode
	Case msiOpenDatabaseModeReadOnly: sqlQuery = "SELECT `Name` FROM _Storages"
	Case msiViewModifyAssign:         sqlQuery = "SELECT `Name`,`Data` FROM _Storages"
	Case msiViewModifyDelete:         sqlQuery = "SELECT `Name` FROM _Storages WHERE `Name` = ?"
End Select
Dim database : Set database = installer.OpenDatabase(databasePath, openMode) : CheckError
Dim view     : Set view = database.OpenView(sqlQuery)
Dim record

If openMode = msiOpenDatabaseModeReadOnly Then 'If listing storages, simply fetch all records
	Dim message, name
	view.Execute : CheckError
	Do
		Set record = view.Fetch
		If record Is Nothing Then Exit Do
		name = record.StringData(1)
		If message = Empty Then message = name Else message = message & vbNewLine & name
	Loop
	Wscript.Echo message
Else 'If adding a storage, insert a row, else if removing a storage, delete the row
	Set record = installer.CreateRecord(2)
	record.StringData(1) = storageName
	view.Execute record : CheckError
	If importPath <> Empty Then  'Insert storage - copy data into stream
		record.SetStream 2, importPath : CheckError
	Else  'Delete storage, fetch first to provide better error message if missing
		Set record = view.Fetch
		If record Is Nothing Then Wscript.Echo "Storage not present:", storageName : Wscript.Quit 2
	End If
	view.Modify updateMode, record : CheckError
	database.Commit : CheckError
	Set view = Nothing
	Set database = Nothing
	CheckError
End If

Sub CheckError
	Dim message, errRec
	If Err = 0 Then Exit Sub
	message = Err.Source & " " & Hex(Err) & ": " & Err.Description
	If Not installer Is Nothing Then
		Set errRec = installer.LastErrorRecord
		If Not errRec Is Nothing Then message = message & vbNewLine & errRec.FormatText
	End If
	Wscript.Echo message
	Wscript.Quit 2
End Sub