Option Compare Database
Option Explicit
Dim adp_UseIntegratedSecurity As Boolean
Public Function fStartUp(strDBName As String, strMDFName As String, _
Optional strUN As String, Optional strPW As String)
'------------------------------------------------------------
'The code in this project connects the MDF file
'to a local MSDE, then establishes the connection between
'the Access Project and MSDE.
'------------------------------------------------------------
Dim strSQLInstances As String
Dim strServername As String
Dim intInst As Integer
Dim strMachineName As String
Dim spaceLocation As Long
'If no username is supplied, and you cannot
'use integrated security, the function requires that you provide a valid SQL Server user account and password.
If Not fCheckForCompatibleOS Then
strMachineName = "(local)"
If strUN = "" Then
MsgBox "Provide a valid SQL Server user account and password to log on to SQL Server because the current operating system does not support integrated security."
Exit Function
End If
adp_UseIntegratedSecurity = False
Else
strMachineName = ComputerName
If strUN = "" Then
adp_UseIntegratedSecurity = True
Else
adp_UseIntegratedSecurity = False
End If
End If
'Find the available instances of SQL 2000 on the computer.
intInst = GetValidSQLInstances(strSQLInstances)
If intInst < 1 Then
Dim strErrorMsg As String
strErrorMsg = "This application requires SQL Server 2000 " & _
"to be installed on the local computer."
MsgBox strErrorMsg, vbCritical, "SQL Server 2000 not installed!"
Exit Function
End If
'At this point, it has been determined that there is at
'least one valid SQL Server 2000 instance on the computer.
'The code below picks the default or first instance if more than
'one is available. You may want to add code to prompt the user for
'a choice when there is more than one instance on the computer.
If InStr(1, strSQLInstances, "MSSQLSERVER") Then
strServername = strMachineName
Else
spaceLocation = InStr(1, strSQLInstances, " ")
If spaceLocation = 0 Then
strServername = strMachineName & "\" & strSQLInstances
Else
strServername = strMachineName & "\" & Mid(strSQLInstances, 1, spaceLocation)
End If
End If
'Call fstartMSDE to connect to SQL Server
fStartMSDE strServername, strUN, strPW
'Call sCopyMDF to move the data file to the data folder
'of SQL Server, and then attach it to the server.
fCopyMDF strServername, strUN, strPW, strDBName, strMDFName
'Connect the ADP to the new database
fChangeADPConnection strServername, strDBName, strUN, strPW
End Function
Public Function fStartMSDE(strServername As String, _
Optional strUN As String, Optional strPW As String)
'------------------------------------------------------------
'This subroutine will turn on MSDE. If the server has been
'started, the error trap will exit the function leaving the
'server running.
'
'Note that it will not put the SQL Service Manager on
'the start bar.
'
'Input:
' strServername The server to be started
' strUN The user used to start server
' strPW The password of user
'
'Output:
' Resolution of start
'
'References:
' SQLDMO
'------------------------------------------------------------
Dim osvr As SQLDMO.SQLServer
Set osvr = CreateObject("SQLDMO.SQLServer")
On Error GoTo StartError 'Error Trap
osvr.LoginTimeout = 60
osvr.LoginSecure = adp_UseIntegratedSecurity
osvr.Start True, strServername, strUN, strPW
ExitSub:
Set osvr = Nothing
Exit Function
StartError:
If Err.Number = -2147023840 Then
'This error is thrown when the server is already running,
'and Server.Start is executed on Windows NT, 2000, or XP.
osvr.Connect strServername, strUN, strPW 'Connect to Server
Else 'Unknown Error
MsgBox Err.Number & ": " & Err.Description
End If
Resume ExitSub
End Function
Public Function fCopyMDF(strServername As String, _
strUN As String, strPW As String, _
strDBName As String, _
sMDFName As String)
'------------------------------------------------------------
'This Function determines whether the database is already on
'the MSDE Server. If the database does not exist, this
'function copies the MDF file from the same location as the
'ADP to MSDE's Data directory and then attaches the database.
'
'Input:
' strServername The server to be started
' strUN The user used to start server
' strPW The password of user
' strDBName The Name of the SQL Database
' sMDFName The Name of the MSDE Database to be copied
'
'Output:
' Resolution of copy
'
'References:
' SQLDMO
' Scripting Runtime
'------------------------------------------------------------
Dim FSO As Scripting.FileSystemObject
Dim osvr As SQLDMO.SQLServer
Dim strMessage As String
Dim db As Variant
Dim fDataBaseFlag As Boolean
Dim dbCount As Integer
On Error GoTo sCopyMDFTrap
'The drive names used in FSO.Copyfile and
'oSvr.AttachDBWithSingleFile must match the
'locations for Program Files and MSDE on the
'computer of the end user.
fCopyMDF = ""
fDataBaseFlag = False
Set FSO = CreateObject("Scripting.FileSystemObject")
Set osvr = CreateObject("SQLDMO.SQLServer")
osvr.LoginSecure = adp_UseIntegratedSecurity
osvr.Connect strServername, strUN, strPW
dbCount = osvr.Databases.Count
'Look for database existence on Local MSDE Server
'by looping through all database names on the local
'MSDE Server.
For Each db In osvr.Databases
If db.Name = strDBName Then 'The database exists
fDataBaseFlag = True
Exit For 'Get out of loop
End If
Next
If Not fDataBaseFlag Then 'There is no database
'matching sDBName
'Copy File to data folder.
FSO.CopyFile Application.CurrentProject.Path _
& "\" & sMDFName, _
osvr.Databases("master").PrimaryFilePath & _
sMDFName, True
'Attach to database.
strMessage = osvr.AttachDBWithSingleFile(strDBName, _
osvr.Databases("master").PrimaryFilePath _
& sMDFName)
End If
ExitCopyMDF:
osvr.Disconnect
Set osvr = Nothing
Exit Function
sCopyMDFTrap:
If Err.Number = -2147216399 Then 'DMO must be initialized
Resume Next
Else
MsgBox Err.Description
End If
Resume ExitCopyMDF
Exit Function
End Function
Function MakeADPConnectionless()
'------------------------------------------------------------
'This code removes the connection properties from the
'Access Project for troubleshooting purposes.
'The ADP will open in a disconnected state until new connection
'properties are supplied.
'------------------------------------------------------------
Application.CurrentProject.OpenConnection ""
End Function
Function fChangeADPConnection(strServername, strDBName As String, Optional strUN As String, _
Optional strPW As String) As Boolean
'------------------------------------------------------------
'This Function resets the connection for an ADP by using the
'input parameters to create a new connection string. If no username
'is supplied, it tries to connect by using integrated security.
'
'Input:
' strServerName The server to be started
' strDBName The Name of the MSDE Database
' strUN The user used to start server
' strPW The password of user
'------------------------------------------------------------
Dim strConnect As String
On Error GoTo EH:
strConnect = "Provider=SQLOLEDB.1" & _
";Data Source=" & strServername & _
";Initial Catalog=" & strDBName
If adp_UseIntegratedSecurity Then
strConnect = strConnect & ";integrated security=SSPI"
Else
strConnect = strConnect & ";user id=" & strUN
strConnect = strConnect & ";password=" & strPW
End If
Application.CurrentProject.OpenConnection strConnect
fChangeADPConnection = True
Exit Function
EH:
MsgBox Err.Number & ": " & Err.Description, vbCritical, "Connection Error"
fChangeADPConnection = False
End Function
Option Compare Database
Option Explicit
'This module provides functions that work together to
'find existing computers running SQL Servers, and also the computer name.
Public Type OSVERSIONINFO
dwOSVersionInfoSize As Long
dwMajorVersion As Long
dwMinorVersion As Long
dwBuildNumber As Long
dwPlatformId As Long
szCSDVersion As String * 128
End Type
Declare Function GetVersionExA Lib "kernel32" _
(lpVersionInformation As OSVERSIONINFO) As Integer
Private Declare Function OSRegOpenKey Lib "advapi32" Alias _
"RegOpenKeyA" (ByVal hKey As Long, ByVal lpszSubKey As String, _
phkResult As Long) As Long
Private Declare Function OSRegQueryValueEx Lib "advapi32" _
Alias "RegQueryValueExA" (ByVal hKey As Long, _
ByVal lpszValueName As String, ByVal dwReserved As Long, _
lpdwType As Long, lpbData As Any, cbData As Long) As Long
Private Declare Function GetComputerName _
Lib "kernel32" Alias _
"GetComputerNameA" (ByVal lpBuffer As String, _
nSize As Long) As Long
Private Declare Function OSRegCloseKey Lib "advapi32" _
Alias "RegCloseKey" (ByVal hKey As Long) As Long
Private Const MAX_COMPUTERNAME_LENGTH As Long = 15&
Public Const HKEY_CLASSES_ROOT = &H80000000
Public Const HKEY_CURRENT_USER = &H80000001
Public Const HKEY_LOCAL_MACHINE = &H80000002
Public Const HKEY_USERS = &H80000003
Private Const ERROR_SUCCESS = 0&
Private Const VER_PLATFORM_WIN32s = 0 'Win32s on Windows 3.1
Private Const VER_PLATFORM_WIN32_WINDOWS = 1 'Windows 95/98/ME.
Private Const VER_PLATFORM_WIN32_NT = 2 'Windows NT/2000/XP
Private Const REG_SZ = 1
Private Const REG_BINARY = 3
Private Const REG_DWORD = 4
Private Const REG_MULTI_SZ = 7
Public Function GetValidSQLInstances(ByRef strSQLInstances _
As String) As Integer
'-----------------------------------------------------------
' This returns number of valid SQL instances and a space
' delimited string that lists the instances.
'-----------------------------------------------------------
Dim hKey As Long, i As Integer
Dim strVersionInfo As String
strSQLInstances = ""
GetValidSQLInstances = 0
If RegOpenKey(HKEY_LOCAL_MACHINE, _
"Software\Microsoft\Microsoft SQL Server", hKey) Then
RegQueryStringValue hKey, "InstalledInstances", strSQLInstances
RegCloseKey hKey
StrConv strSQLInstances, vbUpperCase
If InStr(1, strSQLInstances, "MSSQLSERVER") Then
If RegOpenKey(HKEY_LOCAL_MACHINE, _
"Software\Microsoft\MSSQLServer\MSSQLServer\CurrentVersion", _
hKey) Then
RegQueryStringValue hKey, "CurrentVersion", strVersionInfo
RegCloseKey hKey
If Mid(strVersionInfo, 1, 1) <> 8 Then
Replace strSQLInstances, "MSSQLSERVER", ""
End If
End If
End If
Trim strSQLInstances
If Len(strSQLInstances) > 0 Then
GetValidSQLInstances = GetValidSQLInstances + 1
Else
Exit Function
End If
For i = 1 To Len(strSQLInstances)
If Mid$(strSQLInstances, i, 1) = " " Then
GetValidSQLInstances = GetValidSQLInstances + 1
End If
Next i
End If
End Function
Public Function RegOpenKey(ByVal hKey As Long, _
ByVal lpszSubKey As String, phkResult As Long) As Boolean
'-----------------------------------------------------------
' FUNCTION: RegOpenKey
' Opens an existing key in the system registry.
' Returns: True, if the key opened successfully. False
' otherwise.
' Upon success, phkResult is set to the handle of the key.
'-----------------------------------------------------------
Dim lResult As Long
Dim strHkey As String
strHkey = strGetHKEYString(hKey)
lResult = OSRegOpenKey(hKey, lpszSubKey, phkResult)
If lResult = ERROR_SUCCESS Then
RegOpenKey = True
End If
End Function
Public Function RegCloseKey(ByVal hKey As Long) As Boolean
Dim lResult As Long
'-----------------------------------------------------------
' FUNCTION: RegCloseKey
' Closes an open registry key.
' Returns: True on success, else False.
'-----------------------------------------------------------
lResult = OSRegCloseKey(hKey)
RegCloseKey = (lResult = ERROR_SUCCESS)
End Function
Private Function strGetHKEYString(ByVal hKey As Long) As String
'-----------------------------------------------------------
'Given an HKEY, return the text string representing that key.
'-----------------------------------------------------------
Dim strKey As String
Dim intIdx As Integer
strKey = strGetPredefinedHKEYString(hKey)
If Len(strKey) > 0 Then
strGetHKEYString = strKey
Exit Function
End If
End Function
Private Function strGetPredefinedHKEYString(ByVal _
hKey As Long) As String
'-----------------------------------------------------------
'Given a predefined HKEY, return the text string representing
'that key, or else return vbNullString.
'-----------------------------------------------------------
Select Case hKey
Case HKEY_CLASSES_ROOT
strGetPredefinedHKEYString = "HKEY_CLASSES_ROOT"
Case HKEY_CURRENT_USER
strGetPredefinedHKEYString = "HKEY_CURRENT_USER"
Case HKEY_LOCAL_MACHINE
strGetPredefinedHKEYString = "HKEY_LOCAL_MACHINE"
Case HKEY_USERS
strGetPredefinedHKEYString = "HKEY_USERS"
End Select
End Function
Public Function RegQueryStringValue(ByVal hKey As Long, _
ByVal strValueName As String, strData As String) As Boolean
'-----------------------------------------------------------
' Retrieves the string data for a named
' (strValueName = name) or unnamed (Len(strValueName) = 0)
' value in a registry key. If the named value
' exists, but its data is not a string, this function
' fails.
'
' Returns: True on success, else False.
' On success, strData is set to the string data value.
'-----------------------------------------------------------
Dim lResult As Long
Dim lValueType As Long
Dim strBuf As String
Dim lDataBufSize As Long
lResult = OSRegQueryValueEx(hKey, strValueName, 0&, _
lValueType, _
ByVal 0&, lDataBufSize)
If lResult = ERROR_SUCCESS Then
If lValueType = REG_SZ Then
strBuf = space$(lDataBufSize)
lResult = OSRegQueryValueEx(hKey, strValueName, 0&, _
0&, ByVal strBuf, lDataBufSize)
If lResult = ERROR_SUCCESS Then
RegQueryStringValue = True
strData = StringFromBuffer(strBuf)
End If
ElseIf lValueType = REG_MULTI_SZ Then
strBuf = space$(lDataBufSize)
lResult = OSRegQueryValueEx(hKey, strValueName, 0&, _
0&, _
ByVal strBuf, lDataBufSize)
If lResult = ERROR_SUCCESS Then
RegQueryStringValue = True
strData = ReplaceNullsWithSpaces(strBuf)
End If
End If
End If
End Function
Public Function StringFromBuffer(Buffer As String) As String
Dim nPos As Long
nPos = InStr(Buffer, vbNullChar)
If nPos > 0 Then
StringFromBuffer = Left$(Buffer, nPos - 1)
Else
StringFromBuffer = Buffer
End If
End Function
Public Function ReplaceNullsWithSpaces(str As String) As String
'-----------------------------------------------------------
' Replace all null characters with spaces.
'-----------------------------------------------------------
Dim i As Integer
If Len(str) > 0 Then
For i = 1 To Len(str)
If Mid$(str, i, 1) = vbNullChar Then
Mid$(str, i, 1) = " "
End If
Next i
ReplaceNullsWithSpaces = Left$(str, Len(str) - 2)
Else
ReplaceNullsWithSpaces = str
End If
End Function
Public Function ComputerName() As String
'-----------------------------------------------------------
' Returns the local computer name.
'-----------------------------------------------------------
Dim nLen As Long
Dim strComputerName As String
nLen = MAX_COMPUTERNAME_LENGTH
strComputerName = String$(nLen, 0)
GetComputerName strComputerName, nLen
strComputerName = Left$(strComputerName, nLen)
ComputerName = strComputerName
End Function
Public Function fCheckForCompatibleOS() As Boolean
'-----------------------------------------------------------
' Checks to see if the OS can use integrated security.
'-----------------------------------------------------------
Dim osinfo As OSVERSIONINFO
Dim retvalue As Integer
osinfo.dwOSVersionInfoSize = 148
osinfo.szCSDVersion = space$(128)
retvalue = GetVersionExA(osinfo)
If osinfo.dwPlatformId >= VER_PLATFORM_WIN32_NT Then
fCheckForCompatibleOS = True
Else
fCheckForCompatibleOS = False
End If
End Function
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