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用代码创建 DSN(SQL Server ODBC)[转帖]

1970-1-1 08:00| 发布者: A.S. Karre| 查看: 3107| 评论: 0

正文：

这里是我分发程序中的一些代码。通常应用程序需要通过ODBC连接SQL Server数据库，因此要为链接表创建系统的DSN。该程序将在未发现现在的ODBC时创建一个新的系统的DSN。

'*********************** Code Start ***************************
'
Const JDS_DSN_name = "MDTS"             ' DSN的名字
Const JDS_Server_name = "148.154.61.15" ' 服务器名，这里给出的服务器的IP地址，
                                       ' 也可以通过域名解析给出域名

' 定义注册表API函数
Private Declare Function RegEnumKeyEx Lib "advapi32.dll" _
Alias "RegEnumKeyExA" _
  (ByVal hKey As Long, _
ByVal dwIndex As Long, _
ByVal lpName As String, _
lpcbName As Long, _
ByVal lpReserved As Long, _
ByVal lpClass As String, _
lpcbClass As Long, _
ByVal lpftLastWriteTime As String) As Long

Private Declare Function RegOpenKeyEx Lib "advapi32.dll" _
Alias "RegOpenKeyExA" _
(ByVal hKey As Long, _
ByVal lpSubKey As String, _
ByVal ulOptions As Long, _
ByVal samDesired As Long, phkResult As Long) As Long

Private Declare Function RegCloseKey Lib "advapi32.dll" _
(ByVal hKey As Long) As Long

Const HKEY_LOCAL_MACHINE = &H80000002

Const ERROR_SUCCESS = 0&
Const SYNCHRONIZE = &H100000
Const STANDARD_RIGHTS_READ = &H20000
Const STANDARD_RIGHTS_WRITE = &H20000
Const STANDARD_RIGHTS_EXECUTE = &H20000
Const STANDARD_RIGHTS_REQUIRED = &HF0000
Const STANDARD_RIGHTS_ALL = &H1F0000
Const KEY_QUERY_value = &H1
Const KEY_SET_value = &H2
Const KEY_CREATE_SUB_KEY = &H4
Const KEY_ENUMERATE_SUB_KEYS = &H8
Const KEY_NOTIFY = &H10
Const KEY_CREATE_LINK = &H20
Const KEY_READ = ((STANDARD_RIGHTS_READ Or _
               KEY_QUERY_value Or _
               KEY_ENUMERATE_SUB_KEYS Or _
               KEY_NOTIFY) And _
               (Not SYNCHRONIZE))

Const REG_DWORD = 4
Const REG_BINARY = 3
Const REG_SZ = 1

Const ODBC_ADD_SYS_DSN = 4

Private Declare Function SQLConfigDataSource Lib "odbccp32.dll" _
(ByVal hwndParent As Long, _
ByVal fRequest As Integer, _
ByVal lpszDriver As String, _
ByVal lpszAttributes As String) As Long

Function Check_SDSN()

' 查看我们要的系统数据源(DSN)是否存在。
' 如果存在，正好；否则，我们就创建一个。

Dim lngKeyHandle As Long
Dim lngResult As Long
Dim lngCurIdx As Long
Dim strvalue As String
Dim classvalue As String
Dim timevalue As String
Dim lngvalueLen As Long
Dim classlngvalueLen As Long
Dim lngData As Long
Dim lngDataLen As Long
Dim strResult As String
Dim DSNfound As Long
Dim syscmdresult As Long

syscmdresult = SysCmd(acSysCmdSetStatus, "查找系统DSN: " & JDS_DSN_name & " …")

' 打开包含系统数据源(DSN)的注册表主键。

lngResult = RegOpenKeyEx(HKEY_LOCAL_MACHINE, _
                           "SOFTWARE\ODBC\ODBC.INI", _
                           0&, _
                           KEY_READ, _
                           lngKeyHandle)

If lngResult <> ERROR_SUCCESS Then
      MsgBox "错误: 不能打开注册键 HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBC.INI." & _
            vbCrLf & vbCrLf & _
            "请安装SQL Server的ODBC驱动程序用以调用MDTS系统数据源。" & _
            vbCrLf & _
            "要获得更多的信息，请与管理员联系。"
      syscmdresult = SysCmd(acSysCmdClearStatus)
      Check_SDSN = -1
End If

' 现在这个注册键是打开的，我们在这个查找看是否我们需要的。

lngCurIdx = 0
DSNfound = False

Do
      lngvalueLen = 512
      classlngvalueLen = 512
      strvalue = String(lngvalueLen, 0)
      classvalue = String(classlngvalueLen, 0)
      timevalue = String(lngvalueLen, 0)
      lngDataLen = 512

      lngResult = RegEnumKeyEx(lngKeyHandle, _
                              lngCurIdx, _
                              strvalue, _
                              lngvalueLen, _
                              0&, _
                              classvalue, _
                              classlngvalueLen, _
                              timevalue)
      lngCurIdx = lngCurIdx + 1

      If lngResult = ERROR_SUCCESS Then

         ' 是我们要的系统数据源吗?

         If strvalue = JDS_DSN_name Then

            ' 是! 那就不需要我们再做什么了。

            DSNfound = True
            syscmdresult = SysCmd(acSysCmdClearStatus)

         End If

      End If

Loop While lngResult = ERROR_SUCCESS And Not DSNfound

Call RegCloseKey(lngKeyHandle)

If Not DSNfound Then

      ' 我们所需的系统数据源不存在，因此，我们试着创建一个。

      Syscmdresult = SysCmd(acSysCmdSetStatus, "创建系统数据源DSN: " & JDS_DSN_name & "…")

      lngResult = SQLConfigDataSource(0, _
                                    ODBC_ADD_SYS_DSN, _
                                    "SQL Server", _
                                    "DSN=" & JDS_DSN_name & Chr(0) & _
                                    "Server=" & JDS_Server_name & Chr(0) & _
                                    "Database=SvCvMarketing" & Chr(0) & _
                                    "UseProcForPrepare=Yes" & Chr(0) & _
                                    "Description=MDTS Database" & Chr(0) & Chr(0))

      If lngResult = False Then

         MsgBox "错误: 不能创建系统数据源DSN: " & JDS_DSN_name & "." & _
                  vbCrLf & vbCrLf & _
                  "请确认已安装了SQL Server的ODBC驱动程序。" & _
                  vbCrLf & _
                  "需要更的有关MDTS的信息，请与系统管理员联系。"

         syscmdresult = SysCmd(acSysCmdClearStatus)
         Check_SDSN = -1

      End If

End If

syscmdresult = SysCmd(acSysCmdClearStatus)
Check_SDSN = 0

End Function

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用代码创建 DSN(SQL Server ODBC)[转帖]

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