VERSION 1.0 CLASS
BEGIN
  MultiUse = -1  'True
  Persistable = 0  'NotPersistable
  DataBindingBehavior = 0  'vbNone
  DataSourceBehavior  = 0  'vbNone
  MTSTransactionMode  = 0  'NotAnMTSObject
END
Attribute VB_Name = "ClsDB"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Option Explicit
'數據庫連接
Public conn As New ADODB.Connection

'表明當前數據庫的連接狀態:False－未連接；True－已連接
Public dbStatus As Boolean


Public Function openDB() As Boolean
   
    On Error GoTo errHandler
    
    conn.Open sqlstring
    
    '如果出現連接錯誤
'    MsgBox Err.Description: GoTo errHandler
    If Err.Number <> 0 Then
      openDB = False
    Else
      openDB = True
    Exit Function
End If
errHandler:
    openDB = False
    
End Function

Public Function closeDB() As Integer
    conn.Close

    dbStatus = False
End Function


Public Function ExecuteSQL(ByVal sql As String, MsgString As String) As ADODB.Recordset
'executes SQL and returns Recordset
   Dim cnn As ADODB.Connection
   Dim rst As ADODB.Recordset
   Dim sTokens() As String
   
   On Error GoTo ExecuteSQL_Error
   
   sTokens = Split(sql)
   Set cnn = New ADODB.Connection
   cnn.Open sqlstring
   If InStr("INSERT,DELETE,UPDATE", UCase$(sTokens(0))) Then
      cnn.Execute sql
      MsgString = sTokens(0) & " query successful"
   Else
      Set rst = New ADODB.Recordset
      rst.Open Trim$(sql), cnn, adOpenKeyset, adLockOptimistic
      'rst.MoveLast     'get RecordCount
      Set ExecuteSQL = rst
      MsgString = "查詢到" & rst.RecordCount & " 條記錄 "
   End If
ExecuteSQL_Exit:
   Set rst = Nothing
   Set cnn = Nothing
   Exit Function
   
ExecuteSQL_Error:
   MsgString = "查詢錯誤: " & Err.Description
   Resume ExecuteSQL_Exit
End Function