第一步，在ModConString模块中定义一系列变量

'定义一个属性过程反映连接字符串

Public Property Get conString() As Variant
    conString =  "data source=.;initial catalog=Sims_four;user 
End  Property

'定义一个提供者反映数据库类型

Public Property Get conProvide() As  Variant
    conProvide = "sqloledb"
End Property

第二步，建立一个类OpenRs.cls

Option Explicit
Private cnSIMS As ADODB.Connection                  '声明一个连接
Private rsSims As ADODB.Recordset                  '声明一个连接记录集
Public rs1 As ADODB.Recordset                      '声明一个连接到所需表的记录集
Public  rs2 As ADODB.Recordset
Public rst As ADODB.Recordset
Private Data As  Object
'---------------------------------------------------------
'  在类初始化时建立连接
'---------------------------------------------------------
Private  Sub Class_Initialize()
    On Error GoTo DbnotOpen
    Set cnSIMS = New  ADODB.Connection
    With cnSIMS
        .Provider = conProvide
        .ConnectionString = conString
        .ConnectionTimeout = 10
        .Open
        Set rst = New ADODB.Recordset
    End With
    Exit  Sub
DbnotOpen:
    If Err = -2147467259 Then
        Set cnSIMS =  Nothing
        MsgBox "连接后台数据库失败！" & vbCrLf & vbCrLf &  "请检查配置是否完好,数据库Sims_four是否存在?", vbOKOnly + vbInformation, "学生信息管理系统"
        End
    End If
End  Sub
'---------------------------------------------------------
'data是一个指向ADO记录集的对象的引用
'用于设置class的数据源内容
'---------------------------------------------------------
Private  Sub Class_GetDataMember(DataMember As String, Data As Object)
    Set Data =  rsSims
End Sub
'-------------------------------------------------------
'建立一个可以打开记录集的函数，需要是必须把表名传给函数
'-------------------------------------------------------
Public  Function rsDK(Table As String)
    Set rsSims = New ADODB.Recordset
    With rsSims
        .Source = Table
        .ActiveConnection = cnSIMS
        .CursorType = adOpenKeyset
        .LockType = adLockOptimistic
        .Open , ,  , , adCmdTable
    End With
End  Function
'-------------------------------------------------------
'建立一个可以打开记录集(动态游标)的函数
'需要把SQL语句传递给函数
'-------------------------------------------------------
Public  Function rsDK1(sql As String)
    Set rs1 = New ADODB.Recordset
    With  rs1
        .Source = sql
        .ActiveConnection = cnSIMS
        .CursorType =  adOpenKeyset
        .LockType = adLockOptimistic
        .Open , , , ,  adCmdText
    End With
End  Function
'-------------------------------------------------------
'建立一个可以打开记录集(静态游标)的函数
'需要把SQL语句传递给函数
'-------------------------------------------------------
Public  Function rsDK2(sql As String)
    Set rs2 = New ADODB.Recordset
    With  rs2
        .Source = sql
        .ActiveConnection = cnSIMS
        .CursorType =  adOpenStatic
        .LockType = adLockOptimistic
        .Open , , , ,  adCmdText
    End With
End  Function
'-------------------------------------------------------
'类终止时,释放一切可能占据的资源
'-------------------------------------------------------
Private  Sub Class_Terminate()
    Set cnSIMS = Nothing
    Set rs1 =  Nothing
    Set rs2 = Nothing
    Set rsSims = Nothing
    Set rst =  Nothing
End Sub

第三步，在窗体中使用这个类

Option Explicit
Dim myModiStudent As OpenRs   '声明连接数据库的类
Private Sub  Form_Load()
    Set myModiStudent = New OpenRs
    myModiStudent.rsDK1 "SELECT *  FROM student_info" ’打开表，红字是表名
    If Not  myModiStudent.rs1.EOF Then
        Set StudentGrid.DataSource = myModiStudent.rs1  ’这里用到了MSHFlexGrid 控件
    End If
End Sub

OK，成功拉。