openrs_cls.cls

学生管理系统,vb+acc开发的一个简单程序

VERSION 1.0 CLASS
BEGIN
  MultiUse = -1  'True
  Persistable = 0  'NotPersistable
  DataBindingBehavior = 0  'vbNone
  DataSourceBehavior  = 1  'vbDataSource
  MTSTransactionMode  = 0  'NotAnMTSObject
END
Attribute VB_Name = "OpenRs"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
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