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Function CreateClass1() As Boolean Dim cls As New clsTest Dim varResult As Variant MsgBox cls.ClassState, vbInformation, "Class Example" varResult = cls.AddInvoice("ALFKI") MsgBox cls.ClassState, vbInformation, "Class Example" Set cls = Nothing CreateClass1 = True End Function ¸ÃʾÀý£º н¨ clsTest Class ¶ÔÏóµÄʵÀý¡£ µ÷Óà Class ¶ÔÏóµÄ AddInvoice ·½·¨£¬²¢´«µÝÓÐЧµÄ Customer ID£¨¿Í»§ ID£©¡£ ͨ¹ý½« cls ¶ÔÏóÉèÖÃΪ Nothing À´Ð¶ÔØ Class ¶ÔÏó¡£ ÔÚÑùÀý´úÂëÖв¢²»ÄÜÇå³þµØ¿´µ½¸Ã´úÂëʵÏÖµÄϸ½Ú¡£ÀýÈ磬²»ÄÜÈ·¶¨´´½¨ Class ¶ÔÏóʱËù·¢ÉúµÄ²Ù×÷£¬Ò²²»ÄÜÈ·¶¨¹Ø±Õ¸ÃÀàʱ AddInvoice ·½·¨Ö´ÐеIJÙ×÷»òËù·¢ÉúµÄ²Ù×÷¡£Õâ¾ÍÊÇÀàÄ£¿é±à³Ì¼¼ÊõµÄÒªµã£»ÔÚµ÷Óà Class ¶ÔÏóʱ£¬¿ÉÒÔ½«Ëù·¢ÉúµÄ¸´ÔÓ²Ù×÷Òþ²ØÔÚºǫ́¡£ÃæÏòÀàµÄ±à³Ì¼¼ÊõÓкܶàÓŵ㣬½«ÔÚ±¾ÎÄÖÐÏêϸ˵Ã÷¡£ ´´½¨ÑùÀýÀàÄ£¿éºÍÖ§³Ö´úÂë ×¢ÒâÊÂÏִÐб¾ÎÄÖеIJ½Ö轫»áÐÞ¸ÄÑùÀýÊý¾Ý¿â Northwind.mdb¡£ÐèÒª±¸·Ý Northwind.mdb Îļþ£¬²¢ÔÚÊý¾Ý¿â±¸·ÝÉÏÖ´ÐÐÕâЩ²½Öè¡£
ÿ´Î´´½¨ Class ¶ÔÏóʱ£¬¾Í»áÔÚ¸ÃÀàÖз¢Éú¿É²¶»ñµÄ Initialize ʼþ£¬ËüÀàËÆÓÚ´°ÌåÖÐµÄ Open ʼþ¡£Initialize ʼþλÓÚÒª±àдÀàÒÔÖ´ÐвÙ×÷µÄµØ·½¡£¶ÔÓÚ C++ ³ÌÐòÔ±À´Ëµ£¬ËüÀàËÆÓÚ Constructor¡£ ÇëÖ´ÐÐÕâЩ²½Öè´´½¨ clsTest ÀàÄ£¿éʾÀý£º ´ò¿ªÑùÀýÊý¾Ý¿â Northwind.mdb¡£ ÔÚ²åÈë²Ëµ¥ÉÏ£¬µ¥»÷ÀàÄ£¿é¡£ ½«ÀàÄ£¿éÁí´æΪ clsTest¡£ ÔÚ¡°ÉùÃ÷¡±²¿·Ö¼üÈëÒÔÏÂÐУº Private This_ClassState As String Private This_frm As Form ÔÚÄ£¿é´°¿ÚµÄ¶ÔÏó¿òÖÐÑ¡ÔñÀà¡£ ³õʼ»¯ÊÇÔÚ¹ý³Ì¿òÖÐ×Ô¶¯Ñ¡ÔñµÄ¡£ Ìí¼ÓÒÔϳÌÐò£º Private Sub Class_Initialize() This_ClassState = "Initialized" End Sub Ìí¼ÓÏÂÁÐ×Ô¶¨ÒåÊôÐÔº¯Êý£º Public Property Get ClassState() As String ClassState = This_ClassState End Property clsTest µÄ Initialize ʼþÖеĴúÂëÉèÖÃÃûΪ ClassState µÄÖ»¶ÁÊôÐÔµÄĬÈÏÖµ¡£ClassState ½« Class ¶ÔÏóµÄµ±Ç°×´Ì¬·µ»Øµ½µ÷Ó÷½¡£¸Ã´úÂë²¢²»ÊÇΪÁËʹÓÃÄ¿µÄ£¬¶øÖ»ÊÇ˵Ã÷ÔÚʵʩÀàÄ£¿éʱ¿ÉÒÔʹÓõļ¼Êõ¡£
ÏÂÁгÌÐò˵Ã÷ÈçºÎ´Ó Class ¶ÔÏóÖмìË÷ ClassState ÊôÐÔ£º Function GetClass1State() As String Dim cls As New clsTest Dim varResult as String varResult = cls.ClassState Set cls = Nothing GetClass1State = varResult End Function ¸Ã³ÌÐò´Ó Class ¶ÔÏóÖзµ»Ø Initialized£¬ËµÃ÷µ±¼Æ»®ÀàµÄ½á¹û¹¦ÄÜʱҪʹÓõĸÅÄî¡£Äú¿ÉÒÔ¶¨ÒåÀàËùÖ´ÐеIJÙ×÷£¬´ËÍ⣬¿ÉÒÔ¿¼ÂÇÈçºÎÔÚÄúµÄÀàÖÐʵÏÖ½Ó¿Ú¡£ÕâÓëÉè¼Æ´°ÌåÒÔ±ã´ÓÃÀѧ½Ç¶ÈÓäÔÃÓû§µÄ¸ÅÄîÊÇÒ»ÑùµÄ£¬²»¹ýÔÚÕâÖÖÇé¿öÖУ¬Ä¿±ê¹ÛÖÚÊÇʹÓà Visual Basic for Applications ±à³ÌµÄÈËÔ±¡£ ´´½¨Ò»¸ö³ÌÐòÓÃ×÷ clsTest ÀàÄ£¿éµÄ AddInvoice ·½·¨¡£¸Ã´úÂëÀàËÆÓÚ±ê׼ģ¿éÖеĴúÂ룺 ÔÚ clsTest ÀàÄ£¿éÖд´½¨ÏÂÁгÌÐò£º Function AddInvoice(custID As String) As Boolean On Local Error GoTo AddInvoice_Err Dim Msg As String Dim lngOrderID As Long Dim varResult As Variant Set This_frm = Form_Orders This_frm.Modal = True This_frm.Visible = True DoCmd.GoToRecord acForm, This_frm.Name, acNewRec This_frm.CustomerID = custID varResult = This_frm.SetShipTo This_ClassState = "RecordActive=" & CStr(This_frm.OrderID) AddInvoice = True AddInvoice_End: Exit Function AddInvoice_Err: Msg = "Error #: " & Format$(Err.Number) & vbCrLf Msg = Msg & Err.Description Err.Raise vbObjectError, "clsTest.AddInvoice", Msg Resume AddInvoice_End End Function ¸Ã³ÌÐòʹÓüòµ¥±à³Ì¼¼Êõ´ò¿ª¡°¶©µ¥¡±´°Ì壬Ìí¼ÓмǼ²¢ÏÔʾ¼Ç¼½øÐб༡£Ê¹ÓÃÊý¾Ý·ÃÎʶÔÏó (DAO) ʱ£¬ÓÐÐí¶à¿ÉÒÔÓÃÓڸôúÂëµÄÔöÇ¿¹¦ÄÜ¡£ÀýÈ磬Äú¿ÉÒÔÐ޸ĴúÂëÀ´¼ìË÷¿Í»§µÄ×îºó¶©µ¥²¢¸´ÖÆËü£¬¶ø²»Óôò¿ª¡°¶©µ¥¡±´°Ì塣ΪÁË˵Ã÷Ä¿µÄ£¬±¾Ê¾ÀýʹÓô°Ìå±¾ÉíÀ´Ìí¼ÓмǼ¡£ ×¢Ò⣺´íÎó´¦ÀíʼþʹÓà Err ¶ÔÏóµÄ Raise ·½·¨¡£¸Ã²Ù×÷ÔÊÐíÀàµÄµ÷Ó÷½£¨¶ø²»ÊÇÓû§£©À´´¦ÀíÈκδíÎó¡£ ¸Ã³ÌÐòʹÓüòµ¥±à³Ì¼¼Êõ´ò¿ª¡°¶©µ¥¡±´°Ì壬Ìí¼ÓмǼ²¢ÏÔʾ¼Ç¼½øÐб༡£Ê¹ÓÃÊý¾Ý·ÃÎʶÔÏó (DAO) ʱ£¬ÓÐÐí¶à¿ÉÒÔÓÃÓڸôúÂëµÄÔöÇ¿¹¦ÄÜ¡£ÀýÈ磬Äú¿ÉÒÔÐ޸ĴúÂëÀ´¼ìË÷¿Í»§µÄ×îºó¶©µ¥²¢¸´ÖÆËü£¬¶ø²»Óôò¿ª¡°¶©µ¥¡±´°Ì塣ΪÁË˵Ã÷Ä¿µÄ£¬±¾Ê¾ÀýʹÓô°Ìå±¾ÉíÀ´Ìí¼ÓмǼ¡£ ±£´æ²¢¹Ø±Õ clsTest ÀàÄ£¿é¡£ ¸Ã³ÌÐòʹÓüòµ¥±à³Ì¼¼Êõ´ò¿ª¡°¶©µ¥¡±´°Ì壬Ìí¼ÓмǼ²¢ÏÔʾ¼Ç¼½øÐб༡£Ê¹ÓÃÊý¾Ý·ÃÎʶÔÏó (DAO) ʱ£¬ÓÐÐí¶à¿ÉÒÔÓÃÓڸôúÂëµÄÔöÇ¿¹¦ÄÜ¡£ÀýÈ磬Äú¿ÉÒÔÐ޸ĴúÂëÀ´¼ìË÷¿Í»§µÄ×îºó¶©µ¥²¢¸´ÖÆËü£¬¶ø²»Óôò¿ª¡°¶©µ¥¡±´°Ì塣ΪÁË˵Ã÷Ä¿µÄ£¬±¾Ê¾ÀýʹÓô°Ìå±¾ÉíÀ´Ìí¼ÓмǼ¡£ ÔÚ¡°Éè¼Æ¡±ÊÓͼÖдò¿ª¡°¶©µ¥¡±´°Ìå¡£ ¸Ã³ÌÐòʹÓüòµ¥±à³Ì¼¼Êõ´ò¿ª¡°¶©µ¥¡±´°Ì壬Ìí¼ÓмǼ²¢ÏÔʾ¼Ç¼½øÐб༡£Ê¹ÓÃÊý¾Ý·ÃÎʶÔÏó (DAO) ʱ£¬ÓÐÐí¶à¿ÉÒÔÓÃÓڸôúÂëµÄÔöÇ¿¹¦ÄÜ¡£ÀýÈ磬Äú¿ÉÒÔÐ޸ĴúÂëÀ´¼ìË÷¿Í»§µÄ×îºó¶©µ¥²¢¸´ÖÆËü£¬¶ø²»Óôò¿ª¡°¶©µ¥¡±´°Ì塣ΪÁË˵Ã÷Ä¿µÄ£¬±¾Ê¾ÀýʹÓô°Ìå±¾ÉíÀ´Ìí¼ÓмǼ¡£ ÔÚÊÓͼ²Ëµ¥ÖУ¬µ¥»÷´úÂ룬Ȼºó¼üÈëÏÂÁгÌÐò£º Public Function SetShipTo() As Boolean Call CustomerID_AfterUpdate SetShipTo = True End Function ¡°¶©µ¥¡±´°ÌåµÄÀàÄ£¿éÖÐÐèÒªÓиóÌÐò£¬²ÅÄÜÖ§³Ö clsTest ÀàÄ£¿éʾÀý¡£¸Ã³ÌÐòµ÷Óà CustomerID ¿Ø¼þµÄ AfterUpdate ʼþ¡£ÐèÒª¸üд°ÌåÉϵġ°ÊÕ»õÕß¡±ÐÅÏ¢£¬ÕâÊǵ±Óû§´Ó CustomerID ÁбíÖÐÑ¡Ôñ¡°¿Í»§¡±Ê±Í¨¹ýÓû§½çÃæ´¥·¢µÄ¡£ÓÉÓÚ CreateClass1() ÑùÀý³ÌÐòÔÚ´úÂëÖÐÉèÖÃÁË CustomerID Öµ£¬Òò´ËÄÜÌṩһÖÖ´¥·¢ AfterUpdate ʼþºÍ¸üС°ÊÕ»õÕß¡±ÐÅÏ¢µÄ·½Ê½¡£
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Ö´ÐÐÏÂÁв½Ö裬Ôڹرա°¶©µ¥¡±´°ÌåºÍжÔØ This_frm ±äÁ¿µÄ clsTest ÀàÄ£¿éÖд´½¨ Terminate ʼþ£º ÔÚ¡°Éè¼Æ¡±ÊÓͼÖдò¿ª clsTest ÀàÄ£¿é¡£ ÔÚÄ£¿é´°¿ÚµÄ¶ÔÏó¿òÖÐÑ¡ÔñÀà¡£ ÔÚÄ£¿é´°¿ÚµÄ¹ý³Ì¿òÖÐÑ¡ÔñÖÕÖ¹¡£ Ìí¼ÓÒÔϳÌÐò£º Private Sub Class_Terminate() DoCmd.Close acForm, This_frm.Name Set This_frm = Nothing MsgBox "Class Terminated", vbInformation, "Class Example" End Sub ²âÊÔÑùÀýÀàÄ£¿é Ö´ÐÐÏÂÁв½Öè²âÊÔ clsTest ÀàÄ£¿éµÄ¹¦ÄÜ£º н¨Ò»¸ö±ê׼ģ¿é²¢½«Ëü±£´æΪ Module1¡£ ¼üÈëÒÔϳÌÐò£º Function CreateClass1() As Boolean Dim cls As New clsTest Dim varResult As Variant MsgBox cls.ClassState, vbInformation, "Class Example" varResult = cls.AddInvoice("ALFKI") MsgBox cls.ClassState, vbInformation, "Class Example" Set cls = Nothing CreateClass1 = True End Function Òª²âÊԸú¯Êý£¬ÇëÔÚ¡°Á¢¼´¡±´°¿ÚÖмüÈëÏÂÁдúÂëÐУ¬È»ºó°´ ENTER£º ?CreateClass1()
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