在VF中像本地表一样使用ADO远程数据表 VF9.0中使用CursorAdapter更新数据

VF中,我们可以通过ADO来取得数据并且可以绑定到窗体上
但是ADO使用使用起来并不是那么方便,比如不能方便地插入,更新数据,而在VF的本地环境中,如果加载了数据环境
那么这一切就变得比较轻松了,

这里我们可以做使用VF自带的数据环境中的ADO的自动生成CursorAdapter
的向导来,为我们生成相关的代码,然后加以改造就可以了
生成的SCX文件用EditPlus或者UtlraEdit打开就可以了,可以从里边清楚地看到代码
以下是我改造的一段代码

Define Class Data1 As DataEnvironment && 数据环境类
 Name = "Dataenvironment"
 
 Top = 220
 Left = 1
 Width = 520
 Height = 200
 Datasource = .Null.
 DataSourceType = "ADO" 

 Procedure BeforeOpenTables
 *** Select connection code: DO NOT REMOVE

 Local loConnDataSource
 loConnDataSource = Createobject('ADODB.Connection')
 ***<DataSource>
 
 &&loConnDataSource.ConnectionString = [Provider=SQLOLEDB.1;Password=cxy;Persist Security Info=True;User ID=sa;Ini] + ;
 && [tial Catalog=bussetup;Data Source=.;]
 
 loConnDataSource.ConnectionString = conString
 ***</DataSource>
 loConnDataSource.Open()
 This.Datasource = Createobject('ADODB.RecordSet')
 This.Datasource.CursorLocation   = 3  && adUseClient
 This.Datasource.LockType         = 3  && adLockOptimistic
 This.Datasource.ActiveConnection = loConnDataSource
 *** End of Select connection code: DO NOT REMOVE

 ENDPROC
 
Enddefine && 添加 Cursor 类对象 
 
 
 
 

DEFINE CLASS demo as CursorAdapter
UseDeDataSource= .T.
 
SelectCmd="select * from ........."
 

CursorSchema ="ID I, 日期 T"
 

 

Alias = "demotable"
Flags = 0
KeyFieldList = "ID"
Tables = ".......D"
UpdatableFieldList = "................"
UpdateNameList = "......................."
UseCursorSchema = .T.
Name = "demo"

 Procedure Init
 *** Setup code: DO NOT REMOVE
 Local llReturn
 Do Case
 Case Not Pemstatus(This, '__VFPSetup', 5)
  This.AddProperty('__VFPSetup', 0)
 Case This.__VFPSetup = 1
  This.__VFPSetup = 2
 Case This.__VFPSetup = 2
  This.__VFPSetup = 0
  Return
 Endcase
 Set Multilocks On
 llReturn = DoDefault()
 *** End of Setup code: DO NOT REMOVE

 *** Setup code: DO NOT REMOVE
 If This.__VFPSetup = 1
  This.__VFPSetup = 2
 Endif
 Return llReturn
 *** End of Setup code: DO NOT REMOVE

 Endproc
 Procedure AutoOpen
 *** Setup code: DO NOT REMOVE
 If Not Pemstatus(This, '__VFPSetup', 5)
  This.AddProperty('__VFPSetup', 1)
  This.Init()
 Endif
 *** End of Setup code: DO NOT REMOVE

 Endproc

ENDDEFINE

&&这是一些表格
DEFINE CLASS grdDemotable as Grid
columnCount = 29
Left = 48
RecordSource = "demotable"
RecordSourceType = 1
Top = 24
Name = "grdDemotable"
Column1.ControlSource = "demotable.id"
Column1.Name = "Column1"
................
...............
ENDDEFINE

Define Class cxyform As Form
 Top = 0
 Left = 0
 Height = 386
 Width = 587
 DoCreate = .T.
 Caption = "cxyform"
 Name = "FORM1"
 
 DataEnvironment="" && DataEnvironment 是表单的一个属性

 Procedure Destroy 

 Try
  Thisform.DataEnvironment.CloseTables && 在 destroy 过程的结束处关闭表
 Catch To mException
   RETURN .f.
 ENDTRY
 
 thisform.Hide
 Clear Events
 ENDPROC
 
 
 Procedure Unload 
 Clear Events
 
 ENDPROC
 
 Procedure Load
 * DataEnvironment 被实例化,且表单的属性
 * DataEnvironment 引用该对象. DataEnvironment
 * 并没有实际地添加到表单. THISFORM.DATAENVIRONMENT
 * 只是一个指向 DataEnvironment 对象的指针.
 myde=Createobject("Data1")
 Thisform.DataEnvironment=myde
 myde.ADDOBJECT("demoname", "demo")
 &&myde.demoname.selectcmd="select top 10 * from ................"
 myde.demoname.selectcmd=comSql

 
 * 在 LOAD 开始时打开表.
 Thisform.DataEnvironment.OpenTables
 thisform.AddObject("bb","grdDemotable")
 thisform.bb.visible=.T. 
 thisform.bb.Width=thisform.Width
 thisform.bb.Height=thisform.Height
 thisform.bb.Top=0
 thisform.bb.Left=0  
 
 
 thisform.bb.Column1.visible=.f. 
 thisform.bb.Column2.visible=.f. 
 thisform.bb.Column3.visible=.f.
 thisform.bb.Column4.visible=.f. 
 thisform.bb.Column5.visible=.f.
 thisform.bb.Column6.visible=.f.
 thisform.bb.Column7.visible=.f.
 thisform.bb.Column8.header1.caption="站点名称"
 thisform.bb.Column9.header1.caption="全票"
 
 thisform.bb.Column12.visible=.f.
 thisform.bb.Column13.header1.caption="结进金额" 
 

 
 BINDEVENT(this,"Resize",this,"changesize")
  
 ENDPROC 
 
 PROCEDURE changesize
  thisform.bb.width=thisform.Width
  thisform.bb.height=thisform.Height
 ENDPROC
 

Enddefine