CreateRecordset 方法示例 (VB)

可以创建 Recordset 对象并指定列信息。 然后，可以向 Recordset 对象插入数据；基础行集缓冲插入。

以下代码示例演示如何使用 RDSServer.DataFactory 对象定义 Recordset。 也可以使用 RDS.DataControl 对象执行此操作。

'BeginRsDefineShapeVB  
Sub Main()  
    On Error GoTo ErrorHandler  
  
    Dim ADF As RDSServer.DataFactory  
    Dim vntRecordShape(3)  
    Dim vntField1Shape(3)  
    Dim vntField2Shape(3)  
    Dim vntField3Shape(3)  
    Dim vntField4Shape(3)  
  
    Set ADF = New RDSServer.DataFactory  
  
    ' For each field, specify the name,  
    ' type, size, and nullability.  
  
    vntField1Shape(0) = "Name"   ' Column name.  
    vntField1Shape(1) = CInt(129)   ' Column type.  
    vntField1Shape(2) = CInt(40)   ' Column size.  
    vntField1Shape(3) = False      ' Nullable?  
  
    vntField2Shape(0) = "Age"  
    vntField2Shape(1) = CInt(3)  
    vntField2Shape(2) = CInt(-1)  
    vntField2Shape(3) = True  
  
    vntField3Shape(0) = "DateOfBirth"  
    vntField3Shape(1) = CInt(7)  
    vntField3Shape(2) = CInt(-1)  
    vntField3Shape(3) = True  
  
    vntField4Shape(0) = "Balance"  
    vntField4Shape(1) = CInt(6)  
    vntField4Shape(2) = CInt(-1)  
    vntField4Shape(3) = True  
  
    ' Put all fields into an array of arrays.  
    vntRecordShape(0) = vntField1Shape  
    vntRecordShape(1) = vntField2Shape  
    vntRecordShape(2) = vntField3Shape  
    vntRecordShape(3) = vntField4Shape  
  
    ' Use the RDSServer.DataFactory to create an empty  
    ' recordset. It takes an array of variants where  
    ' every element is itself another array of  
    ' variants, one for every column required in the  
    ' recordset.  
    ' The elements of the inner array are the column's  
    ' name, type, size, and nullability.  
    '  
    ' NOTE: You could just use the RDS.DataControl object  
    ' instead of the RDSServer.DataFactory object. In  
    ' that case, the following code would be Set NewRS  
    ' = ADC1.CreateRecordset(vntRecordShape)  
    Dim NewRs As ADODB.Recordset  
    Set NewRs = ADF.CreateRecordSet(vntRecordShape)  
  
    Dim fields(3)  
    fields(0) = vntField1Shape(0)  
    fields(1) = vntField2Shape(0)  
    fields(2) = vntField3Shape(0)  
    fields(3) = vntField4Shape(0)  
  
    ' Populate the new recordset with data values.  
    Dim fieldVals(3)  
  
    ' Use AddNew to add the records.  
    fieldVals(0) = "Joe"  
    fieldVals(1) = 5  
    fieldVals(2) = CDate(#1/5/1996#)  
    fieldVals(3) = 123.456  
    NewRs.AddNew fields, fieldVals  
  
    fieldVals(0) = "Mary"  
    fieldVals(1) = 6  
    fieldVals(2) = CDate(#6/5/1996#)  
    fieldVals(3) = 31  
    NewRs.AddNew fields, fieldVals  
  
    fieldVals(0) = "Alex"  
    fieldVals(1) = 13  
    fieldVals(2) = CDate(#1/6/1996#)  
    fieldVals(3) = 34.0001  
    NewRs.AddNew fields, fieldVals  
  
    fieldVals(0) = "Susan"  
    fieldVals(1) = 13  
    fieldVals(2) = CDate(#8/6/1996#)  
    fieldVals(3) = 0#  
    NewRs.AddNew fields, fieldVals  
  
    NewRs.MoveFirst  
  
    ' Set the newly created and populated Recordset to  
    ' the SourceRecordset property of the  
    ' RDS.DataControl to bind to visual controls  
    Dim ADC1 As RDS.DataControl  
    Set ADC1 = New RDS.DataControl  
    Set ADC1.SourceRecordset = NewRs  
  
    'Clean up  
    If NewRs.State = adStateOpen Then NewRs.Close  
    Set NewRs = Nothing  
    Set ADC1 = Nothing  
    Set ADF = Nothing  
    Exit Sub  
  
ErrorHandler:  
    ' clean up  
    If Not NewRs Is Nothing Then  
        If NewRs.State = adStateOpen Then NewRs.Close  
    End If  
    Set NewRs = Nothing  
    Set ADC1 = Nothing  
    Set ADF = Nothing  
  
    If Err <> 0 Then  
        MsgBox Err.Source & "-->" & Err.Description, , "Error"  
    End If  
End Sub  
'EndRsDefineShapeVB