CreateRecordset 方法范例 (VB)

用户可以创建 Recordset 对象并指定列信息，然后将数据插入 Recordset 对象；基本行集合缓存插入的数据。

以下代码范例显示如何使用 RDSServer.DataFactory 对象来定义 Recordset。使用RDS.DataControl 对象也可以实现相同功能。

Sub RsDefineShape()
   
    Dim vntRecordShape(3)
    Dim vntField1Shape(3)
    Dim vntField2Shape(3)
    Dim vntField3Shape(3)
    Dim vntField4Shape(3)

    ' 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.

    Dim NewRs

    ' 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)
    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(#1/5/96#)
    fieldVals(3) = 123.456
    NewRS.AddNew fields, fieldVals

    fieldVals(0) = "Mary"
    fieldVals(1) = 6
    fieldVals(2) = CDate(#6/5/96#)
    fieldVals(3) = 31
    NewRS.AddNew fields, fieldVals

    fieldVals(0) = "Alex"
    fieldVals(1) = 13
    fieldVals(2) = CDate(#1/6/96#)
    fieldVals(3) = 34.0001
    NewRS.AddNew fields, fieldVals

    fieldVals(0) = "Susan"
    fieldVals(1) = 13
    fieldVals(2) = CDate(#8/6/96#)
    fieldVals(3) = 0.0
    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
    Set ADC1.SourceRecordset = NewRS

End Sub