动态建立查询解决交叉表字段不确定的问题

报表资料来源是交叉表，列标题无法确定而导致报表字段不可控的解决方案。

一、问题描述：

当报表的资料来源是一个交叉表时，由于字段名无法确定，就无法直接生成报表。

二、解决方案：

先生成一个报表模板，对于无法确定的字段标题预定义一个，在报表中对字段不系结，通过报表的open事件来解决字段系结。

下面是解决一个报表，最后两列最近的两个月份：

Private Sub Report_Open(cancel As Integer)

Dim db As DAO.Database

Dim q As QueryDef

Set db = CurrentDb

Set q = db.QueryDefs(Me.RecordSource)

Dim i As Integer

Dim thisMonth, preMonth As String

Dim iStatus As Integer

thisMonth = get本月年月字串()

preMonth = get上月年月字串()

iStatus = 0

For i = q.Fields.Count - 1 To 0 Step -1

If q.Fields(i).Name = thisMonth Then

本月.ControlSource = thisMonth

iStatus = iStatus + 1

lb本月充气量.Caption = thisMonth & vbCrLf & "充气量"

Else

If q.Fields(i).Name = preMonth Then

上月.ControlSource = preMonth

iStatus = iStatus + 1

lb上月充气量.Caption = preMonth & vbCrLf & "充气量"

End If

End If

If iStatus >= 2 Then

Exit For

End If

Next i

Set q = Nothing

End Sub

Public Function get本月年月字串()

get本月年月字串 = get日期年月字串(Date)

End Function

Public Function get上月年月字串()

get上月年月字串 = get日期年月字串(GetPreMonthFirstDay())

End Function

Public Function get日期年月字串(d As Date)

get日期年月字串 = CStr(Year(d) * 100 + Month(d))

End Function

Public Function GetPreMonthFirstDay()

GetPreMonthFirstDay = DateSerial(Year(Date), Month(Date) - 1, 1)

End Function