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VBA将excel数据表生成JSON文件

2017-07-23 源码库 www.aspku.com 大字

ADODB.Stream创建UTF-8+BOM编码的文本文件。

然后遍历数据区,格式化数据,输出即可。

小数据还行,大数据没测试。

另,使用fso创建的文本文件编码为ANSI,ajax解析json时出现乱码无法正常解析。

Sub ToJson() '创建UTF8文本文件
 myrange = Worksheets("sheet1").UsedRange '通过有效数据区来选择数据
 'myrange = ActiveWorkbook.Names("schoolinfo").RefersToRange '通过定义的名称来选择数据
 'myrange = Range(Worksheets("sheet1").Range("a1").End(xlDown), Worksheets("sheet1").Range("a1").End(xlToRight)) '通过标题行的最大行最大列来选择数据
 
Total = UBound(myrange, 1) '获取行数
Fields = UBound(myrange, 2) '获取列数
 
   Dim objStream As Object
   Set objStream = CreateObject("ADODB.Stream")
   
   With objStream
      .Type = 2
      .Charset = "UTF-8"
      .Open
      .WriteText "{""total"":" & Total & ",""contents"":["
   
      For i = 2 To Total
        .WriteText "{"
        For j = 1 To Fields
          .WriteText """" & myrange(1, j) & """:""" & Replace(myrange(i, j), """", "\""") & """"
           If j <> Fields Then
            .WriteText ","
           End If
        Next
        If i = Total Then
            .WriteText "}"
        Else
            .WriteText "},"
        End If
      Next
 
      .WriteText "]}"
      .SaveToFile ActiveWorkbook.FullName & ".json", 2
   End With
   Set objStream = Nothing
End Sub

最近在写一网站网页,需要从后台ASP网页查询到的MYSQL记录集返回给前台ASP网页,我们知道AJAX是无力从后台返回数据库记录集给前台网页的.

查阅大量资料,就目前而言记录集转换成JSON格式流,再由前台VBA导入WEBoffice控件的excel是个不错的选择.经过些思考,现将function过程代码奉献给大家.

    Function GetJSON(Rs)
    Dim JSON  
    dim returnStr 
    dim i
    dim oneRecord   
    if Rs.eof=false and Rs.Bof=false then
    returnStr="{ "&chr(34)&"records"&chr(34)&":["    
    while Rs.eof=false
    
     for i=0 to Rs.Fields.Count -1
      oneRecord=oneRecord & chr(34) & Rs.Fields(i).Name & chr(34) &":" 
      oneRecord=oneRecord & chr(34) & Rs.Fields(i).Value & chr(34) &","
     Next
     oneRecord=left(oneRecord,InStrRev(oneRecord,",")-1)
     oneRecord=oneRecord & "},"
     returnStr=returnStr  & oneRecord
     Rs.MoveNext
    Wend
    returnStr=left(returnStr,InStrRev(returnStr,",")-1)
    returnStr=returnStr & "]}"
    end if 
    GetJSON=returnStr   
  End Function

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