数据库中存取文件

'*************************************************************************
'**
'** 使用 ADODB.Stream 保存/读取文件到数据库
'** 引用 Microsoft ActiveX Data Objects 2.5 Library 及以上版本
'**
'** ----- 数据库连接字符串模板 ---------------------------------------
'** ACCESS数据库
'** iConcStr = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False" & _
'**     ";Data Source=数据库名"
'**
'** SQL数据库
'** iConcStr = "Provider=SQLOLEDB.1;Persist Security Info=True;" & _
'**     "User ID=用户名;Password=密码;Initial Catalog=数据库名;Data Source=SQL服务器名"
'**
'*************************************************************************
'
'保存文件到数据库中
Sub s_SaveFile()
    Dim iStm As ADODB.Stream
    Dim iRe As ADODB.Recordset
    Dim iConcStr As String
   
    '数据库连接字符串
    iConcStr = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False" & _
        ";Data Source=F:/My Documents/客户资料1.mdb"
   
    '读取文件到内容
    Set iStm = New ADODB.Stream
    With iStm
        .Type = adTypeBinary    '二进制模式
        .Open
        .LoadFromFile "c:/test.doc"
    End With
   
    '打开保存文件的表
    Set iRe = New ADODB.Recordset
    With iRe
        .Open "表", iConc, adOpenKeyset, adLockOptimistic
        .AddNew         '新增一条记录
        .Fields("保存文件内容的字段") = iStm.Read
        .Update
    End With
   
    '完成后关闭对象
    iRe.Close
    iStm.Close
End Sub

'从数据库中读取数据,保存成文件
Sub s_ReadFile()
    Dim iStm As ADODB.Stream
    Dim iRe As ADODB.Recordset
    Dim iConc As String
   
    '数据库连接字符串
    iConc = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False" & _
        ";Data Source=//xz/c$/Inetpub/zj/zj/zj.mdb"
   
    '打开表
    Set iRe = New ADODB.Recordset
    iRe.Open "tb_img", iConc, adOpenKeyset, adLockReadOnly
    iRe.Filter = "id=64"
   
    '保存到文件
    Set iStm = New ADODB.Stream
    With iStm
        .Mode = adModeReadWrite
        .Type = adTypeBinary
        .Open
        .Write iRe("img")
        .SaveToFile "c:/test.doc"
    End With
   
    '关闭对象
    iRe.Close
    iStm.Close
End Sub

 

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