数据库中存取文件

发布: 2007-7-01 21:48 | 作者: admin | 来源: | 查看: 17次 | 进入软件测试论坛讨论

´*************************************************************************
´**
´** 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