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