如何将文件直接写入MDB数据库中并读取?
我想将一个自定义的文件写入MDB数据库中并读取出来??
最好给能给出详细代码,谢谢了!
[解决办法]
appendchunk
getchunk
field的属性，用这两种读或取．．．
其他的google就成了
[解决办法]
建议楼主在vb的 "数据库 "小版搜索 "图片 "关键字,里面有关于数据库保存图片的贴就有更好的答案,
[解决办法]
使用流对象从数据库存取文件
打开vb6,新建工程。
添加两个按钮,一个image控件
注意:Access中的photo字段类型为OLE对象.
SqlServer中的photo字段类型为Image
'** 引用 Microsoft ActiveX Data Objects 2.5 Library 及以上版本
‘2.5版本以下不支持Stream对象
Dim iConcstr As String
Dim iConc As ADODB.Connection
'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
'读取文件到内容
Set iStm = New ADODB.Stream
With iStm
.Type = adTypeBinary '二进制模式
.Open
.LoadFromFile App.Path + "\test.jpg "
End With
'打开保存文件的表
Set iRe = New ADODB.Recordset
With iRe
.Open "select * from img ", iConc, 1, 3
.AddNew '新增一条记录
.Fields( "photo ") = iStm.Read
.Update
End With
'完成后关闭对象
iRe.Close
iStm.Close
End Sub
Sub s_ReadFile()
Dim iStm As ADODB.Stream
Dim iRe As ADODB.Recordset
'打开表
Set iRe = New ADODB.Recordset
‘得到最新添加的纪录
iRe.Open "select top 1 * from img order by id desc ", iConc, adOpenKeyset, adLockReadOnly
'保存到文件
Set iStm = New ADODB.Stream
With iStm
.Mode = adModeReadWrite
.Type = adTypeBinary
.Open
.Write iRe( "photo ")
‘这里注意了,如果当前目录下存在test1.jpg,会报一个文件写入失败的错误.
.SaveToFile App.Path & "\test1.jpg "
End With
Image1.Picture = LoadPicture(App.Path & "\test1.jpg ")
'关闭对象
iRe.Close
iStm.Close
End Sub
Private Sub Command1_Click()
Call s_ReadFile
End Sub
Private Sub Command2_Click()
Call s_SaveFile
End Sub
Private Sub Form_Load()
'数据库连接字符串
iConcstr = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False " & _
";Data Source=F:\csdn_vb\database\保存图片\access图片\img.mdb "
‘下面的语句是连接sqlserver数据库的.
‘iConcstr = "Provider=SQLOLEDB.1;Persist Security Info=True; " & _
‘ "User ID=sa;Password=;Initial Catalog=test;Data Source=yang "
Set iConc = New ADODB.Connection
iConc.Open iConcstr
End Sub
Private Sub Form_Unload(Cancel As Integer)
iConc.Close
Set iConc = Nothing
End Sub
