如何才能往数据库里读取图片数据或者从数据库里读图片

给你提供个ACCESS版的VB代码，使用时调用这些过程即可：
'使用ADODBStream来保存/读取图像文件到数据库
'引用Microsoft ActiveX Data Objects 25 Library及以上版本

'保存文件到数据库中
Sub SaveFile()
Dim Stm As New ADODBStream
Dim Cnn As New ADODBConnection
Dim rs As New ADODBRecordset
Dim strCnn As String

strCnn = "Provider=MicrosoftJetOLEDB40;Persist Security Info=False;Data Source=" & _
AppPath & "\DB1mdb"
CnnOpen strCnn

'读取文件到内存(二进制模式)
With Stm
Type = adTypeBinary
Open
LoadFromFile AppPath + "\Image1bmp"
End With

With rs
Open "SELECT FROM TABLE1", Cnn, 1, 3
AddNew
Fields("IMAGE") = StmRead
Update
End With

rsClose
StmClose
Set rs = Nothing
Set Cnn = Nothing
Set Stm = Nothing
End Sub
'从数据库中读取图像文件
Sub ReadFile()
Dim Stm As New ADODBStream
Dim Cnn As New ADODBConnection
Dim rs As New ADODBRecordset
Dim strCnn As String

strCnn = "Provider=MicrosoftJetOLEDB40;Persist Security Info=False;Data Source=" & _
AppPath & "\DB1mdb"
CnnOpen strCnn
rsOpen "SELECT IMAGE FROM TABLE1 WHERE ID = 18", Cnn, adOpenKeyset, adLockReadOnly

'保存到文件
With Stm
Mode = adModeReadWrite
Type = adTypeBinary
Open
Write rs("IMAGE")
SaveToFile AppPath + "\Image2bmp"
End With

'显示
Picture1Picture = LoadPicture(AppPath + "\Image2bmp")

rsClose
StmClose
Set rs = Nothing
Set Cnn = Nothing
Set Stm = Nothing
End Sub

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