form1.frm

VB6.0源码---将图片以数据流保存到数据库。很好的实例参考。

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   4380
   ClientLeft      =   60
   ClientTop       =   375
   ClientWidth     =   5130
   LinkTopic       =   "Form1"
   ScaleHeight     =   4380
   ScaleWidth      =   5130
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton Command2 
      Caption         =   "save"
      Height          =   495
      Left            =   3240
      TabIndex        =   1
      Top             =   3600
      Width           =   1215
   End
   Begin VB.CommandButton Command1 
      Caption         =   "read"
      Height          =   495
      Left            =   840
      TabIndex        =   0
      Top             =   3600
      Width           =   1215
   End
   Begin VB.Image Image1 
      Height          =   3255
      Left            =   360
      Stretch         =   -1  'True
      Top             =   120
      Width           =   4455
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'** 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

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=C:\db1.mdb"
'连接sqlserver数据库的语句写法是：
'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

Private Sub Command1_Click()
    Call s_ReadFile
End Sub
Private Sub Command2_Click()
    Call s_SaveFile
End Sub

'=========================================================
'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 membership", iConc, 1, 3
        .AddNew '新增一条记录
        .Fields("id") = "4"
        .Fields("name") = "ahla"
        .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 *  from membership where id='2'", 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 & "\test2.jpg"
    End With

'关闭对象
    iRe.Close
    iStm.Close
End Sub
'=====================================================================