参考这个.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
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
Dim FileName As String
Dim i As Integer
Private Sub cmdSave_Click()
If Trim(txtFile) = "" Then MsgBox "請選擇上傳文件!", vbExclamation, "系統提示!": Exit Sub
On Error GoTo err_file
Dim Jsr As String
For i = 0 To Listfilename.ListCount - 1
If Listfilename.Selected(i) = True Then
Jsr = Jsr & Listfilename.List(i) & ";"
End If
Next i
If Trim(Jsr) = "" Then MsgBox "接收人不能為空!", vbExclamation, "系統提示!": Exit Sub
Jsr = Left(Jsr, Len(Jsr) - 1)
Dim cn As ADODB.Connection
Dim rs As ADODB.Recordset
Dim mst As ADODB.Stream
Me.MousePointer = 11
Set cn = New ADODB.Connection
cn.ConnectionString = ConnectString
cn.Open
Set rs = New ADODB.Recordset
rs.Open "select * from tb_file", cn, adOpenStatic, adLockOptimistic
Set mst = New ADODB.Stream
mst.Type = adTypeBinary
mst.Open
mst.LoadFromFile txtFile.Text
rs.AddNew
rs.Fields(1).Value = Trim(txtSubject.Text) '主題
rs.Fields(2).Value = Trim(txtfiletext.Text) '描述
rs.Fields(3).Value = Trim(txtPerson.Text) '發送人
rs.Fields(4).Value = Trim(Jsr) '接收人
rs.Fields(5).Value = Trim(Format(dtpfsrq.Value, "yyyy-mm-dd"))
rs.Fields(6).Value = mst.Read
rs.Fields(7).Value = FileName
rs.Update
rs.Close
cn.Close
Me.MousePointer = 0
MsgBox "文件發送成功!", vbInformation, "系統提示!"
err_file:
If Err.Number <> 0 Then MsgBox Err.Description
End Sub
当@str为 varchar时 长度不能超过 8000
当@str为 nvarchar时 长度不能超过 4000.
长度太长 会被右截断 或者 异常什么的.
为什么要这样做 你想达到什么目的 或者有更简单直接有效的方法.
{
m_pCmd->ActiveConnection=(ADODB::_Connection *)dbcon;
m_pCmd->CommandText=_T("insert into tbtest(image) values(?)") ;
m_pCmd->CommandType=ADODB::adCmdText;
m_pCmd->NamedParameters=false;
m_pCmd->Parameters->Refresh();//设置参数....
m_pCmd->Execute(NULL,NULL,ADODB::adCmdText);}