'http://support.microsoft.com/default.aspx?scid=kb;EN-US;258038'************************************************************************* '** '** 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:\csdn_vb\database\保存图片\img.mdb" Dim iConc As ADODB.Connection Set iConc = New ADODB.Connection
iConc.Open iConcStr '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 + "\com.doc" 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 SubSub s_ReadFile() Dim iStm As ADODB.Stream Dim iRe As ADODB.Recordset Dim iConc As String
'打开表 Set iRe = New ADODB.Recordset iRe.Open "img", iConc, adOpenKeyset, adLockReadOnly iRe.Filter = "id=3" '比如单击datagrid后找到id=3的纪录
'保存到文件 Set iStm = New ADODB.Stream With iStm .Mode = adModeReadWrite .Type = adTypeBinary .Open .Write iRe("photo") .SaveToFile "c:\com.doc" End With
OLE1.SourceDoc = "c:\\com.doc" OLE1.Action = 1 'use the old action method OLE1.SizeMode = vbOLESizeAuttoSize '调节对象大小使其正好充满OLE容器控件 'Picture1.Picture = LoadPicture("c:\tesd.bmp")
'关闭对象 iRe.Close iStm.Close End SubPrivate Sub Command1_Click() Call s_ReadFile End SubPrivate Sub Command2_Click() Call s_SaveFile End Sub字段类型是image 可以存文档,图片等等
使用Stream对象,可以实现对数据库的图像存取。 数据库中存放图像的字段是二进制类型(Access为OLE类型)。 比如,如果用“CommonDialog”控件来选择你硬盘上的图像文件; 用“Picture”控件来显示图像,那么下面的代码供参考: (已连接数据库,打开了相应的记录集rs) Dim StmPic As ADODB.Stream Dim StrPicTemp As String ...... '保存你所选择的图像 Set StmPic = New ADODB.Stream StmPic.Type = adTypeBinary '指定流是二进制类型 StmPic.Open '将数据获取到Stream对象中 StmPic.LoadFromFile (CommonDialog1.FileName) '将选择的图像加载到打开的StmPic中 rs.AddNew rs.Fields(1).Value = StmPic.Read '从StmPic对象中读取数据 rs.Update StmPic.Close ...... '读取显示数据库中的图像 Set StmPic = New ADODB.Stream StrPicTemp = "c:\temp.tmp" '临时文件,用来保存读出的图片 With StmPic .Type = adTypeBinary .Open .Write rs.Fields(1) '写入数据库中的数据至Stream中 .SaveToFile StrPicTemp, adSaveCreateOverWrite '将Stream中数据写入临时文件中 .Close End With Picture1.Picture = LoadPicture(StrPicTemp) '用Picture控件显示图像 ......
'**
'** 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:\csdn_vb\database\保存图片\img.mdb"
Dim iConc As ADODB.Connection
Set iConc = New ADODB.Connection
iConc.Open iConcStr
'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 + "\com.doc"
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 SubSub 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=F:\csdn_vb\database\保存图片\img.mdb"
'打开表
Set iRe = New ADODB.Recordset
iRe.Open "img", iConc, adOpenKeyset, adLockReadOnly
iRe.Filter = "id=3" '比如单击datagrid后找到id=3的纪录
'保存到文件
Set iStm = New ADODB.Stream
With iStm
.Mode = adModeReadWrite
.Type = adTypeBinary
.Open
.Write iRe("photo")
.SaveToFile "c:\com.doc"
End With
OLE1.SourceDoc = "c:\\com.doc"
OLE1.Action = 1 'use the old action method
OLE1.SizeMode = vbOLESizeAuttoSize '调节对象大小使其正好充满OLE容器控件 'Picture1.Picture = LoadPicture("c:\tesd.bmp")
'关闭对象
iRe.Close
iStm.Close
End SubPrivate Sub Command1_Click()
Call s_ReadFile
End SubPrivate Sub Command2_Click()
Call s_SaveFile
End Sub字段类型是image
可以存文档,图片等等
数据库中存放图像的字段是二进制类型(Access为OLE类型)。
比如,如果用“CommonDialog”控件来选择你硬盘上的图像文件;
用“Picture”控件来显示图像,那么下面的代码供参考:
(已连接数据库,打开了相应的记录集rs)
Dim StmPic As ADODB.Stream
Dim StrPicTemp As String
......
'保存你所选择的图像
Set StmPic = New ADODB.Stream
StmPic.Type = adTypeBinary '指定流是二进制类型
StmPic.Open '将数据获取到Stream对象中
StmPic.LoadFromFile (CommonDialog1.FileName) '将选择的图像加载到打开的StmPic中
rs.AddNew
rs.Fields(1).Value = StmPic.Read '从StmPic对象中读取数据
rs.Update
StmPic.Close
......
'读取显示数据库中的图像
Set StmPic = New ADODB.Stream
StrPicTemp = "c:\temp.tmp" '临时文件,用来保存读出的图片
With StmPic
.Type = adTypeBinary
.Open
.Write rs.Fields(1) '写入数据库中的数据至Stream中
.SaveToFile StrPicTemp, adSaveCreateOverWrite '将Stream中数据写入临时文件中
.Close
End With
Picture1.Picture = LoadPicture(StrPicTemp) '用Picture控件显示图像
......