数据库读取保存图片

purana 发表于 2006-4-28 18:48:58

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 StringDim 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.CloseEnd Sub

purana 发表于 2006-4-28 18:49:09

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.CloseEnd SubPrivate Sub Command1_Click()Call s_ReadFileEnd SubPrivate Sub Command2_Click()Call s_SaveFileEnd SubPrivate 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 iConcstrEnd SubPrivate Sub Form_Unload(Cancel As Integer)iConc.CloseSet iConc = NothingEnd Sub

马大哈 发表于 2006-4-28 19:41:40

哈哈,顶!!此代码大大有用!

purana 发表于 2006-4-30 12:46:33

嗯 ..之前用ADO2.0的时候..要存取图片...要用二进制来存取...现在有这个stream流..就方便多了..

马大哈 发表于 2006-11-3 20:37:58

不多时,应该问题不大如果图片太多,的确会影响速度

页: [1]

紫水晶编程技术论坛 - 努力打造成全国最好的编程论坛's Archiver

数据库读取保存图片