这里有一段代码,存储用户的图片信息到表格里:
Function Save_Image(CommDial As CommonDialog, FX As Long, Column As Field)
Dim Identification As Long
'-----> Position Record Pointer
Pictures.MoveFirst
Identification = txtCustID
strFind = "CustID = " & Identification & ""
Pictures.Find strFind
'-----> Save Images
Pictures.Edit
DataFile = 1
Open CommDial.FileName For Binary Access Read As DataFile
FX = LOF(DataFile) ' Length of data in file
If FX = 0 Then
Close DataFile
Exit Function
End If
'-----> Split Up to Avoid Buffer Overflow
Chunks = FX \ ChunkSize
Fragment = FX Mod ChunkSize
ReDim Chunk(Fragment)
Get DataFile, , Chunk()
Column.AppendChunk Chunk()
ReDim Chunk(ChunkSize)
For I = 1 To Chunks
Get DataFile, , Chunk()
Column.AppendChunk Chunk()
Next I
Close DataFile
Pictures.UpdateEnd Function
由于这段程序是连接ACCESS数据库用的,当我改连SQL SERVER数据库之后运行Pictures.Edit语句报错,我将Pictures.Edit和Pictures.Edit注释起来之后,运行整个工程文件是发现执行了这个Save_Image方法后再执行Pictures.Close会报错。(Pictures 是个RECORDSET对象)
谁能很好的理解代码告诉我改成连SQL数据库在这段代码里面一应该怎么改呢?
有关变量的定义如下:
Dim CustPicts As ADODB.Connection
Dim Pictures As ADODB.Recordset
Dim DataFile As Integer, Chunks As Integer
Dim Fragment As Integer, Chunk() As Byte, I As Integer
Const ChunkSize As Integer = 16384 '(16K Chunk Size)
Const LongValue As Long = 2147483647
非常感谢!
Function Save_Image(CommDial As CommonDialog, FX As Long, Column As Field)
Dim Identification As Long
'-----> Position Record Pointer
Pictures.MoveFirst
Identification = txtCustID
strFind = "CustID = " & Identification & ""
Pictures.Find strFind
'-----> Save Images
Pictures.Edit
DataFile = 1
Open CommDial.FileName For Binary Access Read As DataFile
FX = LOF(DataFile) ' Length of data in file
If FX = 0 Then
Close DataFile
Exit Function
End If
'-----> Split Up to Avoid Buffer Overflow
Chunks = FX \ ChunkSize
Fragment = FX Mod ChunkSize
ReDim Chunk(Fragment)
Get DataFile, , Chunk()
Column.AppendChunk Chunk()
ReDim Chunk(ChunkSize)
For I = 1 To Chunks
Get DataFile, , Chunk()
Column.AppendChunk Chunk()
Next I
Close DataFile
Pictures.UpdateEnd Function
由于这段程序是连接ACCESS数据库用的,当我改连SQL SERVER数据库之后运行Pictures.Edit语句报错,我将Pictures.Edit和Pictures.Edit注释起来之后,运行整个工程文件是发现执行了这个Save_Image方法后再执行Pictures.Close会报错。(Pictures 是个RECORDSET对象)
谁能很好的理解代码告诉我改成连SQL数据库在这段代码里面一应该怎么改呢?
有关变量的定义如下:
Dim CustPicts As ADODB.Connection
Dim Pictures As ADODB.Recordset
Dim DataFile As Integer, Chunks As Integer
Dim Fragment As Integer, Chunk() As Byte, I As Integer
Const ChunkSize As Integer = 16384 '(16K Chunk Size)
Const LongValue As Long = 2147483647
非常感谢!
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