解决图片保存问题
大家好:
我现在遇到了一个这个问题,我用的是image控件,sql server数据库,我在保存是image中的图片到数据库中时,提示 "操作数类型冲突: text 与 image 不兼容 ",是不是要把图片转化成二进制呀,这个地方确实不明白,望高手指点!!!在线等!!!!
用到的sql语句是 "sRsChaXun = "UPDATE Tperson set cphoto = ' " & StmPic.Read & " ' where id = ' " & iMaxId & " ' " "
[解决办法]
用ADO的AppendChunk方法存入，相反的，读出用GetAppendChunk。
数据库字段应该是Image或Text型。
AppendChunk and GetChunk Methods Example
This example uses the AppendChunk and GetChunk methods to fill an image field with data from another record, 32K at a time. In a real application, one might use a procedure like this to copy a record containing a photo or graphic image field from one table to another. In this example, the record is simply being copied back to same table. Note that all the chunk manipulation takes place within a single AddNew-Update sequence.
Public Sub AppendChunkX()
Dim cnn1 As ADODB.Connection
Dim rstPubInfo As ADODB.Recordset
Dim strCnn As String
Dim strPubID As String
Dim strPRInfo As String
Dim lngOffset As Long
Dim lngLogoSize As Long
Dim varLogo As Variant
Dim varChunk As Variant
Const conChunkSize = 100
' Open a connection.
Set cnn1 = New ADODB.Connection
strCnn = "driver={SQL Server};server=srv; " & _
"uid=sa;pwd=;database=pubs "
cnn1.Open strCnn
' Open the pub_info table.
Set rstPubInfo = New ADODB.Recordset
rstPubInfo.CursorType = adOpenKeyset
rstPubInfo.LockType = adLockOptimistic
rstPubInfo.Open "pub_info ", cnn1, , , adCmdTable
' Prompt for a logo to copy.
strMsg = "Available logos are : " & vbCr & vbCr
Do While Not rstPubInfo.EOF
strMsg = strMsg & rstPubInfo!pub_id & vbCr & _
Left(rstPubInfo!pr_info, InStr(rstPubInfo!pr_info, ", ") - 1) & _
vbCr & vbCr
rstPubInfo.MoveNext
Loop
strMsg = strMsg & "Enter the ID of a logo to copy: "
strPubID = InputBox(strMsg)
' Copy the logo to a variable in chunks.
rstPubInfo.Filter = "pub_id = ' " & strPubID & " ' "
lngLogoSize = rstPubInfo!logo.ActualSize
Do While lngOffset < lngLogoSize
varChunk = rstPubInfo!logo.GetChunk(conChunkSize)
varLogo = varLogo & varChunk
lngOffset = lngOffset + conChunkSize
Loop
' Get data from the user.
strPubID = Trim(InputBox( "Enter a new pub ID: "))
strPRInfo = Trim(InputBox( "Enter descriptive text: "))
' Add a new record, copying the logo in chunks.
rstPubInfo.AddNew
rstPubInfo!pub_id = strPubID
rstPubInfo!pr_info = strPRInfo
lngOffset = 0 ' Reset offset.
Do While lngOffset < lngLogoSize
varChunk = LeftB(RightB(varLogo, lngLogoSize - lngOffset), _
conChunkSize)
rstPubInfo!logo.AppendChunk varChunk
lngOffset = lngOffset + conChunkSize
Loop
rstPubInfo.Update
' Show the newly added data.
MsgBox "New record: " & rstPubInfo!pub_id & vbCr & _
"Description: " & rstPubInfo!pr_info & vbCr & _
"Logo size: " & rstPubInfo!logo.ActualSize
' Delete new record because this is a demonstration.
rstPubInfo.Requery
cnn1.Execute "DELETE FROM pub_info " & _
"WHERE pub_id = ' " & strPubID & " ' "
rstPubInfo.Close
cnn1.Close
End Sub