想把二进制数据插入到MYSQL库里,字段为MediumBLOB类型.(存的图片)解决思路
想把二进制数据插入到MYSQL库里,字段为MediumBLOB类型.(存的图片)
查到的资料:
如果你想要把二进制数据插入到一个字符类型的字段中(例如BLOB)，下列字符必须由转义序列表示：
NUL
ASCII 0，你应该用 “\0”（一个反斜线和一个ASCII “0”字符）表示它。
\
ASCII 92，反斜线。需要用 “\\” 表示。
'
ASCII 39，单引号。需要用 “\ '” 表示。
"
ASCII 34，双引号。需要用 “\ "” 表示。
-----------------------------------
问题是:请问我如何转义二进制数据.下面里面看不出来有什么引号之类的..
二进制数据是这样格式:????āā怀怀 ????????????????????┝???‖???????┰?Ｈ???????????????????????????????????????????！?ā?āā ā????????????ā???????慑??脲??????戳色???┚??????????呓噕塗婙摣晥桧橩瑳癵硷穹蒃蚅袇誉鎒閔鞖馘???????????????????????笠????āāāā ā?????????????w???ㄡ?允愇?㈢?????刳?牢??????????????半啔坖奘捚敤杦楨獪畴睶祸艺蒃蚅袇誉鎒閔鞖馘???????????????????????笠?ú?????????薿?饠???????棈????卺???罊?櫎???????坳??汖???駹??鋏???｝?????龗???貦?蔽蠟..........
------解决方案--------------------
参考：http://bbs.xplore.cn/viewthread.php?tid=2507
------解决方案--------------------
我以前回答过多次此类问题，但2006年的贴子不能查到了。
你自己修改一下.
VB把文件存入数据库IMAGE字段
Sub Savepic(FileName As String, IndexNumber As Long)
Dim DcnNWind As New ADODB.Connection
Dim rs As ADODB.Recordset
Set rs = New ADODB.Recordset
DcnNWind.CursorLocation = adUseClient
DcnNWind.Open "Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=CUSTOM;Data Source=SERVER "
rs.CursorType = adOpenKeyset
rs.LockType = adLockOptimistic
rs.Open "CustomInfo ", DcnNWind, , adCmdTable
rs.Move (IndexNumber)
Call FileToBlob(rs.Fields( "Image "), FileName, FileLen(FileName))
rs.UpdateBatch adAffectCurrent
End Sub
Private Sub FileToBlob(fld As ADODB.Field, FileName As String, Optional ChunkSize As Long )
Dim fnum As Integer, bytesLeft As Long, bytes As Long
Dim tmp() As Byte
If (fld.Attributes And adFldLong) = 0 Then
Err.Raise 1001, , "Field doesn 't support the GetChunk method. "
End If
fnum = FreeFile
Open FileName For Binary As fnum
bytesLeft = LOF(fnum)
Do While bytesLeft
bytes = bytesLeft
If bytes > ChunkSize Then bytes = ChunkSize
ReDim tmp(1 To bytes) As Byte
Get #1, , tmp
fld.AppendChunk tmp
bytesLeft = bytesLeft - bytes
Loop
Close #fnum
End Sub
VB把文件从IMAGE字段中读到文件中。
Sub loadpic(IndexNumber As Long)
Dim DcnNWind As New ADODB.Connection
Dim rs As ADODB.Recordset
Set rs = New ADODB.Recordset
DcnNWind.CursorLocation = adUseClient
DcnNWind.Open "Provider=SQLOLEDB.1;Integrated Security=SSI;Persist Security Info=False;Initial Catalog=CUSTOM;Data Source=SERVER "
rs.CursorType = adOpenKeyset
rs.LockType = adLockOptimistic
rs.Open "CustomInfo ", DcnNWind, , adCmdTable
rs.Move (IndexNumber)
Call BlobToFile(rs.Fields( "Image "), "c:\windows\temp\tmp.bmp ", rs.Fields( "Image ").ActualSize)
End Sub
Private Sub BlobToFile(fld As ADODB.Field, FileName As String, Optional ChunkSize As Long )
Dim fnum As Integer, bytesLeft As Long, bytes As Long
Dim tmp() As Byte
If (fld.Attributes And adFldLong) = 0 Then
Err.Raise 1001, , "Field doesn 't support the GetChunk method. "
End If
If Dir$(FileName) <> " " Then Kill FileName
fnum = FreeFile
Open FileName For Binary As fnum
bytesLeft = fld.ActualSize
Do While bytesLeft
bytes = bytesLeft
If bytes > ChunkSize Then bytes = ChunkSize
查到的资料:
如果你想要把二进制数据插入到一个字符类型的字段中(例如BLOB)，下列字符必须由转义序列表示：
NUL
ASCII 0，你应该用 “\0”（一个反斜线和一个ASCII “0”字符）表示它。
\
ASCII 92，反斜线。需要用 “\\” 表示。
'
ASCII 39，单引号。需要用 “\ '” 表示。
"
ASCII 34，双引号。需要用 “\ "” 表示。
-----------------------------------
问题是:请问我如何转义二进制数据.下面里面看不出来有什么引号之类的..
二进制数据是这样格式:????āā怀怀 ????????????????????┝???‖???????┰?Ｈ???????????????????????????????????????????！?ā?āā ā????????????ā???????慑??脲??????戳色???┚??????????呓噕塗婙摣晥桧橩瑳癵硷穹蒃蚅袇誉鎒閔鞖馘???????????????????????笠????āāāā ā?????????????w???ㄡ?允愇?㈢?????刳?牢??????????????半啔坖奘捚敤杦楨獪畴睶祸艺蒃蚅袇誉鎒閔鞖馘???????????????????????笠?ú?????????薿?饠???????棈????卺???罊?櫎???????坳??汖???駹??鋏???｝?????龗???貦?蔽蠟..........
------解决方案--------------------
参考：http://bbs.xplore.cn/viewthread.php?tid=2507
------解决方案--------------------
我以前回答过多次此类问题，但2006年的贴子不能查到了。
你自己修改一下.
VB把文件存入数据库IMAGE字段
Sub Savepic(FileName As String, IndexNumber As Long)
Dim DcnNWind As New ADODB.Connection
Dim rs As ADODB.Recordset
Set rs = New ADODB.Recordset
DcnNWind.CursorLocation = adUseClient
DcnNWind.Open "Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=CUSTOM;Data Source=SERVER "
rs.CursorType = adOpenKeyset
rs.LockType = adLockOptimistic
rs.Open "CustomInfo ", DcnNWind, , adCmdTable
rs.Move (IndexNumber)
Call FileToBlob(rs.Fields( "Image "), FileName, FileLen(FileName))
rs.UpdateBatch adAffectCurrent
End Sub
Private Sub FileToBlob(fld As ADODB.Field, FileName As String, Optional ChunkSize As Long )
Dim fnum As Integer, bytesLeft As Long, bytes As Long
Dim tmp() As Byte
If (fld.Attributes And adFldLong) = 0 Then
Err.Raise 1001, , "Field doesn 't support the GetChunk method. "
End If
fnum = FreeFile
Open FileName For Binary As fnum
bytesLeft = LOF(fnum)
Do While bytesLeft
bytes = bytesLeft
If bytes > ChunkSize Then bytes = ChunkSize
ReDim tmp(1 To bytes) As Byte
Get #1, , tmp
fld.AppendChunk tmp
bytesLeft = bytesLeft - bytes
Loop
Close #fnum
End Sub
VB把文件从IMAGE字段中读到文件中。
Sub loadpic(IndexNumber As Long)
Dim DcnNWind As New ADODB.Connection
Dim rs As ADODB.Recordset
Set rs = New ADODB.Recordset
DcnNWind.CursorLocation = adUseClient
DcnNWind.Open "Provider=SQLOLEDB.1;Integrated Security=SSI;Persist Security Info=False;Initial Catalog=CUSTOM;Data Source=SERVER "
rs.CursorType = adOpenKeyset
rs.LockType = adLockOptimistic
rs.Open "CustomInfo ", DcnNWind, , adCmdTable
rs.Move (IndexNumber)
Call BlobToFile(rs.Fields( "Image "), "c:\windows\temp\tmp.bmp ", rs.Fields( "Image ").ActualSize)
End Sub
Private Sub BlobToFile(fld As ADODB.Field, FileName As String, Optional ChunkSize As Long )
Dim fnum As Integer, bytesLeft As Long, bytes As Long
Dim tmp() As Byte
If (fld.Attributes And adFldLong) = 0 Then
Err.Raise 1001, , "Field doesn 't support the GetChunk method. "
End If
If Dir$(FileName) <> " " Then Kill FileName
fnum = FreeFile
Open FileName For Binary As fnum
bytesLeft = fld.ActualSize
Do While bytesLeft
bytes = bytesLeft
If bytes > ChunkSize Then bytes = ChunkSize