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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

www.myexceptions.net  网友分享于：2013-01-03  浏览：281次

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。

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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..........

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参考：http://bbs.xplore.cn/viewthread.php?tid=2507

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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

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