mysql数据库如何存储二进制数据??? 急急急!!!!!!!!

zzysun

mysql数据库如何存储二进制数据,能否给一段代码

welbird

使用blob数据类型
不知道你使用的是odbc？jdbc？dbi？C api？
我就当你是用odbc，语言是用vb

'CREATE CONNECTION OBJECT AND ASSIGN CONNECTION STRING
Dim conn As ADODB.Connection
Set conn = New ADODB.Connection

conn.ConnectionString = "DRIVER={MySQL ODBC 3.51 Driver};" _
            & "SERVER=127.0.0.1;" _
            & "DATABASE=test;" _
            & "UID=testuser;" _
            & "WD=12345;" _
            & "OPTION=" & 1 + 2 + 8 + 32 + 2048 + 16384

conn.CursorLocation = adUseClient
conn.Open

'CREATE TABLE FOR SAMPLE CODE
conn.execute "CREATE TABLE files(" _
           & "file_id SMALLINT UNSIGNED AUTO_INCREMENT NOT NULL PRIMARY KEY," _
           & "file_name VARCHAR(64) NOT NULL," _
           & "file_size MEDIUMINT UNSIGNED NOT NULL," _
           & "file MEDIUMBLOB NOT NULL)"

'OPEN RECORDSET FOR WRITING
Dim rs As ADODB.Recordset
Set rs = New ADODB.Recordset

Dim mystream As ADODB.Stream
Set mystream = New ADODB.Stream

mystream.Type = adTypeBinary

rs.Open "SELECT * FROM files WHERE 1=0", conn, adOpenStatic, adLockOptimistic

rs.AddNew

mystream.Open
mystream.LoadFromFile "c:\myimage.gif"

rs!file_name = "myimage.gif"
rs!file_size = mystream.size
rs!file = mystream.read
rs.Update
mystream.Close
rs.Close

'OPEN RECORDSET TO READ BLOB
rs.Open "Select * from files WHERE files.file_id = 1", conn
mystream.Open
mystream.Write rs!File
mystream.SaveToFile "c:\newimage.gif", adSaveCreateOverWrite
mystream.close
rs.close

'OPEN RECORDSET FOR UPDATE OF BLOB COLUMN
rs.Open "Select * from files WHERE files.file_id = 1", conn, adOpenStatic, adLockOptimistic
mystream.Open
mystream.LoadFromFile "c:\updateimage.gif"
rs!file = mystream.Read
rs.Update

mystream.Close
rs.Close

'OPEN RECORDSET TO READ UPDATED IMAGE
rs.Open "Select * from files WHERE files.file_id = 1", conn
mystream.Open
mystream.Write rs!file
mystream.SaveToFile "c:\newupdatedimage.gif", adSaveCreateOverWrite

mystream.Close
rs.Close

conn.execute "DROP TABLE files"
conn.Close
msgbox "Success! Check your C:\ directory for newimage.gif and newupdatedimage.gif"

zzysun

我用的是C API