Dim SQLDB As New ADODB.Connection
Dim SQLConnect As String
SQLConnect = "driver={SQL Server};Server=server;Uid=sa;Password=;DataBase=student"
SQLDB.ConnectionString = SQLConnect
SQLDB.ConnectionTimeout = 10
SQLDB.Open
Set imagers = SQLDB.Execute("select photo from student where nameid='001'")
studentRS.Open "select * from student1", SQLDB, adOpenKeyset, adLockOptimistic
studentRS.addnew
studentrs!photo=imagers!photo
studentrs.update
photo 字段为image类型,怎么取出为null,但在student表中有此条记录,photo值并不为空?如为binary或varbinary就可取出,如为这两种类型就不能被image控件绑定
如何解决?
望专家告知!
Dim SQLConnect As String
SQLConnect = "driver={SQL Server};Server=server;Uid=sa;Password=;DataBase=student"
SQLDB.ConnectionString = SQLConnect
SQLDB.ConnectionTimeout = 10
SQLDB.Open
Set imagers = SQLDB.Execute("select photo from student where nameid='001'")
studentRS.Open "select * from student1", SQLDB, adOpenKeyset, adLockOptimistic
studentRS.addnew
studentrs!photo=imagers!photo
studentrs.update
photo 字段为image类型,怎么取出为null,但在student表中有此条记录,photo值并不为空?如为binary或varbinary就可取出,如为这两种类型就不能被image控件绑定
如何解决?
望专家告知!
解决方案 »
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'**
'** 使用 ADODB.Stream 保存/读取文件到数据库
'** 引用 Microsoft ActiveX Data Objects 2.5 Library 及以上版本
'**
'** ----- 数据库连接字符串模板 ---------------------------------------
'** ACCESS数据库
'** iConcStr = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False" & _
'** ";Data Source=数据库名"
'**
'** SQL数据库
'** iConcStr = "Provider=SQLOLEDB.1;Persist Security Info=True;" & _
'** "User ID=用户名;Password=密码;Initial Catalog=数据库名;Data Source=SQL服务器名"
'**'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
'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\img.mdb"
iConcstr = "Provider=SQLOLEDB.1;Persist Security Info=True;" & _
"User ID=sa;Password=;Initial Catalog=test;Data Source=yang"
Dim iConc As ADODB.Connection
Set iConc = New ADODB.Connection
iConc.Open iConcstr
'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 + "\init.doc"
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 SubSub s_ReadFile()
Dim iStm As ADODB.Stream
Dim iRe As ADODB.Recordset
Dim iConcstr As String
'数据库连接字符串
'iConc = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False" & _
' ";Data Source=F:\csdn_vb\database\保存图片\img.mdb"
iConcstr = "Provider=SQLOLEDB.1;Persist Security Info=True;" & _
"User ID=sa;Password=;Initial Catalog=test;Data Source=yang"
Dim iConc As ADODB.Connection
Set iConc = New ADODB.Connection
iConc.Open iConcstr
'打开表
Set iRe = New ADODB.Recordset
iRe.Open "select * from img", iConc, adOpenKeyset, adLockReadOnly
iRe.Filter = "id=2" '比如单击datagrid后找到id=3的纪录
'保存到文件
Set iStm = New ADODB.Stream
With iStm
.Mode = adModeReadWrite
.Type = adTypeBinary
.Open
.Write iRe("photo")
.SaveToFile App.Path & "\com.doc"
End With
OLE1.SourceDoc = "c:\\com.doc"
OLE1.Action = 1 'use the old action method
OLE1.SizeMode = vbOLESizeAuttoSize '调节对象大小使其正好充满OLE容器控件 'Picture1.Picture = LoadPicture("c:\tesd.bmp")
'关闭对象
iRe.Close
iStm.Close
End SubPrivate Sub Command1_Click()
Call s_ReadFile
End SubPrivate Sub Command2_Click()
Call s_SaveFile
End Sub
有无更好的方法?为什么binary或varbinary就可取出?
并且怎么把它取出的值,表示成十六进制的形式呀(就像是在“查询分析器”里面的样子)?
望答
Option Explicit'工程->引用->Microsoft ActiveX Data Object 2.6 Library (后面为版本号)
Dim cn As New ADODB.Connection, rs As New ADODB.Recordset'保存
Private Sub Command1_Click()
Dim stmCon As New Stream
stmCon.Type = adTypeBinary
stmCon.Open
stmCon.LoadFromFile "C:\bb.bmp"
If rs.State = adStateOpen Then rs.Close
rs.Open "SELECT * FROM TABLENAME", cn, adOpenDynamic, adLockOptimistic rs.AddNew
rs!ID = "12"
rs!Name = "bb"
rs.Fields("PHOTO") = stmCon.Read
rs.Update
stmCon.Close
Set stmCon = Nothing
End Sub'打开
Private Sub Command2_Click()
Dim stmCon As New Stream
If rs.State = adStateOpen Then rs.Close
rs.Open "SELECT * FROM TABLENAME", cn, adOpenForwardOnly, adLockReadOnly
If Not rs.EOF Then
stmCon.Type = adTypeBinary
stmCon.Open
stmCon.Write (rs.Fields("PHOTO").Value)
stmCon.SaveToFile "C:\aa.bmp", adSaveCreateOverWrite
End If Image1.Picture = LoadPicture("C:\aa.bmp")
End SubPrivate Sub Command3_Click()
rs.Open "SELECT * FROM TEST", cn, 3, 3
End SubPrivate Sub Form_Load()
'On Error GoTo Errhandle
'cn.ConnectionString = "Driver={SQL Server};SERVER=DataServer;DATABASE=zxzx;UID=information;PWD=information*&#"
'cn.ConnectionString = "DBQ=D:\My Documents\db2.mdb;DefaultDir=" & _
App.Path & ";Driver={Microsoft Access Driver (*.mdb)};" & _
"DriverId=25;FIL=MS Access;ImplicitCommitSync=Yes;" & _
"MaxBufferSize=512;MaxScanRows=8;PageTimeout=5;SafeTransactions=0;" & _
"Threads=3;UID=ADMIN;UserCommitSync=Yes;PWD=;"
'cn.ConnectionString = "Driver={MySQL};Option=262144;port=1024;stmt=;Server=192.168.2.126;DataBase=mysql;User=root;Password="
cn.ConnectionString = "DSN=Mysql;UID=root;PWD="
cn.Open
Exit Sub
Errhandle:
MsgBox Err.Description, vbExclamation
End SubPrivate Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
On Error Resume Next
rs.Close
Set rs = Nothing
cn.Close
Set cn = Nothing
End Sub