'取得文件值
On Error Resume Next
If TxtPath.Text = "" Then
MsgBox "请输入备份文件的路径及文件名!", vbYes + vbExclamation, "提示"
TxtPath.SetFocus
Exit Sub
Else
If InStr(TxtPath.Text, ".mdb") <> 0 Then s = "" Else s = ".mdb"
Backmdb = TxtPath.Text & s
If InStr(Backmdb, "/") <> 0 Then
MsgBox "数据库路径符号输入错误,请重新输入!", vbOKOnly + vbExclamation, "提示"
TxtPath.Text = ""
TxtPath.SetFocus
Exit Sub
End If
k = GetAttr(Backmdb)
If k = "" Then
'实现数据库备份
FileCopy Dbase_Name, Backmdb
MsgBox "数据库备份完成!", vbOKOnly + vbExclamation, "提示"
Exit Sub
Else
ddd = MsgBox("您选择的数据库已经存在,覆盖吗?", vbYesNo + vbCritical, "警告")
If ddd = vbYes Then
FileCopy Dir1.Path & "\" & File1.FileName, BackPath
MsgBox "数据库备份完成!", vbOKOnly + vbExclamation, "提示"
Exit Sub
Else
MsgBox "数据库操作终止!", vbOKOnly + vbExclamation, "提示"
Exit Sub
End If
End If
End If
’数据库还原
If TxtPath.Text = "" Then
MsgBox "请输入源数据库的路径及文件名!", vbYes + vbExclamation, "提示"
TxtPath.SetFocus
Exit Sub
Else
If InStr(TxtPath.Text, ".mdb") <> 0 Then s = "" Else s = ".mdb"
Backmdb = TxtPath.Text & s
If InStr(Backmdb, "/") <> 0 Then
MsgBox "数据库路径符号输入错误,请重新输入!", vbOKOnly + vbExclamation, "提示"
TxtPath.Text = ""
TxtPath.SetFocus
Exit Sub
End If
k = GetAttr(Backmdb)
If k = "" Then
MsgBox "源数据库路径错误,此文件不存在!", vbOKOnly + vbExclamation, "提示"
TxtPath.Text = ""
TxtPath.SetFocus
Exit Sub
Else
ddd = MsgBox("您确定要还原数据库吗?", vbYesNo + vbCritical, "警告")
If ddd = vbYes Then
On Error GoTo NN
FileCopy Backmdb, Dbase_Name
MsgBox "数据库还原完成!", vbOKOnly + vbInformation, "提示"
Exit Sub
Else
MsgBox "数据库操作终止!", vbOKOnly + vbInformation, "提示"
Exit Sub
End If
End If
End If
End If
NN: MsgBox "数据库正在使用,请关闭数据库!", vbOKOnly + vbExclamation, "提示"
End Sub
命令介绍: Backup Database [数据库名] To Disk=[保存路径和名称] With [其他属性]
代码注释:ServerIP :SQLServer所在机器的 IP
jtsg:SQLServer中数据的名称
Public Cn As ADODB.Connection
Set Cn = New ADODB.Connection
strcon = "Provider=SQLOLEDB.1;Password=sa;Persist Security Info=True;User ID=sa;Initial Catalog=jtsg;Data Source=" + ServerIp + ";" + _
"use procedure for prepare=1;auto translate=true;" + _
"use encryption for data=false;tag with column collation when possible=false"
Cn.ConnectionString = strcon
On Error Resume Next
Cn.Open
If Cn.Errors.Count > 0 Then
For i = 0 To Cn.Errors.Count - 1
If Cn.Errors(i).Number = -2147467259 Then
MsgBox "网络不通或服务器未开,请确认后再试", vbOKOnly + vbInformation, "提醒"
Unload Me
Exit Sub
Exit For
End If
Next i
End If
二、完全备份
Private Sub BackupAll()
Cn.Execute "backup database jtsg to disk='" + App.Path + "\backup\myjtsgall.bak' with name='jtsg backup all',description='Full Backup Of jtsg'"
MsgBox "数据完全备份已经完成", vbOKOnly + vbInformation, "提醒"
End Sub
三、差异备份
Private Sub BackupDif()
Cn.Execute "backup database jtsg to disk='" + App.Path + "\backup\myjtsgdif.bak' with differential ,noinit,name='jtsg backup dif',description='Differential Backup Of jtsg'"
MsgBox "数据差异备份已经完成", vbOKOnly + vbInformation, "提醒"
End Sub
四、数据恢复
数据恢复,问题很多,要区分用户的备份形式。一般备份的默认形式是 Append to media,即添加到备份设备已有内容后面。前面介绍的备份方式就这种。还有一种备份形式是 OverWrite,即覆盖设备原有内容。这两中备份形式决定恢复的方式也不一样。
命令介绍: Restore Database [数据库名] From [保存备份的路径和名称] With[其他属性]
代码解释:还原备份的文件可以选择,完全备份和差异备份
Private Sub RestoreData()
Cn.Execute "restore database jtsg from disk='" + App.Path + "\backup\myjtsgall.bak' with FILE=1"
MsgBox "数据恢复已经完成", vbOKOnly + vbInformation, "提醒"
End Sub
.DialogTitle = "数据备份"
.FileName = SQLname
.Filter = "(数据库)*.bak|*.bak"
.CancelError = True
.ShowOpen
.InitDir = App.Path & "\Databackup"
End With
iReturn = fBackupDatabase_a(CommonDialog1.FileName, "jzd")
MsgBox iReturn
Exit Sub
ErrHandler:
' 用户按了“取消”按钮
MsgBox "用户取消备份操作或备份过程中出现错误,备份失败!", 48, "提示"
Exit Sub
End Sub
还原
Private Sub mnudatarevert_Click()
On Error GoTo ErrHandler
Dim i As String
Dim iReturn As String
With CommonDialog1
.DialogTitle = "数据还原"
.FileName = ""
.Filter = "(数据库)*.bak|*.bak"
.CancelError = True
.ShowOpen
.InitDir = App.Path & "\Databackup"
End With
iReturn = fRestoreDatabase_a(CommonDialog1.FileName, "jzd")
MsgBox iReturn
Exit Sub
ErrHandler:
' 用户按了“取消”按钮
MsgBox "用户取消还原操作或还原过程中出现错误,还原失败!", 48, "提示"
Exit Sub
End Sub
'*************************************************************************
'**模 块 名:fBackupDatabase_a
'**描 述:备份数据库,返回出错信息,正常恢复,返回""
'**调 用:fBackupDatabase_a "备份文件名","数据库名"
'**参数说明:
'** sBackUpfileName 恢复后的数据库存放目录
'** sDataBaseName 备份的数据名
'** sIsAddBackup 是否追加到备份文件中
'**说 明:引用Microsoft ActiveX Data Objects 2.x Library
'*************************************************************************
Public Function fBackupDatabase_a(ByVal sBackUpfileName$ _
, ByVal sDataBaseName$ _
, Optional ByVal sIsAddBackup As Boolean = False _
) As String
Dim iDb As ADODB.Connection
Dim iConcStr$, iSql$, iReturn$
Dim uid, pwd, addr As String
'得到还原后的数据库存放目录,如果没有指定,存放到SQL SERVER的DATA目录
If sDataBasePath = "" Then
iSql = "select filename from master..sysfiles"
iRe.Open iSql, iDb, adOpenKeyset, adLockReadOnly
iSql = iRe(0)
iRe.Close
sDataBasePath = Left(iSql, InStrRev(iSql, "\"))
End If
'检查数据库是否存在
If sReplaceExist = False Then
iSql = "select 1 from master..sysdatabases where name='" & sDataBaseName & "'"
iRe.Open iSql, iDb, adOpenKeyset, adLockReadOnly
If iRe.EOF = False Then
iReturn = "数据库已经存在!"
iRe.Close
GoTo lbExit
End If
iRe.Close
End If
备份:
'引用ADO
Private Sub Command1_Click()
Dim backUpFileName As String
With CommonDialog1
.DialogTitle = "保存的文件名"
.Filter = "*.SQL|*.*"
.InitDir = App.Path
.ShowSave
backUpFileName = CommonDialog1.FileName
End With
Dim cn As New ADODB.Connection
cn.ConnectionString = "Provider=SQLOLEDB.1;Persist Security Info=False;User ID=登录名;Password=密码;Initial Catalog=数据库;Data Source=Sql服务器别名"
cn.CursorLocation = adUseClient
cn.Open
cn.Execute ("backup database 数据库 to disk='" & backupdilename & "'")
End Sub
'-------------------------------
恢复:
Private Sub Command2_Click()
Dim backUpFileName As String
With CommonDialog1
.DialogTitle = "保存的文件名"
.Filter = "*.SQL|*.*"
.InitDir = App.Path
.ShowSave
If Dir(CommonDialog1.FileName) <> "" Then
backUpFileName = CommonDialog1.FileName
Else
MsgBox "文件不存在!"
Exit Sub
End If
End With
Dim cn As ADODB.Connection, rs As New ADODB.Recordset
cn.ConnectionString = "Provider=SQLOLEDB.1;Persist Security Info=False;User ID=登录名;Password=密码;Initial Catalog=master;Data Source=Sql服务器别名" '借助master数据库来恢复
cn.CursorLocation = adUseClient
cn.Open
rs.Open "select spid from sysprocesses where dbid=db_id('你的数据库名)", cn
Do While Not rs.EOF
cn.Execute "kill " & rs("spid") '杀掉sql服务器的所有连接,否则会出现:数据库正在使用,无法完成排它操作等等,很重要
rs.MoveNext
Loop
cn.Execute ("restore database 数据库名 from disk='" & backUpFileName & "' with replace")
End Sub