纯编码实现Access数据库的建立或压缩

2006-06-17 00:00:00 作者：

<% 
'#######以下是一个类文件，下面的注解是调用类的方法################################################ 
'# 注意：如果系统不支持建立Scripting.FileSystemObject对象，那么数据库压缩功能将无法使用 
'# Access 数据库类 
'# CreateDbFile 建立一个Access 数据库文件 
'# CompactDatabase 压缩一个Access 数据库文件 
'# 建立对象方法: 
'# Set a = New DatabaseTools 
'# by (萧寒雪) s.f. 
'#########################################################################################

Class DatabaseTools

Public function CreateDBfile(byVal dbFileName,byVal DbVer,byVal SavePath) 
'建立数据库文件 
'If DbVer is 0 Then Create Access97 dbFile 
'If DbVer is 1 Then Create Access2000 dbFile 
On error resume Next 
If Right(SavePath,1)<>"\" Or Right(SavePath,1)<>"/" Then SavePath = Trim(SavePath) & "\" 
If Left(dbFileName,1)="\" Or Left(dbFileName,1)="/" Then dbFileName = Trim(Mid(dbFileName,2,Len(dbFileName))) 
If DbExists(SavePath & dbFileName) Then 
Response.Write ("对不起，该数据库已经存在!") 
CreateDBfile = False 
Else 
Dim Ca 
Set Ca = Server.CreateObject("ADOX.Catalog") 
If Err.number<>0 Then 
Response.Write ("无法建立，请检查错误信息 
" & Err.number & " 
" & Err.Description) 
Err.Clear 
Exit function 
End If 
If DbVer=0 Then 
call Ca.Create("Provider=Microsoft.Jet.OLEDB.3.51;Data Source=" & SavePath & dbFileName) 
Else 
call Ca.Create("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & SavePath & dbFileName) 
End If 
Set Ca = Nothing 
CreateDBfile = True 
End If 
End function

Public function CompactDatabase(byVal dbFileName,byVal DbVer,byVal SavePath) 
'压缩数据库文件 
'0 为access 97 
'1 为access 2000 
On Error resume next 
If Right(SavePath,1)<>"\" Or Right(SavePath,1)<>"/" Then SavePath = Trim(SavePath) & "\" 
If Left(dbFileName,1)="\" Or Left(dbFileName,1)="/" Then dbFileName = Trim(Mid(dbFileName,2,Len(dbFileName))) 
If DbExists(SavePath & dbFileName) Then 
Response.Write ("对不起，该数据库已经存在!") 
CompactDatabase = False 
Else 
Dim Cd 
Set Cd =Server.CreateObject("JRO.JetEngine") 
If Err.number<>0 Then 
Response.Write ("无法压缩，请检查错误信息 
" & Err.number & " 
" & Err.Description) 
Err.Clear 
Exit function 
End If 
If DbVer=0 Then 
call Cd.CompactDatabase("Provider=Microsoft.Jet.OLEDB.3.51;Data Source=" & SavePath & dbFileName,"Provider=Microsoft.Jet.OLEDB.3.51;Data 
Source=" & SavePath & dbFileName & ".bak.mdb;Jet OLEDB;Encrypt Database=True") 
Else 
call Cd.CompactDatabase("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & 
SavePath & dbFileName,"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & 
SavePath & dbFileName & ".bak.mdb;Jet OLEDB;Encrypt Database=True") 
End If 
'删除旧的数据库文件 
call DeleteFile(SavePath & dbFileName) 
'将压缩后的数据库文件还原 
call RenameFile(SavePath & dbFileName & ".bak.mdb",SavePath & dbFileName) 
Set Cd = False 
CompactDatabase = True 
End If 
end function

Public function DbExists(byVal dbPath) 
'查找数据库文件是否存在 
On Error resume Next 
Dim c 
Set c = Server.CreateObject("ADODB.Connection") 
c.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & dbPath 
If Err.number<>0 Then 
Err.Clear 
DbExists = false 
else 
DbExists = True 
End If 
set c = nothing 
End function

Public function AppPath() 
'取当前真实路径 
AppPath = Server.MapPath("./") 
End function

Public function AppName() 
'取当前程序名称 
AppName = Mid(Request.ServerVariables("SCRIPT_NAME"),(InStrRev(Request.ServerVariables("SCRIPT_NAME") ,"/",-1,1))+1,Len(Request.ServerVariables("SCRIPT_NAME"))) 
End Function

Public function DeleteFile(filespec) 
'删除一个文件 
Dim fso 
Set fso = CreateObject("Scripting.FileSystemObject") 
If Err.number<>0 Then 
Response.Write("删除文件发生错误!请查看错误信息 
" & Err.number & " 
" & Err.Description) 
Err.Clear 
DeleteFile = False 
End If 
call fso.DeleteFile(filespec) 
Set fso = Nothing 
DeleteFile = True 
End function

Public function RenameFile(filespec1,filespec2) 
'修改一个文件 
Dim fso 
Set fso = CreateObject("Scripting.FileSystemObject") 
If Err.number<>0 Then 
Response.Write("修改文件名时发生错误!请查看错误信息 
" & Err.number & " 
" & Err.Description) 
Err.Clear 
RenameFile = False 
End If 
call fso.CopyFile(filespec1,filespec2,True) 
call fso.DeleteFile(filespec1) 
Set fso = Nothing 
RenameFile = True 
End function

End Class 
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