DB Tables Backup using ASP, OO4O and Oracle's Export Utility by Jenny Corpus
This is a simple ASP program that allows the user to create a backup copy of a DB user's tables. It uses Oracle Objects for OLE (OO4O) for database access to Oracle and for the backup function, Oracle's Export Utility program is used. This code assumes that the web server has the following installations: 1.Oracle Net8 2.Oracle Object for OLE
Here is the code:
'************** Start**********************' File: Export.asp <%@ Language=VBScript %> <%Option Explicit%> <%
dim OraDatabase 'Oracle Database object dim OraDynaset 'Oracle Dynaset object
dim sExpPath 'physical path of Export program in the web server dim sExpFileNm 'physical path and file name of the Export file to be created 'physical path must be existing in the web server
sExpPath = "d:\oracle\ora817\bin\exp.exe" 'set the location of the export program sExpFileNm = "d:\Test\EXPDAT.DMP" 'set the name of the Export file to be created
'Main Procedure Sub Main()
if Request.Form("hidSubmit")="1" then 'Check if the form is submitted Call DoExport() 'Execute Export program end if
Call Header() 'Write the Header Call Body() 'Write the Body Call Footer() 'Write the Footer
End Sub
'Export Procedure Sub DoExport() Dim nCount 'number of rows Dim nCtr 'counter for the loop Dim sTabList 'list of selected Tables to be exported Dim sTabNm 'selected Table Name
nCount = int(Request.Form("hidCount")) 'Get the total number of rows
'Check each checkbox of it is selected For nCtr=1 to nCount if Request.Form("chkExport" & nCtr) = "on" then 'Check if checkbox is checked sTabNm = Request.Form("hidTabNm" & nCtr) 'Get the selected Table Name sTabList = sTabList & "," & sTabNm 'Place selected name in the list of tables to be exported end if next
sTabNm = Right(sTabList, Len(sTabList) - 1) 'Remove the comma at the start of the list
Call ExportTables(sTabList) 'Export the tables
End Sub
'******************************** 'Execute the Export program Sub ExportTables(sTabNm) dim wsh 'WScript object dim sCommand 'Export command dim sConnection 'DB connection string
'Make the DB Connection string sConnection = AppDic("UserName") & "/" & AppDic("Password") & "@" & AppDic("DBName")
'Create the Export command sCommand = sExpPath & " " & sConnection & " tables=" & sTabNm & " File=" & sExpFileNm
'Create the WScript Object set wsh = server.createobject("WScript.Shell")
'Run the Export command wsh.run sCommand
End Sub '*********************************
'Writes the HTML Header Sub Header() %> <HTML> <HEAD> <meta HTTP-EQUIV="Content-Type" content="text/html; charset=iso-8859-1"> </HEAD> <SCRIPT language=javascript>
//Checks or Unchecks all the checkboxes function CheckAll() { var nCount; var sChkName; var nCheck
nCount = document.forms[0].hidCount.value; if (document.forms[0].btnCheck.value=="Check") { nCheck=1; document.forms[0].btnCheck.value="UnCheck"; } else { nCheck=2; document.forms[0].btnCheck.value="Check"; };
for (var i=1; i <= nCount; i++) { sChkName="chkExport" + i; if (nCheck==1) { document.forms[0].item(sChkName).checked=true; } else { document.forms[0].item(sChkName).checked=false; }; }; };
//submit form function Export() { document.forms[0].hidSubmit.value=1; document.forms[0].method='POST'; document.forms[0].submit(); }; </SCRIPT> <BODY> <% End Sub
'Retrieve tables of user from DB Function GetResults Dim sqlStatement
' Get the reference to the OraDatabase object from the pool set OraDatabase = OraSession.getDatabaseFromPool(10)
if Oradatabase is nothing then 'Check if connection is successful GetResults=-1 Exit Function else 'Make the select statement sqlStatement = "SELECT table_name, tablespace_name FROM user_tables "
'Execute the select statement, store it in the Dynaset set OraDynaset = OraDatabase.CreateDynaset(sqlStatement, cint(0)) if OraDynaset.RecordCount < 1 then 'Check if there are records retrieved GetResults=-2 Exit Function else GetResults=1 End if end if
End Function
'Displays error message on the HTML Sub DisplayError(nError) Dim strWrite
Select Case nError Case -1 strWrite="No Connection." Case -2 strWrite="No records retrieved" end select
Response.Write strWrite
End Sub
'Displays the retrieved rows in an HTML table Sub DisplayTable() dim strWrite 'string to write dim nCount 'Number of rows retrieved
%> <FORM Method=POST > <TABLE border=1> <TR> <TD><INPUT type='button' name="btnCheck" value="Check" onclick="Javascript:CheckAll()"></TD> <TD nowrap> Table Name </TD> <TD nowrap> Tablespace Name </TD> </TR> <% nCount = 0 Do Until OraDynaset.EOF nCount = nCount + 1 strwrite = "<TR>" strwrite = strwrite & "<TD nowrap><INPUT type='hidden' name='hidTabNm" & nCount &"' value=" & OraDynaset.Fields("table_name") & ">" strwrite = strwrite & "<INPUT type='checkbox' name='chkExport" & nCount & "' ></TD>" strwrite = strwrite & "<TD nowrap>" & OraDynaset.Fields("table_name") & "</TD>" strwrite = strwrite & "<TD nowrap>" & OraDynaset.Fields("tablespace_name") & "</TD>" strwrite = strwrite & "</TR>" & chr(13) & chr(10) Response.Write strWrite
OraDynaset.MoveNext Loop
%> </TABLE> <BR> <INPUT type='button' name='btnExport' value="Export" onclick="JavaScript:Export()"> <INPUT type='hidden' name='hidSubmit' value=0> <INPUT type='hidden' name='hidCount' value=<%=nCount%> > </FORM>
<%
End Sub
'Displays the Body of the HTML Sub Body() Dim nRet 'Return value from GetResults(); 1=OK, -1 or -2=ERROR
'Get the rows from DB nRet=GetResults() If nRet <> 1 then 'Check if there is an error Call DisplayError(nRet) else Call DisplayTable end if
End Sub
'Writes the Footer of the HTML Sub Footer()
'Set the Oracle objects to nothing Set OraDatabase=Nothing Set OraDynaset=Nothing
%> </BODY> </HTML> <% End sub
'****START of server-side procedures**** Call Main()
%> '************** End********************'
'************** Start**********************' 'File: Global.asa
<OBJECT RUNAT="Server" SCOPE="Application" ID="AppDic" PROGID="Scripting.Dictionary"></OBJECT> <OBJECT RUNAT=Server SCOPE=Application ID=OraSession PROGID="OracleInProcServer.XOraSession"></OBJECT> <SCRIPT LANGUAGE=VBScript RUNAT=Server>
Sub Application_OnStart AppDic.Add "DBName","orcl" 'Registered service name in the SQL Net AppDic.Add "UserName","scott" 'User name AppDic.Add "Password","tiger" 'Password
OraSession.CreateDatabasePool 20, 100, 600, AppDic("DBName"), AppDic("UserName") & "/" & AppDic("Password"), 0
End Sub
Sub Application_OnEnd
'Destroys global pool of connections. OraSession.DestroyDatabasePool
End Sub
</SCRIPT>
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