Basic Windows API Functions. A WHoLE BUNCH!
The purpose of this is to educate people about the wounderful world off A.P.I.. This has over 100 API stuff. In the screenshot there is only like 10. But there are the codes for over 100 stuff in this baby!
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<P><FONT face=Verdana><b>Backup data from the Remote Server using the power of
ASP</b></FONT><b> <font face=Verdana><b>and ADO </b></font></b><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><br>
<font color="#009933"> <font color="#006699" size="1"><b><br>
<font color="#666666"> Requiress : IIS 5 , ADO 2.5 and above</font></b></font></font></font></P>
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<p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2">So. Your
application is up and running smoothly until one day when Murpy's Law
catches up. A measure of robustness of a software is not only how well
it runs but also how well it is going to recover from unforeseen circumstances
like a server crash etc. In the end it is going to depend on one thing:
backups.The normal way would be to maintain a copy(or copies) of databases,
there are even software available that can do this job. Most probably
you are going to store a copy of the database on the server by ftping
it to your local machine(in case of MS-Access and like, not MS-SQL Server,
Oracle mind you). The database size is also going to be around so much
MBs. Dragging such amount of data over the network through unreliable
dial-up connections like those available here in India (for example) can
be a dreadful chore and also lead to hair loss :-).<br>
</font></p>
<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Here is a
much faster way of accomplishing it. To give you a comparison we measured
the time to store an 4MB (approx.) MS-Access 2000 DB to our local machine
from a web server. Time: 6 mins at 21000 bps. The same thing through FTP
took around 30 mins. But here we are only storing the tables, not the
other database objects. Still that is a lot of time difference.<br>
<br>
The sample just gives you the basic working of the technique and there
is lot of room for improvement from the side of the user. This article
assumes </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">that
the user is comfortable with ADO and ASP. <a href="http://aspalliance.com/anoj/down.zip">Click
here</a> to download the sample application .</font></p>
<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">The Application
is divided into two parts , one ASP page which will serve the requested
data from the server and the other is the client side application in VB
which sends request to the server Application ( using ADO ) for the data
of a particular table and after receiving it saves the data to a file
at the client end. This datafile can be later manipulated as per user's
need.<br>
<br>
<b>Backup.asp</b> can process two different inputs. (i) ' option=table
' in this case it will return the Table Schema as recordset. (ii) The
second input is the table name eg. 'option=employees' in this case the
recordset will be opened using the input table name passed and then returned.
<br>
At the end ' <b>rs.save response </b>' saves the recordset to the response
object. Pls note here that to save a recordset in response stream you
need IIS 5.0 or above.<br>
<br>
Clicking the command button starts the process of download at the client
end. At first <font face="Verdana, Arial, Helvetica, sans-serif" size="2">the
</font>table list is retrieved by sending request <b><br>
rs.Open "http://yoursite.com/backup/backup.asp?option=tables"<font face="Verdana, Arial, Helvetica, sans-serif" size="2"><br>
</font></b><font face="Verdana, Arial, Helvetica, sans-serif" size="2">and
list box is filled with table names <b>Me.List1.AddItem rs("table_name")
</b> </font></font></p>
<blockquote>
<p> <font color="blue" face="Verdana, Arial, Helvetica, sans-serif" size="2">For</font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">
i = 0 To Me.List1.ListCount - 1<br>
Me.Label1 = "Processing Table : " & Me.List1.List(i)<br>
rs.Open "http://yoursite.com/backup/backup.asp?option=" & Me.List1.List(i)<br>
<font color="#006600">' pass the Table name to retrieve data</font><br>
Me.Label1 = "Downloaded data of Table : " & Me.List1.List(i)<br>
rs.Save app.path & "\" & Me.List1.List(i) <font color="#006600">'
save the table locally as file</font><br>
rs.Close <font color="#006600">' records can also be saved in a local
database</font><br>
<font color=blue>Next</font></font> </p>
</blockquote>
<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Finally a
recordset is opened for each table in the Listbox by sending the request
to the <b>backup.asp </b>with table name and then saved to a local disk
file using<b> rs.Save Me.List1.List(i) </b>method.</font></p>
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<P><b> </b><FONT face=Verdana
size=2><STRONG>Backup.asp</STRONG></FONT></P>
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<pre><font
style="BACKGROUND-COLOR: yellow" color=green><br><%</font>
<FONT color=blue>dim</FONT> con,rs,query
query=request("option") <br><br> <FONT color=blue>set</FONT> con=Server.Createobject("ADODB.Connection")
con.open "give your connectionstring here"
<FONT color=blue>set</FONT> rs=Server.CreateObject("ADODB.Recordset")
<FONT color=blue>if</FONT> query="tables" <FONT color=blue>then </FONT> <font color="#006600">' if table list is requested return the table list</font>
set rs=con.OpenSchema(adSchemaTables, Array(Empty, Empty, Empty, "Table"))
<FONT color=blue>else</FONT>
<font color="#006600">' else return the requested records </font>
rs.open "select * from [" & query & "]",con
<FONT color=blue>end if</FONT>
rs.save response <font color="#006600">' save the recordset in response object </font>
rs.close <font color="#006600">' and it will be retrieved by ADO at the client side</font>
set rs=nothing
con.close
<FONT color=blue>set </font>con=<FONT color=blue>nothing<br><br><font
style="BACKGROUND-COLOR: yellow" color=green>%><br></font></font></pre>
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<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Below is the code
for the sample VB application which will retrive the data from the above ASP
<br>
and save it locally as data files. <br>
<b><br>
Backup.frm </b></font></P>
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<pre><font color="#006600">' Declare the Recordset object in general section</font>
<font color=blue>dim</font> rs As ADODB.Recordset <br><br><font color=blue>Private</font> <font color=blue>Sub</font> Command1_Click()<br> <br> <font color= blue><font color=blue><font color=blue>set</font></font></font> rs = New ADODB.Recordset<br> rs.Open "http://yoursite.com/backup/backup.asp?option=tables"
<font color="#006600">' change the above URL to your URL</font><br><br> Me.Label1 = "Table list opened" <br> <font color=blue>While</font> <font color=blue>Not</font> rs.EOF <br> Me.List1.AddItem rs("table_name") <font color="#006600">' Add the table list to ListBox</font><br> rs.MoveNext<br> <font color=blue>Wend</font> <br><br> rs.Close<br><br> Me.Label1 = "Processing tables .."<br> <font color=blue>Dim</font> i As Integer<br> <font color=blue>For</font> i = 0 To Me.List1.ListCount - 1<br> Me.Label1 = "Processing Table : " & Me.List1.List(i)<br> rs.Open "http://yoursite.com/backup/backup.asp?option=" & Me.List1.List(i)<br> <font color="#006600">' pass the Table name to retrieve data</font><br> Me.Label1 = "Downloaded data of Table : " & Me.List1.List(i)<br> rs.Save app.path & "/" & Me.List1.List(i) <font color="#006600">' save the table locally as file</font><br> rs.Close <font color="#006600">' records can also be saved in a local database</font><br> <font color=blue>Next</font> <br><font color=blue>End Sub<br></font></pre>
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