Matakuliah : M0492 / Web-based Programming Lanjut
Tahun
: 2007
Web-based Programming Lanjut
Pertemuan 8
ASP and Data on the Client
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Disconnected Recordset
Remote Data Services (RDS)
Data Transfer between Server and Client
Recordset Paging
Disconnected Recordset
• A disconnected recordset is just a normal recordset, but its connection to the
server removed.
• The recordset stands alone, can act like a normal recordset, allowing updates,
additions, and deletions.
• But changes only happen in the recordset, are not reflected in the server.
• The connection to the server can be re-established and the server updated with
any changes
• If data on the server has changed, you can detect these changes. This is called
conflict resolution.
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Remote Data Service (RDS)
• RDS is the name given to the set of services that allows us to handle data on the
client.
• RDS is part of ADO
• Only comes into use when you need to transfer and use data at the client
• Made up from several components
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Remote Data Server
Client
Server
Name:
Client:
Data store
Data
Binding
Manager
OLE-DB
Provider
Data
Client
Cache
Data
Source
Object
DataSpace
Object
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Network
DataFactory
Custom
Object
Component
Web
Server
Remote Data Server
• RDS Server Components
– Data store
– OLE DB Provider
– Two option how work with the data
• The DataFactory
The default server-side component, provides access to data stores
• A Custom Component
A normal COM component that has methods to perform data transfer.
– Web Server, acts as the interface between client and the server.
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Remote Data Server
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RDS Client Components
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DataSpace Object
• goes hand-in-hand with the DataFactory or a Custom Component, provides the client-side
part of the equation.
• DataSpace is a proxy object, responsible for the communication with the server, providing
the channel through which data is moved.
• Created by using an HTML <OBJECT> tag.
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Data Source Object (DSO)
• Responsible for storing data on the client, contains an ADO Recordset and work together with
the Client Data Cache to manage the data
• Created by using an HTML <OBJECT> tag
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Client Data Cache
• The client cursor service managing the data on the client
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Data Binding Manager
• Create the link (binding) between the HTML controls and the DSO. Perform by specifying the
DATASRC and DATAFLD attributes of certain HTML controls.
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Remote Data Server
• Browser Support for RDS
• Only works in Microsoft browsers
• Fully supported on Microsoft Internet Explorer 4.0 and above
• Be aware, clients accessing application that rely on RDS might have
different versions with the server. For example, IE4 shipped with RDS 1.5,
while IE5, Office2000 and Visual Studio 6 with RDS 2.0, Windows 2000 with
RDS 2.5
• Two ways to take care of compability problem :
– Make sure all users upgrade to the latest version of RDS.
– Specify the Data Factory Mode when connecting to data source. Specify
which version to use.
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Remote Data Server
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Data Source Objects
Is a client-side object that stores and manages the data once it is on the client.
Several different DSO :
– Tabular Data Control (TDC) is design to manipulate data held in a tabular or delimited
from text files.
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Remote Data Service Data Control is design to connect to OLEDB data stores, and can
specify where to connect to as well as which data to return
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Java DataBase Connector is a Java applet that allows connection to data stores
through the Java DataBase Control (JDBC).
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Microsoft HTML (MSHTML) DSO takes data marked up in HTML and uses this as the
source of the data.
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XML DSO uses XML data, and can be used for either well-structured or arbitrarily
structured XML.
Tabular Data Control
• TDC is the simplest DSO, useful for small amounts of data that will be read-only.
• Created by placing an <OBJECT> tag
<OBJECT CLASSID=“clsid:333C7BC4-460F-11D0BC04-0080C7055A83”
ID=“dsoEmployee” WIDTH=“0” HEIGHT=“0”>
<PARAM NAME=“DataURL” Value=“Employee.csv”>
</OBJECT>
example of data in Comma Separated Values (CSV):
PMA42628M,"Paolo","M","Accorti",13,35,"0877",1992-08-27 00:00:00
PSA89086M,"Pedro","S","Afonso",14,89,"1389",1990-12-24 00:00:00
VPA30890F,"Victoria","P","Ashworth",6,140,"0877",1990-09-13 00:00:00
H-B39728F,"Helen"," ","Bennett",12,35,"0877",1989-09-21 00:00:00
L-B31947F,"Lesley"," ","Brown",7,120,"0877",1991-02-13 00:00:00
F-C16315M,"Francisco"," ","Chang",4,227,"9952",1990-11-03 00:00:00
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RDS Data Control
• RDS Data Control provides access to normal data stores, as opposed to flat files.
• Most often used to connect to SQL database to retrieve data from tables queries
or stored procedures
• Allow data to be update
• Created using an HTML <OBJECT> tag
<OBJECT CLASSID=“clsid:BD96C556-65A3-11D0-983A-00C04FC29E33”
ID=“dsoAuthors” WIDTH=“0” HEIGHT=“0”>
<PARAM NAME=“Connect” Value=“Connection String”>
<PARAM NAME=“Server” Value=“Server Name”>
<PARAM NAME=“SQL” Value=“Query Text”>
</OBJECT>
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RDS Data Control
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Example :
<OBJECT CLASSID=“clsid:BD96C556-65A3-11D0-983A-00C04FC29E33”
ID=“dsoAuthors” WIDTH=“0” HEIGHT=“0”>
<PARAM NAME=“Connect” Value=“DSN=pubs”>
<PARAM NAME=“Server” Value=“W2000”>
<PARAM NAME=“SQL” Value=“SELECT * FROM Authors”>
</OBJECT>
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ADO 2.5 has a new URL property that allows to use file as the source of data.
<OBJECT CLASSID=“clsid:BD96C556-65A3-11D0-983A-00C04FC29E33”
ID=“dsoAuthors” WIDTH=“0” HEIGHT=“0”>
<PARAM NAME=“URL” Value=“DataPage.asp”>
</OBJECT>
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RDS Data Control
• The DataPage.asp file could contain the following VBScript code :
<!-- #include file="dataconn.inc" -->
<%
Dim rsData
Set rsData = Server.CreateObject (“ADODB.Recordset”)
rsData.Open “SELECT * FROM Authors”, strConn
rsData.Save Response, 1
rsData.Close
Set rsData = Nothing
%>
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‘ adPersistXML= 1
MSHTML Data Control
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MSHTML is rather unusual – is part of IE
Allows to have a data source based on HTML.
MSHTML is not a form that naturally use for data storage
MSHTML could be useful if you have a lot of HTML pages that do contain some
data.
• MSHTML data control has a Recordset property, but has no methods.
• Created by <OBJECT> tag
<OBJECT ID=“dsoAuthors” DATA=“Authors.html” HEIGHT=“0” WIDTH=“0”>
</OBJECT>
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MSHTML Data Control
• To be able to use the control, your HTML tag must have an ID attribute.
<DIV ID=“au_id”>172-32-1176</DIV>
<SPAN ID=“au_lname”>White</SPAN>
<H1 ID=“au_fname”>Bob</H1>
<PRE ID=“au_id”>213-46-8915</PRE>
<H2 ID=“au_lname”>Green</H2>
<H1 ID=“au_fname”>Cheryl</H1>
• The example above show that the HTML tag names are irrelevant – it’s the ID that
is important.
• The above HTML, would generate 2 rows of data, that looked like this:
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au_id
au_lname
au_fname
172-32-1176
White
Bob
213-46-8915
Green
Cheryl
XML Data Control
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The <XML> tag acts like a data control
Use the <XML> tag in one of two ways:
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The first way, use the SRC attribute to specify the location of the data
<XML ID=“dsoAuthors” SRC=“Authors.xml”></XML>
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Alternatively, embed the XML in the tag
<XML ID=“dsoAuthors”>
<Authors>
<Author>
<au_id>172-32-1176</au_id>
<au_lname>White</au_lname>
<au_fname>Johnson</au_fname>
<phone>408 496-7223</phone>
<contract>True</contract>
</Author>
<Author>
<au_id>213-46-8915</au_id>
<au_lname>Green</au_lname>
<au_fname>Marjorie</au_fname>
<phone>415 986-7020</phone>
<contract>True</contract>
</Author>
</Authors>
</XML>
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Data Binding
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Binding means setting up a relationship between some HTML elements and the data
control.
– The data control is responsible for managing the data and supplying the data to the
HTML element
– The element displays the data on the screen
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To bind an HTML element to a data source, specify two attributes for it:
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DATASRC, to identify the data control that contains the data. Always put a # in front of
the data source name.
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DATAFLD, to identify the field in the data control to bind to. The fields are the names
identifying the columns in the data that the data control manages.
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DATAFORMATS, to indicate how the data in the field should formatted, can be either
HTML or TEXT. The default is TEXT
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Data Binding
<HTML>
<HEAD><TITLE>RDSSingleBinding.asp</TITLE></HEAD>
<BODY>
<H1>Data Binding with RDS<HR></H1>
<OBJECT CLASSID="clsid:BD96C556-65A3-11D0-983A-00C04FC29E33"
ID="dsoAuthors" WIDTH="0" HEIGHT="0">
<PARAM NAME="URL" Value="DataPage.asp">
</OBJECT>
<DIV DATASRC="#dsoAuthors" DATAFLD="au_fname"></DIV>
<DIV DATASRC="#dsoAuthors" DATAFLD="au_lname"></DIV>
</BODY>
</HTML>
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Data Binding
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<HTML>
<HEAD><TITLE>TDCDataFormat.asp</TITLE></HEAD>
<BODY>
<H1>Data Formatting in bound data<HR></H1>
<OBJECT CLASSID="clsid:333C7BC4-460F-11D0-BC04-0080C7055A83"
ID="dsoImages" WIDTH="0" HEIGHT="0">
<PARAM NAME="DataURL" Value="images.csv">
<PARAM NAME = "UseHeader" VALUE = "TRUE">
</OBJECT>
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<TABLE ID="tblData" DATASRC="#dsoImages" BORDER="1">
<THEAD>
<TR>
<TD>Description</TD>
<TD>Image</TD>
</TR>
</THEAD>
<TBODY>
<TR>
<TD><SPAN DATAFLD="Description"></SPAN></TD>
<TD><SPAN DATAFLD="Image" DATAFORMATAS="HTML"></SPAN></TD>
</TR>
</TBODY>
</TABLE>
</BODY>
</HTML>
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Data Binding
Images.csv:
Description,Image
The asian cartoon,<IMG
SRC=images\asian_cartoon.gif>
The Badz-maru,<IMG SRC=images\badtzmaru.gif>
The Businessman,<IMG
SRC=images\biz_man.jpg>
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Table Binding
• Table binding differs from single record binding, because we bind to the TABLE
element. This allows to see more than one record at a time.
• Table binding has one attribute useful to data binding – DATAPAGESIZE. This
determines how many records are shown in the table
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Table Binding
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<HTML>
<HEAD><TITLE>RDSTableBinding.asp</TITLE></HEAD>
<BODY>
<H1>Table Data Binding with RDS<HR></H1>
<OBJECT CLASSID="clsid:BD96C556-65A3-11D0-983A-00C04FC29E33“
ID="dsoData" WIDTH="0" HEIGHT="0">
<PARAM NAME="URL" Value="DataPage.asp">
</OBJECT>
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<TABLE ID="tblData" DATASRC="#dsoData" DATAPAGESIZE="5" >
<THEAD>
<TR>
<TD>au_id</TD>
<TD>au_fname</TD>
<TD>au_lname</TD>
<TD>phone</TD>
<TD>address</TD>
<TD>city</TD>
<TD>state</TD>
<TD>zip</TD>
<TD>contract</TD>
</TR>
</THEAD>
<TBODY>
<TR>
<TD><INPUT TYPE="TEXT" DATAFLD="au_id"></INPUT></TD>
<TD><INPUT TYPE="TEXT" DATAFLD="au_fname"></INPUT></TD>
<TD><INPUT TYPE="TEXT" DATAFLD="au_lname"></INPUT></TD>
<TD><INPUT TYPE="TEXT" DATAFLD="phone"></INPUT></TD>
<TD><INPUT TYPE="TEXT" DATAFLD="address"></INPUT></TD>
<TD><INPUT TYPE="TEXT" DATAFLD="city"></INPUT></TD>
<TD><INPUT TYPE="TEXT" DATAFLD="state"></INPUT></TD>
<TD><INPUT TYPE="TEXT" DATAFLD="zip"></INPUT></TD>
<TD><INPUT TYPE="TEXT" DATAFLD="contract"></INPUT></TD>
</TR>
</TBODY>
</TABLE>
</BODY>
</HTML>
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Table Binding
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Data Transfer Between Server and Client
• Some problem we need to solve
– We need a secure way to retrieve data from a server and use it on the client
– We need a way that allows data to be updated
– We don’t want to compromise flexibility
• The way around this problem is to use components.
• A component allows us to encapsulate all of our data access functionality,
including the source of the data, and ensures that data are only exposed to Web
page.
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Data Transfer Between Server and Client
•
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A server based component
– The component creator uses a programming language that can create COM components
specification. For example, Visual Basic(VB) or Visual C++(VC++).
– The client has a programming language or tool (Such as Microsoft Word or ASP) that know how to
instantiate and use COM components, by following the rules laid down in the COM specification.
Example – creating Book Component
Start Visual Basic and create a new ActiveX DLL project, changing the name of the default class module
to BookTitles.
Next, change the name of the project to Book.
Add a reference that we need in the project.
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Option Explicit
Private mobjConn As ADODB.Connection
Private mrsBooks As ADODB.Recordset
'open the connection and recordset
Public Sub OpenTitles()
Set mobjConn = New ADODB.Connection
Set mrsBooks = New ADODB.Recordset
mobjConn.ConnectionString="Provider=SQLOLEDB; Data Source=hogwartz; Initial Catalog=pubs; User ID=sa; “ & _
letmein"
mobjConn.Open
mrsBooks.CursorLocation = adUseClient
mrsBooks.Open "SELECT * FROM Titles", mobjConn
End Sub
'Close the list
Public Sub CloseTitles()
'Close the recordset
If Not (mrsBooks Is Nothing) Then
If mrsBooks.State = adStateOpen Then
mrsBooks.Close
End If
Set mrsBooks = Nothing
End If
'Close the connection
If Not (mobjConn Is Nothing) Then
mobjConn.Close
Set mobjConn = Nothing
End If
End Sub
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“Password=
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'returns the next title
Public Sub NextTitle(Id As Variant, Title As Variant, Price As Variant, Notes As Variant)
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'Ignore errors and more specifically null values in this demo
On Error Resume Next
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If IsEOF = True Then
Err.Raise vbObject + 1, "BookTitles Component", "End of Cursor"
Exit Sub
End If
'Move to the next title
If Not mrsBooks.EOF Then mrsBooks.MoveNext
End Sub
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Public Function IsEOF() As Boolean
IsEOF = mrsBooks.EOF
End Function
'Copy the fields back to the caller
Id = mrsBooks.Fields("Title_id")
Title = mrsBooks.Fields("Title")
Price = mrsBooks.Fields("Price")
Notes = mrsBooks.Fields("Notes")
If you tried defining the NextTitle procedure Parameter using the String and
Currency types, you’d get an error. Because the Active Scripting engine only
know the Variant type.
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Data Transfer Between Server and Client
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<%
Dim objTitles
Set objTitles = Server.CreateObject("Book.BookTitles")
%>
<HTML><HEAD><TITLE>Titles List</TITLE></HEAD>
<BODY>
<H1>Book Titles</H1><HR>
<P>The following books are currently defined in the pubs database:
<TABLE cellspacing="2" cellpadding="0">
<TR>
<TD bgcolor="#3AC2EF"><STRONG>ID</STRONG></TD>
<TD bgcolor="#3AC2EF"><STRONG>Title</STRONG></TD>
<TD bgcolor="#3AC2EF"><STRONG>Price</STRONG></TD>
<TD bgcolor="#3AC2EF"><STRONG>Notes</STRONG></TD> </TR>
<TR></TR>
<%
Dim strID
Dim strTitle
Dim strPrice
Dim strNotes
'Initialize the list
objTitles.OpenTitles
'Process each author
While objTitles.IsEOF = False
objTitles.NextTitle strID, strTitle, strPrice, strNotes
%>
<TR> <TD bgcolor="#FFFF6C"><%= strID %></TD>
<TD bgcolor="#FFFF6C"><%= strTitle %></TD>
<TD bgcolor="#FFFF6C"><%= strPrice %></TD>
<TD bgcolor="#FFFF6C"><%= strNotes %></TD></TR>
<%
Wend
%>
</TABLE></BODY></HTML>
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Data Transfer Between Server and Client
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Data Transfer Between Server and Client
– Advantages of using Server Side Components
• There are no connection details visible to the user – which gives you a
securer system. The component also has to be specially registered, so
there is the added security restriction.
• You can build components in any COM compliant language. We use VB in
this example, because it’s easy to understand.
• Your components isn’t limited to just returning and updating recordsets
but you could build in lots of logic.
• You could encapsulate all of that conflict resolution code in the Recordset
method, and just return details of any errors. This means your client-side
script is neater and users can’t rip off your hard-worked code.
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Recordset Paging
• Using ADO Paging
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<%
Dim rsData
Dim intPage
Dim intTotalPages
Dim fldF
Dim intRec
Dim strQuote
Dim strScriptName
Dim strConn
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strConn = " Provider = SQLOLEDB; Data Source= Hogwartz; Initial Catalog= pubs; User ID= sa;
Password=letmein"
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strQuote = Chr(34) 'the double quote character
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Set rsData = Server.CreateObject("ADODB.Recordset")
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'set the page size
rsData.PageSize = 10
rsData.CursorLocation = 3 'adUseClient=3
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'Open the data
rsData.Open "Authors", strConn,0,1,2 'adOpenForwardOnly=0, adLockReadOnly=1, adCmdTable=2
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If Request.QueryString("PAGE")="" Then
intPage=1
Else
intPage = CInt( Request.QueryString("PAGE") )
If intPage < 1 then
intPage=1
Else
If intPage > rsData.PageCount Then
intPage = rsData.PageCount
Else
intPage = CInt( Request.QueryString("PAGE") )
End If
End If
End If
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rsData.AbsolutePage = intPage
Response.Write "Page = " & rsData.AbsolutePage & "<BR>"
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Response.Write "<TABLE BORDER=1><THEAD><TR>"
For Each fldF In rsData.Fields
Response.Write "<TD>" & fldF.Name & "</TD>"
Next
Response.Write "</TR></THEAD><TBODY>"
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For intRec = 1 to rsData.PageSize
If Not rsData.EOF Then
Response.Write "<TR>"
For Each fldF In rsData.Fields
Response.Write "<TD>" & fldF.Value & "</TD>"
Next
Response.Write "</TR>"
rsData.MoveNext
End If
Next
Response.Write "</TBODY></TABLE></P>"
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strScriptName = Request.ServerVariables("SCRIPT_NAME")
Response.Write "&nbsp;<A HREF=" & strQuote & strScriptName & "?PAGE=1" & strQuote & "> First Page </A>"
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'Only give an active previous page if there are previous page
If intPage= 1 Then
Response.Write "&nbsp;<SPAN>Previous Page</SPAN>"
Else
Response.Write "&nbsp;<A HREF=" & strQuote & strScriptName & "?PAGE="& intPage - 1 & strQuote & "> Previous Page </A>"
End If
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'Only give an active next page if there are more pages
If intPage = rsData.PageCount Then
Response.Write "&nbsp;<SPAN>Next Page</SPAN>"
Else
Response.Write "&nbsp;<A HREF=" & strQuote & strScriptName & "?PAGE="& intPage + 1 & strQuote & "> Next Page </A>"
End If
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Response.Write "&nbsp;<A HREF=" & strQuote & strScriptName & "?PAGE=" & rsData.PageCount & strQuote & "> LastPage </A>"
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rsData.Close
Set rsData =Nothing
%>
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Recordset Paging
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Recordset Paging
• Using SQL Server
CREATE PROCEDURE usp_PagedAuthors
@iPage
int,
@iPageSize
int
AS
BEGIN
SET NOCOUNT ON
-- disable row counts
-- declare variables
DECLARE @iStart
DECLARE @iEnd
DECLARE @iPageCount
int
int
int
-- start record
-- end record
-- total number of pages
CREATE TABLE #PagedAuthors
-- create the temporary table
(
ID
int
IDENTITY,
au_id
varchar(11) NOT NULL,
au_lname varchar(40)
NOT NULL,
au_fname varchar(20)
NOT NULL,
phone
char(12)
NOT NULL,
address
varchar(20)
NULL,
city
varchar(20)
NULL,
state
char(2)
NULL,
zip
char(5)
NULL,
contract
bit
NOT NULL
)
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-- populate the temporary table
INSERT INTO #PagedAuthors (au_id, au_lname, au_fname, phone, address, city, state, zip, contract)
SELECT au_id, au_lname, au_fname, phone, address, city, state, zip, contract
FROM authors
-- work out how many pages there are in total
SELECT @iPageCount = COUNT(*)
FROM authors
SELECT @iPageCount = 3
-- check the page number
IF @iPage < 1
SELECT @iPage = 1
IF @iPage > @iPageCount
SELECT @iPage = @iPageCount
-- calculate the start and end records
SELECT @iStart = (@iPage - 1) * @iPageSize
SELECT @iEnd = @iStart + @iPageSize +1
-- select only those records that fall within our page
SELECT au_id, au_lname, au_fname, phone, address, city, state, zip, contract
FROM
#PagedAuthors
WHERE ID > @iStart
AND
ID < @iEnd
DROP TABLE #PagedAuthors
SET NOCOUNT OFF -- turn back on record counts
RETURN @iPageCount
END
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Recordset Paging
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<HTML><HEAD><TITLE>SQL Paging</TITLE></HEAD>
<BODY>
<%
Dim rsData
Dim intPage
Dim intLastPage
Dim fldF
Dim cmdAuthors
Dim strQuote
Dim strScriptName
Dim strConn
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strConn="Provider=SQLOLEDB;Data Source=Hogwartz;Initial Catalog=pubs;User ID=sa; Password=letmein"
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strQuote = Chr(34) 'the double quote character
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If Request.QueryString("PAGE")="" Then
intPage=1
Else
intPage = CInt( Request.QueryString("PAGE") )
If intPage < 1 then
intPage=1
End If
End If
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Set cmdAuthors = Server.CreateObject("ADODB.Command")
Set rsData = Server.CreateObject("ADODB.Recordset")
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With cmdAuthors
.ActiveConnection = strConn
.CommandText = "usp_PagedAuthors"
.CommandType = 4 'adCmdStoredProc=4
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.Parameters.Append .CreateParameter("RETURN_VAL", 3, 4) 'adInteger=3 adParamReturnValue=4
.Parameters.Append .CreateParameter("@iPage", 3, 1, 8, intPage) 'adInteger=3 adParamInput=1
.Parameters.Append .CreateParameter("@iPageSize", 3, 1, 8, 10) 'adInteger=3 adParamInput=1
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Set rsData = .Execute
.Execute
33.
34.
End WIth
intLastPage = .Parameters("RETURN_VAL")
35.
Response.Write "Page = " & intPage & "<BR>“
36.
37.
38.
39.
40.
Response.Write "<TABLE BORDER=1><THEAD><TR>"
For Each fldF In rsData.Fields
Response.Write "<TD>" & fldF.Name & "</TD>"
Next
Response.Write "</TR></THEAD><TBODY>"
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
For intRec = 1 to rsData.PageSize
If Not rsData.EOF Then
Response.Write "<TR>"
For Each fldF In rsData.Fields
Response.Write "<TD>" & fldF.Value & "</TD>"
Next
Response.Write "</TR>"
rsData.MoveNext
End If
Next
Response.Write "</TBODY></TABLE></P>"
Bina Nusantara
52.
53.
strScriptName = Request.ServerVariables("SCRIPT_NAME")
Response.Write "&nbsp;<A HREF=" & strQuote & strScriptName & "?PAGE=1" & strQuote & "> First Page </A>"
54.
55.
56.
57.
58.
59.
'Only give an active previous page if there are previous page
If intPage= 1 Then
Response.Write "&nbsp;<SPAN>Previous Page</SPAN>"
Else
Response.Write "&nbsp;<A HREF=" & strQuote & strScriptName & "?PAGE="& intPage - 1 & strQuote & "> Previous Page </A>"
End If
60.
61.
62.
63.
64.
65.
'Only give an active next page if there are more pages
If intPage = intLastPage Then
Response.Write "&nbsp;<SPAN>Next Page</SPAN>"
Else
Response.Write "&nbsp;<A HREF=" & strQuote & strScriptName & "?PAGE="& intPage + 1 & strQuote & "> Next Page </A>"
End If
66.
Response.Write "&nbsp;<A HREF=" & strQuote & strScriptName & "?PAGE=" & intLastPage & strQuote & "> LastPage </A>"
67.
68.
69.
70.
71.
72.
rsData.Close
Set rsData =Nothing
Set cmdAuthors = Nothing
%>
</BODY>
</HTML>
Bina Nusantara
Recordset Paging
Bina Nusantara