New Perspectives on XML, 2nd Edition Tutorial 9B 1

USING XML AS A DATA SOURCE

TUTORIAL 9B

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THE DATA SOURCE OBJECT

• ActiveX Data Objects (ADO) is a data-access technology developed by Microsoft. ADO allows you to work with the Data Source Object by applying a method or by changing one of the properties of the DSO.

• The syntax for applying a method is:

id.recordset.method()

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THE DATA SOURCE OBJECT

• Here, id is the name of the data island in the Web document and method is the name of the method supported by ADO.

• There are several methods that can be applied to DSOs.

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THE DATA SOURCE OBJECT

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THE DATA SOURCE OBJECT

• For example, if you want to display the last record in a DSO whose id is “staffInfo”, run the following method:

staffInfo.recordset.moveLast( )

• The simplest way to run a method is to assign the method to the onClick event handler of a <button> as shown below: <button onClick=“staffInfo.recordset.moveLast( )”>

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THE DATA SOURCE OBJECT

• When the user clicks the button, the browser runs the command indicated by the onClick event handler, displaying the last record.

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ASSIGNING A RECORDSET METHOD

Practice

• P. 530-531• P. 533

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TABLE BINDING

• Using table data binding, each record can be displayed in a different row of a table. The syntax is:

<table datasrc=“#id”> <tr> <td><span datafld=“field1”></span></td> <td><span datafld=“field2”></span></td> </tr> </table>

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TABLE BINDING

• In the example, id is the name of the data island, field1, field2 are the fields from the recordset.

Practice

• P. 534-535• P. 536-537

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TABLE PAGES

• As you add more records to your XML document, a table can become long and unwieldy. One way to fix this is to give the user the option of limiting the number of records displayed at any one time.

• The user can then move forward of backward that number of records at a time. This is called paging.

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TABLE PAGES

• To specify the page size, add the dataPageSize attribute to the <table> tag:

datapagesize=“number”

• number is the number of records you want displayed in a single page.

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NAVIGATING A TABLE PAGE

• A unique identifier must be assigned to a table using the ID attribute before writing a command to navigate a table page. The syntax to do this is:

<table id=“id”>

• Here, id is the name you assign to the table object.

• This is needed because the commands to navigate the table pages act on the table itself not the recordset.

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TABLE METHODS AND PROPERTIES

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TABLE METHODS AND PROPERTIES

• To run these commands, add the command to the onClick event handler of a <button> tag. For example, to move to the last page in a data table named “StaffTable”, you enter the attribute:

onClick=“staffTable.lastPage( )”

Practice

• P. 538-539• P. 540• P. 541

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HIERARCHICAL RECORDSETS

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HIERARCHICAL RECORDSETS

• To bind the Employee fields in the previous slide to a table, you create a table as follows:

<table datasrc=“#staffInfo” datafld=“employee”> <tr> <td><span datafld=“name”></span></td> <td><span datafld=“position”></span></td> <td><span datafld=“phone”></span></td> … </tr> </table>

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THE FINAL WEB PAGE

Practice

• P. 543• P. 545-547• P. 547-548• P. 549

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