| 1 |
3569
|
berkley
|
<!--
|
| 2 |
|
|
* replication.html
|
| 3 |
|
|
*
|
| 4 |
|
|
* Authors: Chad Berkley
|
| 5 |
|
|
* Copyright: 2000 Regents of the University of California and the
|
| 6 |
|
|
* National Center for Ecological Analysis and Synthesis
|
| 7 |
|
|
* For Details: http://www.nceas.ucsb.edu/
|
| 8 |
|
|
* Created: 2001 January 23
|
| 9 |
|
|
* Version:
|
| 10 |
|
|
* File Info: '$ '
|
| 11 |
|
|
*
|
| 12 |
|
|
*
|
| 13 |
|
|
-->
|
| 14 |
|
|
<HTML>
|
| 15 |
|
|
<HEAD>
|
| 16 |
|
|
<TITLE>Metacat</TITLE>
|
| 17 |
|
|
<link rel="stylesheet" type="text/css" href="@docrooturl@default.css">
|
| 18 |
|
|
</HEAD>
|
| 19 |
|
|
<BODY>
|
| 20 |
|
|
<table width="100%">
|
| 21 |
|
|
<tr>
|
| 22 |
|
|
<td class="tablehead" colspan="2"><p class="label">Paged Query Returns</p></td>
|
| 23 |
|
|
<td class="tablehead" colspan="2" align="right">
|
| 24 |
|
|
<a href="./spatial_option.html">Back</a> | <a href="./metacattour.html">Home</a> |
|
| 25 |
|
|
<a href="./unimplem.html">Next</a>
|
| 26 |
|
|
</td>
|
| 27 |
|
|
</tr>
|
| 28 |
|
|
</table>
|
| 29 |
|
|
|
| 30 |
3570
|
berkley
|
<p>Metacat allows results sets to be broken up into "pages" to aid in the loading
|
| 31 |
|
|
of large result sets and to make the result sets more readable to users. This is
|
| 32 |
|
|
facilitated by the addition of two variables to the parameter list. Pagesize
|
| 33 |
|
|
indicates how many results should be returned for a given page. Pagestart
|
| 34 |
|
|
indicates which page you are currently viewing. These parameters can be
|
| 35 |
|
|
passed to Metacat when a query is submited. </p>
|
| 36 |
|
|
|
| 37 |
|
|
<p>When a paged query is performed, the resultset of that query contains
|
| 38 |
|
|
four extra fields. Pagestart and pagesize are contained in the xml resultset
|
| 39 |
|
|
along with nextpage and previouspage. This allows the xslt tranformation to
|
| 40 |
|
|
include navigational links in the rendered resultset. Here's an example
|
| 41 |
|
|
xml resultset.</p>
|
| 42 |
|
|
|
| 43 |
|
|
<pre>
|
| 44 |
|
|
<resultset>
|
| 45 |
|
|
<pagestart>1</pagestart>
|
| 46 |
|
|
<pagesize>10</pagesize>
|
| 47 |
|
|
<nextpage>2</nextpage>
|
| 48 |
|
|
<previouspage>0</previouspage>
|
| 49 |
|
|
<query>
|
| 50 |
|
|
...
|
| 51 |
|
|
</query>
|
| 52 |
|
|
<document>...</document>
|
| 53 |
|
|
<document>...</document>
|
| 54 |
|
|
</resultset>
|
| 55 |
|
|
</pre>
|
| 56 |
|
|
|
| 57 |
|
|
<p>In the case of the resultset, pagestart will always indicate the page you
|
| 58 |
|
|
are currently viewing.</p>
|
| 59 |
|
|
|
| 60 |
|
|
<p>Here's an example of the rendered result.</p>
|
| 61 |
|
|
|
| 62 |
|
|
<img src="images/pagedquery.jpg"/>
|
| 63 |
|
|
|
| 64 |
|
|
<p>The links to the previous and next pages look like this.</p>
|
| 65 |
|
|
|
| 66 |
|
|
<pre>
|
| 67 |
|
|
<a href="metacat?action=query&operator=INTERSECT&enableediting=false&anyfield=actor&qformat=kepler&pagestart=0&pagesize=10">Previous Page</a>
|
| 68 |
|
|
<a href="metacat?action=query&operator=INTERSECT&enableediting=false&anyfield=actor&qformat=kepler&pagestart=2&pagesize=10">Next Page</a>
|
| 69 |
|
|
</pre>
|
| 70 |
|
|
|
| 71 |
|
|
<p>The important bits of these links are the incremented pagestart parameters.
|
| 72 |
|
|
The rendered page is on page 1 so the previous page is 0 and the next
|
| 73 |
|
|
page is 2. By sequencing through the pages, the user can see the
|
| 74 |
|
|
entire resultset. </p>
|
| 75 |
|
|
|
| 76 |
|
|
<p>The Kepler skin in lib/style/skins/kepler is a good example of how to
|
| 77 |
|
|
render the resultset with paged query returns. The XSLT uses the four extra
|
| 78 |
|
|
fields in the resultset to render the next and previous links. This could
|
| 79 |
|
|
also be used within a non-web application.
|
| 80 |
|
|
</p>
|
| 81 |
|
|
|
| 82 |
3569
|
berkley
|
<br>
|
| 83 |
|
|
<a href="./spatial_option.html">Back</a> | <a href="./metacattour.html">Home</a> |
|
| 84 |
|
|
<a href="./unimplem.html">Next</a>
|
| 85 |
|
|
|
| 86 |
|
|
|
| 87 |
|
|
</BODY>
|
| 88 |
|
|
</HTML>
|