03-ct_sql.sgml

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<!-- $Id: 03-ct_sql.sgml,v 1.1.1.1 2000/04/17 16:40:01 kk Exp $ -->

<sect1>CT_Sql
<p>

The <tt/Session/ class used to contain a bit of SQL to read
and write session data from and to a database. To make sessions
database independent, this SQL has been isolated and put in
a separate class, <tt/CT&lowbar;Sql/. <tt/Session/ now makes
all storage accesses through a container class, which may or
may not be an SQL container.

<sect2>Instance variables
<p>

<table>
<tabular ca="">
database&lowbar;table<colsep>The name of the database table which should be used<rowsep>
database&lowbar;class<colsep>A classname. CT&lowbar;Sql uses this class to store and retrieve data<rowsep>
</tabular>
<caption>Accessible instance variables.</caption>
</table>

<sect2>Example
<p>

Use a subclass to provide the appropriate parameters 
to your container. Usually your subclass looks like this: 

<tscreen><code>
class My&lowbar;Sql extends CT&lowbar;Sql {
	var $classname = "My&lowbar;Sql";
	var $database&lowbar;table = "active&lowbar;sessions";
	var $database&lowbar;class = "DB&lowbar;Session";
}
</code></tscreen>

You can then use My&lowbar;Sql in class Session. Reference it
by putting "My&lowbar;Sql" in the "that&lowbar;class" variable.