03-ct_dbm.sgml

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<sect1>CT_Dbm
<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, <tt/Session/ now makes all storage
accesses through a container class. To let <tt/Session/ use a DBM
database file as a container, you use <tt/CT&lowbar;Dbm/.

<sect2>Instance variables
<p>

<table>
<tabular ca="">
dbm&lowbar;file<colsep>The path to the dbm file (must exist already AND must be writable by the server process)<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;Dbm extends CT&lowbar;Dbm {
	var $dbm&lowbar;file = "data/session.dbm";
}
</code></tscreen>

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