03-ct_split_sql.sgml

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

<sect1>CT&lowbar;Split&lowbar;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, <tt/Session/ now makes all storage
accesses through a container class. The
<tt/CT&lowbar;split&lowbar;sql/ container is very similar to
<tt/CT&lowbar;Sql/ container, with the difference that if
serialized data exceeds a specified amount of bytes, multiple
rows will be used to memorized the entire field.

This class is NOT compatible with <tt/CT&lowbar;Sql/ class, since
table layout is different and column names are different in order to
avoid reserved words in various database implementation. This uses a
<tt/DB&lowbar;Sql/ like class so you can access all supported databases
with this 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>
split&lowbar;length<colsep>A number. This specifies the maximum amount of bytes 
saved in each row of the table.
</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;Split&lowbar;Sql {
	var $classname = "My&lowbar;Sql";
	var $database&lowbar;table = "active&lowbar;sessions&lowbar;split";
	var $database&lowbar;class = "DB&lowbar;Session";
	var $split&lowbar;length = 4096;
}
</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.