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<?php
##
## Copyright (c) 1999 Internet Images srl
## Massimiliano Masserelli
##
## $Id: ct_split_sql.inc,v 1.4 1999/11/05 11:18:18 kir Exp $
##
## PHPLIB Data Storage Container using a SQL database and multiple
## rows for each element
##
## Every session-name pair will end up in one OR MORE table rows, thus
## allowing serialization of huge quantities of data.
##
class CT_Split_Sql {
##
## Define these parameters by overwriting or by
## deriving your own class from it (recommened)
##
var $database_table = "active_sessions_split";
var $database_class = "";
var $database_lock_semaphore = "";
var $split_length = 4096; ## Split data every xxx bytes
var $enc_methods = array(
"base64" => array("enc" => "base64_encode", "dec" => "base64_decode"),
"slashes" => array("enc" => "addslashes", "dec" => "strval")
);
var $encoding_mode = "base64";
## end of configuration
var $db;
function ac_start() {
$name = $this->database_class;
$this->db = new $name;
}
function ac_get_lock() {
if ( "" != $this->database_lock_semaphore ) {
while ( ! $this->db->query("SELECT get_lock('%s')",
$this->database_lock_semaphore) ) {
$t = 1 + time(); while ( $t > time() ) { ; }
}
}
}
function ac_release_lock() {
if ( "" != $this->database_lock_semaphore ) {
$this->db->query("SELECT release_lock('%s')",
$this->database_lock_semaphore);
}
}
function ac_gc($gc_time, $name) {
$timeout = time();
$sqldate = date("YmdHis", $timeout - ($gc_time * 60));
$this->db->query(sprintf("DELETE FROM %s ".
"WHERE ct_changed < '%s' AND ct_name = '%s'",
$this->database_table,
$sqldate,
addslashes($name)));
}
function ac_store($id, $name, $str) {
$ret = true;
$cmd = $this->enc_methods[$this->encoding_mode]["enc"];
$str = sprintf("%s:%s", $this->encoding_mode, $cmd($str));
$now = date("YmdHis", time());
if ( $this->db->type == "oracle" )
{
Ora_CommitOff($this->db->Link_ID);
} else {
$this->db->query("BEGIN TRANSACTION");
}
$this->ac_delete($id, $name);
$count = 0;
while ($part = substr($str, 0, $this->split_length)) {
$this->db->query(sprintf("INSERT INTO %s ".
" (ct_sid, ct_name, ct_pos, ct_val, ct_changed) ".
" VALUES ".
" ('%s','%s','%06d','%s','%s')",
$this->database_table,
$id,
addslashes($name),
$count++,
$part,
$now
));
$str = substr($str, $this->split_length);
}
if ( $this->db->type == "oracle" )
{
// Commit transaction
if(!@Ora_Commit($this->db->Link_ID))
{
$ret = false;
}
// Enable autocommit again
Ora_CommitOn($this->db->Link_ID);
} else {
$this->db->query("END TRANSACTION");
}
return $ret;
}
function ac_delete($id, $name) {
$this->db->query(sprintf("DELETE FROM %s ".
"WHERE ct_name = '%s' AND ct_sid = '%s'",
$this->database_table,
addslashes($name),
$id));
}
function ac_get_value($id, $name) {
$this->db->query(sprintf("SELECT ct_val, ct_pos FROM %s ".
"WHERE ct_sid = '%s' AND ct_name = '%s' ".
"ORDER BY ct_pos",
$this->database_table,
$id,
addslashes($name)));
$str="";
while ($this->db->next_record()) {
$str .= $this->db->f("ct_val");
}
# get encoding method from (method:value) pair
$colon_pos = strpos($str,':');
$str_method = substr ( $str , 0 , $colon_pos );
if( empty($str_method) ) {
// For compatibility with old sessions
$str_method = "base64";
$str_value = $str;
} else {
// New format case
$str_value = substr ( $str , $colon_pos + 1 );
}
$cmd = $this->enc_methods[$str_method]["dec"];
$str = $cmd($str_value);
## DEB echo $str;
return $str;
}
function ac_newid($str, $name) {
return $str;
}
function ac_halt($s) {
$this->db->halt($s);
}
## provide your own encoding/decoding method(s)
function set_enc_meth($name, $enc_func, $dec_func) {
if (!isset($this->enc_methods[$name])) {
$this->enc_methods[$name] = array ('enc'=> $enc_func, 'dec'=> $dec_func) ;
}
}
function get_enc_meth($name) {
return $this->enc_methods[$name];
}
}
?>
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