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<?php // -*-php-*-
rcs_id('$Id: ADODB_oci8po.php,v 1.4 2005/11/14 22:24:33 rurban Exp $');
/**
* Oracle extensions for the ADODB DB backend.
* @author: Philippe.Vanhaesendonck@topgame.be
*/
require_once('lib/WikiDB/backend/ADODB.php');
class WikiDB_backend_ADODB_oci8po
extends WikiDB_backend_ADODB
{
var $_prefix;
/**
* Constructor.
*/
function WikiDB_backend_ADODB_oci8po($dbparams) {
// Lowercase Assoc arrays
define('ADODB_ASSOC_CASE',0);
// Backend constructor
$this->WikiDB_backend_ADODB($dbparams);
// Empty strings are NULLS in Oracle
$this->_expressions['notempty'] = "IS NOT NULL";
// CLOB handling
$this->_expressions['iscontent'] = "DECODE(DBMS_LOB.GETLENGTH(content), NULL, 0, 0, 0, 1)";
$this->_prefix = isset($dbparams['prefix']) ? $dbparams['prefix'] : '';
}
/**
* Pack tables.
*/
function optimize() {
// Do nothing here -- Leave that for the DBA
// Cost Based Optimizer tuning vary from version to version
return 1;
}
/**
* Lock tables.
*
* We don't really need to lock exclusive, but I'll relax it when I fully
* understand phpWiki locking ;-)
*
*/
function _lock_tables($tables, $write_lock = true) {
if (!$tables) return;
$dbh = &$this->_dbh;
if($write_lock) {
// Next line is default behaviour, so just skip it
// $dbh->Execute("SET TRANSACTION READ WRITE");
foreach ($tables as $table) {
if ($this->_prefix && !strstr($table, $this->_prefix)) {
$table = $this->_prefix . $table;
}
$dbh->Execute("LOCK TABLE $table IN EXCLUSIVE MODE");
}
} else {
// Just ensure read consistency
$dbh->Execute("SET TRANSACTION READ ONLY");
}
}
/**
* Release the locks.
*/
function _unlock_tables($tables) {
$dbh = &$this->_dbh;
$dbh->Execute("COMMIT WORK");
}
// Search callbacks (replaced by class below)
// Page name
/*
function _sql_match_clause($word) {
$word = preg_replace('/(?=[%_\\\\])/', "\\", $word);
$word = $this->_dbh->qstr("%$word%");
return "LOWER(pagename) LIKE $word";
}
*/
// Fulltext -- case sensisitive :-\
// If we want case insensitive search, one need to create a Context
// Index on the CLOB. While it is very efficient, it requires the
// Intermedia Text option, so let's stick to the 'simple' thing
/*
function _fullsearch_sql_match_clause($word) {
$word = preg_replace('/(?=[%_\\\\])/', "\\", $word);
$wordq = $this->_dbh->qstr("%$word%");
return "LOWER(pagename) LIKE $wordq "
. "OR DBMS_LOB.INSTR(content, '$word') > 0";
}
*/
/**
* Serialize data
*/
function _serialize($data) {
if (empty($data))
return '';
assert(is_array($data));
return $this->_dbh->BlobEncode(serialize($data));
}
/**
* Unserialize data
*/
function _unserialize($data) {
if (empty($data))
return array();
$d = $this->_dbh->BlobDecode($data);
if(! is_string($d)) {
print_r($d);
}
return unserialize($this->_dbh->BlobDecode($data));
}
};
class WikiDB_backend_ADODB_oci8_search
extends WikiDB_backend_ADODB_search
{
// If we want case insensitive search, one need to create a Context
// Index on the CLOB. While it is very efficient, it requires the
// Intermedia Text option, so let's stick to the 'simple' thing
// Note that this does only an exact fulltext search, not using MATCH or LIKE.
function _fulltext_match_clause($node) {
if ($this->isStoplisted($node))
return "1=1";
$page = $node->sql();
$exactword = $node->_sql_quote($node->word);
return ($this->_case_exact
? "pagename LIKE '$page' OR DBMS_LOB.INSTR(content, '$exactword') > 0"
: "LOWER(pagename) LIKE '$page' OR DBMS_LOB.INSTR(content, '$exactword') > 0");
}
}
// (c-file-style: "gnu")
// Local Variables:
// mode: php
// tab-width: 8
// c-basic-offset: 4
// c-hanging-comment-ender-p: nil
// indent-tabs-mode: nil
// End:
?>
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