Initial commit

Signed-off-by: Florian Pritz <bluewind@xssn.at>

1 files changed, 1820 insertions, 0 deletions

diff --git a/system/database/DB_active_rec.php b/system/database/DB_active_rec.php
new file mode 100644
index 000000000..07021999f
--- /dev/null
+++ b/system/database/DB_active_rec.php
@@ -0,0 +1,1820 @@
+<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package		CodeIgniter
+ * @author		ExpressionEngine Dev Team
+ * @copyright	Copyright (c) 2008 - 2009, EllisLab, Inc.
+ * @license		http://codeigniter.com/user_guide/license.html
+ * @link		http://codeigniter.com
+ * @since		Version 1.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Active Record Class
+ *
+ * This is the platform-independent base Active Record implementation class.
+ *
+ * @package		CodeIgniter
+ * @subpackage	Drivers
+ * @category	Database
+ * @author		ExpressionEngine Dev Team
+ * @link		http://codeigniter.com/user_guide/database/
+ */
+class CI_DB_active_record extends CI_DB_driver {
+
+	var $ar_select				= array();
+	var $ar_distinct			= FALSE;
+	var $ar_from				= array();
+	var $ar_join				= array();
+	var $ar_where				= array();
+	var $ar_like				= array();
+	var $ar_groupby				= array();
+	var $ar_having				= array();
+	var $ar_limit				= FALSE;
+	var $ar_offset				= FALSE;
+	var $ar_order				= FALSE;
+	var $ar_orderby				= array();
+	var $ar_set					= array();	
+	var $ar_wherein				= array();
+	var $ar_aliased_tables		= array();
+	var $ar_store_array			= array();
+	
+	// Active Record Caching variables
+	var $ar_caching 			= FALSE;
+	var $ar_cache_exists		= array();
+	var $ar_cache_select		= array();
+	var $ar_cache_from			= array();
+	var $ar_cache_join			= array();
+	var $ar_cache_where			= array();
+	var $ar_cache_like			= array();
+	var $ar_cache_groupby		= array();
+	var $ar_cache_having		= array();
+	var $ar_cache_orderby		= array();
+	var $ar_cache_set			= array();	
+
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Select
+	 *
+	 * Generates the SELECT portion of the query
+	 *
+	 * @access	public
+	 * @param	string
+	 * @return	object
+	 */
+	function select($select = '*', $escape = NULL)
+	{
+		// Set the global value if this was sepecified	
+		if (is_bool($escape))
+		{
+			$this->_protect_identifiers = $escape;
+		}
+		
+		if (is_string($select))
+		{
+			$select = explode(',', $select);
+		}
+
+		foreach ($select as $val)
+		{
+			$val = trim($val);
+
+			if ($val != '')
+			{
+				$this->ar_select[] = $val;
+
+				if ($this->ar_caching === TRUE)
+				{
+					$this->ar_cache_select[] = $val;
+					$this->ar_cache_exists[] = 'select';
+				}
+			}
+		}
+		return $this;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Select Max
+	 *
+	 * Generates a SELECT MAX(field) portion of a query
+	 *
+	 * @access	public
+	 * @param	string	the field
+	 * @param	string	an alias
+	 * @return	object
+	 */
+	function select_max($select = '', $alias = '')
+	{
+		return $this->_max_min_avg_sum($select, $alias, 'MAX');
+	}
+		
+	// --------------------------------------------------------------------
+
+	/**
+	 * Select Min
+	 *
+	 * Generates a SELECT MIN(field) portion of a query
+	 *
+	 * @access	public
+	 * @param	string	the field
+	 * @param	string	an alias
+	 * @return	object
+	 */
+	function select_min($select = '', $alias = '')
+	{
+		return $this->_max_min_avg_sum($select, $alias, 'MIN');
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Select Average
+	 *
+	 * Generates a SELECT AVG(field) portion of a query
+	 *
+	 * @access	public
+	 * @param	string	the field
+	 * @param	string	an alias
+	 * @return	object
+	 */
+	function select_avg($select = '', $alias = '')
+	{
+		return $this->_max_min_avg_sum($select, $alias, 'AVG');
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Select Sum
+	 *
+	 * Generates a SELECT SUM(field) portion of a query
+	 *
+	 * @access	public
+	 * @param	string	the field
+	 * @param	string	an alias
+	 * @return	object
+	 */
+	function select_sum($select = '', $alias = '')
+	{
+		return $this->_max_min_avg_sum($select, $alias, 'SUM');
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Processing Function for the four functions above:
+	 *
+	 *	select_max()
+	 *	select_min()
+	 *	select_avg()
+	 *  select_sum()
+	 *	
+	 * @access	public
+	 * @param	string	the field
+	 * @param	string	an alias
+	 * @return	object
+	 */
+	function _max_min_avg_sum($select = '', $alias = '', $type = 'MAX')
+	{
+		if ( ! is_string($select) OR $select == '')
+		{
+			$this->display_error('db_invalid_query');
+		}
+	
+		$type = strtoupper($type);
+	
+		if ( ! in_array($type, array('MAX', 'MIN', 'AVG', 'SUM')))
+		{
+			show_error('Invalid function type: '.$type);
+		}
+	
+		if ($alias == '')
+		{
+			$alias = $this->_create_alias_from_table(trim($select));
+		}
+	
+		$sql = $type.'('.$this->_protect_identifiers(trim($select)).') AS '.$alias;
+
+		$this->ar_select[] = $sql;
+		
+		if ($this->ar_caching === TRUE)
+		{
+			$this->ar_cache_select[] = $sql;
+			$this->ar_cache_exists[] = 'select';
+		}
+		
+		return $this;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Determines the alias name based on the table
+	 *
+	 * @access	private
+	 * @param	string
+	 * @return	string
+	 */
+	function _create_alias_from_table($item)
+	{
+		if (strpos($item, '.') !== FALSE)
+		{
+			return end(explode('.', $item));
+		}
+		
+		return $item;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * DISTINCT
+	 *
+	 * Sets a flag which tells the query string compiler to add DISTINCT
+	 *
+	 * @access	public
+	 * @param	bool
+	 * @return	object
+	 */
+	function distinct($val = TRUE)
+	{
+		$this->ar_distinct = (is_bool($val)) ? $val : TRUE;
+		return $this;
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * From
+	 *
+	 * Generates the FROM portion of the query
+	 *
+	 * @access	public
+	 * @param	mixed	can be a string or array
+	 * @return	object
+	 */
+	function from($from)
+	{
+		foreach ((array)$from as $val)
+		{
+			if (strpos($val, ',') !== FALSE)
+			{
+				foreach (explode(',', $val) as $v)
+				{
+					$v = trim($v);
+					$this->_track_aliases($v);
+
+					$this->ar_from[] = $this->_protect_identifiers($v, TRUE, NULL, FALSE);
+					
+					if ($this->ar_caching === TRUE)
+					{
+						$this->ar_cache_from[] = $this->_protect_identifiers($v, TRUE, NULL, FALSE);
+						$this->ar_cache_exists[] = 'from';
+					}				
+				}
+
+			}
+			else
+			{
+				$val = trim($val);
+
+				// Extract any aliases that might exist.  We use this information
+				// in the _protect_identifiers to know whether to add a table prefix 
+				$this->_track_aliases($val);
+	
+				$this->ar_from[] = $this->_protect_identifiers($val, TRUE, NULL, FALSE);
+				
+				if ($this->ar_caching === TRUE)
+				{
+					$this->ar_cache_from[] = $this->_protect_identifiers($val, TRUE, NULL, FALSE);
+					$this->ar_cache_exists[] = 'from';
+				}
+			}
+		}
+
+		return $this;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Join
+	 *
+	 * Generates the JOIN portion of the query
+	 *
+	 * @access	public
+	 * @param	string
+	 * @param	string	the join condition
+	 * @param	string	the type of join
+	 * @return	object
+	 */
+	function join($table, $cond, $type = '')
+	{		
+		if ($type != '')
+		{
+			$type = strtoupper(trim($type));
+
+			if ( ! in_array($type, array('LEFT', 'RIGHT', 'OUTER', 'INNER', 'LEFT OUTER', 'RIGHT OUTER')))
+			{
+				$type = '';
+			}
+			else
+			{
+				$type .= ' ';
+			}
+		}
+
+		// Extract any aliases that might exist.  We use this information
+		// in the _protect_identifiers to know whether to add a table prefix 
+		$this->_track_aliases($table);
+
+		// Strip apart the condition and protect the identifiers
+		if (preg_match('/([\w\.]+)([\W\s]+)(.+)/', $cond, $match))
+		{
+			$match[1] = $this->_protect_identifiers($match[1]);
+			$match[3] = $this->_protect_identifiers($match[3]);
+		
+			$cond = $match[1].$match[2].$match[3];		
+		}
+		
+		// Assemble the JOIN statement
+		$join = $type.'JOIN '.$this->_protect_identifiers($table, TRUE, NULL, FALSE).' ON '.$cond;
+
+		$this->ar_join[] = $join;
+		if ($this->ar_caching === TRUE)
+		{
+			$this->ar_cache_join[] = $join;
+			$this->ar_cache_exists[] = 'join';
+		}
+
+		return $this;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Where
+	 *
+	 * Generates the WHERE portion of the query. Separates
+	 * multiple calls with AND
+	 *
+	 * @access	public
+	 * @param	mixed
+	 * @param	mixed
+	 * @return	object
+	 */
+	function where($key, $value = NULL, $escape = TRUE)
+	{
+		return $this->_where($key, $value, 'AND ', $escape);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * OR Where
+	 *
+	 * Generates the WHERE portion of the query. Separates
+	 * multiple calls with OR
+	 *
+	 * @access	public
+	 * @param	mixed
+	 * @param	mixed
+	 * @return	object
+	 */
+	function or_where($key, $value = NULL, $escape = TRUE)
+	{
+		return $this->_where($key, $value, 'OR ', $escape);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * orwhere() is an alias of or_where()
+	 * this function is here for backwards compatibility, as
+	 * orwhere() has been deprecated
+	 */
+	function orwhere($key, $value = NULL, $escape = TRUE)
+	{
+		return $this->or_where($key, $value, $escape);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Where
+	 *
+	 * Called by where() or orwhere()
+	 *
+	 * @access	private
+	 * @param	mixed
+	 * @param	mixed
+	 * @param	string
+	 * @return	object
+	 */
+	function _where($key, $value = NULL, $type = 'AND ', $escape = NULL)
+	{
+		if ( ! is_array($key))
+		{
+			$key = array($key => $value);
+		}
+		
+		// If the escape value was not set will will base it on the global setting
+		if ( ! is_bool($escape))
+		{
+			$escape = $this->_protect_identifiers;
+		}
+
+		foreach ($key as $k => $v)
+		{
+			$prefix = (count($this->ar_where) == 0 AND count($this->ar_cache_where) == 0) ? '' : $type;
+
+			if (is_null($v) && ! $this->_has_operator($k))
+			{
+				// value appears not to have been set, assign the test to IS NULL
+				$k .= ' IS NULL';
+			}
+			
+			if ( ! is_null($v))
+			{
+				if ($escape === TRUE)
+				{
+					$k = $this->_protect_identifiers($k, FALSE, $escape);
+					
+					$v = ' '.$this->escape($v);
+				}
+
+				if ( ! $this->_has_operator($k))
+				{
+					$k .= ' =';
+				}
+			}
+			else
+			{
+				$k = $this->_protect_identifiers($k, FALSE, $escape);			
+			}
+
+			$this->ar_where[] = $prefix.$k.$v;
+			
+			if ($this->ar_caching === TRUE)
+			{
+				$this->ar_cache_where[] = $prefix.$k.$v;
+				$this->ar_cache_exists[] = 'where';
+			}
+			
+		}
+		
+		return $this;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Where_in
+	 *
+	 * Generates a WHERE field IN ('item', 'item') SQL query joined with
+	 * AND if appropriate
+	 *
+	 * @access	public
+	 * @param	string	The field to search
+	 * @param	array	The values searched on
+	 * @return	object
+	 */
+	function where_in($key = NULL, $values = NULL)
+	{
+		return $this->_where_in($key, $values);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Where_in_or
+	 *
+	 * Generates a WHERE field IN ('item', 'item') SQL query joined with
+	 * OR if appropriate
+	 *
+	 * @access	public
+	 * @param	string	The field to search
+	 * @param	array	The values searched on
+	 * @return	object
+	 */
+	function or_where_in($key = NULL, $values = NULL)
+	{
+		return $this->_where_in($key, $values, FALSE, 'OR ');
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Where_not_in
+	 *
+	 * Generates a WHERE field NOT IN ('item', 'item') SQL query joined
+	 * with AND if appropriate
+	 *
+	 * @access	public
+	 * @param	string	The field to search
+	 * @param	array	The values searched on
+	 * @return	object
+	 */
+	function where_not_in($key = NULL, $values = NULL)
+	{
+		return $this->_where_in($key, $values, TRUE);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Where_not_in_or
+	 *
+	 * Generates a WHERE field NOT IN ('item', 'item') SQL query joined
+	 * with OR if appropriate
+	 *
+	 * @access	public
+	 * @param	string	The field to search
+	 * @param	array	The values searched on
+	 * @return	object
+	 */
+	function or_where_not_in($key = NULL, $values = NULL)
+	{
+		return $this->_where_in($key, $values, TRUE, 'OR ');
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Where_in
+	 *
+	 * Called by where_in, where_in_or, where_not_in, where_not_in_or
+	 *
+	 * @access	public
+	 * @param	string	The field to search
+	 * @param	array	The values searched on
+	 * @param	boolean	If the statement would be IN or NOT IN
+	 * @param	string	
+	 * @return	object
+	 */
+	function _where_in($key = NULL, $values = NULL, $not = FALSE, $type = 'AND ')
+	{
+		if ($key === NULL OR $values === NULL)
+		{
+			return;
+		}
+		
+		if ( ! is_array($values))
+		{
+			$values = array($values);
+		}
+		
+		$not = ($not) ? ' NOT' : '';
+
+		foreach ($values as $value)
+		{
+			$this->ar_wherein[] = $this->escape($value);
+		}
+
+		$prefix = (count($this->ar_where) == 0) ? '' : $type;
+ 
+		$where_in = $prefix . $this->_protect_identifiers($key) . $not . " IN (" . implode(", ", $this->ar_wherein) . ") ";
+
+		$this->ar_where[] = $where_in;
+		if ($this->ar_caching === TRUE)
+		{
+			$this->ar_cache_where[] = $where_in;
+			$this->ar_cache_exists[] = 'where';
+		}
+
+		// reset the array for multiple calls
+		$this->ar_wherein = array();
+		return $this;
+	}
+		
+	// --------------------------------------------------------------------
+
+	/**
+	 * Like
+	 *
+	 * Generates a %LIKE% portion of the query. Separates
+	 * multiple calls with AND
+	 *
+	 * @access	public
+	 * @param	mixed
+	 * @param	mixed
+	 * @return	object
+	 */
+	function like($field, $match = '', $side = 'both')
+	{
+		return $this->_like($field, $match, 'AND ', $side);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Not Like
+	 *
+	 * Generates a NOT LIKE portion of the query. Separates
+	 * multiple calls with AND
+	 *
+	 * @access	public
+	 * @param	mixed
+	 * @param	mixed
+	 * @return	object
+	 */
+	function not_like($field, $match = '', $side = 'both')
+	{
+		return $this->_like($field, $match, 'AND ', $side, 'NOT');
+	}
+		
+	// --------------------------------------------------------------------
+
+	/**
+	 * OR Like
+	 *
+	 * Generates a %LIKE% portion of the query. Separates
+	 * multiple calls with OR
+	 *
+	 * @access	public
+	 * @param	mixed
+	 * @param	mixed
+	 * @return	object
+	 */
+	function or_like($field, $match = '', $side = 'both')
+	{
+		return $this->_like($field, $match, 'OR ', $side);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * OR Not Like
+	 *
+	 * Generates a NOT LIKE portion of the query. Separates
+	 * multiple calls with OR
+	 *
+	 * @access	public
+	 * @param	mixed
+	 * @param	mixed
+	 * @return	object
+	 */
+	function or_not_like($field, $match = '', $side = 'both')
+	{
+		return $this->_like($field, $match, 'OR ', $side, 'NOT');
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * orlike() is an alias of or_like()
+	 * this function is here for backwards compatibility, as
+	 * orlike() has been deprecated
+	 */
+	function orlike($field, $match = '', $side = 'both')
+	{
+		return $this->or_like($field, $match, $side);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Like
+	 *
+	 * Called by like() or orlike()
+	 *
+	 * @access	private
+	 * @param	mixed
+	 * @param	mixed
+	 * @param	string
+	 * @return	object
+	 */
+	function _like($field, $match = '', $type = 'AND ', $side = 'both', $not = '')
+	{
+		if ( ! is_array($field))
+		{
+			$field = array($field => $match);
+		}
+ 	
+		foreach ($field as $k => $v)
+		{
+			$k = $this->_protect_identifiers($k);
+
+			$prefix = (count($this->ar_like) == 0) ? '' : $type;
+
+			$v = $this->escape_like_str($v);
+
+			if ($side == 'before')
+			{
+				$like_statement = $prefix." $k $not LIKE '%{$v}'";
+			}
+			elseif ($side == 'after')
+			{
+				$like_statement = $prefix." $k $not LIKE '{$v}%'";
+			}
+			else
+			{
+				$like_statement = $prefix." $k $not LIKE '%{$v}%'";
+			}
+			
+			// some platforms require an escape sequence definition for LIKE wildcards
+			if ($this->_like_escape_str != '')
+			{
+				$like_statement = $like_statement.sprintf($this->_like_escape_str, $this->_like_escape_char);
+			}
+			
+			$this->ar_like[] = $like_statement;
+			if ($this->ar_caching === TRUE)
+			{
+				$this->ar_cache_like[] = $like_statement;
+				$this->ar_cache_exists[] = 'like';
+			}
+			
+		}
+		return $this;
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * GROUP BY
+	 *
+	 * @access	public
+	 * @param	string
+	 * @return	object
+	 */
+	function group_by($by)
+	{
+		if (is_string($by))
+		{
+			$by = explode(',', $by);
+		}
+	
+		foreach ($by as $val)
+		{
+			$val = trim($val);
+		
+			if ($val != '')
+			{
+				$this->ar_groupby[] = $this->_protect_identifiers($val);
+				
+				if ($this->ar_caching === TRUE)
+				{
+					$this->ar_cache_groupby[] = $this->_protect_identifiers($val);
+					$this->ar_cache_exists[] = 'groupby';
+				}
+			}
+		}
+		return $this;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * groupby() is an alias of group_by()
+	 * this function is here for backwards compatibility, as
+	 * groupby() has been deprecated
+	 */
+	function groupby($by)
+	{
+		return $this->group_by($by);
+	}	
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Sets the HAVING value
+	 *
+	 * Separates multiple calls with AND
+	 *
+	 * @access	public
+	 * @param	string
+	 * @param	string
+	 * @return	object
+	 */
+	function having($key, $value = '', $escape = TRUE)
+	{
+		return $this->_having($key, $value, 'AND ', $escape);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * orhaving() is an alias of or_having()
+	 * this function is here for backwards compatibility, as
+	 * orhaving() has been deprecated
+	 */
+
+	function orhaving($key, $value = '', $escape = TRUE)
+	{
+		return $this->or_having($key, $value, $escape);
+	}	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Sets the OR HAVING value
+	 *
+	 * Separates multiple calls with OR
+	 *
+	 * @access	public
+	 * @param	string
+	 * @param	string
+	 * @return	object
+	 */
+	function or_having($key, $value = '', $escape = TRUE)
+	{
+		return $this->_having($key, $value, 'OR ', $escape);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Sets the HAVING values
+	 *
+	 * Called by having() or or_having()
+	 *
+	 * @access	private
+	 * @param	string
+	 * @param	string
+	 * @return	object
+	 */
+	function _having($key, $value = '', $type = 'AND ', $escape = TRUE)
+	{
+		if ( ! is_array($key))
+		{
+			$key = array($key => $value);
+		}
+	
+		foreach ($key as $k => $v)
+		{
+			$prefix = (count($this->ar_having) == 0) ? '' : $type;
+
+			if ($escape === TRUE)
+			{
+				$k = $this->_protect_identifiers($k);
+			}
+
+			if ( ! $this->_has_operator($k))
+			{
+				$k .= ' = ';
+			}
+
+			if ($v != '')
+			{
+				$v = ' '.$this->escape_str($v);
+			}
+			
+			$this->ar_having[] = $prefix.$k.$v;
+			if ($this->ar_caching === TRUE)
+			{
+				$this->ar_cache_having[] = $prefix.$k.$v;
+				$this->ar_cache_exists[] = 'having';
+			}
+		}
+		
+		return $this;
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Sets the ORDER BY value
+	 *
+	 * @access	public
+	 * @param	string
+	 * @param	string	direction: asc or desc
+	 * @return	object
+	 */
+	function order_by($orderby, $direction = '')
+	{
+		if (strtolower($direction) == 'random')
+		{
+			$orderby = ''; // Random results want or don't need a field name
+			$direction = $this->_random_keyword;
+		}
+		elseif (trim($direction) != '')
+		{
+			$direction = (in_array(strtoupper(trim($direction)), array('ASC', 'DESC'), TRUE)) ? ' '.$direction : ' ASC';
+		}
+	
+	
+		if (strpos($orderby, ',') !== FALSE)
+		{
+			$temp = array();
+			foreach (explode(',', $orderby) as $part)
+			{
+				$part = trim($part);
+				if ( ! in_array($part, $this->ar_aliased_tables))
+				{
+					$part = $this->_protect_identifiers(trim($part));
+				}
+				
+				$temp[] = $part;
+			}
+			
+			$orderby = implode(', ', $temp);			
+		}
+		else if ($direction != $this->_random_keyword)
+		{
+			$orderby = $this->_protect_identifiers($orderby);
+		}
+	
+		$orderby_statement = $orderby.$direction;
+		
+		$this->ar_orderby[] = $orderby_statement;
+		if ($this->ar_caching === TRUE)
+		{
+			$this->ar_cache_orderby[] = $orderby_statement;
+			$this->ar_cache_exists[] = 'orderby';
+		}
+
+		return $this;
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * orderby() is an alias of order_by()
+	 * this function is here for backwards compatibility, as
+	 * orderby() has been deprecated
+	 */
+	function orderby($orderby, $direction = '')
+	{
+		return $this->order_by($orderby, $direction);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Sets the LIMIT value
+	 *
+	 * @access	public
+	 * @param	integer	the limit value
+	 * @param	integer	the offset value
+	 * @return	object
+	 */
+	function limit($value, $offset = '')
+	{
+		$this->ar_limit = $value;
+
+		if ($offset != '')
+		{
+			$this->ar_offset = $offset;
+		}
+		
+		return $this;
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Sets the OFFSET value
+	 *
+	 * @access	public
+	 * @param	integer	the offset value
+	 * @return	object
+	 */
+	function offset($offset)
+	{
+		$this->ar_offset = $offset;
+		return $this;
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * The "set" function.  Allows key/value pairs to be set for inserting or updating
+	 *
+	 * @access	public
+	 * @param	mixed
+	 * @param	string
+	 * @param	boolean
+	 * @return	object
+	 */
+	function set($key, $value = '', $escape = TRUE)
+	{
+		$key = $this->_object_to_array($key);
+	
+		if ( ! is_array($key))
+		{
+			$key = array($key => $value);
+		}	
+
+		foreach ($key as $k => $v)
+		{
+			if ($escape === FALSE)
+			{
+				$this->ar_set[$this->_protect_identifiers($k)] = $v;
+			}
+			else
+			{
+				$this->ar_set[$this->_protect_identifiers($k)] = $this->escape($v);
+			}
+		}
+		
+		return $this;
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Get
+	 *
+	 * Compiles the select statement based on the other functions called
+	 * and runs the query
+	 *
+	 * @access	public
+	 * @param	string	the table
+	 * @param	string	the limit clause
+	 * @param	string	the offset clause
+	 * @return	object
+	 */
+	function get($table = '', $limit = null, $offset = null)
+	{
+		if ($table != '')
+		{
+			$this->_track_aliases($table);
+			$this->from($table);
+		}
+		
+		if ( ! is_null($limit))
+		{
+			$this->limit($limit, $offset);
+		}
+			
+		$sql = $this->_compile_select();
+
+		$result = $this->query($sql);
+		$this->_reset_select();
+		return $result;
+	}
+
+	/**
+	 * "Count All Results" query
+	 *
+	 * Generates a platform-specific query string that counts all records 
+	 * returned by an Active Record query.
+	 *
+	 * @access	public
+	 * @param	string
+	 * @return	string
+	 */
+	function count_all_results($table = '')
+	{
+		if ($table != '')
+		{
+			$this->_track_aliases($table);
+			$this->from($table);
+		}
+		
+		$sql = $this->_compile_select($this->_count_string . $this->_protect_identifiers('numrows'));
+
+		$query = $this->query($sql);
+		$this->_reset_select();
+	
+		if ($query->num_rows() == 0)
+		{
+			return '0';
+		}
+
+		$row = $query->row();
+		return $row->numrows;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Get_Where
+	 *
+	 * Allows the where clause, limit and offset to be added directly
+	 *
+	 * @access	public
+	 * @param	string	the where clause
+	 * @param	string	the limit clause
+	 * @param	string	the offset clause
+	 * @return	object
+	 */
+	function get_where($table = '', $where = null, $limit = null, $offset = null)
+	{
+		if ($table != '')
+		{
+			$this->from($table);
+		}
+
+		if ( ! is_null($where))
+		{
+			$this->where($where);
+		}
+		
+		if ( ! is_null($limit))
+		{
+			$this->limit($limit, $offset);
+		}
+			
+		$sql = $this->_compile_select();
+
+		$result = $this->query($sql);
+		$this->_reset_select();
+		return $result;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * getwhere() is an alias of get_where()
+	 * this function is here for backwards compatibility, as
+	 * getwhere() has been deprecated
+	 */
+	function getwhere($table = '', $where = null, $limit = null, $offset = null)
+	{
+		return $this->get_where($table, $where, $limit, $offset);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Insert
+	 *
+	 * Compiles an insert string and runs the query
+	 *
+	 * @access	public
+	 * @param	string	the table to retrieve the results from
+	 * @param	array	an associative array of insert values
+	 * @return	object
+	 */
+	function insert($table = '', $set = NULL)
+	{	
+		if ( ! is_null($set))
+		{
+			$this->set($set);
+		}
+	
+		if (count($this->ar_set) == 0)
+		{
+			if ($this->db_debug)
+			{
+				return $this->display_error('db_must_use_set');
+			}
+			return FALSE;
+		}
+
+		if ($table == '')
+		{
+			if ( ! isset($this->ar_from[0]))
+			{
+				if ($this->db_debug)
+				{
+					return $this->display_error('db_must_set_table');
+				}
+				return FALSE;
+			}
+			
+			$table = $this->ar_from[0];
+		}
+
+		$sql = $this->_insert($this->_protect_identifiers($table, TRUE, NULL, FALSE), array_keys($this->ar_set), array_values($this->ar_set));
+		
+		$this->_reset_write();
+		return $this->query($sql);		
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Update
+	 *
+	 * Compiles an update string and runs the query
+	 *
+	 * @access	public
+	 * @param	string	the table to retrieve the results from
+	 * @param	array	an associative array of update values
+	 * @param	mixed	the where clause
+	 * @return	object
+	 */
+	function update($table = '', $set = NULL, $where = NULL, $limit = NULL)
+	{
+		// Combine any cached components with the current statements
+		$this->_merge_cache();
+
+		if ( ! is_null($set))
+		{
+			$this->set($set);
+		}
+	
+		if (count($this->ar_set) == 0)
+		{
+			if ($this->db_debug)
+			{
+				return $this->display_error('db_must_use_set');
+			}
+			return FALSE;
+		}
+
+		if ($table == '')
+		{
+			if ( ! isset($this->ar_from[0]))
+			{
+				if ($this->db_debug)
+				{
+					return $this->display_error('db_must_set_table');
+				}
+				return FALSE;
+			}
+			
+			$table = $this->ar_from[0];
+		}
+		
+		if ($where != NULL)
+		{
+			$this->where($where);
+		}
+
+		if ($limit != NULL)
+		{
+			$this->limit($limit);
+		}
+		
+		$sql = $this->_update($this->_protect_identifiers($table, TRUE, NULL, FALSE), $this->ar_set, $this->ar_where, $this->ar_orderby, $this->ar_limit);
+		
+		$this->_reset_write();
+		return $this->query($sql);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Empty Table
+	 *
+	 * Compiles a delete string and runs "DELETE FROM table"
+	 *
+	 * @access	public
+	 * @param	string	the table to empty
+	 * @return	object
+	 */
+	function empty_table($table = '')
+	{
+		if ($table == '')
+		{
+			if ( ! isset($this->ar_from[0]))
+			{
+				if ($this->db_debug)
+				{
+					return $this->display_error('db_must_set_table');
+				}
+				return FALSE;
+			}
+
+			$table = $this->ar_from[0];
+		}
+		else
+		{
+			$table = $this->_protect_identifiers($table, TRUE, NULL, FALSE);
+		}
+
+		$sql = $this->_delete($table);
+
+		$this->_reset_write();
+		
+		return $this->query($sql);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Truncate
+	 *
+	 * Compiles a truncate string and runs the query
+	 * If the database does not support the truncate() command
+	 * This function maps to "DELETE FROM table"
+	 *
+	 * @access	public
+	 * @param	string	the table to truncate
+	 * @return	object
+	 */
+	function truncate($table = '')
+	{
+		if ($table == '')
+		{
+			if ( ! isset($this->ar_from[0]))
+			{
+				if ($this->db_debug)
+				{
+					return $this->display_error('db_must_set_table');
+				}
+				return FALSE;
+			}
+
+			$table = $this->ar_from[0];
+		}
+		else
+		{
+			$table = $this->_protect_identifiers($table, TRUE, NULL, FALSE);
+		}
+
+		$sql = $this->_truncate($table);
+
+		$this->_reset_write();
+		
+		return $this->query($sql);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Delete
+	 *
+	 * Compiles a delete string and runs the query
+	 *
+	 * @access	public
+	 * @param	mixed	the table(s) to delete from. String or array
+	 * @param	mixed	the where clause
+	 * @param	mixed	the limit clause
+	 * @param	boolean
+	 * @return	object
+	 */
+	function delete($table = '', $where = '', $limit = NULL, $reset_data = TRUE)
+	{
+		// Combine any cached components with the current statements
+		$this->_merge_cache();
+
+		if ($table == '')
+		{
+			if ( ! isset($this->ar_from[0]))
+			{
+				if ($this->db_debug)
+				{
+					return $this->display_error('db_must_set_table');
+				}
+				return FALSE;
+			}
+
+			$table = $this->ar_from[0];
+		}
+		elseif (is_array($table))
+		{
+			foreach($table as $single_table)
+			{
+				$this->delete($single_table, $where, $limit, FALSE);
+			}
+
+			$this->_reset_write();
+			return;
+		}
+		else
+		{
+			$table = $this->_protect_identifiers($table, TRUE, NULL, FALSE);
+		}
+
+		if ($where != '')
+		{
+			$this->where($where);
+		}
+
+		if ($limit != NULL)
+		{
+			$this->limit($limit);
+		}
+
+		if (count($this->ar_where) == 0 && count($this->ar_wherein) == 0 && count($this->ar_like) == 0)
+		{
+			if ($this->db_debug)
+			{
+				return $this->display_error('db_del_must_use_where');
+			}
+
+			return FALSE;
+		}		
+
+		$sql = $this->_delete($table, $this->ar_where, $this->ar_like, $this->ar_limit);
+
+		if ($reset_data)
+		{
+			$this->_reset_write();
+		}
+		
+		return $this->query($sql);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * DB Prefix
+	 *
+	 * Prepends a database prefix if one exists in configuration
+	 *
+	 * @access	public
+	 * @param	string	the table
+	 * @return	string
+	 */
+	function dbprefix($table = '')
+	{
+		if ($table == '')
+		{
+			$this->display_error('db_table_name_required');
+		}
+
+		return $this->dbprefix.$table;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Track Aliases
+	 *
+	 * Used to track SQL statements written with aliased tables.
+	 *
+	 * @access	private
+	 * @param	string	The table to inspect
+	 * @return	string
+	 */	
+	function _track_aliases($table)
+	{
+		if (is_array($table))
+		{
+			foreach ($table as $t)
+			{
+				$this->_track_aliases($t);
+			}
+			return;
+		}
+		
+		// Does the string contain a comma?  If so, we need to separate
+		// the string into discreet statements
+		if (strpos($table, ',') !== FALSE)
+		{
+			return $this->_track_aliases(explode(',', $table));
+		}
+	
+		// if a table alias is used we can recognize it by a space
+		if (strpos($table, " ") !== FALSE)
+		{
+			// if the alias is written with the AS keyword, remove it
+			$table = preg_replace('/ AS /i', ' ', $table);
+			
+			// Grab the alias
+			$table = trim(strrchr($table, " "));
+			
+			// Store the alias, if it doesn't already exist
+			if ( ! in_array($table, $this->ar_aliased_tables))
+			{
+				$this->ar_aliased_tables[] = $table;
+			}
+		}
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Compile the SELECT statement
+	 *
+	 * Generates a query string based on which functions were used.
+	 * Should not be called directly.  The get() function calls it.
+	 *
+	 * @access	private
+	 * @return	string
+	 */
+	function _compile_select($select_override = FALSE)
+	{
+		// Combine any cached components with the current statements
+		$this->_merge_cache();
+
+		// ----------------------------------------------------------------
+		
+		// Write the "select" portion of the query
+
+		if ($select_override !== FALSE)
+		{
+			$sql = $select_override;
+		}
+		else
+		{
+			$sql = ( ! $this->ar_distinct) ? 'SELECT ' : 'SELECT DISTINCT ';
+		
+			if (count($this->ar_select) == 0)
+			{
+				$sql .= '*';		
+			}
+			else
+			{				
+				// Cycle through the "select" portion of the query and prep each column name.
+				// The reason we protect identifiers here rather then in the select() function
+				// is because until the user calls the from() function we don't know if there are aliases
+				foreach ($this->ar_select as $key => $val)
+				{
+					$this->ar_select[$key] = $this->_protect_identifiers($val);
+				}
+				
+				$sql .= implode(', ', $this->ar_select);
+			}
+		}
+
+		// ----------------------------------------------------------------
+		
+		// Write the "FROM" portion of the query
+
+		if (count($this->ar_from) > 0)
+		{
+			$sql .= "\nFROM ";
+
+			$sql .= $this->_from_tables($this->ar_from);
+		}
+
+		// ----------------------------------------------------------------
+		
+		// Write the "JOIN" portion of the query
+
+		if (count($this->ar_join) > 0)
+		{
+			$sql .= "\n";
+
+			$sql .= implode("\n", $this->ar_join);
+		}
+
+		// ----------------------------------------------------------------
+		
+		// Write the "WHERE" portion of the query
+
+		if (count($this->ar_where) > 0 OR count($this->ar_like) > 0)
+		{
+			$sql .= "\n";
+
+			$sql .= "WHERE ";
+		}
+
+		$sql .= implode("\n", $this->ar_where);
+
+		// ----------------------------------------------------------------
+		
+		// Write the "LIKE" portion of the query
+	
+		if (count($this->ar_like) > 0)
+		{
+			if (count($this->ar_where) > 0)
+			{
+				$sql .= "\nAND ";
+			}
+
+			$sql .= implode("\n", $this->ar_like);
+		}
+
+		// ----------------------------------------------------------------
+		
+		// Write the "GROUP BY" portion of the query
+	
+		if (count($this->ar_groupby) > 0)
+		{
+			$sql .= "\nGROUP BY ";
+			
+			$sql .= implode(', ', $this->ar_groupby);
+		}
+
+		// ----------------------------------------------------------------
+		
+		// Write the "HAVING" portion of the query
+		
+		if (count($this->ar_having) > 0)
+		{
+			$sql .= "\nHAVING ";
+			$sql .= implode("\n", $this->ar_having);
+		}
+
+		// ----------------------------------------------------------------
+		
+		// Write the "ORDER BY" portion of the query
+
+		if (count($this->ar_orderby) > 0)
+		{
+			$sql .= "\nORDER BY ";
+			$sql .= implode(', ', $this->ar_orderby);
+			
+			if ($this->ar_order !== FALSE)
+			{
+				$sql .= ($this->ar_order == 'desc') ? ' DESC' : ' ASC';
+			}		
+		}
+
+		// ----------------------------------------------------------------
+		
+		// Write the "LIMIT" portion of the query
+		
+		if (is_numeric($this->ar_limit))
+		{
+			$sql .= "\n";
+			$sql = $this->_limit($sql, $this->ar_limit, $this->ar_offset);
+		}
+
+		return $sql;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Object to Array
+	 *
+	 * Takes an object as input and converts the class variables to array key/vals
+	 *
+	 * @access	public
+	 * @param	object
+	 * @return	array
+	 */
+	function _object_to_array($object)
+	{
+		if ( ! is_object($object))
+		{
+			return $object;
+		}
+		
+		$array = array();
+		foreach (get_object_vars($object) as $key => $val)
+		{
+			// There are some built in keys we need to ignore for this conversion
+			if ( ! is_object($val) && ! is_array($val) && $key != '_parent_name' && $key != '_ci_scaffolding' && $key != '_ci_scaff_table')
+			{
+				$array[$key] = $val;
+			}
+		}
+	
+		return $array;
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Start Cache
+	 *
+	 * Starts AR caching
+	 *
+	 * @access	public
+	 * @return	void
+	 */		
+	function start_cache()
+	{
+		$this->ar_caching = TRUE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Stop Cache
+	 *
+	 * Stops AR caching
+	 *
+	 * @access	public
+	 * @return	void
+	 */		
+	function stop_cache()
+	{
+		$this->ar_caching = FALSE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Flush Cache
+	 *
+	 * Empties the AR cache
+	 *
+	 * @access	public
+	 * @return	void
+	 */	
+	function flush_cache()
+	{	
+		$this->_reset_run(
+							array(
+									'ar_cache_select'	=> array(), 
+									'ar_cache_from'		=> array(), 
+									'ar_cache_join'		=> array(),
+									'ar_cache_where'	=> array(), 
+									'ar_cache_like'		=> array(), 
+									'ar_cache_groupby'	=> array(), 
+									'ar_cache_having'	=> array(), 
+									'ar_cache_orderby'	=> array(), 
+									'ar_cache_set'		=> array(),
+									'ar_cache_exists'	=> array()
+								)
+							);	
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Merge Cache
+	 *
+	 * When called, this function merges any cached AR arrays with 
+	 * locally called ones.
+	 *
+	 * @access	private
+	 * @return	void
+	 */
+	function _merge_cache()
+	{
+		if (count($this->ar_cache_exists) == 0)
+		{
+			return;
+		}
+
+		foreach ($this->ar_cache_exists as $val)
+		{
+			$ar_variable	= 'ar_'.$val;
+			$ar_cache_var	= 'ar_cache_'.$val;
+
+			if (count($this->$ar_cache_var) == 0)
+			{
+				continue;
+			}
+
+			$this->$ar_variable = array_unique(array_merge($this->$ar_cache_var, $this->$ar_variable));
+		}
+
+		// If we are "protecting identifiers" we need to examine the "from"
+		// portion of the query to determine if there are any aliases
+		if ($this->_protect_identifiers === TRUE AND count($this->ar_cache_from) > 0)
+		{
+			$this->_track_aliases($this->ar_from);
+		}
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Resets the active record values.  Called by the get() function
+	 *
+	 * @access	private
+	 * @param	array	An array of fields to reset
+	 * @return	void
+	 */
+	function _reset_run($ar_reset_items)
+	{
+		foreach ($ar_reset_items as $item => $default_value)
+		{
+			if ( ! in_array($item, $this->ar_store_array))
+			{
+				$this->$item = $default_value;
+			}
+		}
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Resets the active record values.  Called by the get() function
+	 *
+	 * @access	private
+	 * @return	void
+	 */
+	function _reset_select()
+	{
+		$ar_reset_items = array(
+								'ar_select'			=> array(), 
+								'ar_from'			=> array(), 
+								'ar_join'			=> array(), 
+								'ar_where'			=> array(), 
+								'ar_like'			=> array(), 
+								'ar_groupby'		=> array(), 
+								'ar_having'			=> array(), 
+								'ar_orderby'		=> array(), 
+								'ar_wherein'		=> array(), 
+								'ar_aliased_tables'	=> array(),
+								'ar_distinct'		=> FALSE, 
+								'ar_limit'			=> FALSE, 
+								'ar_offset'			=> FALSE, 
+								'ar_order'			=> FALSE,
+							);
+		
+		$this->_reset_run($ar_reset_items);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Resets the active record "write" values.
+	 *
+	 * Called by the insert() update() and delete() functions
+	 *
+	 * @access	private
+	 * @return	void
+	 */
+	function _reset_write()
+	{	
+		$ar_reset_items = array(
+								'ar_set'		=> array(), 
+								'ar_from'		=> array(), 
+								'ar_where'		=> array(), 
+								'ar_like'		=> array(),
+								'ar_orderby'	=> array(), 
+								'ar_limit'		=> FALSE, 
+								'ar_order'		=> FALSE
+								);
+
+		$this->_reset_run($ar_reset_items);
+	}
+	
+}
+
+/* End of file DB_active_rec.php */
+/* Location: ./system/database/DB_active_rec.php */
\ No newline at end of file