<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 5.1.6 or newer

 *

 * @package		CodeIgniter

 * @author		ExpressionEngine Dev Team

 * @copyright	Copyright (c) 2008 - 2011, 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_keys				= 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();

	

	var $ar_no_escape 			= array();

	var $ar_cache_no_escape     = array();



	// --------------------------------------------------------------------



	/**

	 * Select

	 *

	 * Generates the SELECT portion of the query

	 *

	 * @param	string

	 * @return	object

	 */

	public function select($select = '*', $escape = NULL)

	{

		if (is_string($select))

		{

			$select = explode(',', $select);

		}



		foreach ($select as $val)

		{

			$val = trim($val);



			if ($val != '')

			{

				$this->ar_select[] = $val;

				$this->ar_no_escape[] = $escape;



				if ($this->ar_caching === TRUE)

				{

					$this->ar_cache_select[] = $val;

					$this->ar_cache_exists[] = 'select';

					$this->ar_cache_no_escape[] = $escape;

				}

			}

		}

		return $this;

	}



	// --------------------------------------------------------------------



	/**

	 * Select Max

	 *

	 * Generates a SELECT MAX(field) portion of a query

	 *

	 * @param	string	the field

	 * @param	string	an alias

	 * @return	object

	 */

	public 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

	 *

	 * @param	string	the field

	 * @param	string	an alias

	 * @return	object

	 */

	public 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

	 *

	 * @param	string	the field

	 * @param	string	an alias

	 * @return	object

	 */

	public 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

	 *

	 * @param	string	the field

	 * @param	string	an alias

	 * @return	object

	 */

	public 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()

	 *

	 * @param	string	the field

	 * @param	string	an alias

	 * @return	object

	 */

	protected 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

	 *

	 * @param	string

	 * @return	string

	 */

	protected 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

	 *

	 * @param	bool

	 * @return	object

	 */

	public function distinct($val = TRUE)

	{

		$this->ar_distinct = (is_bool($val)) ? $val : TRUE;

		return $this;

	}



	// --------------------------------------------------------------------



	/**

	 * From

	 *

	 * Generates the FROM portion of the query

	 *

	 * @param	mixed	can be a string or array

	 * @return	object

	 */

	public 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

	 *

	 * @param	string

	 * @param	string	the join condition

	 * @param	string	the type of join

	 * @return	object

	 */

	public 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

	 *

	 * @param	mixed

	 * @param	mixed

	 * @return	object

	 */

	public 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

	 *

	 * @param	mixed

	 * @param	mixed

	 * @return	object

	 */

	public function or_where($key, $value = NULL, $escape = TRUE)

	{

		return $this->_where($key, $value, 'OR ', $escape);

	}



	// --------------------------------------------------------------------



	/**

	 * Where

	 *

	 * Called by where() or or_where()

	 *

	 * @param	mixed

	 * @param	mixed

	 * @param	string

	 * @return	object

	 */

	protected 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

	 *

	 * @param	string	The field to search

	 * @param	array	The values searched on

	 * @return	object

	 */

	public 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

	 *

	 * @param	string	The field to search

	 * @param	array	The values searched on

	 * @return	object

	 */

	public 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

	 *

	 * @param	string	The field to search

	 * @param	array	The values searched on

	 * @return	object

	 */

	public 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

	 *

	 * @param	string	The field to search

	 * @param	array	The values searched on

	 * @return	object

	 */

	public 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

	 *

	 * @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

	 */

	protected 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

	 *

	 * @param	mixed

	 * @param	mixed

	 * @return	object

	 */

	public 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

	 *

	 * @param	mixed

	 * @param	mixed

	 * @return	object

	 */

	public 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

	 *

	 * @param	mixed

	 * @param	mixed

	 * @return	object

	 */

	public 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

	 *

	 * @param	mixed

	 * @param	mixed

	 * @return	object

	 */

	public function or_not_like($field, $match = '', $side = 'both')

	{

		return $this->_like($field, $match, 'OR ', $side, 'NOT');

	}



	// --------------------------------------------------------------------



	/**

	 * Like

	 *

	 * Called by like() or orlike()

	 *

	 * @param	mixed

	 * @param	mixed

	 * @param	string

	 * @return	object

	 */

	protected 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 == 'none')

			{

				$like_statement = $prefix." $k $not LIKE '{$v}'";

			}

			elseif ($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_chr);

			}



			$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

	 *

	 * @param	string

	 * @return	object

	 */

	public 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;

	}



	// --------------------------------------------------------------------



	/**

	 * Sets the HAVING value

	 *

	 * Separates multiple calls with AND

	 *

	 * @param	string

	 * @param	string

	 * @return	object

	 */

	public function having($key, $value = '', $escape = TRUE)

	{

		return $this->_having($key, $value, 'AND ', $escape);

	}



	// --------------------------------------------------------------------



	/**

	 * Sets the OR HAVING value

	 *

	 * Separates multiple calls with OR

	 *

	 * @param	string

	 * @param	string

	 * @return	object

	 */

	public function or_having($key, $value = '', $escape = TRUE)

	{

		return $this->_having($key, $value, 'OR ', $escape);

	}



	// --------------------------------------------------------------------



	/**

	 * Sets the HAVING values

	 *

	 * Called by having() or or_having()

	 *

	 * @param	string

	 * @param	string

	 * @return	object

	 */

	protected 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($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

	 *

	 * @param	string

	 * @param	string	direction: asc or desc

	 * @return	object

	 */

	public 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;

	}



	// --------------------------------------------------------------------



	/**

	 * Sets the LIMIT value

	 *

	 * @param	integer	the limit value

	 * @param	integer	the offset value

	 * @return	object

	 */

	public function limit($value, $offset = '')

	{

		$this->ar_limit = (int) $value;



		if ($offset != '')

		{

			$this->ar_offset = (int) $offset;

		}



		return $this;

	}



	// --------------------------------------------------------------------



	/**

	 * Sets the OFFSET value

	 *

	 * @param	integer	the offset value

	 * @return	object

	 */

	public function offset($offset)

	{

		$this->ar_offset = $offset;

		return $this;

	}



	// --------------------------------------------------------------------



	/**

	 * The "set" function.  Allows key/value pairs to be set for inserting or updating

	 *

	 * @param	mixed

	 * @param	string

	 * @param	boolean

	 * @return	object

	 */

	public 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, FALSE, TRUE)] = $this->escape($v);

			}

		}



		return $this;

	}



	// --------------------------------------------------------------------



	/**

	 * Get

	 *

	 * Compiles the select statement based on the other functions called

	 * and runs the query

	 *

	 * @param	string	the table

	 * @param	string	the limit clause

	 * @param	string	the offset clause

	 * @return	object

	 */

	public 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.

	 *

	 * @param	string

	 * @return	string

	 */

	public 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 (int) $row->numrows;

	}



	// --------------------------------------------------------------------



	/**

	 * Get_Where

	 *

	 * Allows the where clause, limit and offset to be added directly

	 *

	 * @param	string	the where clause

	 * @param	string	the limit clause

	 * @param	string	the offset clause

	 * @return	object

	 */

	public 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;

	}



	// --------------------------------------------------------------------



	/**

	 * Insert_Batch

	 *

	 * Compiles batch insert strings and runs the queries

	 *

	 * @param	string	the table to retrieve the results from

	 * @param	array	an associative array of insert values

	 * @return	object

	 */

	public function insert_batch($table = '', $set = NULL)

	{

		if ( ! is_null($set))

		{

			$this->set_insert_batch($set);

		}



		if (count($this->ar_set) == 0)

		{

			if ($this->db_debug)

			{

				//No valid data array.  Folds in cases where keys and values did not match up

				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];

		}



		// Batch this baby

		for ($i = 0, $total = count($this->ar_set); $i < $total; $i = $i + 100)

		{



			$sql = $this->_insert_batch($this->_protect_identifiers($table, TRUE, NULL, FALSE), $this->ar_keys, array_slice($this->ar_set, $i, 100));



			//echo $sql;



			$this->query($sql);

		}



		$this->_reset_write();





		return TRUE;

	}



	// --------------------------------------------------------------------



	/**

	 * The "set_insert_batch" function.  Allows key/value pairs to be set for batch inserts

	 *

	 * @param	mixed

	 * @param	string

	 * @param	boolean

	 * @return	object

	 */

	public function set_insert_batch($key, $value = '', $escape = TRUE)

	{

		$key = $this->_object_to_array_batch($key);



		if ( ! is_array($key))

		{

			$key = array($key => $value);

		}



		$keys = array_keys(current($key));

		sort($keys);



		foreach ($key as $row)

		{

			if (count(array_diff($keys, array_keys($row))) > 0 OR count(array_diff(array_keys($row), $keys)) > 0)

			{

				// batch function above returns an error on an empty array

				$this->ar_set[] = array();

				return;

			}



			ksort($row); // puts $row in the same order as our keys



			if ($escape === FALSE)

			{

				$this->ar_set[] =  '('.implode(',', $row).')';

			}

			else

			{

				$clean = array();



				foreach ($row as $value)

				{

					$clean[] = $this->escape($value);

				}



				$this->ar_set[] =  '('.implode(',', $clean).')';

			}

		}



		foreach ($keys as $k)

		{

			$this->ar_keys[] = $this->_protect_identifiers($k);

		}



		return $this;

	}



	// --------------------------------------------------------------------



	/**

	 * Insert

	 *

	 * Compiles an insert string and runs the query

	 *

	 * @param	string	the table to insert data into

	 * @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);

	}



	// --------------------------------------------------------------------



	/**

	 * Replace

	 *

	 * Compiles an replace into string and runs the query

	 *

	 * @param	string	the table to replace data into

	 * @param	array	an associative array of insert values

	 * @return	object

	 */

	public function replace($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 = $this->_replace($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

	 *

	 * @param	string	the table to retrieve the results from

	 * @param	array	an associative array of update values

	 * @param	mixed	the where clause

	 * @return	object

	 */

	public 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);

	}





	// --------------------------------------------------------------------



	/**

	 * Update_Batch

	 *

	 * Compiles an update string and runs the query

	 *

	 * @param	string	the table to retrieve the results from

	 * @param	array	an associative array of update values

	 * @param	string	the where key

	 * @return	object

	 */

	public function update_batch($table = '', $set = NULL, $index = NULL)

	{

		// Combine any cached components with the current statements

		$this->_merge_cache();



		if (is_null($index))

		{

			if ($this->db_debug)

			{

				return $this->display_error('db_must_use_index');

			}



			return FALSE;

		}



		if ( ! is_null($set))

		{

			$this->set_update_batch($set, $index);

		}



		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];

		}



		// Batch this baby

		for ($i = 0, $total = count($this->ar_set); $i < $total; $i = $i + 100)

		{

			$sql = $this->_update_batch($this->_protect_identifiers($table, TRUE, NULL, FALSE), array_slice($this->ar_set, $i, 100), $this->_protect_identifiers($index), $this->ar_where);



			$this->query($sql);

		}



		$this->_reset_write();

	}



	// --------------------------------------------------------------------



	/**

	 * The "set_update_batch" function.  Allows key/value pairs to be set for batch updating

	 *

	 * @param	array

	 * @param	string

	 * @param	boolean

	 * @return	object

	 */

	public function set_update_batch($key, $index = '', $escape = TRUE)

	{

		$key = $this->_object_to_array_batch($key);



		if ( ! is_array($key))

		{

			// @todo error

		}



		foreach ($key as $k => $v)

		{

			$index_set = FALSE;

			$clean = array();



			foreach ($v as $k2 => $v2)

			{

				if ($k2 == $index)

				{

					$index_set = TRUE;

				}

				else

				{

					$not[] = $k2.'-'.$v2;

				}



				if ($escape === FALSE)

				{

					$clean[$this->_protect_identifiers($k2)] = $v2;

				}

				else

				{

					$clean[$this->_protect_identifiers($k2)] = $this->escape($v2);

				}

			}



			if ($index_set == FALSE)

			{

				return $this->display_error('db_batch_missing_index');

			}



			$this->ar_set[] = $clean;

		}



		return $this;

	}



	// --------------------------------------------------------------------



	/**

	 * Empty Table

	 *

	 * Compiles a delete string and runs "DELETE FROM table"

	 *

	 * @param	string	the table to empty

	 * @return	object

	 */

	public 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"

	 *

	 * @param	string	the table to truncate

	 * @return	object

	 */

	public 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

	 *

	 * @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

	 */

	public 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

	 *

	 * @param	string	the table

	 * @return	string

	 */

	public function dbprefix($table = '')

	{

		if ($table == '')

		{

			$this->display_error('db_table_name_required');

		}



		return $this->dbprefix.$table;

	}



	// --------------------------------------------------------------------



	/**

	 * Set DB Prefix

	 *

	 * Set's the DB Prefix to something new without needing to reconnect

	 *

	 * @param	string	the prefix

	 * @return	string

	 */

	public function set_dbprefix($prefix = '')

	{

		return $this->dbprefix = $prefix;

	}



	// --------------------------------------------------------------------



	/**

	 * Track Aliases

	 *

	 * Used to track SQL statements written with aliased tables.

	 *

	 * @param	string	The table to inspect

	 * @return	string

	 */

	protected 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('/\s+AS\s+/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.

	 *

	 * @return	string

	 */

	protected 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)

				{

					$no_escape = isset($this->ar_no_escape[$key]) ? $this->ar_no_escape[$key] : NULL;

					$this->ar_select[$key] = $this->_protect_identifiers($val, FALSE, $no_escape);

				}



				$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 .= "\nWHERE ";

		}



		$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

	 *

	 * @param	object

	 * @return	array

	 */

	public 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')

			{

				$array[$key] = $val;

			}

		}



		return $array;

	}



	// --------------------------------------------------------------------



	/**

	 * Object to Array

	 *

	 * Takes an object as input and converts the class variables to array key/vals

	 *

	 * @param	object

	 * @return	array

	 */

	public function _object_to_array_batch($object)

	{

		if ( ! is_object($object))

		{

			return $object;

		}



		$array = array();

		$out = get_object_vars($object);

		$fields = array_keys($out);



		foreach ($fields as $val)

		{

			// There are some built in keys we need to ignore for this conversion

			if ($val != '_parent_name')

			{



				$i = 0;

				foreach ($out[$val] as $data)

				{

					$array[$i][$val] = $data;

					$i++;

				}

			}

		}



		return $array;

	}



	// --------------------------------------------------------------------



	/**

	 * Start Cache

	 *

	 * Starts AR caching

	 *

	 * @return	void

	 */

	public function start_cache()

	{

		$this->ar_caching = TRUE;

	}



	// --------------------------------------------------------------------



	/**

	 * Stop Cache

	 *

	 * Stops AR caching

	 *

	 * @return	void

	 */

	public function stop_cache()

	{

		$this->ar_caching = FALSE;

	}



	// --------------------------------------------------------------------



	/**

	 * Flush Cache

	 *

	 * Empties the AR cache

	 *

	 * @access	public

	 * @return	void

	 */

	public 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(),

			'ar_cache_no_escape'	=> array()

		));

	}



	// --------------------------------------------------------------------



	/**

	 * Merge Cache

	 *

	 * When called, this function merges any cached AR arrays with

	 * locally called ones.

	 *

	 * @return	void

	 */

	protected 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);

		}



		$this->ar_no_escape = $this->ar_cache_no_escape;

	}



	// --------------------------------------------------------------------



	/**

	 * Resets the active record values.  Called by the get() function

	 *

	 * @param	array	An array of fields to reset

	 * @return	void

	 */

	protected 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

	 *

	 * @return	void

	 */

	protected 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_no_escape'		=> 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() insert_batch() update_batch() and delete() functions

	 *

	 * @return	void

	 */

	protected function _reset_write()

	{

		$ar_reset_items = array(

			'ar_set'		=> array(),

			'ar_from'		=> array(),

			'ar_where'		=> array(),

			'ar_like'		=> array(),

			'ar_orderby'	=> array(),

			'ar_keys'		=> 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 */