<?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 - 2010, 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_chr); } $this->ar_like[] = $like_statement; if ($this->ar_caching === TRUE) { $this->ar_cache_like[] = $like_statement; $this->ar_cache_exists[] = 'like'; } } return $this; } // -------------------------------------------------------------------- /** * GROUP BY * * @access public * @param string * @return object */ function group_by($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 */