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<?php/*** CodeIgniter** An open source application development framework for PHP** This content is released under the MIT License (MIT)** Copyright (c) 2014 - 2017, British Columbia Institute of Technology** Permission is hereby granted, free of charge, to any person obtaining a copy* of this software and associated documentation files (the "Software"), to deal* in the Software without restriction, including without limitation the rights* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell* copies of the Software, and to permit persons to whom the Software is* furnished to do so, subject to the following conditions:** The above copyright notice and this permission notice shall be included in* all copies or substantial portions of the Software.** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN* THE SOFTWARE.** @package CodeIgniter* @author EllisLab Dev Team* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)* @copyright Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)* @license http://opensource.org/licenses/MIT MIT License* @link https://codeigniter.com* @since Version 1.0.0* @filesource*/defined('BASEPATH') OR exit('No direct script access allowed');/*** Query Builder Class** This is the platform-independent base Query Builder implementation class.** @package CodeIgniter* @subpackage Drivers* @category Database* @author EllisLab Dev Team* @link https://codeigniter.com/user_guide/database/*/abstract class CI_DB_query_builder extends CI_DB_driver {/*** Return DELETE SQL flag** @var bool*/protected $return_delete_sql = FALSE;/*** Reset DELETE data flag** @var bool*/protected $reset_delete_data = FALSE;/*** QB SELECT data** @var array*/protected $qb_select = array();/*** QB DISTINCT flag** @var bool*/protected $qb_distinct = FALSE;/*** QB FROM data** @var array*/protected $qb_from = array();/*** QB JOIN data** @var array*/protected $qb_join = array();/*** QB WHERE data** @var array*/protected $qb_where = array();/*** QB GROUP BY data** @var array*/protected $qb_groupby = array();/*** QB HAVING data** @var array*/protected $qb_having = array();/*** QB keys** @var array*/protected $qb_keys = array();/*** QB LIMIT data** @var int*/protected $qb_limit = FALSE;/*** QB OFFSET data** @var int*/protected $qb_offset = FALSE;/*** QB ORDER BY data** @var array*/protected $qb_orderby = array();/*** QB data sets** @var array*/protected $qb_set = array();/*** QB data set for update_batch()** @var array*/protected $qb_set_ub = array();/*** QB aliased tables list** @var array*/protected $qb_aliased_tables = array();/*** QB WHERE group started flag** @var bool*/protected $qb_where_group_started = FALSE;/*** QB WHERE group count** @var int*/protected $qb_where_group_count = 0;// Query Builder Caching variables/*** QB Caching flag** @var bool*/protected $qb_caching = FALSE;/*** QB Cache exists list** @var array*/protected $qb_cache_exists = array();/*** QB Cache SELECT data** @var array*/protected $qb_cache_select = array();/*** QB Cache FROM data** @var array*/protected $qb_cache_from = array();/*** QB Cache JOIN data** @var array*/protected $qb_cache_join = array();/*** QB Cache WHERE data** @var array*/protected $qb_cache_where = array();/*** QB Cache GROUP BY data** @var array*/protected $qb_cache_groupby = array();/*** QB Cache HAVING data** @var array*/protected $qb_cache_having = array();/*** QB Cache ORDER BY data** @var array*/protected $qb_cache_orderby = array();/*** QB Cache data sets** @var array*/protected $qb_cache_set = array();/*** QB No Escape data** @var array*/protected $qb_no_escape = array();/*** QB Cache No Escape data** @var array*/protected $qb_cache_no_escape = array();// --------------------------------------------------------------------/*** Select** Generates the SELECT portion of the query** @param string* @param mixed* @return CI_DB_query_builder*/public function select($select = '*', $escape = NULL){if (is_string($select)){$select = explode(',', $select);}// If the escape value was not set, we will base it on the global settingis_bool($escape) OR $escape = $this->_protect_identifiers;foreach ($select as $val){$val = trim($val);if ($val !== ''){$this->qb_select[] = $val;$this->qb_no_escape[] = $escape;if ($this->qb_caching === TRUE){$this->qb_cache_select[] = $val;$this->qb_cache_exists[] = 'select';$this->qb_cache_no_escape[] = $escape;}}}return $this;}// --------------------------------------------------------------------/*** Select Max** Generates a SELECT MAX(field) portion of a query** @param string the field* @param string an alias* @return CI_DB_query_builder*/public function select_max($select = '', $alias = ''){return $this->_max_min_avg_sum($select, $alias, 'MAX');}// --------------------------------------------------------------------/*** Select Min** Generates a SELECT MIN(field) portion of a query** @param string the field* @param string an alias* @return CI_DB_query_builder*/public function select_min($select = '', $alias = ''){return $this->_max_min_avg_sum($select, $alias, 'MIN');}// --------------------------------------------------------------------/*** Select Average** Generates a SELECT AVG(field) portion of a query** @param string the field* @param string an alias* @return CI_DB_query_builder*/public function select_avg($select = '', $alias = ''){return $this->_max_min_avg_sum($select, $alias, 'AVG');}// --------------------------------------------------------------------/*** Select Sum** Generates a SELECT SUM(field) portion of a query** @param string the field* @param string an alias* @return CI_DB_query_builder*/public function select_sum($select = '', $alias = ''){return $this->_max_min_avg_sum($select, $alias, 'SUM');}// --------------------------------------------------------------------/*** SELECT [MAX|MIN|AVG|SUM]()** @used-by select_max()* @used-by select_min()* @used-by select_avg()* @used-by select_sum()** @param string $select Field name* @param string $alias* @param string $type* @return CI_DB_query_builder*/protected function _max_min_avg_sum($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($select)).') AS '.$this->escape_identifiers(trim($alias));$this->qb_select[] = $sql;$this->qb_no_escape[] = NULL;if ($this->qb_caching === TRUE){$this->qb_cache_select[] = $sql;$this->qb_cache_exists[] = 'select';}return $this;}// --------------------------------------------------------------------/*** Determines the alias name based on the table** @param string $item* @return string*/protected function _create_alias_from_table($item){if (strpos($item, '.') !== FALSE){$item = explode('.', $item);return end($item);}return $item;}// --------------------------------------------------------------------/*** DISTINCT** Sets a flag which tells the query string compiler to add DISTINCT** @param bool $val* @return CI_DB_query_builder*/public function distinct($val = TRUE){$this->qb_distinct = is_bool($val) ? $val : TRUE;return $this;}// --------------------------------------------------------------------/*** From** Generates the FROM portion of the query** @param mixed $from can be a string or array* @return CI_DB_query_builder*/public function from($from){foreach ((array) $from as $val){if (strpos($val, ',') !== FALSE){foreach (explode(',', $val) as $v){$v = trim($v);$this->_track_aliases($v);$this->qb_from[] = $v = $this->protect_identifiers($v, TRUE, NULL, FALSE);if ($this->qb_caching === TRUE){$this->qb_cache_from[] = $v;$this->qb_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->qb_from[] = $val = $this->protect_identifiers($val, TRUE, NULL, FALSE);if ($this->qb_caching === TRUE){$this->qb_cache_from[] = $val;$this->qb_cache_exists[] = 'from';}}}return $this;}// --------------------------------------------------------------------/*** JOIN** Generates the JOIN portion of the query** @param string* @param string the join condition* @param string the type of join* @param string whether not to try to escape identifiers* @return CI_DB_query_builder*/public function join($table, $cond, $type = '', $escape = NULL){if ($type !== ''){$type = strtoupper(trim($type));if ( ! in_array($type, array('LEFT', 'RIGHT', 'OUTER', 'INNER', 'LEFT OUTER', 'RIGHT OUTER'), TRUE)){$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($table);is_bool($escape) OR $escape = $this->_protect_identifiers;if ( ! $this->_has_operator($cond)){$cond = ' USING ('.($escape ? $this->escape_identifiers($cond) : $cond).')';}elseif ($escape === FALSE){$cond = ' ON '.$cond;}else{// Split multiple conditionsif (preg_match_all('/\sAND\s|\sOR\s/i', $cond, $joints, PREG_OFFSET_CAPTURE)){$conditions = array();$joints = $joints[0];array_unshift($joints, array('', 0));for ($i = count($joints) - 1, $pos = strlen($cond); $i >= 0; $i--){$joints[$i][1] += strlen($joints[$i][0]); // offset$conditions[$i] = substr($cond, $joints[$i][1], $pos - $joints[$i][1]);$pos = $joints[$i][1] - strlen($joints[$i][0]);$joints[$i] = $joints[$i][0];}}else{$conditions = array($cond);$joints = array('');}$cond = ' ON ';for ($i = 0, $c = count($conditions); $i < $c; $i++){$operator = $this->_get_operator($conditions[$i]);$cond .= $joints[$i];$cond .= preg_match("/(\(*)?([\[\]\w\.'-]+)".preg_quote($operator)."(.*)/i", $conditions[$i], $match)? $match[1].$this->protect_identifiers($match[2]).$operator.$this->protect_identifiers($match[3]): $conditions[$i];}}// Do we want to escape the table name?if ($escape === TRUE){$table = $this->protect_identifiers($table, TRUE, NULL, FALSE);}// Assemble the JOIN statement$this->qb_join[] = $join = $type.'JOIN '.$table.$cond;if ($this->qb_caching === TRUE){$this->qb_cache_join[] = $join;$this->qb_cache_exists[] = 'join';}return $this;}// --------------------------------------------------------------------/*** WHERE** Generates the WHERE portion of the query.* Separates multiple calls with 'AND'.** @param mixed* @param mixed* @param bool* @return CI_DB_query_builder*/public function where($key, $value = NULL, $escape = NULL){return $this->_wh('qb_where', $key, $value, 'AND ', $escape);}// --------------------------------------------------------------------/*** OR WHERE** Generates the WHERE portion of the query.* Separates multiple calls with 'OR'.** @param mixed* @param mixed* @param bool* @return CI_DB_query_builder*/public function or_where($key, $value = NULL, $escape = NULL){return $this->_wh('qb_where', $key, $value, 'OR ', $escape);}// --------------------------------------------------------------------/*** WHERE, HAVING** @used-by where()* @used-by or_where()* @used-by having()* @used-by or_having()** @param string $qb_key 'qb_where' or 'qb_having'* @param mixed $key* @param mixed $value* @param string $type* @param bool $escape* @return CI_DB_query_builder*/protected function _wh($qb_key, $key, $value = NULL, $type = 'AND ', $escape = NULL){$qb_cache_key = ($qb_key === 'qb_having') ? 'qb_cache_having' : 'qb_cache_where';if ( ! is_array($key)){$key = array($key => $value);}// If the escape value was not set will base it on the global settingis_bool($escape) OR $escape = $this->_protect_identifiers;foreach ($key as $k => $v){$prefix = (count($this->$qb_key) === 0 && count($this->$qb_cache_key) === 0)? $this->_group_get_type(''): $this->_group_get_type($type);if ($v !== NULL){if ($escape === TRUE){$v = ' '.$this->escape($v);}if ( ! $this->_has_operator($k)){$k .= ' = ';}}elseif ( ! $this->_has_operator($k)){// value appears not to have been set, assign the test to IS NULL$k .= ' IS NULL';}elseif (preg_match('/\s*(!?=|<>|\sIS(?:\s+NOT)?\s)\s*$/i', $k, $match, PREG_OFFSET_CAPTURE)){$k = substr($k, 0, $match[0][1]).($match[1][0] === '=' ? ' IS NULL' : ' IS NOT NULL');}$this->{$qb_key}[] = array('condition' => $prefix.$k.$v, 'escape' => $escape);if ($this->qb_caching === TRUE){$this->{$qb_cache_key}[] = array('condition' => $prefix.$k.$v, 'escape' => $escape);$this->qb_cache_exists[] = substr($qb_key, 3);}}return $this;}// --------------------------------------------------------------------/*** WHERE IN** Generates a WHERE field IN('item', 'item') SQL query,* joined with 'AND' if appropriate.** @param string $key The field to search* @param array $values The values searched on* @param bool $escape* @return CI_DB_query_builder*/public function where_in($key = NULL, $values = NULL, $escape = NULL){return $this->_where_in($key, $values, FALSE, 'AND ', $escape);}// --------------------------------------------------------------------/*** OR WHERE IN** Generates a WHERE field IN('item', 'item') SQL query,* joined with 'OR' if appropriate.** @param string $key The field to search* @param array $values The values searched on* @param bool $escape* @return CI_DB_query_builder*/public function or_where_in($key = NULL, $values = NULL, $escape = NULL){return $this->_where_in($key, $values, FALSE, 'OR ', $escape);}// --------------------------------------------------------------------/*** WHERE NOT IN** Generates a WHERE field NOT IN('item', 'item') SQL query,* joined with 'AND' if appropriate.** @param string $key The field to search* @param array $values The values searched on* @param bool $escape* @return CI_DB_query_builder*/public function where_not_in($key = NULL, $values = NULL, $escape = NULL){return $this->_where_in($key, $values, TRUE, 'AND ', $escape);}// --------------------------------------------------------------------/*** OR WHERE NOT IN** Generates a WHERE field NOT IN('item', 'item') SQL query,* joined with 'OR' if appropriate.** @param string $key The field to search* @param array $values The values searched on* @param bool $escape* @return CI_DB_query_builder*/public function or_where_not_in($key = NULL, $values = NULL, $escape = NULL){return $this->_where_in($key, $values, TRUE, 'OR ', $escape);}// --------------------------------------------------------------------/*** Internal WHERE IN** @used-by where_in()* @used-by or_where_in()* @used-by where_not_in()* @used-by or_where_not_in()** @param string $key The field to search* @param array $values The values searched on* @param bool $not If the statement would be IN or NOT IN* @param string $type* @param bool $escape* @return CI_DB_query_builder*/protected function _where_in($key = NULL, $values = NULL, $not = FALSE, $type = 'AND ', $escape = NULL){if ($key === NULL OR $values === NULL){return $this;}if ( ! is_array($values)){$values = array($values);}is_bool($escape) OR $escape = $this->_protect_identifiers;$not = ($not) ? ' NOT' : '';if ($escape === TRUE){$where_in = array();foreach ($values as $value){$where_in[] = $this->escape($value);}}else{$where_in = array_values($values);}$prefix = (count($this->qb_where) === 0 && count($this->qb_cache_where) === 0)? $this->_group_get_type(''): $this->_group_get_type($type);$where_in = array('condition' => $prefix.$key.$not.' IN('.implode(', ', $where_in).')','escape' => $escape);$this->qb_where[] = $where_in;if ($this->qb_caching === TRUE){$this->qb_cache_where[] = $where_in;$this->qb_cache_exists[] = 'where';}return $this;}// --------------------------------------------------------------------/*** LIKE** Generates a %LIKE% portion of the query.* Separates multiple calls with 'AND'.** @param mixed $field* @param string $match* @param string $side* @param bool $escape* @return CI_DB_query_builder*/public function like($field, $match = '', $side = 'both', $escape = NULL){return $this->_like($field, $match, 'AND ', $side, '', $escape);}// --------------------------------------------------------------------/*** NOT LIKE** Generates a NOT LIKE portion of the query.* Separates multiple calls with 'AND'.** @param mixed $field* @param string $match* @param string $side* @param bool $escape* @return CI_DB_query_builder*/public function not_like($field, $match = '', $side = 'both', $escape = NULL){return $this->_like($field, $match, 'AND ', $side, 'NOT', $escape);}// --------------------------------------------------------------------/*** OR LIKE** Generates a %LIKE% portion of the query.* Separates multiple calls with 'OR'.** @param mixed $field* @param string $match* @param string $side* @param bool $escape* @return CI_DB_query_builder*/public function or_like($field, $match = '', $side = 'both', $escape = NULL){return $this->_like($field, $match, 'OR ', $side, '', $escape);}// --------------------------------------------------------------------/*** OR NOT LIKE** Generates a NOT LIKE portion of the query.* Separates multiple calls with 'OR'.** @param mixed $field* @param string $match* @param string $side* @param bool $escape* @return CI_DB_query_builder*/public function or_not_like($field, $match = '', $side = 'both', $escape = NULL){return $this->_like($field, $match, 'OR ', $side, 'NOT', $escape);}// --------------------------------------------------------------------/*** Internal LIKE** @used-by like()* @used-by or_like()* @used-by not_like()* @used-by or_not_like()** @param mixed $field* @param string $match* @param string $type* @param string $side* @param string $not* @param bool $escape* @return CI_DB_query_builder*/protected function _like($field, $match = '', $type = 'AND ', $side = 'both', $not = '', $escape = NULL){if ( ! is_array($field)){$field = array($field => $match);}is_bool($escape) OR $escape = $this->_protect_identifiers;// lowercase $side in case somebody writes e.g. 'BEFORE' instead of 'before' (doh)$side = strtolower($side);foreach ($field as $k => $v){$prefix = (count($this->qb_where) === 0 && count($this->qb_cache_where) === 0)? $this->_group_get_type('') : $this->_group_get_type($type);if ($escape === TRUE){$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 '%{$v}%'";}// some platforms require an escape sequence definition for LIKE wildcardsif ($escape === TRUE && $this->_like_escape_str !== ''){$like_statement .= sprintf($this->_like_escape_str, $this->_like_escape_chr);}$this->qb_where[] = array('condition' => $like_statement, 'escape' => $escape);if ($this->qb_caching === TRUE){$this->qb_cache_where[] = array('condition' => $like_statement, 'escape' => $escape);$this->qb_cache_exists[] = 'where';}}return $this;}// --------------------------------------------------------------------/*** Starts a query group.** @param string $not (Internal use only)* @param string $type (Internal use only)* @return CI_DB_query_builder*/public function group_start($not = '', $type = 'AND '){$type = $this->_group_get_type($type);$this->qb_where_group_started = TRUE;$prefix = (count($this->qb_where) === 0 && count($this->qb_cache_where) === 0) ? '' : $type;$where = array('condition' => $prefix.$not.str_repeat(' ', ++$this->qb_where_group_count).' (','escape' => FALSE);$this->qb_where[] = $where;if ($this->qb_caching){$this->qb_cache_where[] = $where;}return $this;}// --------------------------------------------------------------------/*** Starts a query group, but ORs the group** @return CI_DB_query_builder*/public function or_group_start(){return $this->group_start('', 'OR ');}// --------------------------------------------------------------------/*** Starts a query group, but NOTs the group** @return CI_DB_query_builder*/public function not_group_start(){return $this->group_start('NOT ', 'AND ');}// --------------------------------------------------------------------/*** Starts a query group, but OR NOTs the group** @return CI_DB_query_builder*/public function or_not_group_start(){return $this->group_start('NOT ', 'OR ');}// --------------------------------------------------------------------/*** Ends a query group** @return CI_DB_query_builder*/public function group_end(){$this->qb_where_group_started = FALSE;$where = array('condition' => str_repeat(' ', $this->qb_where_group_count--).')','escape' => FALSE);$this->qb_where[] = $where;if ($this->qb_caching){$this->qb_cache_where[] = $where;}return $this;}// --------------------------------------------------------------------/*** Group_get_type** @used-by group_start()* @used-by _like()* @used-by _wh()* @used-by _where_in()** @param string $type* @return string*/protected function _group_get_type($type){if ($this->qb_where_group_started){$type = '';$this->qb_where_group_started = FALSE;}return $type;}// --------------------------------------------------------------------/*** GROUP BY** @param string $by* @param bool $escape* @return CI_DB_query_builder*/public function group_by($by, $escape = NULL){is_bool($escape) OR $escape = $this->_protect_identifiers;if (is_string($by)){$by = ($escape === TRUE)? explode(',', $by): array($by);}foreach ($by as $val){$val = trim($val);if ($val !== ''){$val = array('field' => $val, 'escape' => $escape);$this->qb_groupby[] = $val;if ($this->qb_caching === TRUE){$this->qb_cache_groupby[] = $val;$this->qb_cache_exists[] = 'groupby';}}}return $this;}// --------------------------------------------------------------------/*** HAVING** Separates multiple calls with 'AND'.** @param string $key* @param string $value* @param bool $escape* @return CI_DB_query_builder*/public function having($key, $value = NULL, $escape = NULL){return $this->_wh('qb_having', $key, $value, 'AND ', $escape);}// --------------------------------------------------------------------/*** OR HAVING** Separates multiple calls with 'OR'.** @param string $key* @param string $value* @param bool $escape* @return CI_DB_query_builder*/public function or_having($key, $value = NULL, $escape = NULL){return $this->_wh('qb_having', $key, $value, 'OR ', $escape);}// --------------------------------------------------------------------/*** ORDER BY** @param string $orderby* @param string $direction ASC, DESC or RANDOM* @param bool $escape* @return CI_DB_query_builder*/public function order_by($orderby, $direction = '', $escape = NULL){$direction = strtoupper(trim($direction));if ($direction === 'RANDOM'){$direction = '';// Do we have a seed value?$orderby = ctype_digit((string) $orderby)? sprintf($this->_random_keyword[1], $orderby): $this->_random_keyword[0];}elseif (empty($orderby)){return $this;}elseif ($direction !== ''){$direction = in_array($direction, array('ASC', 'DESC'), TRUE) ? ' '.$direction : '';}is_bool($escape) OR $escape = $this->_protect_identifiers;if ($escape === FALSE){$qb_orderby[] = array('field' => $orderby, 'direction' => $direction, 'escape' => FALSE);}else{$qb_orderby = array();foreach (explode(',', $orderby) as $field){$qb_orderby[] = ($direction === '' && preg_match('/\s+(ASC|DESC)$/i', rtrim($field), $match, PREG_OFFSET_CAPTURE))? array('field' => ltrim(substr($field, 0, $match[0][1])), 'direction' => ' '.$match[1][0], 'escape' => TRUE): array('field' => trim($field), 'direction' => $direction, 'escape' => TRUE);}}$this->qb_orderby = array_merge($this->qb_orderby, $qb_orderby);if ($this->qb_caching === TRUE){$this->qb_cache_orderby = array_merge($this->qb_cache_orderby, $qb_orderby);$this->qb_cache_exists[] = 'orderby';}return $this;}// --------------------------------------------------------------------/*** LIMIT** @param int $value LIMIT value* @param int $offset OFFSET value* @return CI_DB_query_builder*/public function limit($value, $offset = 0){is_null($value) OR $this->qb_limit = (int) $value;empty($offset) OR $this->qb_offset = (int) $offset;return $this;}// --------------------------------------------------------------------/*** Sets the OFFSET value** @param int $offset OFFSET value* @return CI_DB_query_builder*/public function offset($offset){empty($offset) OR $this->qb_offset = (int) $offset;return $this;}// --------------------------------------------------------------------/*** LIMIT string** Generates a platform-specific LIMIT clause.** @param string $sql SQL Query* @return string*/protected function _limit($sql){return $sql.' LIMIT '.($this->qb_offset ? $this->qb_offset.', ' : '').(int) $this->qb_limit;}// --------------------------------------------------------------------/*** The "set" function.** Allows key/value pairs to be set for inserting or updating** @param mixed* @param string* @param bool* @return CI_DB_query_builder*/public function set($key, $value = '', $escape = NULL){$key = $this->_object_to_array($key);if ( ! is_array($key)){$key = array($key => $value);}is_bool($escape) OR $escape = $this->_protect_identifiers;foreach ($key as $k => $v){$this->qb_set[$this->protect_identifiers($k, FALSE, $escape)] = ($escape)? $this->escape($v) : $v;}return $this;}// --------------------------------------------------------------------/*** Get SELECT query string** Compiles a SELECT query string and returns the sql.** @param string the table name to select from (optional)* @param bool TRUE: resets QB values; FALSE: leave QB values alone* @return string*/public function get_compiled_select($table = '', $reset = TRUE){if ($table !== ''){$this->_track_aliases($table);$this->from($table);}$select = $this->_compile_select();if ($reset === TRUE){$this->_reset_select();}return $select;}// --------------------------------------------------------------------/*** Get** Compiles the select statement based on the other functions called* and runs the query** @param string the table* @param string the limit clause* @param string the offset clause* @return CI_DB_result*/public function get($table = '', $limit = NULL, $offset = NULL){if ($table !== ''){$this->_track_aliases($table);$this->from($table);}if ( ! empty($limit)){$this->limit($limit, $offset);}$result = $this->query($this->_compile_select());$this->_reset_select();return $result;}// --------------------------------------------------------------------/*** "Count All Results" query** Generates a platform-specific query string that counts all records* returned by an Query Builder query.** @param string* @param bool the reset clause* @return int*/public function count_all_results($table = '', $reset = TRUE){if ($table !== ''){$this->_track_aliases($table);$this->from($table);}// ORDER BY usage is often problematic here (most notably// on Microsoft SQL Server) and ultimately unnecessary// for selecting COUNT(*) ...if ( ! empty($this->qb_orderby)){$orderby = $this->qb_orderby;$this->qb_orderby = NULL;}$result = ($this->qb_distinct === TRUE OR ! empty($this->qb_groupby) OR ! empty($this->qb_cache_groupby))? $this->query($this->_count_string.$this->protect_identifiers('numrows')."\nFROM (\n".$this->_compile_select()."\n) CI_count_all_results"): $this->query($this->_compile_select($this->_count_string.$this->protect_identifiers('numrows')));if ($reset === TRUE){$this->_reset_select();}// If we've previously reset the qb_orderby values, get them backelseif ( ! isset($this->qb_orderby)){$this->qb_orderby = $orderby;}if ($result->num_rows() === 0){return 0;}$row = $result->row();return (int) $row->numrows;}// --------------------------------------------------------------------/*** Get_Where** Allows the where clause, limit and offset to be added directly** @param string $table* @param string $where* @param int $limit* @param int $offset* @return CI_DB_result*/public function get_where($table = '', $where = NULL, $limit = NULL, $offset = NULL){if ($table !== ''){$this->from($table);}if ($where !== NULL){$this->where($where);}if ( ! empty($limit)){$this->limit($limit, $offset);}$result = $this->query($this->_compile_select());$this->_reset_select();return $result;}// --------------------------------------------------------------------/*** Insert_Batch** Compiles batch insert strings and runs the queries** @param string $table Table to insert into* @param array $set An associative array of insert values* @param bool $escape Whether to escape values and identifiers* @return int Number of rows inserted or FALSE on failure*/public function insert_batch($table, $set = NULL, $escape = NULL, $batch_size = 100){if ($set === NULL){if (empty($this->qb_set)){return ($this->db_debug) ? $this->display_error('db_must_use_set') : FALSE;}}else{if (empty($set)){return ($this->db_debug) ? $this->display_error('insert_batch() called with no data') : FALSE;}$this->set_insert_batch($set, '', $escape);}if (strlen($table) === 0){if ( ! isset($this->qb_from[0])){return ($this->db_debug) ? $this->display_error('db_must_set_table') : FALSE;}$table = $this->qb_from[0];}// Batch this baby$affected_rows = 0;for ($i = 0, $total = count($this->qb_set); $i < $total; $i += $batch_size){if ($this->query($this->_insert_batch($this->protect_identifiers($table, TRUE, $escape, FALSE), $this->qb_keys, array_slice($this->qb_set, $i, $batch_size)))){$affected_rows += $this->affected_rows();}}$this->_reset_write();return $affected_rows;}// --------------------------------------------------------------------/*** Insert batch statement** Generates a platform-specific insert string from the supplied data.** @param string $table Table name* @param array $keys INSERT keys* @param array $values INSERT values* @return string*/protected function _insert_batch($table, $keys, $values){return 'INSERT INTO '.$table.' ('.implode(', ', $keys).') VALUES '.implode(', ', $values);}// --------------------------------------------------------------------/*** The "set_insert_batch" function. Allows key/value pairs to be set for batch inserts** @param mixed* @param string* @param bool* @return CI_DB_query_builder*/public function set_insert_batch($key, $value = '', $escape = NULL){$key = $this->_object_to_array_batch($key);if ( ! is_array($key)){$key = array($key => $value);}is_bool($escape) OR $escape = $this->_protect_identifiers;$keys = array_keys($this->_object_to_array(reset($key)));sort($keys);foreach ($key as $row){$row = $this->_object_to_array($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->qb_set[] = array();return;}ksort($row); // puts $row in the same order as our keysif ($escape !== FALSE){$clean = array();foreach ($row as $value){$clean[] = $this->escape($value);}$row = $clean;}$this->qb_set[] = '('.implode(',', $row).')';}foreach ($keys as $k){$this->qb_keys[] = $this->protect_identifiers($k, FALSE, $escape);}return $this;}// --------------------------------------------------------------------/*** Get INSERT query string** Compiles an insert query and returns the sql** @param string the table to insert into* @param bool TRUE: reset QB values; FALSE: leave QB values alone* @return string*/public function get_compiled_insert($table = '', $reset = TRUE){if ($this->_validate_insert($table) === FALSE){return FALSE;}$sql = $this->_insert($this->protect_identifiers($this->qb_from[0], TRUE, NULL, FALSE),array_keys($this->qb_set),array_values($this->qb_set));if ($reset === TRUE){$this->_reset_write();}return $sql;}// --------------------------------------------------------------------/*** 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* @param bool $escape Whether to escape values and identifiers* @return bool TRUE on success, FALSE on failure*/public function insert($table = '', $set = NULL, $escape = NULL){if ($set !== NULL){$this->set($set, '', $escape);}if ($this->_validate_insert($table) === FALSE){return FALSE;}$sql = $this->_insert($this->protect_identifiers($this->qb_from[0], TRUE, $escape, FALSE),array_keys($this->qb_set),array_values($this->qb_set));$this->_reset_write();return $this->query($sql);}// --------------------------------------------------------------------/*** Validate Insert** This method is used by both insert() and get_compiled_insert() to* validate that the there data is actually being set and that table* has been chosen to be inserted into.** @param string the table to insert data into* @return string*/protected function _validate_insert($table = ''){if (count($this->qb_set) === 0){return ($this->db_debug) ? $this->display_error('db_must_use_set') : FALSE;}if ($table !== ''){$this->qb_from[0] = $table;}elseif ( ! isset($this->qb_from[0])){return ($this->db_debug) ? $this->display_error('db_must_set_table') : FALSE;}return TRUE;}// --------------------------------------------------------------------/*** Replace** Compiles an replace into string and runs the query** @param string the table to replace data into* @param array an associative array of insert values* @return bool TRUE on success, FALSE on failure*/public function replace($table = '', $set = NULL){if ($set !== NULL){$this->set($set);}if (count($this->qb_set) === 0){return ($this->db_debug) ? $this->display_error('db_must_use_set') : FALSE;}if ($table === ''){if ( ! isset($this->qb_from[0])){return ($this->db_debug) ? $this->display_error('db_must_set_table') : FALSE;}$table = $this->qb_from[0];}$sql = $this->_replace($this->protect_identifiers($table, TRUE, NULL, FALSE), array_keys($this->qb_set), array_values($this->qb_set));$this->_reset_write();return $this->query($sql);}// --------------------------------------------------------------------/*** Replace statement** Generates a platform-specific replace string from the supplied data** @param string the table name* @param array the insert keys* @param array the insert values* @return string*/protected function _replace($table, $keys, $values){return 'REPLACE INTO '.$table.' ('.implode(', ', $keys).') VALUES ('.implode(', ', $values).')';}// --------------------------------------------------------------------/*** FROM tables** Groups tables in FROM clauses if needed, so there is no confusion* about operator precedence.** Note: This is only used (and overridden) by MySQL and CUBRID.** @return string*/protected function _from_tables(){return implode(', ', $this->qb_from);}// --------------------------------------------------------------------/*** Get UPDATE query string** Compiles an update query and returns the sql** @param string the table to update* @param bool TRUE: reset QB values; FALSE: leave QB values alone* @return string*/public function get_compiled_update($table = '', $reset = TRUE){// Combine any cached components with the current statements$this->_merge_cache();if ($this->_validate_update($table) === FALSE){return FALSE;}$sql = $this->_update($this->qb_from[0], $this->qb_set);if ($reset === TRUE){$this->_reset_write();}return $sql;}// --------------------------------------------------------------------/*** UPDATE** Compiles an update string and runs the query.** @param string $table* @param array $set An associative array of update values* @param mixed $where* @param int $limit* @return bool TRUE on success, FALSE on failure*/public function update($table = '', $set = NULL, $where = NULL, $limit = NULL){// Combine any cached components with the current statements$this->_merge_cache();if ($set !== NULL){$this->set($set);}if ($this->_validate_update($table) === FALSE){return FALSE;}if ($where !== NULL){$this->where($where);}if ( ! empty($limit)){$this->limit($limit);}$sql = $this->_update($this->qb_from[0], $this->qb_set);$this->_reset_write();return $this->query($sql);}// --------------------------------------------------------------------/*** Validate Update** This method is used by both update() and get_compiled_update() to* validate that data is actually being set and that a table has been* chosen to be update.** @param string the table to update data on* @return bool*/protected function _validate_update($table){if (count($this->qb_set) === 0){return ($this->db_debug) ? $this->display_error('db_must_use_set') : FALSE;}if ($table !== ''){$this->qb_from = array($this->protect_identifiers($table, TRUE, NULL, FALSE));}elseif ( ! isset($this->qb_from[0])){return ($this->db_debug) ? $this->display_error('db_must_set_table') : FALSE;}return TRUE;}// --------------------------------------------------------------------/*** Update_Batch** Compiles an update string and runs the query** @param string the table to retrieve the results from* @param array an associative array of update values* @param string the where key* @return int number of rows affected or FALSE on failure*/public function update_batch($table, $set = NULL, $index = NULL, $batch_size = 100){// Combine any cached components with the current statements$this->_merge_cache();if ($index === NULL){return ($this->db_debug) ? $this->display_error('db_must_use_index') : FALSE;}if ($set === NULL){if (empty($this->qb_set_ub)){return ($this->db_debug) ? $this->display_error('db_must_use_set') : FALSE;}}else{if (empty($set)){return ($this->db_debug) ? $this->display_error('update_batch() called with no data') : FALSE;}$this->set_update_batch($set, $index);}if (strlen($table) === 0){if ( ! isset($this->qb_from[0])){return ($this->db_debug) ? $this->display_error('db_must_set_table') : FALSE;}$table = $this->qb_from[0];}// Batch this baby$affected_rows = 0;for ($i = 0, $total = count($this->qb_set_ub); $i < $total; $i += $batch_size){if ($this->query($this->_update_batch($this->protect_identifiers($table, TRUE, NULL, FALSE), array_slice($this->qb_set_ub, $i, $batch_size), $index))){$affected_rows += $this->affected_rows();}$this->qb_where = array();}$this->_reset_write();return $affected_rows;}// --------------------------------------------------------------------/*** Update_Batch statement** Generates a platform-specific batch update string from the supplied data** @param string $table Table name* @param array $values Update data* @param string $index WHERE key* @return string*/protected function _update_batch($table, $values, $index){$ids = array();foreach ($values as $key => $val){$ids[] = $val[$index]['value'];foreach (array_keys($val) as $field){if ($field !== $index){$final[$val[$field]['field']][] = 'WHEN '.$val[$index]['field'].' = '.$val[$index]['value'].' THEN '.$val[$field]['value'];}}}$cases = '';foreach ($final as $k => $v){$cases .= $k." = CASE \n".implode("\n", $v)."\n".'ELSE '.$k.' END, ';}$this->where($val[$index]['field'].' IN('.implode(',', $ids).')', NULL, FALSE);return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');}// --------------------------------------------------------------------/*** The "set_update_batch" function. Allows key/value pairs to be set for batch updating** @param array* @param string* @param bool* @return CI_DB_query_builder*/public function set_update_batch($key, $index = '', $escape = NULL){$key = $this->_object_to_array_batch($key);if ( ! is_array($key)){// @todo error}is_bool($escape) OR $escape = $this->_protect_identifiers;foreach ($key as $k => $v){$index_set = FALSE;$clean = array();foreach ($v as $k2 => $v2){if ($k2 === $index){$index_set = TRUE;}$clean[$k2] = array('field' => $this->protect_identifiers($k2, FALSE, $escape),'value' => ($escape === FALSE ? $v2 : $this->escape($v2)));}if ($index_set === FALSE){return $this->display_error('db_batch_missing_index');}$this->qb_set_ub[] = $clean;}return $this;}// --------------------------------------------------------------------/*** Empty Table** Compiles a delete string and runs "DELETE FROM table"** @param string the table to empty* @return bool TRUE on success, FALSE on failure*/public function empty_table($table = ''){if ($table === ''){if ( ! isset($this->qb_from[0])){return ($this->db_debug) ? $this->display_error('db_must_set_table') : FALSE;}$table = $this->qb_from[0];}else{$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 bool TRUE on success, FALSE on failure*/public function truncate($table = ''){if ($table === ''){if ( ! isset($this->qb_from[0])){return ($this->db_debug) ? $this->display_error('db_must_set_table') : FALSE;}$table = $this->qb_from[0];}else{$table = $this->protect_identifiers($table, TRUE, NULL, FALSE);}$sql = $this->_truncate($table);$this->_reset_write();return $this->query($sql);}// --------------------------------------------------------------------/*** Truncate statement** Generates a platform-specific truncate string from the supplied data** If the database does not support the truncate() command,* then this method maps to 'DELETE FROM table'** @param string the table name* @return string*/protected function _truncate($table){return 'TRUNCATE '.$table;}// --------------------------------------------------------------------/*** Get DELETE query string** Compiles a delete query string and returns the sql** @param string the table to delete from* @param bool TRUE: reset QB values; FALSE: leave QB values alone* @return string*/public function get_compiled_delete($table = '', $reset = TRUE){$this->return_delete_sql = TRUE;$sql = $this->delete($table, '', NULL, $reset);$this->return_delete_sql = FALSE;return $sql;}// --------------------------------------------------------------------/*** Delete** Compiles a delete string and runs the query** @param mixed the table(s) to delete from. String or array* @param mixed the where clause* @param mixed the limit clause* @param bool* @return mixed*/public function delete($table = '', $where = '', $limit = NULL, $reset_data = TRUE){// Combine any cached components with the current statements$this->_merge_cache();if ($table === ''){if ( ! isset($this->qb_from[0])){return ($this->db_debug) ? $this->display_error('db_must_set_table') : FALSE;}$table = $this->qb_from[0];}elseif (is_array($table)){empty($where) && $reset_data = FALSE;foreach ($table as $single_table){$this->delete($single_table, $where, $limit, $reset_data);}return;}else{$table = $this->protect_identifiers($table, TRUE, NULL, FALSE);}if ($where !== ''){$this->where($where);}if ( ! empty($limit)){$this->limit($limit);}if (count($this->qb_where) === 0){return ($this->db_debug) ? $this->display_error('db_del_must_use_where') : FALSE;}$sql = $this->_delete($table);if ($reset_data){$this->_reset_write();}return ($this->return_delete_sql === TRUE) ? $sql : $this->query($sql);}// --------------------------------------------------------------------/*** Delete statement** Generates a platform-specific delete string from the supplied data** @param string the table name* @return string*/protected function _delete($table){return 'DELETE FROM '.$table.$this->_compile_wh('qb_where').($this->qb_limit ? ' LIMIT '.$this->qb_limit : '');}// --------------------------------------------------------------------/*** DB Prefix** Prepends a database prefix if one exists in configuration** @param string the table* @return string*/public function dbprefix($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($t);}return;}// Does the string contain a comma? If so, we need to separate// the string into discreet statementsif (strpos($table, ',') !== FALSE){return $this->_track_aliases(explode(',', $table));}// if a table alias is used we can recognize it by a spaceif (strpos($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($table, ' '));// Store the alias, if it doesn't already existif ( ! in_array($table, $this->qb_aliased_tables)){$this->qb_aliased_tables[] = $table;}}}// --------------------------------------------------------------------/*** Compile the SELECT statement** Generates a query string based on which functions were used.* Should not be called directly.** @param bool $select_override* @return string*/protected function _compile_select($select_override = FALSE){// Combine any cached components with the current statements$this->_merge_cache();// Write the "select" portion of the queryif ($select_override !== FALSE){$sql = $select_override;}else{$sql = ( ! $this->qb_distinct) ? 'SELECT ' : 'SELECT DISTINCT ';if (count($this->qb_select) === 0){$sql .= '*';}else{// Cycle through the "select" portion of the query and prep each column name.// The reason we protect identifiers here rather than in the select() function// is because until the user calls the from() function we don't know if there are aliasesforeach ($this->qb_select as $key => $val){$no_escape = isset($this->qb_no_escape[$key]) ? $this->qb_no_escape[$key] : NULL;$this->qb_select[$key] = $this->protect_identifiers($val, FALSE, $no_escape);}$sql .= implode(', ', $this->qb_select);}}// Write the "FROM" portion of the queryif (count($this->qb_from) > 0){$sql .= "\nFROM ".$this->_from_tables();}// Write the "JOIN" portion of the queryif (count($this->qb_join) > 0){$sql .= "\n".implode("\n", $this->qb_join);}$sql .= $this->_compile_wh('qb_where').$this->_compile_group_by().$this->_compile_wh('qb_having').$this->_compile_order_by(); // ORDER BY// LIMITif ($this->qb_limit OR $this->qb_offset){return $this->_limit($sql."\n");}return $sql;}// --------------------------------------------------------------------/*** Compile WHERE, HAVING statements** Escapes identifiers in WHERE and HAVING statements at execution time.** Required so that aliases are tracked properly, regardless of whether* where(), or_where(), having(), or_having are called prior to from(),* join() and dbprefix is added only if needed.** @param string $qb_key 'qb_where' or 'qb_having'* @return string SQL statement*/protected function _compile_wh($qb_key){if (count($this->$qb_key) > 0){for ($i = 0, $c = count($this->$qb_key); $i < $c; $i++){// Is this condition already compiled?if (is_string($this->{$qb_key}[$i])){continue;}elseif ($this->{$qb_key}[$i]['escape'] === FALSE){$this->{$qb_key}[$i] = $this->{$qb_key}[$i]['condition'];continue;}// Split multiple conditions$conditions = preg_split('/((?:^|\s+)AND\s+|(?:^|\s+)OR\s+)/i',$this->{$qb_key}[$i]['condition'],-1,PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);for ($ci = 0, $cc = count($conditions); $ci < $cc; $ci++){if (($op = $this->_get_operator($conditions[$ci])) === FALSEOR ! preg_match('/^(\(?)(.*)('.preg_quote($op, '/').')\s*(.*(?<!\)))?(\)?)$/i', $conditions[$ci], $matches)){continue;}// $matches = array(// 0 => '(test <= foo)', /* the whole thing */// 1 => '(', /* optional */// 2 => 'test', /* the field name */// 3 => ' <= ', /* $op */// 4 => 'foo', /* optional, if $op is e.g. 'IS NULL' */// 5 => ')' /* optional */// );if ( ! empty($matches[4])){$this->_is_literal($matches[4]) OR $matches[4] = $this->protect_identifiers(trim($matches[4]));$matches[4] = ' '.$matches[4];}$conditions[$ci] = $matches[1].$this->protect_identifiers(trim($matches[2])).' '.trim($matches[3]).$matches[4].$matches[5];}$this->{$qb_key}[$i] = implode('', $conditions);}return ($qb_key === 'qb_having' ? "\nHAVING " : "\nWHERE ").implode("\n", $this->$qb_key);}return '';}// --------------------------------------------------------------------/*** Compile GROUP BY** Escapes identifiers in GROUP BY statements at execution time.** Required so that aliases are tracked properly, regardless of wether* group_by() is called prior to from(), join() and dbprefix is added* only if needed.** @return string SQL statement*/protected function _compile_group_by(){if (count($this->qb_groupby) > 0){for ($i = 0, $c = count($this->qb_groupby); $i < $c; $i++){// Is it already compiled?if (is_string($this->qb_groupby[$i])){continue;}$this->qb_groupby[$i] = ($this->qb_groupby[$i]['escape'] === FALSE OR $this->_is_literal($this->qb_groupby[$i]['field']))? $this->qb_groupby[$i]['field']: $this->protect_identifiers($this->qb_groupby[$i]['field']);}return "\nGROUP BY ".implode(', ', $this->qb_groupby);}return '';}// --------------------------------------------------------------------/*** Compile ORDER BY** Escapes identifiers in ORDER BY statements at execution time.** Required so that aliases are tracked properly, regardless of wether* order_by() is called prior to from(), join() and dbprefix is added* only if needed.** @return string SQL statement*/protected function _compile_order_by(){if (is_array($this->qb_orderby) && count($this->qb_orderby) > 0){for ($i = 0, $c = count($this->qb_orderby); $i < $c; $i++){if ($this->qb_orderby[$i]['escape'] !== FALSE && ! $this->_is_literal($this->qb_orderby[$i]['field'])){$this->qb_orderby[$i]['field'] = $this->protect_identifiers($this->qb_orderby[$i]['field']);}$this->qb_orderby[$i] = $this->qb_orderby[$i]['field'].$this->qb_orderby[$i]['direction'];}return $this->qb_orderby = "\nORDER BY ".implode(', ', $this->qb_orderby);}elseif (is_string($this->qb_orderby)){return $this->qb_orderby;}return '';}// --------------------------------------------------------------------/*** Object to Array** Takes an object as input and converts the class variables to array key/vals** @param object* @return array*/protected function _object_to_array($object){if ( ! is_object($object)){return $object;}$array = array();foreach (get_object_vars($object) as $key => $val){// There are some built in keys we need to ignore for this conversionif ( ! is_object($val) && ! is_array($val) && $key !== '_parent_name'){$array[$key] = $val;}}return $array;}// --------------------------------------------------------------------/*** Object to Array** Takes an object as input and converts the class variables to array key/vals** @param object* @return array*/protected function _object_to_array_batch($object){if ( ! is_object($object)){return $object;}$array = array();$out = get_object_vars($object);$fields = array_keys($out);foreach ($fields as $val){// There are some built in keys we need to ignore for this conversionif ($val !== '_parent_name'){$i = 0;foreach ($out[$val] as $data){$array[$i++][$val] = $data;}}}return $array;}// --------------------------------------------------------------------/*** Start Cache** Starts QB caching** @return CI_DB_query_builder*/public function start_cache(){$this->qb_caching = TRUE;return $this;}// --------------------------------------------------------------------/*** Stop Cache** Stops QB caching** @return CI_DB_query_builder*/public function stop_cache(){$this->qb_caching = FALSE;return $this;}// --------------------------------------------------------------------/*** Flush Cache** Empties the QB cache** @return CI_DB_query_builder*/public function flush_cache(){$this->_reset_run(array('qb_cache_select' => array(),'qb_cache_from' => array(),'qb_cache_join' => array(),'qb_cache_where' => array(),'qb_cache_groupby' => array(),'qb_cache_having' => array(),'qb_cache_orderby' => array(),'qb_cache_set' => array(),'qb_cache_exists' => array(),'qb_cache_no_escape' => array()));return $this;}// --------------------------------------------------------------------/*** Merge Cache** When called, this function merges any cached QB arrays with* locally called ones.** @return void*/protected function _merge_cache(){if (count($this->qb_cache_exists) === 0){return;}elseif (in_array('select', $this->qb_cache_exists, TRUE)){$qb_no_escape = $this->qb_cache_no_escape;}foreach (array_unique($this->qb_cache_exists) as $val) // select, from, etc.{$qb_variable = 'qb_'.$val;$qb_cache_var = 'qb_cache_'.$val;$qb_new = $this->$qb_cache_var;for ($i = 0, $c = count($this->$qb_variable); $i < $c; $i++){if ( ! in_array($this->{$qb_variable}[$i], $qb_new, TRUE)){$qb_new[] = $this->{$qb_variable}[$i];if ($val === 'select'){$qb_no_escape[] = $this->qb_no_escape[$i];}}}$this->$qb_variable = $qb_new;if ($val === 'select'){$this->qb_no_escape = $qb_no_escape;}}// If we are "protecting identifiers" we need to examine the "from"// portion of the query to determine if there are any aliasesif ($this->_protect_identifiers === TRUE && count($this->qb_cache_from) > 0){$this->_track_aliases($this->qb_from);}}// --------------------------------------------------------------------/*** Is literal** Determines if a string represents a literal value or a field name** @param string $str* @return bool*/protected function _is_literal($str){$str = trim($str);if (empty($str) OR ctype_digit($str) OR (string) (float) $str === $str OR in_array(strtoupper($str), array('TRUE', 'FALSE'), TRUE)){return TRUE;}static $_str;if (empty($_str)){$_str = ($this->_escape_char !== '"')? array('"', "'") : array("'");}return in_array($str[0], $_str, TRUE);}// --------------------------------------------------------------------/*** Reset Query Builder values.** Publicly-visible method to reset the QB values.** @return CI_DB_query_builder*/public function reset_query(){$this->_reset_select();$this->_reset_write();return $this;}// --------------------------------------------------------------------/*** Resets the query builder values. Called by the get() function** @param array An array of fields to reset* @return void*/protected function _reset_run($qb_reset_items){foreach ($qb_reset_items as $item => $default_value){$this->$item = $default_value;}}// --------------------------------------------------------------------/*** Resets the query builder values. Called by the get() function** @return void*/protected function _reset_select(){$this->_reset_run(array('qb_select' => array(),'qb_from' => array(),'qb_join' => array(),'qb_where' => array(),'qb_groupby' => array(),'qb_having' => array(),'qb_orderby' => array(),'qb_aliased_tables' => array(),'qb_no_escape' => array(),'qb_distinct' => FALSE,'qb_limit' => FALSE,'qb_offset' => FALSE));}// --------------------------------------------------------------------/*** Resets the query builder "write" values.** Called by the insert() update() insert_batch() update_batch() and delete() functions** @return void*/protected function _reset_write(){$this->_reset_run(array('qb_set' => array(),'qb_set_ub' => array(),'qb_from' => array(),'qb_join' => array(),'qb_where' => array(),'qb_orderby' => array(),'qb_keys' => array(),'qb_limit' => FALSE));}}