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tims-todo/system/database/DB_query_builder.php

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2014-08-08 15:41:59 -04:00
<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.2.4 or newer
*
* NOTICE OF LICENSE
*
* Licensed under the Open Software License version 3.0
*
* This source file is subject to the Open Software License (OSL 3.0) that is
* bundled with this package in the files license.txt / license.rst. It is
* also available through the world wide web at this URL:
* http://opensource.org/licenses/OSL-3.0
* If you did not receive a copy of the license and are unable to obtain it
* through the world wide web, please send an email to
* licensing@ellislab.com so we can send you a copy immediately.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 1.0
* @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 http://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 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(',', $select);
}
// If the escape value was not set, we will base it on the global setting
is_bool($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 = $this->_protect_identifiers;
// Split multiple conditions
if ($escape === TRUE && preg_match_all('/\sAND\s|\sOR\s/i', $cond, $m, PREG_OFFSET_CAPTURE))
{
$newcond = '';
$m[0][] = array('', strlen($cond));
for ($i = 0, $c = count($m[0]), $s = 0;
$i < $c;
$s = $m[0][$i][1] + strlen($m[0][$i][0]), $i++)
{
$temp = substr($cond, $s, ($m[0][$i][1] - $s));
$newcond .= preg_match("/([\[\]\w\.'-]+)(\s*[^\"\[`'\w]+\s*)(.+)/i", $temp, $match)
? $this->protect_identifiers($match[1]).$match[2].$this->protect_identifiers($match[3])
: $temp;
$newcond .= $m[0][$i][0];
}
$cond = ' ON '.$newcond;
}
// Split apart the condition and protect the identifiers
elseif ($escape === TRUE && preg_match("/([\[\]\w\.'-]+)(\s*[^\"\[`'\w]+\s*)(.+)/i", $cond, $match))
{
$cond = ' ON '.$this->protect_identifiers($match[1]).$match[2].$this->protect_identifiers($match[3]);
}
elseif ( ! $this->_has_operator($cond))
{
$cond = ' USING ('.($escape ? $this->escape_identifiers($cond) : $cond).')';
}
else
{
$cond = ' ON '.$cond;
}
// 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 => $value);
}
// If the escape value was not set will will base it on the global setting
is_bool($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';
}
$this->{$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' : '';
$where_in = array();
foreach ($values as $value)
{
$where_in[] = $this->escape($value);
}
$prefix = (count($this->qb_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 = $this->_protect_identifiers;
foreach ($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);
$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 !== '')
{
$like_statement .= sprintf($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 $escape
* @return object
*/
public function having($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 $escape
* @return object
*/
public function or_having($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, $offset = FALSE)
{
is_null($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 ? $this->qb_offset.', ' : '').$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 $this;
}
// --------------------------------------------------------------------
/**
* Get SELECT query string
*
* Compiles a SELECT query string and returns the sql.
*
* @param string the table name to select from (optional)
* @param bool TRUE: resets QB values; FALSE: leave QB vaules alone
* @return string
*/
public function get_compiled_select($table = '', $reset = TRUE)
{
if ($table !== '')
{
$this->_track_aliases($table);
$this->from($table);
}
$select = $this->_compile_select();
if ($reset === TRUE)
{
$this->_reset_select();
}
return $select;
}
// --------------------------------------------------------------------
/**
* Get
*
* Compiles the select statement based on the other functions called
* and runs the query
*
* @param string the table
* @param string the limit clause
* @param string the offset clause
* @return object
*/
public function get($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 $result;
}
// --------------------------------------------------------------------
/**
* "Count All Results" query
*
* Generates a platform-specific query string that counts all records
* returned by an Query Builder query.
*
* @param string
* @return int
*/
public function count_all_results($table = '')
{
if ($table !== '')
{
$this->_track_aliases($table);
$this->from($table);
}
$result = ($this->qb_distinct === TRUE)
? $this->query($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')));
$this->_reset_select();
if ($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 $offset
* @return object
*/
public function get_where($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, $escape = NULL)
{
if ($set !== NULL)
{
$this->set_insert_batch($set, '', $escape);
}
if (count($this->qb_set) === 0)
{
// No valid data array. Folds in cases where keys and values did not match up
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];
}
// Batch this baby
$affected_rows = 0;
for ($i = 0, $total = count($this->qb_set); $i < $total; $i += 100)
{
$this->query($this->_insert_batch($this->protect_identifiers($table, TRUE, $escape, FALSE), $this->qb_keys, array_slice($this->qb_set, $i, 100)));
$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(current($key)));
sort($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 $row in the same order as our keys
if ($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 $escape Whether to escape values and identifiers
* @return object
*/
public function insert($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) ? $this->display_error('db_must_set_table') : FALSE;
}
return TRUE;
}
// --------------------------------------------------------------------
/**
* Replace
*
* Compiles an replace into string and runs the query
*
* @param string the table to replace data into
* @param array an associative array of insert values
* @return object
*/
public function replace($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 overriden) 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->protect_identifiers($this->qb_from[0], TRUE, NULL, FALSE), $this->qb_set);
if ($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 $limit
* @return object
*/
public function update($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->protect_identifiers($this->qb_from[0], TRUE, NULL, FALSE), $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[0] = $table;
}
elseif ( ! isset($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)
{
// 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)
{
$this->set_update_batch($set, $index);
}
if (count($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];
}
// Batch this baby
$affected_rows = 0;
for ($i = 0, $total = count($this->qb_set); $i < $total; $i += 100)
{
$this->query($this->_update_batch($this->protect_identifiers($table, TRUE, NULL, FALSE), array_slice($this->qb_set, $i, 100), $this->protect_identifiers($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];
foreach (array_keys($val) as $field)
{
if ($field !== $index)
{
$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
}
}
}
$cases = '';
foreach ($final as $k => $v)
{
$cases .= $k." = CASE \n"
.implode("\n", $v)."\n"
.'ELSE '.$k.' END, ';
}
$this->where($index.' 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;
}
$clean[$this->protect_identifiers($k2, FALSE, $escape)] = ($escape === FALSE) ? $v2 : $this->escape($v2);
}
if ($index_set === FALSE)
{
return $this->display_error('db_batch_missing_index');
}
$this->qb_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->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 object
*/
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))
{
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 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->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
$this->_merge_cache();
// Write the "select" portion of the query
if ($select_override !== FALSE)
{
$sql = $select_override;
}
else
{
$sql = ( ! $this->qb_distinct) ? 'SELECT ' : 'SELECT DISTINCT ';
if (count($this->qb_select) === 0)
{
$sql .= '*';
}
else
{
// Cycle through the "select" portion of the query and prep each column name.
// The reason we protect identifiers here rather then in the select() function
// is because until the user calls the from() function we don't know if there are aliases
foreach ($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(', ', $this->qb_select);
}
}
// Write the "FROM" portion of the query
if (count($this->qb_from) > 0)
{
$sql .= "\nFROM ".$this->_from_tables();
}
// Write the "JOIN" portion of the query
if (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
// LIMIT
if ($this->qb_limit)
{
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 wether
* 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])) === FALSE
OR ! 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 => $val)
{
// There are some built in keys we need to ignore for this conversion
if ( ! is_object($val) && ! is_array($val) && $key !== '_parent_name')
{
$array[$key] = $val;
}
}
return $array;
}
// --------------------------------------------------------------------
/**
* Object to Array
*
* Takes an object as input and converts the class variables to array key/vals
*
* @param object
* @return array
*/
protected function _object_to_array_batch($object)
{
if ( ! is_object($object))
{
return $object;
}
$array = array();
$out = get_object_vars($object);
$fields = array_keys($out);
foreach ($fields as $val)
{
// There are some built in keys we need to ignore for this conversion
if ($val !== '_parent_name')
{
$i = 0;
foreach ($out[$val] as $data)
{
$array[$i++][$val] = $data;
}
}
}
return $array;
}
// --------------------------------------------------------------------
/**
* Start Cache
*
* Starts QB caching
*
* @return void
*/
public function start_cache()
{
$this->qb_caching = TRUE;
}
// --------------------------------------------------------------------
/**
* Stop Cache
*
* Stops QB caching
*
* @return void
*/
public function stop_cache()
{
$this->qb_caching = FALSE;
}
// --------------------------------------------------------------------
/**
* Flush Cache
*
* Empties the QB cache
*
* @return void
*/
public function flush_cache()
{
$this->_reset_run(array(
'qb_cache_select' => array(),
'qb_cache_from' => array(),
'qb_cache_join' => array(),
'qb_cache_where' => array(),
'qb_cache_groupby' => array(),
'qb_cache_having' => array(),
'qb_cache_orderby' => array(),
'qb_cache_set' => array(),
'qb_cache_exists' => array(),
'qb_cache_no_escape' => array()
));
}
// --------------------------------------------------------------------
/**
* Merge Cache
*
* When called, this function merges any cached QB arrays with
* locally called ones.
*
* @return void
*/
protected function _merge_cache()
{
if (count($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 = $qb_no_escape;
}
}
// If we are "protecting identifiers" we need to examine the "from"
// portion of the query to determine if there are any aliases
if ($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 void
*/
public function reset_query()
{
$this->_reset_select();
$this->_reset_write();
}
// --------------------------------------------------------------------
/**
* Resets the query builder values. Called by the get() function
*
* @param array An array of fields to reset
* @return void
*/
protected function _reset_run($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_from' => array(),
'qb_join' => array(),
'qb_where' => array(),
'qb_orderby' => array(),
'qb_keys' => array(),
'qb_limit' => FALSE
)
);
}
}
/* End of file DB_query_builder.php */
/* Location: ./system/database/DB_query_builder.php */
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