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2641 lines (2260 loc) · 58 KB
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<?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 - 2013, 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(',', $select);
}
// If the escape value was not set will will base it on the global setting
is_bool($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 = $this->protect_identifiers($type.'('.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 ');
}
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