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2383 lines (2030 loc) · 52.6 KB
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* 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 - 2012, 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
*/
/**
* 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 {
protected $return_delete_sql = FALSE;
protected $reset_delete_data = FALSE;
protected $qb_select = array();
protected $qb_distinct = FALSE;
protected $qb_from = array();
protected $qb_join = array();
protected $qb_where = array();
protected $qb_like = array();
protected $qb_groupby = array();
protected $qb_having = array();
protected $qb_keys = array();
protected $qb_limit = FALSE;
protected $qb_offset = FALSE;
protected $qb_orderby = array();
protected $qb_set = array();
protected $qb_wherein = array();
protected $qb_aliased_tables = array();
protected $qb_store_array = array();
protected $qb_where_group_started = FALSE;
protected $qb_where_group_count = 0;
// Query Builder Caching variables
protected $qb_caching = FALSE;
protected $qb_cache_exists = array();
protected $qb_cache_select = array();
protected $qb_cache_from = array();
protected $qb_cache_join = array();
protected $qb_cache_where = array();
protected $qb_cache_like = array();
protected $qb_cache_groupby = array();
protected $qb_cache_having = array();
protected $qb_cache_orderby = array();
protected $qb_cache_set = array();
protected $qb_no_escape = array();
protected $qb_cache_no_escape = array();
/**
* Select
*
* Generates the SELECT portion of the query
*
* @param string
* @param mixed
* @return object
*/
public function select($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 $this;
}
// --------------------------------------------------------------------
/**
* Select Max
*
* Generates a SELECT MAX(field) portion of a query
*
* @param string the field
* @param string an alias
* @return object
*/
public function select_max($select = '', $alias = '')
{
return $this->_max_min_avg_sum($select, $alias, 'MAX');
}
// --------------------------------------------------------------------
/**
* Select Min
*
* Generates a SELECT MIN(field) portion of a query
*
* @param string the field
* @param string an alias
* @return object
*/
public function select_min($select = '', $alias = '')
{
return $this->_max_min_avg_sum($select, $alias, 'MIN');
}
// --------------------------------------------------------------------
/**
* Select Average
*
* Generates a SELECT AVG(field) portion of a query
*
* @param string the field
* @param string an alias
* @return object
*/
public function select_avg($select = '', $alias = '')
{
return $this->_max_min_avg_sum($select, $alias, 'AVG');
}
// --------------------------------------------------------------------
/**
* Select Sum
*
* Generates a SELECT SUM(field) portion of a query
*
* @param string the field
* @param string an alias
* @return object
*/
public function select_sum($select = '', $alias = '')
{
return $this->_max_min_avg_sum($select, $alias, 'SUM');
}
// --------------------------------------------------------------------
/**
* Processing Function for the four functions above:
*
* select_max()
* select_min()
* select_avg()
* select_sum()
*
* @param string the field
* @param string an alias
* @return object
*/
protected function _max_min_avg_sum($select = '', $alias = '', $type = 'MAX')
{
if ( ! is_string($select) OR $select === '')
{
$this->display_error('db_invalid_query');
}
$type = strtoupper($type);
if ( ! in_array($type, array('MAX', 'MIN', 'AVG', 'SUM')))
{
show_error('Invalid function type: '.$type);
}
if ($alias === '')
{
$alias = $this->_create_alias_from_table(trim($select));
}
$sql = $this->protect_identifiers($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 $this;
}
// --------------------------------------------------------------------
/**
* Determines the alias name based on the table
*
* @param string
* @return string
*/
protected function _create_alias_from_table($item)
{
if (strpos($item, '.') !== FALSE)
{
$item = explode('.', $item);
return end($item);
}
return $item;
}
// --------------------------------------------------------------------
/**
* DISTINCT
*
* Sets a flag which tells the query string compiler to add DISTINCT
*
* @param bool
* @return object
*/
public function distinct($val = TRUE)
{
$this->qb_distinct = is_bool($val) ? $val : TRUE;
return $this;
}
// --------------------------------------------------------------------
/**
* From
*
* Generates the FROM portion of the query
*
* @param mixed can be a string or array
* @return object
*/
public function from($from)
{
foreach ((array) $from as $val)
{
if (strpos($val, ',') !== FALSE)
{
foreach (explode(',', $val) as $v)
{
$v = trim($v);
$this->_track_aliases($v);
$this->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 $this;
}
// --------------------------------------------------------------------
/**
* Join
*
* Generates the JOIN portion of the query
*
* @param string
* @param string the join condition
* @param string the type of join
* @param string wether not to try to escape identifiers
* @return object
*/
public function join($table, $cond, $type = '', $escape = TRUE)
{
if ($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);
// Split multiple conditions
if ($escape === TRUE && preg_match_all('/\sAND\s|\sOR\s/i', $cond, $m, PREG_SET_ORDER | 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]);
$newcond .= preg_match('/([\[\w\.-]+)([\W\s]+)(.+)/i', $temp, $match)
? $this->protect_identifiers($match[1]).$match[2].$this->protect_identifiers($match[3])
: $temp;
$newcond .= $m[0][$i][0];
}
$cond = $newcond;
}
// Split apart the condition and protect the identifiers
elseif ($escape === TRUE && preg_match('/([\[\w\.-]+)([\W\s]+)(.+)/i', $cond, $match))
{
$cond = $this->protect_identifiers($match[1]).$match[2].$this->protect_identifiers($match[3]);
}
// Do we want to escape the table name?
if ($escape === TRUE)
{
$table = $this->protect_identifiers($table, TRUE, NULL, FALSE);
}
// Assemble the JOIN statement
$this->qb_join[] = $join = $type.'JOIN '.$table.' ON '.$cond;
if ($this->qb_caching === TRUE)
{
$this->qb_cache_join[] = $join;
$this->qb_cache_exists[] = 'join';
}
return $this;
}
// --------------------------------------------------------------------
/**
* Where
*
* Generates the WHERE portion of the query. Separates
* multiple calls with AND
*
* @param mixed
* @param mixed
* @param bool
* @return object
*/
public function where($key, $value = NULL, $escape = TRUE)
{
return $this->_where($key, $value, 'AND ', $escape);
}
// --------------------------------------------------------------------
/**
* OR Where
*
* Generates the WHERE portion of the query. Separates
* multiple calls with OR
*
* @param mixed
* @param mixed
* @param bool
* @return object
*/
public function or_where($key, $value = NULL, $escape = TRUE)
{
return $this->_where($key, $value, 'OR ', $escape);
}
// --------------------------------------------------------------------
/**
* Where
*
* Called by where() or or_where()
*
* @param mixed
* @param mixed
* @param string
* @param mixed
* @return object
*/
protected function _where($key, $value = NULL, $type = 'AND ', $escape = NULL)
{
$type = $this->_group_get_type($type);
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_where) === 0 && count($this->qb_cache_where) === 0) ? '' : $type;
$k = $this->_has_operator($k)
? $this->protect_identifiers(substr($k, 0, strpos(rtrim($k), ' ')), FALSE, $escape).strchr(rtrim($k), ' ')
: $this->protect_identifiers($k, FALSE, $escape);
if (is_null($v) && ! $this->_has_operator($k))
{
// value appears not to have been set, assign the test to IS NULL
$k .= ' IS NULL';
}
if ( ! is_null($v))
{
if ($escape === TRUE)
{
$v = ' '.$this->escape($v);
}
if ( ! $this->_has_operator($k))
{
$k .= ' = ';
}
}
$this->qb_where[] = $prefix.$k.$v;
if ($this->qb_caching === TRUE)
{
$this->qb_cache_where[] = $prefix.$k.$v;
$this->qb_cache_exists[] = 'where';
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* Where_in
*
* Generates a WHERE field IN ('item', 'item') SQL query joined with
* AND if appropriate
*
* @param string The field to search
* @param array The values searched on
* @return object
*/
public function where_in($key = NULL, $values = NULL)
{
return $this->_where_in($key, $values);
}
// --------------------------------------------------------------------
/**
* Where_in_or
*
* Generates a WHERE field IN ('item', 'item') SQL query joined with
* OR if appropriate
*
* @param string The field to search
* @param array The values searched on
* @return object
*/
public function or_where_in($key = NULL, $values = NULL)
{
return $this->_where_in($key, $values, FALSE, 'OR ');
}
// --------------------------------------------------------------------
/**
* Where_not_in
*
* Generates a WHERE field NOT IN ('item', 'item') SQL query joined
* with AND if appropriate
*
* @param string The field to search
* @param array The values searched on
* @return object
*/
public function where_not_in($key = NULL, $values = NULL)
{
return $this->_where_in($key, $values, TRUE);
}
// --------------------------------------------------------------------
/**
* Where_not_in_or
*
* Generates a WHERE field NOT IN ('item', 'item') SQL query joined
* with OR if appropriate
*
* @param string The field to search
* @param array The values searched on
* @return object
*/
public function or_where_not_in($key = NULL, $values = NULL)
{
return $this->_where_in($key, $values, TRUE, 'OR ');
}
// --------------------------------------------------------------------
/**
* Where_in
*
* Called by where_in, where_in_or, where_not_in, where_not_in_or
*
* @param string The field to search
* @param array The values searched on
* @param bool If the statement would be IN or NOT IN
* @param string
* @return object
*/
protected function _where_in($key = NULL, $values = NULL, $not = FALSE, $type = 'AND ')
{
if ($key === NULL OR $values === NULL)
{
return $this;
}
$type = $this->_group_get_type($type);
if ( ! is_array($values))
{
$values = array($values);
}
$not = ($not) ? ' NOT' : '';
foreach ($values as $value)
{
$this->qb_wherein[] = $this->escape($value);
}
$prefix = (count($this->qb_where) === 0) ? '' : $type;
$this->qb_where[] = $where_in = $prefix.$this->protect_identifiers($key).$not.' IN ('.implode(', ', $this->qb_wherein).') ';
if ($this->qb_caching === TRUE)
{
$this->qb_cache_where[] = $where_in;
$this->qb_cache_exists[] = 'where';
}
// reset the array for multiple calls
$this->qb_wherein = array();
return $this;
}
// --------------------------------------------------------------------
/**
* Like
*
* Generates a %LIKE% portion of the query. Separates
* multiple calls with AND
*
* @param mixed
* @param mixed
* @return object
*/
public function like($field, $match = '', $side = 'both')
{
return $this->_like($field, $match, 'AND ', $side);
}
// --------------------------------------------------------------------
/**
* Not Like
*
* Generates a NOT LIKE portion of the query. Separates
* multiple calls with AND
*
* @param mixed
* @param mixed
* @return object
*/
public function not_like($field, $match = '', $side = 'both')
{
return $this->_like($field, $match, 'AND ', $side, 'NOT');
}
// --------------------------------------------------------------------
/**
* OR Like
*
* Generates a %LIKE% portion of the query. Separates
* multiple calls with OR
*
* @param mixed
* @param mixed
* @return object
*/
public function or_like($field, $match = '', $side = 'both')
{
return $this->_like($field, $match, 'OR ', $side);
}
// --------------------------------------------------------------------
/**
* OR Not Like
*
* Generates a NOT LIKE portion of the query. Separates
* multiple calls with OR
*
* @param mixed
* @param mixed
* @return object
*/
public function or_not_like($field, $match = '', $side = 'both')
{
return $this->_like($field, $match, 'OR ', $side, 'NOT');
}
// --------------------------------------------------------------------
/**
* Like
*
* Called by like() or orlike()
*
* @param mixed
* @param mixed
* @param string
* @return object
*/
protected function _like($field, $match = '', $type = 'AND ', $side = 'both', $not = '')
{
$type = $this->_group_get_type($type);
if ( ! is_array($field))
{
$field = array($field => $match);
}
foreach ($field as $k => $v)
{
$k = $this->protect_identifiers($k);
$prefix = (count($this->qb_like) === 0) ? '' : $type;
$v = $this->escape_like_str($v);
if ($side === 'none')
{
$like_statement = "{$prefix} $k $not LIKE '{$v}'";
}
elseif ($side === 'before')
{
$like_statement = "{$prefix} $k $not LIKE '%{$v}'";
}
elseif ($side === 'after')
{
$like_statement = "{$prefix} $k $not LIKE '{$v}%'";
}
else
{
$like_statement = "{$prefix} $k $not LIKE '%{$v}%'";
}
// some platforms require an escape sequence definition for LIKE wildcards
if ($this->_like_escape_str !== '')
{
$like_statement = $like_statement.sprintf($this->_like_escape_str, $this->_like_escape_chr);
}
$this->qb_like[] = $like_statement;
if ($this->qb_caching === TRUE)
{
$this->qb_cache_like[] = $like_statement;
$this->qb_cache_exists[] = 'like';
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* Starts a query group.
*
* @param string (Internal use only)
* @param string (Internal use only)
* @return object
*/
public function group_start($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;
$this->qb_where[] = $value = $prefix.$not.str_repeat(' ', ++$this->qb_where_group_count).' (';
if ($this->qb_caching)
{
$this->qb_cache_where[] = $value;
}
return $this;
}
// --------------------------------------------------------------------
/**
* Starts a query group, but ORs the group
*
* @return object
*/
public function or_group_start()
{
return $this->group_start('', 'OR ');
}
// --------------------------------------------------------------------
/**
* Starts a query group, but NOTs the group
*
* @return object
*/
public function not_group_start()
{
return $this->group_start('NOT ', 'AND ');
}
// --------------------------------------------------------------------
/**
* Starts a query group, but OR NOTs the group
*
* @return object
*/
public function or_not_group_start()
{
return $this->group_start('NOT ', 'OR ');
}
// --------------------------------------------------------------------
/**
* Ends a query group
*
* @return object
*/
public function group_end()
{
$this->qb_where_group_started = FALSE;
$this->qb_where[] = $value = str_repeat(' ', $this->qb_where_group_count--) . ')';
if ($this->qb_caching)
{
$this->qb_cache_where[] = $value;
}
return $this;
}
// --------------------------------------------------------------------
/**
* Group_get_type
*
* Called by group_start(), _like(), _where() and _where_in()
*
* @param string
* @return string
*/
protected function _group_get_type($type)
{
if ($this->qb_where_group_started)
{
$type = '';
$this->qb_where_group_started = FALSE;
}
return $type;
}
// --------------------------------------------------------------------
/**
* GROUP BY
*
* @param string
* @return object
*/
public function group_by($by)
{
if (is_string($by))
{
$by = explode(',', $by);
}
foreach ($by as $val)
{
$val = trim($val);
if ($val !== '')
{
$this->qb_groupby[] = $val = $this->protect_identifiers($val);
if ($this->qb_caching === TRUE)
{
$this->qb_cache_groupby[] = $val;
$this->qb_cache_exists[] = 'groupby';
}
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* Sets the HAVING value
*
* Separates multiple calls with AND
*
* @param string
* @param string
* @param bool
* @return object
*/
public function having($key, $value = '', $escape = TRUE)
{
return $this->_having($key, $value, 'AND ', $escape);
}
// --------------------------------------------------------------------
/**
* Sets the OR HAVING value
*
* Separates multiple calls with OR
*
* @param string
* @param string
* @param bool
* @return object
*/
public function or_having($key, $value = '', $escape = TRUE)
{
return $this->_having($key, $value, 'OR ', $escape);
}
// --------------------------------------------------------------------
/**
* Sets the HAVING values
*
* Called by having() or or_having()
*
* @param string
* @param string
* @param string
* @param bool
* @return object
*/
protected function _having($key, $value = '', $type = 'AND ', $escape = TRUE)
{
if ( ! is_array($key))
{
$key = array($key => $value);
}
foreach ($key as $k => $v)
{
$prefix = (count($this->qb_having) === 0) ? '' : $type;
$k = $this->_has_operator($k)
? $this->protect_identifiers(substr($k, 0, strpos(rtrim($k), ' ')), FALSE, $escape).strchr(rtrim($k), ' ')
: $this->protect_identifiers($k, FALSE, $escape);
if ( ! $this->_has_operator($k))
{
$k .= ' = ';
}
if ($v !== '')
{
$v = ' '.$this->escape($v);
}
$this->qb_having[] = $prefix.$k.$v;
if ($this->qb_caching === TRUE)
{
$this->qb_cache_having[] = $prefix.$k.$v;
$this->qb_cache_exists[] = 'having';
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* Sets the ORDER BY value
*
* @param string
* @param string direction: asc or desc
* @param bool enable field name escaping
* @return object
*/
public function order_by($orderby, $direction = '', $escape = TRUE)
{
if (strtolower($direction) === 'random')
{
$orderby = ''; // Random results want or don't need a field name
$direction = $this->_random_keyword;
}
elseif (trim($direction) !== '')
{
$direction = in_array(strtoupper(trim($direction)), array('ASC', 'DESC'), TRUE) ? ' '.$direction : ' ASC';
}
if ((strpos($orderby, ',') !== FALSE) && $escape === TRUE)
{
$temp = array();
foreach (explode(',', $orderby) as $part)
{
$part = trim($part);
if ( ! in_array($part, $this->qb_aliased_tables))
{
$part = preg_match('/^(.+)\s+(ASC|DESC)$/i', $part, $matches)
? $this->protect_identifiers(rtrim($matches[1])).' '.$matches[2]
: $this->protect_identifiers($part);
}
$temp[] = $part;
}
$orderby = implode(', ', $temp);
}
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