/modules/database/classes/kohana/database/query/builder/join.php
PHP | 144 lines | 71 code | 23 blank | 50 comment | 6 complexity | 8b1d7326462c6ceaafa0fbda060f6a17 MD5 | raw file
Possible License(s): BSD-3-Clause
- <?php defined('SYSPATH') or die('No direct script access.');
- /**
- * Database query builder for JOIN statements. See [Query Builder](/database/query/builder) for usage and examples.
- *
- * @package Kohana/Database
- * @category Query
- * @author Kohana Team
- * @copyright (c) 2008-2009 Kohana Team
- * @license http://kohanaphp.com/license
- */
- class Kohana_Database_Query_Builder_Join extends Database_Query_Builder {
- // Type of JOIN
- protected $_type;
- // JOIN ...
- protected $_table;
- // ON ...
- protected $_on = array();
- // USING ...
- protected $_using = array();
- /**
- * Creates a new JOIN statement for a table. Optionally, the type of JOIN
- * can be specified as the second parameter.
- *
- * @param mixed column name or array($column, $alias) or object
- * @param string type of JOIN: INNER, RIGHT, LEFT, etc
- * @return void
- */
- public function __construct($table, $type = NULL)
- {
- // Set the table to JOIN on
- $this->_table = $table;
- if ($type !== NULL)
- {
- // Set the JOIN type
- $this->_type = (string) $type;
- }
- }
- /**
- * Adds a new condition for joining.
- *
- * @param mixed column name or array($column, $alias) or object
- * @param string logic operator
- * @param mixed column name or array($column, $alias) or object
- * @return $this
- */
- public function on($c1, $op, $c2)
- {
- if ( ! empty($this->_using))
- {
- throw new Kohana_Exception('JOIN ... ON ... cannot be combined with JOIN ... USING ...');
- }
- $this->_on[] = array($c1, $op, $c2);
- return $this;
- }
- /**
- * Adds a new condition for joining.
- *
- * @param string column name
- * @param ...
- * @return $this
- */
- public function using($columns)
- {
- if ( ! empty($this->_on))
- {
- throw new Kohana_Exception('JOIN ... ON ... cannot be combined with JOIN ... USING ...');
- }
- $columns = func_get_args();
- $this->_using = array_merge($this->_using, $columns);
- return $this;
- }
- /**
- * Compile the SQL partial for a JOIN statement and return it.
- *
- * @param object Database instance
- * @return string
- */
- public function compile(Database $db)
- {
- if ($this->_type)
- {
- $sql = strtoupper($this->_type).' JOIN';
- }
- else
- {
- $sql = 'JOIN';
- }
- // Quote the table name that is being joined
- $sql .= ' '.$db->quote_table($this->_table);
- if ( ! empty($this->_using))
- {
- // Quote and concat the columns
- $sql .= ' USING ('.implode(', ', array_map(array($db, 'quote_column'), $this->_using)).')';
- }
- else
- {
- $conditions = array();
- foreach ($this->_on as $condition)
- {
- // Split the condition
- list($c1, $op, $c2) = $condition;
- if ($op)
- {
- // Make the operator uppercase and spaced
- $op = ' '.strtoupper($op);
- }
- // Quote each of the columns used for the condition
- $conditions[] = $db->quote_column($c1).$op.' '.$db->quote_column($c2);
- }
- // Concat the conditions "... AND ..."
- $sql .= ' ON ('.implode(' AND ', $conditions).')';
- }
- return $sql;
- }
- public function reset()
- {
- $this->_type =
- $this->_table = NULL;
- $this->_on = array();
- }
- } // End Database_Query_Builder_Join