| 1 | <?php |
| 2 | /*************************************************************************** |
| 3 | * Copyright (C) 2003-2010 Polytechnique.org * |
| 4 | * http://opensource.polytechnique.org/ * |
| 5 | * * |
| 6 | * This program is free software; you can redistribute it and/or modify * |
| 7 | * it under the terms of the GNU General Public License as published by * |
| 8 | * the Free Software Foundation; either version 2 of the License, or * |
| 9 | * (at your option) any later version. * |
| 10 | * * |
| 11 | * This program is distributed in the hope that it will be useful, * |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
| 14 | * GNU General Public License for more details. * |
| 15 | * * |
| 16 | * You should have received a copy of the GNU General Public License * |
| 17 | * along with this program; if not, write to the Free Software * |
| 18 | * Foundation, Inc., * |
| 19 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * |
| 20 | ***************************************************************************/ |
| 21 | |
| 22 | // {{{ class PlSqlJoin |
| 23 | class PlSqlJoin |
| 24 | { |
| 25 | private $mode; |
| 26 | private $table; |
| 27 | private $condition; |
| 28 | |
| 29 | const MODE_LEFT = 'LEFT'; |
| 30 | const MODE_RIGHT = 'RIGHT'; |
| 31 | const MODE_INNER = 'INNER'; |
| 32 | |
| 33 | private function __construct($mode, $params) |
| 34 | { |
| 35 | $table = array_shift($params); |
| 36 | $condition = XDB::prepare($params); |
| 37 | if ($mode != self::MODE_LEFT && $mode != self::MODE_RIGHT && $mode != self::MODE_INNER) { |
| 38 | Platal::page()->kill("Join mode error: unknown mode $mode"); |
| 39 | return; |
| 40 | } |
| 41 | $this->mode = $mode; |
| 42 | $this->table = $table; |
| 43 | $this->condition = $condition; |
| 44 | } |
| 45 | |
| 46 | public function mode() |
| 47 | { |
| 48 | return $this->mode; |
| 49 | } |
| 50 | |
| 51 | public function table() |
| 52 | { |
| 53 | return $this->table; |
| 54 | } |
| 55 | |
| 56 | public function condition() |
| 57 | { |
| 58 | return $this->condition; |
| 59 | } |
| 60 | |
| 61 | /** Replace all "metas" in the condition with their translation. |
| 62 | * $ME always becomes the alias of the table |
| 63 | * @param $key The name the joined table will have in the final query |
| 64 | * @param $joinMetas An array of meta => conversion to apply to the condition |
| 65 | */ |
| 66 | public function replaceJoinMetas($key, $joinMetas = array()) |
| 67 | { |
| 68 | $joinMetas['$ME'] = $key; |
| 69 | return str_replace(array_keys($joinMetas), $joinMetas, $this->condition); |
| 70 | } |
| 71 | |
| 72 | /** Create a join command from an array of PlSqlJoin |
| 73 | * @param $joins The list of 'join' to convert into an SQL query |
| 74 | * @param $joinMetas An array of ('$META' => 'conversion') to apply to the joins. |
| 75 | */ |
| 76 | public static function formatJoins(array $joins, array $joinMetas) |
| 77 | { |
| 78 | $str = ''; |
| 79 | foreach ($joins as $key => $join) { |
| 80 | if (!($join instanceof PlSqlJoin)) { |
| 81 | Platal::page()->kill("Error: not a join: $join"); |
| 82 | } |
| 83 | $mode = $join->mode(); |
| 84 | $table = $join->table(); |
| 85 | $str .= ' ' . $mode . ' JOIN ' . $table . ' AS ' . $key; |
| 86 | if ($join->condition() != null) { |
| 87 | $str .= ' ON (' . $join->replaceJoinMetas($key, $joinMetas) . ')'; |
| 88 | } |
| 89 | $str .= "\n"; |
| 90 | } |
| 91 | return $str; |
| 92 | } |
| 93 | |
| 94 | /** Build a left join |
| 95 | * @param table The name of the table. |
| 96 | * @param condition The condition of the jointure |
| 97 | */ |
| 98 | public static function left() |
| 99 | { |
| 100 | $params = func_get_args(); |
| 101 | return new PlSqlJoin(self::MODE_LEFT, $params); |
| 102 | } |
| 103 | |
| 104 | /** Build a right join |
| 105 | * @param table The name of the table. |
| 106 | * @param condition The condition of the jointure |
| 107 | */ |
| 108 | public static function right() |
| 109 | { |
| 110 | $params = func_get_args(); |
| 111 | return new PlSqlJoin(self::MODE_RIGHT, $params); |
| 112 | } |
| 113 | |
| 114 | /** Build a inner join |
| 115 | * @param table The name of the table. |
| 116 | * @param condition The condition of the jointure |
| 117 | */ |
| 118 | public static function inner() |
| 119 | { |
| 120 | $params = func_get_args(); |
| 121 | return new PlSqlJoin(self::MODE_INNER, $params); |
| 122 | } |
| 123 | } |
| 124 | // }}} |
| 125 | |
| 126 | // vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8: |
| 127 | ?> |