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Iterator.php
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1 <?php
2 // +----------------------------------------------------------------------+
3 // | PHP version 5 |
4 // +----------------------------------------------------------------------+
5 // | Copyright (c) 1998-2006 Manuel Lemos, Tomas V.V.Cox, |
6 // | Stig. S. Bakken, Lukas Smith |
7 // | All rights reserved. |
8 // +----------------------------------------------------------------------+
9 // | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB |
10 // | API as well as database abstraction for PHP applications. |
11 // | This LICENSE is in the BSD license style. |
12 // | |
13 // | Redistribution and use in source and binary forms, with or without |
14 // | modification, are permitted provided that the following conditions |
15 // | are met: |
16 // | |
17 // | Redistributions of source code must retain the above copyright |
18 // | notice, this list of conditions and the following disclaimer. |
19 // | |
20 // | Redistributions in binary form must reproduce the above copyright |
21 // | notice, this list of conditions and the following disclaimer in the |
22 // | documentation and/or other materials provided with the distribution. |
23 // | |
24 // | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, |
25 // | Lukas Smith nor the names of his contributors may be used to endorse |
26 // | or promote products derived from this software without specific prior|
27 // | written permission. |
28 // | |
29 // | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
30 // | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
31 // | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
32 // | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
33 // | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
34 // | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
35 // | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
36 // | OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
37 // | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
38 // | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
39 // | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
40 // | POSSIBILITY OF SUCH DAMAGE. |
41 // +----------------------------------------------------------------------+
42 // | Author: Lukas Smith <smith@pooteeweet.org> |
43 // +----------------------------------------------------------------------+
44 //
45 // $Id: Iterator.php,v 1.22 2006/05/06 14:03:41 lsmith Exp $
46 
54 class MDB2_Iterator implements Iterator
55 {
56  protected $fetchmode;
57  protected $result;
58  protected $row;
59 
60  // {{{ constructor
61 
66  {
67  $this->result = $result;
68  $this->fetchmode = $fetchmode;
69  }
70  // }}}
71 
72  // {{{ seek()
73 
82  public function seek($rownum)
83  {
84  $this->row = null;
85  if ($this->result) {
86  $this->result->seek($rownum);
87  }
88  }
89  // }}}
90 
91  // {{{ next()
92 
99  public function next()
100  {
101  $this->row = null;
102  }
103  // }}}
104 
105  // {{{ current()
106 
113  public function current()
114  {
115  if (is_null($this->row)) {
116  $row = $this->result->fetchRow($this->fetchmode);
117  if (PEAR::isError($row)) {
118  $row = false;
119  }
120  $this->row = $row;
121  }
122  return $this->row;
123  }
124  // }}}
125 
126  // {{{ valid()
127 
134  public function valid()
135  {
136  return (bool)$this->current();
137  }
138  // }}}
139 
140  // {{{ free()
141 
148  public function free()
149  {
150  if ($this->result) {
151  return $this->result->free();
152  }
153  $this->result = false;
154  $this->row = null;
155  return false;
156  }
157  // }}}
158 
159  // {{{ key()
160 
167  public function key()
168  {
169  if ($this->result) {
170  return $this->result->rowCount();
171  }
172  return false;
173  }
174  // }}}
175 
176  // {{{ rewind()
177 
184  public function rewind()
185  {
186  }
187  // }}}
188 
189  // {{{ destructor
190 
194  public function __destruct()
195  {
196  $this->free();
197  }
198  // }}}
199 }
200 
209 {
210  // {{{ valid()
211 
218  public function valid()
219  {
220  if ($this->result) {
221  return $this->result->valid();
222  }
223  return false;
224  }
225  // }}}
226 
227  // {{{count()
228 
235  public function count()
236  {
237  if ($this->result) {
238  return $this->result->numRows();
239  }
240  return false;
241  }
242  // }}}
243 
244  // {{{ rewind()
245 
252  public function rewind()
253  {
254  $this->seek(0);
255  }
256  // }}}
257 }
258 
259 ?>