1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
<?php
/**
* TSqlMapPagedList class file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2012 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Data.SqlMap
*/
Prado::using('System.Collections.TPagedList');
/**
* TSqlMapPagedList implements a list with paging functionality that retrieves
* data from a SqlMap statement.
*
* The maximum number of records fetched is 3 times the page size. It fetches
* the current, the previous and the next page at a time. This allows the paged
* list to determine if the page is a the begin, the middle or the end of the list.
*
* The paged list does not need to know about the total number of records.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @version $Id$
* @package System.Data.SqlMap
* @since 3.1
*/
class TSqlMapPagedList extends TPagedList
{
private $_statement;
private $_parameter;
private $_prevPageList;
private $_nextPageList;
private $_delegate=null;
/**
* Create a new SqlMap paged list.
* @param IMappedStatement SqlMap statement.
* @param mixed query parameters
* @param int page size
* @param mixed delegate for each data row retrieved.
* @param int number of page to fetch on initialization
*/
public function __construct(IMappedStatement $statement,$parameter, $pageSize, $delegate=null, $page=0)
{
parent::__construct();
parent::setCustomPaging(true);
$this->initialize($statement,$parameter, $pageSize, $page);
$this->_delegate=$delegate;
}
/**
* Initialize the paged list.
* @param IMappedStatement SqlMap statement.
* @param mixed query parameters
* @param int page size.
* @param int number of page.
*/
protected function initialize($statement, $parameter, $pageSize, $page)
{
$this->_statement = $statement;
$this->_parameter = $parameter;
$this->setPageSize($pageSize);
$this->attachEventHandler('OnFetchData', array($this, 'fetchDataFromStatement'));
$this->gotoPage($page);
}
/**
* @throws TSqlMapException custom paging must be enabled.
*/
public function setCustomPaging($value)
{
throw new TSqlMapException('sqlmap_must_enable_custom_paging');
}
/**
* Fetch data by executing the SqlMap statement.
* @param TPageList current object.
* @param TPagedListFetchDataEventParameter fetch parameters
*/
protected function fetchDataFromStatement($sender, $param)
{
$limit = $this->getOffsetAndLimit($param);
$connection = $this->_statement->getManager()->getDbConnection();
$data = $this->_statement->executeQueryForList($connection,
$this->_parameter, null, $limit[0], $limit[1], $this->_delegate);
$this->populateData($param, $data);
}
/**
* Switches to the next page.
* @return integer|boolean the new page index, false if next page is not availabe.
*/
public function nextPage()
{
return $this->getIsNextPageAvailable() ? parent::nextPage() : false;
}
/**
* Switches to the previous page.
* @return integer|boolean the new page index, false if previous page is not availabe.
*/
public function previousPage()
{
return $this->getIsPreviousPageAvailable() ? parent::previousPage() : false;
}
/**
* Populate the list with the fetched data.
* @param TPagedListFetchDataEventParameter fetch parameters
* @param array fetched data.
*/
protected function populateData($param, $data)
{
$total = $data instanceof TList ? $data->getCount() : count($data);
$pageSize = $this->getPageSize();
if($total < 1)
{
$param->setData($data);
$this->_prevPageList = null;
$this->_nextPageList = null;
return;
}
if($param->getNewPageIndex() < 1)
{
$this->_prevPageList = null;
if($total <= $pageSize)
{
$param->setData($data);
$this->_nextPageList = null;
}
else
{
$param->setData(array_slice($data, 0, $pageSize));
$this->_nextPageList = array_slice($data, $pageSize-1,$total);
}
}
else
{
if($total <= $pageSize)
{
$this->_prevPageList = array_slice($data, 0, $total);
$param->setData(array());
$this->_nextPageList = null;
}
else if($total <= $pageSize*2)
{
$this->_prevPageList = array_slice($data, 0, $pageSize);
$param->setData(array_slice($data, $pageSize, $total));
$this->_nextPageList = null;
}
else
{
$this->_prevPageList = array_slice($data, 0, $pageSize);
$param->setData(array_slice($data, $pageSize, $pageSize));
$this->_nextPageList = array_slice($data, $pageSize*2, $total-$pageSize*2);
}
}
}
/**
* Calculate the data fetch offsets and limits.
* @param TPagedListFetchDataEventParameter fetch parameters
* @return array 1st element is the offset, 2nd element is the limit.
*/
protected function getOffsetAndLimit($param)
{
$index = $param->getNewPageIndex();
$pageSize = $this->getPageSize();
return $index < 1 ? array($index, $pageSize*2) : array(($index-1)*$pageSize, $pageSize*3);
}
/**
* @return boolean true if the next page is available, false otherwise.
*/
public function getIsNextPageAvailable()
{
return $this->_nextPageList!==null;
}
/**
* @return boolean true if the previous page is available, false otherwise.
*/
public function getIsPreviousPageAvailable()
{
return $this->_prevPageList!==null;
}
/**
* @return boolean true if is the very last page, false otherwise.
*/
public function getIsLastPage()
{
return ($this->_nextPageList===null) || $this->_nextPageList->getCount() < 1;
}
/**
* @return boolean true if is not first nor last page, false otherwise.
*/
public function getIsMiddlePage()
{
return !($this->getIsFirstPage() || $this->getIsLastPage());
}
}
|
