我正在尝试获取我的页面的上一个和下一个节点链接/缩略图,并根据它们的标题或文件 URI 或文件名对结果进行排序......
代码查询数据库并根据节点ID(nid,n.nid)输出上一个和下一个节点链接。我想根据节点标题(title,n.title),文件名(filename,f.filename)甚至文件URI(uri,f.uri)对结果进行排序。
但是,当我更改此行时:
->orderBy('n.nid', $order)
至:
->orderBy('n.title', $order)
它行不通。唯一的区别是,如果您从一个图像库的最后一页移动到另一个,它会稍微改变顺序,但在画廊内部,一切都是一样的。问题是如果您有一个画廊并决定在一段时间后插入新图像。节点 ID 现在与其他节点 ID 完全不同,并且此代码无法识别它。
我也尝试过更改出现的其他部分nid
,但它不起作用。我想这对于更了解 MySQL 和 PHP 的人来说是微不足道的,但我坚持了几个小时,希望能得到任何帮助。
这是整个代码(来自 Vlad Stratulat,最初在这里找到):
模板.php
function dad_prev_next($nid = NULL, $op = 'p', $start = 0) {
if ($op == 'p') {
$sql_op = '>';
$order = 'ASC';
}
elseif ($op == 'n') {
$sql_op = '<';
$order = 'DESC';
}
else {
return NULL;
}
$output = '';
// your node must have an image type field
// let's say it's name is IMAGEFIELD
// select from node table
$query = db_select('node', 'n');
// join node table with image field table
$query->leftJoin('field_data_field_IMAGEFIELD', 'i', 'i.entity_id = n.nid');
// join file managed table where all data about managed files stored
$query->leftJoin('file_managed', 'f', 'f.fid = i.field_IMAGEFIELD_fid');
$query
// select nid and title from node
->fields('n', array('nid', 'title'))
// select uri from file_managed (image path)
->fields('f', array('uri'))
// select image alt and title
->fields('i', array('field_IMAGEFIELD_alt', 'field_IMAGEFIELD_title'))
// where nid "greater than"/"lower than" our current node nid
->condition('n.nid', $nid, $sql_op)
// where node type in array('your content types')
->condition('n.type', array('PHOTOS'), 'IN')
// where node is published
->condition('n.status', 1)
// where requested node has image to display (if you want thumbnail)
->condition('f.uri', '', '!=')
// order by nid
->orderBy('n.nid', $order)
// limit result to 1
->range($start, 1);
// make query
$result = $query->execute()->fetchAll();
foreach ($result as $node) {
// theme your thumbnail image
$variables = array(
// default image style name `thumbnail`
// you can use your own by following
// admin/config/media/image-styles on your site
'style_name' => 'thumbnail',
'path' => $node->uri,
'alt' => $node->field_IMAGEFIELD_alt,
'title' => $node->field_IMAGEFIELD_title
);
$image = theme('image_style', $variables);
$options = array(
'html' => TRUE,
'attributes' => array(
'title' => $node->title
)
);
$output = l($image, "node/{$node->nid}", $options);
}
return $output;
}
节点.tpl.php
<?php print dad_prev_next($node->nid, 'p', 0); ?>
<?php print dad_prev_next($node->nid, 'n', 0); ?>
编辑2:
尝试使用 strcmp 函数:
function dad_prev_next($title = NULL, $op = 'p', $start = 0) {
if ($op == 'p') {
$strcmp = '1';
$order = 'ASC';
}
elseif ($op == 'n') {
$strcmp = '2';
$order = 'DESC';
}
else {
return NULL;
}
$output = '';
// your node must have an image type field
// let's say it's name is IMAGEFIELD
// select from node table
$query = db_select('node', 'n');
// join node table with image field table
$query->leftJoin('field_data_field_IMAGEFIELD', 'i', 'i.entity_id = n.nid');
// join file managed table where all data about managed files stored
$query->leftJoin('file_managed', 'f', 'f.fid = i.field_IMAGEFIELD_fid');
$query
// select nid and title from node
->fields('n', array('nid', 'title'))
// select uri from file_managed (image path)
->fields('f', array('uri'))
// select image alt and title
->fields('i', array('field_IMAGEFIELD_alt', 'field_IMAGEFIELD_title'))
// where node type in array('your content types')
->condition('n.type', array('PHOTOS'), 'IN')
// where node is published
->condition('n.status', 1)
// where requested node has image to display (if you want thumbnail)
->condition('f.uri', '', '!=')
// order by nid
->orderBy('n.title', $order)
// limit result to 1
->range($start, 1);
// make query
$result = $query->execute()->fetchAll();
foreach ($result as $node) {
// theme your thumbnail image
$variables = array(
// default image style name `thumbnail`
// you can use your own by following
// admin/config/media/image-styles on your site
'style_name' => 'thumbnail',
'path' => $node->uri,
'alt' => $node->field_IMAGEFIELD_alt,
'title' => $node->field_IMAGEFIELD_title
);
$image = theme('image_style', $variables);
$options = array(
'html' => TRUE,
'attributes' => array(
'title' => $node->title
)
);
$output = l($image, "node/{$node->nid}", $options);
}
return $output;
}
现在没有错误记录,但总是显示相同的照片 - 按字母顺序排列的第一张照片中的 2 张和最后一张中的 2 张。