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<?php
/**
 * Recordset pagination with First/Prev/Next/Last links
 *
 * This file is part of ADOdb, a Database Abstraction Layer library for PHP.
 *
 * @package ADOdb
 * @link https://adodb.org Project's web site and documentation
 * @link https://github.com/ADOdb/ADOdb Source code and issue tracker
 *
 * The ADOdb Library is dual-licensed, released under both the BSD 3-Clause
 * and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,
 * any later version. This means you can use it in proprietary products.
 * See the LICENSE.md file distributed with this source code for details.
 * @license BSD-3-Clause
 * @license LGPL-2.1-or-later
 *
 * @copyright 2000-2013 John Lim
 * @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community
 */

class ADODB_Pager {
	var $id; 	// unique id for pager (defaults to 'adodb')
	var $db; 	// ADODB connection object
	var $sql; 	// sql used
	var $rs;	// recordset generated
	var $curr_page;	// current page number before Render() called, calculated in constructor
	var $rows;		// number of rows per page
    var $linksPerPage=10; // number of links per page in navigation bar
    var $showPageLinks;

var $gridAttributes = 'width=100% border=1 bgcolor=white';

// Localize text strings here
	var $first = '<code>|&lt;</code>';
	var $prev = '<code>&lt;&lt;</code>';
	var $next = '<code>>></code>';
	var $last = '<code>>|</code>';
	var $moreLinks = '...';
	var $startLinks = '...';
	var $gridHeader = false;
	var $htmlSpecialChars = true;
	var $page = 'Page';
	var $linkSelectedColor = 'red';
	var $cache = 0;  #secs to cache with CachePageExecute()

//----------------------------------------------
	// constructor
	//
	// $db	adodb connection object
	// $sql	sql statement
	// $id	optional id to identify which pager,
	//		if you have multiple on 1 page.
	//		$id should be only be [a-z0-9]*
	//
	function __construct(&$db,$sql,$id = 'adodb', $showPageLinks = false)
	{
	global $PHP_SELF;

$curr_page = $id.'_curr_page';
		if (!empty($PHP_SELF)) $PHP_SELF = htmlspecialchars($_SERVER['PHP_SELF']); // htmlspecialchars() to prevent XSS attacks

$this->sql = $sql;
		$this->id = $id;
		$this->db = $db;
		$this->showPageLinks = $showPageLinks;

$next_page = $id.'_next_page';

if (isset($_GET[$next_page])) {
			$_SESSION[$curr_page] = (integer) $_GET[$next_page];
		}
		if (empty($_SESSION[$curr_page])) $_SESSION[$curr_page] = 1; ## at first page

$this->curr_page = $_SESSION[$curr_page];

}

//---------------------------
	// Display link to first page
	function Render_First($anchor=true)
	{
	global $PHP_SELF;
		if ($anchor) {
	?>
		<a href="<?php echo $PHP_SELF,'?',$this->id;?>_next_page=1"><?php echo $this->first;?></a> &nbsp;
	<?php
		} else {
			print "$this->first &nbsp; ";
		}
	}

//--------------------------
	// Display link to next page
	function render_next($anchor=true)
	{
	global $PHP_SELF;

if ($anchor) {
		?>
		<a href="<?php echo $PHP_SELF,'?',$this->id,'_next_page=',$this->rs->AbsolutePage() + 1 ?>"><?php echo $this->next;?></a> &nbsp;
		<?php
		} else {
			print "$this->next &nbsp; ";
		}
	}

//------------------
	// Link to last page
	//
	// for better performance with large recordsets, you can set
	// $this->db->pageExecuteCountRows = false, which disables
	// last page counting.
	function render_last($anchor=true)
	{
	global $PHP_SELF;

if (!$this->db->pageExecuteCountRows) return;

if ($anchor) {
		?>
			<a href="<?php echo $PHP_SELF,'?',$this->id,'_next_page=',$this->rs->LastPageNo() ?>"><?php echo $this->last;?></a> &nbsp;
		<?php
		} else {
			print "$this->last &nbsp; ";
		}
	}

//---------------------------------------------------
	// original code by "Pablo Costa" <pablo@cbsp.com.br>
        function render_pagelinks()
        {
        global $PHP_SELF;
            $pages        = $this->rs->LastPageNo();
            $linksperpage = $this->linksPerPage ? $this->linksPerPage : $pages;
            for($i=1; $i <= $pages; $i+=$linksperpage)
            {
                if($this->rs->AbsolutePage() >= $i)
                {
                    $start = $i;
                }
            }
			$numbers = '';
            $end = $start+$linksperpage-1;
			$link = $this->id . "_next_page";
            if($end > $pages) $end = $pages;

if ($this->startLinks && $start > 1) {
				$pos = $start - 1;
				$numbers .= "<a href=$PHP_SELF?$link=$pos>$this->startLinks</a>  ";
            }

for($i=$start; $i <= $end; $i++) {
                if ($this->rs->AbsolutePage() == $i)
                    $numbers .= "<font color=$this->linkSelectedColor><b>$i</b></font>  ";
                else
                     $numbers .= "<a href=$PHP_SELF?$link=$i>$i</a>  ";

}
			if ($this->moreLinks && $end < $pages)
				$numbers .= "<a href=$PHP_SELF?$link=$i>$this->moreLinks</a>  ";
            print $numbers . ' &nbsp; ';
        }
	// Link to previous page
	function render_prev($anchor=true)
	{
	global $PHP_SELF;
		if ($anchor) {
	?>
		<a href="<?php echo $PHP_SELF,'?',$this->id,'_next_page=',$this->rs->AbsolutePage() - 1 ?>"><?php echo $this->prev;?></a> &nbsp;
	<?php
		} else {
			print "$this->prev &nbsp; ";
		}
	}

//--------------------------------------------------------
	// Simply rendering of grid. You should override this for
	// better control over the format of the grid
	//
	// We use output buffering to keep code clean and readable.
	function RenderGrid()
	{
	global $gSQLBlockRows; // used by rs2html to indicate how many rows to display
		include_once(ADODB_DIR.'/tohtml.inc.php');
		ob_start();
		$gSQLBlockRows = $this->rows;
		rs2html($this->rs,$this->gridAttributes,$this->gridHeader,$this->htmlSpecialChars);
		$s = ob_get_contents();
		ob_end_clean();
		return $s;
	}

//-------------------------------------------------------
	// Navigation bar
	//
	// we use output buffering to keep the code easy to read.
	function RenderNav()
	{
		ob_start();
		if (!$this->rs->AtFirstPage()) {
			$this->Render_First();
			$this->Render_Prev();
		} else {
			$this->Render_First(false);
			$this->Render_Prev(false);
		}
        if ($this->showPageLinks){
            $this->Render_PageLinks();
        }
		if (!$this->rs->AtLastPage()) {
			$this->Render_Next();
			$this->Render_Last();
		} else {
			$this->Render_Next(false);
			$this->Render_Last(false);
		}
		$s = ob_get_contents();
		ob_end_clean();
		return $s;
	}

//-------------------
	// This is the footer
	function RenderPageCount()
	{
		if (!$this->db->pageExecuteCountRows) return '';
		$lastPage = $this->rs->LastPageNo();
		if ($lastPage == -1) $lastPage = 1; // check for empty rs.
		if ($this->curr_page > $lastPage) $this->curr_page = 1;
		return "<font size=-1>$this->page ".$this->curr_page."/".$lastPage."</font>";
	}

//-----------------------------------
	// Call this class to draw everything.
	function Render($rows=10)
	{
	global $ADODB_COUNTRECS;

$this->rows = $rows;

if ($this->db->dataProvider == 'informix') $this->db->cursorType = IFX_SCROLL;

$savec = $ADODB_COUNTRECS;
		if ($this->db->pageExecuteCountRows) $ADODB_COUNTRECS = true;
		if ($this->cache)
			$rs = $this->db->CachePageExecute($this->cache,$this->sql,$rows,$this->curr_page);
		else
			$rs = $this->db->PageExecute($this->sql,$rows,$this->curr_page);
		$ADODB_COUNTRECS = $savec;

$this->rs = $rs;
		if (!$rs) {
			print "<h3>Query failed: $this->sql</h3>";
			return;
		}

if (!$rs->EOF && (!$rs->AtFirstPage() || !$rs->AtLastPage()))
			$header = $this->RenderNav();
		else
			$header = "&nbsp;";

$grid = $this->RenderGrid();
		$footer = $this->RenderPageCount();

$this->RenderLayout($header,$grid,$footer);

$rs->Close();
		$this->rs = false;
	}

//------------------------------------------------------
	// override this to control overall layout and formatting
	function RenderLayout($header,$grid,$footer,$attributes='border=1 bgcolor=beige')
	{
		echo "<table ".$attributes."><tr><td>",
				$header,
			"</td></tr><tr><td>",
				$grid,
			"</td></tr><tr><td>",
				$footer,
			"</td></tr></table>";
	}
}

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