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File: datapager.php

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File: datapager.php
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Description: datapager class - returns mysql result
Class: datapager
classes for 'paging' through database query result
Author: By
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Date: 20 years ago
Size: 5,045 bytes
 

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<?php /************************************ datapager - this class provides a simple method of querying databases and returning specific 'page' sizes of results @ 2002 Sam Yapp www.samscripts.com You are free to use modify and do whatever you like with this script. Usage: the constructor: $datapager->datapager($dbconnection, $query, $pagesize, $querytousetocountrecords); where: $dbconnection is a connection to a mysql database $query is the sql query (*without any limit x, y on the end) $pagesize is the number of records per page $querytousetocountrecords is optional it needs to be used when simply replaceing the fields in your queries SELECT bit with a COUNT(*) returns more than 1 row. (this is how datapager counts the number of records and the number of pages the main function - executes the query and returns a mysql result id or 0 if it fails $datapager->execute($pagesize, $pagenumber); where: $pagesize is the number or records per page $page is the page of results set up another query to execute $datapager->loadquery($query, $pagesize, $querytousetocountrecords); // called internally by creator function get a string containing a link to display the next/previous page $str = $datapager->nextpage($html, $althtml = ""); $str = $datapager->prevpage($html, $althtml = ""); where $html is something like <a href='thispage.php?page=%page%'>Next</a> and $althtml is what to use when this is already the last page - defaults to "" get a string containing links to all possible pages $datapager->pagelinks($linkhtml, $currenthtml = "%page%", $separator = " | "); where $linkhtml is something like <a href='thispage.php?page=%page%'>%page%</a> and $currenthtml is used for the current page, ie "%page%" and $separator is what to separate each pagenumber with the following variables are available once a query has been executed: $datapager->page // the current page $datapager->pagesize // number of records per page $datapager->recordcount // total number of records available $datapager->pagecount // total number of pages of records using this page size ************************************/ class datapager{ var $mainquery; var $countquery; var $results; var $connection; var $pagesize; var $pagecount; var $page; var $recordcount; var $querydone; function datapager($conn = 0, $query = "", $pagesize = 10, $countquery = ""){ $this->connection = $conn; $this->querydone = false; $this->pagesize = $pagesize; $this->loadquery($query, $pagesize, $countquery); } function loadquery($query, $pagesize=0, $countquery=""){ $this->querydone = false; if( $pagesize > 0 )$this->pagesize = $pagesize; $this->results = $this->pagecount = $this->page = $this->recordcount = 0; if( $query == "" || strtoupper(substr($query, 0, 6)) != "SELECT") return false; $this->mainquery = $query; if( $countquery == "" ){ $frompos = strpos( strtoupper($query), "FROM"); $this->countquery = "SELECT COUNT(*) ".substr($query, $frompos); }else{ $this->countquery = $countquery; } if( $this->connection ){ $res = mysql_query($this->countquery, $this->connection)or die(mysql_error()); if( $res && mysql_num_rows($res) != 1 ){ $res = mysql_query($this->mainquery, $this->connection)or die(mysql_error()); $this->recordcount = mysql_num_rows($res); }else{ list($this->recordcount) = mysql_fetch_row($res); } $this->pagecount = ceil($this->recordcount / $this->pagesize); $this->page = 1; $this->querydone = true; mysql_free_result($res); return true; } return false; } function nextpage($html, $althtml = ""){ if( $this->page < $this->pagecount ){ return str_replace("%page%", $this->page+1, $html); }else{ return $althtml; } } function prevpage($html, $althtml = ""){ if( $this->page > 1 ){ return str_replace("%page%", $this->page-1, $html); }else{ return $althtml; } } function pagelinks($linkhtml, $currenthtml = "%page%", $separator = " | "){ $str = ""; for( $i = 1; $i <= $this->pagecount; $i++){ if( $i != $this->page ){ $str .= str_replace("%page%", $i, $linkhtml); }else{ $str .= str_replace("%page%", $i, $currenthtml); } if( $i < $this->pagecount ) $str .= $separator; } return $str; } function execute( $page = 1, $pagesize = 10){ if( $this->querydone == false ) return 0; if( $page < 1 ) $page = 1; if( $pagesize > $this->recordcount ) $pagesize = $this->recordcount; $this->pagesize = $pagesize; $this->page = $page; $this->pagecount = ceil($this->recordcount / $this->pagesize); if( $this->page > $this->pagecount ) $this->page = $this->pagecount; // do query $sql = $this->mainquery." LIMIT ".(($this->page-1) * $this->pagesize).",".$this->pagesize; $this->results = mysql_query($sql); return $this->results; } } ?>