分页类

require_once"DB.php";
class listPage
{
var $_table; //表名
var $_maxLine; //每页显示行数
var $_db;
var $_offset; //记录偏移量

var $total = 0; //记录总数
var $number; //本页读取的记录数
var $result; //读出的结果

var $totalPgs; //总页数
var $currentPgs; //当前页数
var $condition; //显示条件 如：where id='$id' order by id desc
var $pageQuery; //分页显示要传递的参数

var $pageLink1;//分页显示链接
var $pageLink2;//分页显示链接

//******构造函数*************
//参数：表名、最大行数、偏移量、db对象
//分页参考字段请用一个自动编号字段
function ListPage($tableName,$PgNum,$off=0,$db){
$this->_table=$tableName;
$this->_maxLine=$PgNum;
$this->_offset=$off;
$this->_db=$db;
$this->condition=" ";
$this->_db->setFetchMode(DB_FETCHMODE_ASSOC);
}

//********设置显示条件*********
//如：where id='$id' order by id desc
//要求是字串string，符合SQL语法（本字串将加在SQL语句后）
function setCondition($s){
$this->condition = $s;
return true;
}

//******设置传递参数************
// key参数名 value参数值
// 如：setpagequery("id",$id);如有多个参数要传递，可多次调用本函数。
function setPageQuery($key,$value){
$tmp['k']=$key; $tmp['value']=$value;
$this->pageQuery[]= $tmp;
//printr($this->pageQuery);
}

//********读取记录***************
//　主要工作函数，根据所给的条件从表中读取相应的记录
//　返回值是一个二维数组，Result[记录号][字段名]
function readList() {
$SQL = "select * from ".$this->_table." ".$this->condition;
$result = $this->_db->query($SQL);

$this->total = $result->numRows();//计算总记录数

if($this->total>0)
{
//根据条件 Condition //起始
$SQL="SELECT * FROM ".$this->_table." ".$this->condition;
//if(($this->_offset * $this->_maxLine) > $this->total ) $this->_offset = 0;
$result = $this->_db->limitQuery($SQL,$this->_offset,$this->_maxLine);

$k=0;
$rows = array();
while($rows = $result->fetchRow()){
$this->result[] = $rows;
$k++;
}
$this->number=$k;
}
return $this->result;
}

//**********显示页数*************
//显示当前页及总页数
function setPgs() {
$this->totalPgs = ceil($this->total / $this->_maxLine);
$this->currentPgs = ceil($this->_offset / $this->_maxLine)+1;
}

//**********显示翻页按钮*************
//此函数要在ThePage()函数之后调用！！！
//显示首页、下页、上页、未页，并加上要传递的参数
function setPage() {
$this->setPgs();
$first=1;
$next=$this->currentPgs+1;
$prev=$this->currentPgs-1;
$last=$this->totalPgs;

$k=count($this->pageQuery);
$strQuery=""; //生成一个要传递参数字串
for($i=0;$i < $k;$i++){
$strQuery.="&".$this->pageQuery[$i]['k']."=".$this->pageQuery[$i]['value'];
}

$this->pageLink1 = "";
if($this->currentPgs>1 && $this->currentPgs < $this->totalPgs){
$this->pageLink1 .="| <a href=".$_SERVER['PHP_SELF']."?currentpage=".$first.$strQuery.">首页</A> ";
$this->pageLink1 .= "<a href=".$_SERVER['PHP_SELF']."?currentpage=".$prev.$strQuery.">上一页 </a> ";
$this->pageLink1 .= "| <A href=".$_SERVER['PHP_SELF']."?currentpage=".$next.$strQuery.">下一页</A> ";
$this->pageLink1 .= "<A href=".$_SERVER['PHP_SELF']."?currentpage=".$last.$strQuery.">末页</A> |";
}
else if($this->currentPgs==1 && $this->currentPgs < $this->totalPgs) {
$this->pageLink1 .="| 首页 上一页 | ";
$this->pageLink1 .="<A href=".$_SERVER['PHP_SELF']."?currentpage=".$next.$strQuery.">下一页</A> ";
$this->pageLink1 .="<A href=".$_SERVER['PHP_SELF']."?currentpage=".$last.$strQuery.">末页</A> |";
}
else if($this->currentPgs==$this->totalPgs && $this->totalPgs>1) {
$this->pageLink1 .="| <A href=".$_SERVER['PHP_SELF']."?currentpage=".$first.$strQuery.">首页</A> ";
$this->pageLink1 .="<a href=".$_SERVER['PHP_SELF']."?currentpage=".$prev.$strQuery.">上一页 </a> ";
$this->pageLink1 .="| 下一页 末页 |";
}

for($i=1;$i<=$this->totalPgs;$i++)
{
$this->pageLink2 .= "<a href=".$_SERVER['PHP_SELF']."?currentpage=".$i.$strQuery.">".$i."</a> ";
}

}

}
//******end class --------------