复制代码 代码如下:
class sqlpage{
function sqlpage($sql,$allcount,$pagesize,$page){
$this->sql= $sql;//查询语名
$this->allcount= intval($allcount);//总记录数
$this->pagesize= intval($pagesize);//页面大小（显示记录数）
$this->page= intval($page);//当前页
$this->getpage();
$this->gettop();
}
function getpage(){ //获取当前页
$this->allpage=ceil( $this->allcount/$this->pagesize);//去当前小数的最大整数
if ($this->page=="" or $this->page>$this->allpage or $this->page<0 or $this->page==0){
$this->page2=1;
}else{
$this->page2=intval($this->page);//将页码转换为数字
}
}
function gettop(){ //获取子查询2的TOP大小
if ($this->page2<$this->allpage){
$this->top2=$this->pagesize;
}else{
$this->top2=$this->allcount-$this->pagesize*($this->allpage-1);
}
}
function getsql()
{
$sql=$this->sql;
$this->top1=$this->pagesize*$this->page2;
$orderby = stristr($sql, 'ORDER BY');
if ($orderby !== false) {
$sort = (stripos($orderby, ' desc') !== false) ? 'desc' : 'asc';
$order = str_ireplace('ORDER BY', '', $orderby);
$order = trim(preg_replace('/bASCb|bDESCb/i', '', $order));
}
$sql = preg_replace('/^SELECTs/i', 'SELECT TOP ' . ($this->top1) . ' ', $sql);
$sql = 'SELECT * FROM (SELECt TOP ' . $this->top2 . ' * FROM (' . $sql . ') AS inner_tbl';
if ($orderby !== false) {
$sql .= ' ORDER BY ' . $order . ' ';
$sql .= (stripos($sort, 'asc') !== false) ? 'DESC' : 'ASC';
}
$sql .= ') AS outer_tbl';
if ($orderby !== false) {
$sql .= ' ORDER BY ' . $order . ' ' . $sort;
}
echo $sql;
return $sql;
}
}
?>
