php mysql实现内容分页类 - php基础

php用mysql实现分页的原理

PHP控制MYSQL分页显示的类

*数据库分页显示的类

class Page_class {

var $TotalPages, $CurrentPage, $NumPerPage, $QueryStr, $Result, $DBID,$Data;

var $TotalRecords, $StartRecord, $EndRecord, $RowCount ;

function Setup ($NumPerPage) {

$this->NumPerPage = $NumPerPage;

}

function InitPage ($QueryStr,$ID) {

$this->QueryStr = $QueryStr;

$this->DBID = $ID;

$Query = "select COUNT(*) ".strstr($QueryStr,"from");

$this->Result = @mysql_query($Query,$this->DBID) or die("内部错误，请联系管理员");

$this->Data = @mysql_fetch_array($this->Result);

$this->TotalRecords = $this->Data[0];

if ($this->NumPerPage > $this->TotalRecords) {

$this->TotalPages = 1 ;

}

else $this->TotalPages = Ceil($this->TotalRecords/$this->NumPerPage) ;

}

function GetPage ($CurrentPage) {

if ($CurrentPage > $this->TotalPages || $CurrentPage < 1) {

return("错误，没有此页");

}

else {

$this->CurrentPage = $CurrentPage ;

$this->StartRecord = ($this->CurrentPage - 1)*$this->NumPerPage;

$this->EndRecord = $this->CurrentPage * $this->NumPerPage;

$Query = $this->QueryStr." LIMIT ".$this->StartRecord.",".$this->NumPerPage;

$this->Result = @mysql_query($Query,$this->DBID) or die("查询语句出错，请检查语法");

$this->RowCount = @mysql_num_rows($this->Result);

$this->StartRecord += 1;

return($Query);

}

function GetData ($Row) {

@mysql_data_seek($this->Result,$Row) or die("没有这一行数据");

$this->Data = @mysql_fetch_array($this->Result) or die("没有这一行数据");

}