用odbc的分页显示_php技巧

<?php

$pagesize = 3;//设置每页显示数目

//计算总记录数
$rs_num = "select count(*) as id from table";
$rs_num = odbc_exec($conn_id,$rs_num);
$rs_num = odbc_result($rs_num,"id");

//计算总页数
$pagecount = $rs_num / $pagesize;
$pagecount1 = intval($pagecount);//将总页数取整
$compare = $pagecount – $pagecount1;
switch ($compare){
case "0":
$pagecount = $pagecount1;//总页数
break;
default :
$pagecount1++;
$pagecount = $pagecount1;//总页数
break;
};
if ($pagecount == 0)$pagecount++;

$fpages = $pages-1;
$bpages = $pages+1;

?>
<table>
<tr>
<td>
共<?php echo $pagecount ?>页  
<?php if($pages != 1)echo "<a href=show.php3?pages=1>";?>首页<?php if($pages != 1)echo "</a>"; ?>  
<?php if($pages != 1)echo "<a href=show.php3?pages=".$fpages.">"; ?>前页<?php if($pages != 1)echo "</a>"; ?>  
<?php if($pages != $pagecount)echo "<a href=show.php3?pages=".$bpages.">"; ?>后页<?php if($pages != $pagecount)echo "</a>"; ?> <?php if($pages != $pagecount)echo "<a href=show.php3?pages=".$pagecount.">"; ?>
尾页<?php if($pages != $pagecount)echo "</a>"; ?>
</td>
</tr></table>
<?php
$firstshow = ($pages-1)*$pagesize+1;//确定每页的第一条记录

//找出第一条记录的记录号
$query_string = "SELECT * FROM table Order By id DESC";
$query_string = odbc_exec($conn_id,$query_string);
odbc_fetch_into($query_string,$firstshow,&$idarea);
$idsql = $idarea[0];

//定位查找
if ($pages == $pagecount) {
$rs = "SELECT * FROM table where id <= ".$idsql." Order By id DESC";
}else{
$rs = "SELECT Top ".$pagesize." * FROM table where id <= ".$idsql." Order By id DESC";
};

$rs = odbc_exec($conn_id,$rs);

//显示记录
while(odbc_fetch_row($rs)){

};
?>

<?php
//关闭连接
odbc_close($conn_id);
?>

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