我最近一直在修补PHP，想制作自己的博客代码。我知道如何从数据库中进行选择，我将在其中为表项指定一个表。
我只想知道如何根据page GET变量仅选择表格的某些部分。
很抱歉没有任何代码，但这是一个非常广泛的问题，我觉得当前的代码并不是回答这个问题的必要条件。
编辑：我正在使用MySQL。
答案 0 :(得分：1)
使用MySQL，您可以使用LIMIT子句。假设您的页码编号从1开始：
$pageSize = 10;
$page = abs(intval($_GET["page"]));
if ($page < 1) {
$page = 1;
}
$startResult = ($page - 1) * $pageSize;
$sql = "SELECT * FROM `tableName` LIMIT $startResult, $pageSize";
从外部（敌对）环境获取参数时要做的一件非常重要的事情是清理输入。如果您不是恶意用户或Web机器人，可以在GET页面变量中插入任何字符串并更改您的查询。这称为SQL注入。只是google for it，你会找到很多解释。
既然我们知道我们的页面变量必须是正整数，我首先用intval（获取变量的整数值）然后用abs（绝对值）对待它因为我们只想要正值。另一种方法是使用预处理语句（寻找PDO）。
答案 1 :(得分：0)
I will be like below. You have to do changes according to your code style
<?php
/*
Place code to connect to your DB here.
*/
include('config.php'); // include your code to connect to DB.
$tbl_name=""; //your table name
// How many adjacent pages should be shown on each side?
$adjacents = 3;
/*
First get total number of rows in data table.
If you have a WHERE clause in your query, make sure you mirror it here.
*/
$query = "SELECT COUNT(*) as num FROM $tbl_name";
$total_pages = mysql_fetch_array(mysql_query($query));
$total_pages = $total_pages[num];
/* Setup vars for query. */
$targetpage = "filename.php"; //your file name (the name of this file)
$limit = 2; //how many items to show per page
$page = $_GET['page'];
if($page)
$start = ($page - 1) * $limit; //first item to display on this page
else
$start = 0; //if no page var is given, set start to 0
/* Get data. */
$sql = "SELECT column_name FROM $tbl_name LIMIT $start, $limit";
$result = mysql_query($sql);
/* Setup page vars for display. */
if ($page == 0) $page = 1; //if no page var is given, default to 1.
$prev = $page - 1; //previous page is page - 1
$next = $page + 1; //next page is page + 1
$lastpage = ceil($total_pages/$limit); //lastpage is = total pages / items per page, rounded up.
$lpm1 = $lastpage - 1; //last page minus 1
/*
Now we apply our rules and draw the pagination object.
We're actually saving the code to a variable in case we want to draw it more than once.
*/
$pagination = "";
if($lastpage > 1)
{
$pagination .= "<div class=\"pagination\">";
//previous button
if ($page > 1)
$pagination.= "<a href=\"$targetpage?page=$prev\">« previous</a>";
else
$pagination.= "<span class=\"disabled\">« previous</span>";
//pages
if ($lastpage < 7 + ($adjacents * 2)) //not enough pages to bother breaking it up
{
for ($counter = 1; $counter <= $lastpage; $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
}
elseif($lastpage > 5 + ($adjacents * 2)) //enough pages to hide some
{
//close to beginning; only hide later pages
if($page < 1 + ($adjacents * 2))
{
for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
$pagination.= "...";
$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";
}
//in middle; hide some front and some back
elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))
{
$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
$pagination.= "...";
for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
$pagination.= "...";
$pagination.= "<a href=\"$targetpage?page=$lpm1\">$lpm1</a>";
$pagination.= "<a href=\"$targetpage?page=$lastpage\">$lastpage</a>";
}
//close to end; only hide early pages
else
{
$pagination.= "<a href=\"$targetpage?page=1\">1</a>";
$pagination.= "<a href=\"$targetpage?page=2\">2</a>";
$pagination.= "...";
for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)
{
if ($counter == $page)
$pagination.= "<span class=\"current\">$counter</span>";
else
$pagination.= "<a href=\"$targetpage?page=$counter\">$counter</a>";
}
}
}
//next button
if ($page < $counter - 1)
$pagination.= "<a href=\"$targetpage?page=$next\">next »</a>";
else
$pagination.= "<span class=\"disabled\">next »</span>";
$pagination.= "</div>\n";
}
?>
<?php
while($row = mysql_fetch_array($result))
{
// Your while loop here
}
?>
<?=$pagination?>
Please make changes according to your code style
答案 2 :(得分：0)
请根据需要进行更改。您可以轻松地设置页面导航的样式。
<?php
if(!empty($_GET["start"])){
$start = $_GET['start'];// To take care global variable if OFF
}else{
$start = 0;
}
if(!($start > 0)) { // This variable is set to zero for the first page
$start = 0;
}
$eu = ($start - 0);
$limit = 5; // No of records to be shown per page.
$whathis = $eu + $limit;
$back = $eu - $limit;
$next = $eu + $limit;
// to check the total number of records
$query = mysql_query(" SELECT * FROM <tablename> ") or die (mysql_error());
$total_rows = mysql_num_rows($query);
//select the record with limitation
$query = mysql_query(" SELECT * FROM <tablename> limit $eu, $limit ") or die (mysql_error());
//code for previous
if($back >=0) {
echo "<a href='yourpage.php?start=$back'><font face='Verdana' size='2'>PREV</font></a> ";
}
//code for the number of page with links
$i = 0;
$x = 1;
for($i=0;$i < $total_rows;$i=$i+$limit){
if($i != $eu){
echo "<a href='yourpage.php?start=$i'><font face='Verdana' size='2'>$x</font></a> ";
}else {
echo "<font face='Verdana' size='4' color=red>$x</font>";
} // Current page is not displayed as link and given font color red
$x = $x+1;
}
//code for next
if($whathis < $total_rows) {
echo "<a href='yourpage.php?start=$next'><font face='Verdana' size='2'>NEXT</font></a>";
}
?>