Question

我正在尝试创建分页页面，但我已经卡在这里：

<?php  
    global $limit, $sql, $url, $pagesize, $pagecount, $absolutepage, $recordcount;  

    // Configuration...  
    $db = pg_Connect("dbname=Test user=postgres password=1111");

// If current page number, use it 
// if not, set one! 

if(!isset($_GET['page'])){ 
$page = 1; 
} else { 
$page = $_GET['page']; 
} 

// Define the number of results per page 
$max_results = 10; 

// Figure out the limit for the query based 
// on the current page number. 
$from = (($page * $max_results) - $max_results); 

// Perform MySQL query on only the current page number's results 

$sql = pg_query("SELECT * FROM import.mock_data LIMIT $from OFFSET $max_results"); //LIMIT $pagesize OFFSET $offset

while($row = pg_fetch_array($sql)){ 
// Build your formatted results here. 
echo $row['first_name']."<br />"; 
} 

// Figure out the total number of results in DB: 
$total_results = pg_result(pg_query("SELECT COUNT(*) as Num FROM import.mock_data"),0); 

// Figure out the total number of pages. Always round up using ceil() 
$total_pages = ceil($total_results / $max_results); 

// Build Page Number Hyperlinks 
echo "<center>Selecione uma página<br />"; 

// Build Previous Link 
if($page > 1){ 
$prev = ($page - 1); 
echo "<a href=\"".$_SERVER['PHP_SELF']."?page=$prev\"><<Previous</a>&nbsp;"; 
} 

for($i = 1; $i <= $total_pages; $i++){ 
if(($page) == $i){ 
echo "$i&nbsp;"; 
} else { 
echo "<a href=\"".$_SERVER['PHP_SELF']."?page=$i\">$i</a>&nbsp;"; 
} 
} 

// Build Next Link 
if($page < $total_pages){ 
$next = ($page + 1); 
echo "<a href=\"".$_SERVER['PHP_SELF']."?page=$next\">Next>></a>"; 
} 
echo "</center>"; 
?>

此时我有这个问题： 1-在开始时不显示任何内容，只在第2页和第2页上显示... 2 - 它不是专用的，而是将第3页的下十条记录添加到第2页的前10条记录中。

Answer 1

问题在于第一个SELECT查询

$sql = pg_query("SELECT * FROM import.mock_data LIMIT $from OFFSET $max_results");
                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

当您从一个页面跳到另一个页面时，使用当前逻辑，您的OFFSET将相同，LIMIT将从0,10,20增加，依此类推。而实际上它应该是另一种方式。因此，您的SELECT查询应该是这样的：

$sql = pg_query("SELECT * FROM import.mock_data LIMIT $max_results OFFSET $from");

Answer 2

你有太多错误。

首先你必须像这样计算偏移量

if(isset($_GET['page']))
{
    $page = $_GET{'page'} + 1;
    $from = $max_results * $page ;
}
else 
{
            $page = 0;
            $from = 0;
}

请点击此链接 https://www.tutorialspoint.com/php/mysql_paging_php.htm

用php / postgresql分页

2 个答案: