一个简单php和mysql数据分页程序_php教程

<?php

// Adam's Custom PHP MySQL Pagination Tutorial and Script

// You have to put your mysql connection data and alter the SQL queries(both queries)

// This script is in tutorial form and is accompanied by the following video:

mysql_connect("DB_Host_Here","DB_Username_Here","DB_Password_Here") or die (mysql_error());

mysql_select_db("DB_Name_Here") or die (mysql_error());

//////////////  QUERY THE MEMBER DATA INITIALLY LIKE YOU NORMALLY WOULD

$sql = mysql_query("SELECT id, firstname, country FROM myTable ORDER BY id ASC");

//////////////////////////////////// Adam's Pagination Logic ////////////////////////////////////////////////////////////////////////

$nr = mysql_num_rows($sql); // Get total of Num rows from the database query

if (isset($_GET['pn'])) { // Get pn from URL vars if it is present

    $pn = preg_replace('#[^0-9]#i', '', $_GET['pn']); // filter everything but numbers for security(new)

    //$pn = ereg_replace("[^0-9]", "", $_GET['pn']); // filter everything but numbers for security(deprecated)

} else { // If the pn URL variable is not present force it to be value of page number 1

    $pn = 1;

}

//This is where we set how many database items to show on each page

$itemsPerPage = 10;

// Get the value of the last page in the pagination result set

$lastPage = ceil($nr / $itemsPerPage);

// Be sure URL variable $pn(page number) is no lower than page 1 and no higher than $lastpage

if ($pn < 1) { // If it is less than 1

    $pn = 1; // force if to be 1

} else if ($pn > $lastPage) { // if it is greater than $lastpage

    $pn = $lastPage; // force it to be $lastpage's value

}

// This creates the numbers to click in between the next and back buttons

// This section is explained well in the video that accompanies this script

$centerPages = "";

$sub1 = $pn - 1;

$sub2 = $pn - 2;

$add1 = $pn + 1;

$add2 = $pn + 2;

if ($pn == 1) {

    $centerPages .= '  <span class="pagNumActive">' . $pn . '</span>  ';

    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '">' . $add1 . '</a>  ';

} else if ($pn == $lastPage) {

    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '">' . $sub1 . '</a>  ';

    $centerPages .= '  <span class="pagNumActive">' . $pn . '</span>  ';

} else if ($pn > 2 && $pn < ($lastPage - 1)) {

    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub2 . '">' . $sub2 . '</a>  ';

    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '">' . $sub1 . '</a>  ';

    $centerPages .= '  <span class="pagNumActive">' . $pn . '</span>  ';

    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '">' . $add1 . '</a>  ';

    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add2 . '">' . $add2 . '</a>  ';

} else if ($pn > 1 && $pn < $lastPage) {

    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $sub1 . '">' . $sub1 . '</a>  ';

    $centerPages .= '  <span class="pagNumActive">' . $pn . '</span>  ';

    $centerPages .= '  <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $add1 . '">' . $add1 . '</a>  ';

}

// This line sets the "LIMIT" range... the 2 values we place to choose a range of rows from database in our query

$limit = 'LIMIT ' .($pn - 1) * $itemsPerPage .',' .$itemsPerPage;

// Now we are going to run the same query as above but this time add $limit onto the end of the SQL syntax

// $sql2 is what we will use to fuel our while loop statement below

$sql2 = mysql_query("SELECT id, firstname, country FROM myTable ORDER BY id ASC $limit");

//////////////////////////////// END Adam's Pagination Logic ////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////// Adam's Pagination Display Setup /////////////////////////////////////////////////////////////////////

$paginationDisplay = ""; // Initialize the pagination output variable

// This code runs only if the last page variable is ot equal to 1, if it is only 1 page we require no paginated links to display

if ($lastPage != "1"){

    // This shows the user what page they are on, and the total number of pages

    $paginationDisplay .= 'Page <strong>' . $pn . '</strong> of ' . $lastPage. '        ';

    // If we are not on page 1 we can place the Back button

    if ($pn != 1) {

        $previous = $pn - 1;

        $paginationDisplay .=  '   <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $previous . '"> Back</a> ';

    }

    // Lay in the clickable numbers display here between the Back and Next links

    $paginationDisplay .= '<span class="paginationNumbers">' . $centerPages . '</span>';

    // If we are not on the very last page we can place the Next button

    if ($pn != $lastPage) {

        $nextPage = $pn + 1;

        $paginationDisplay .=  '   <a href="' . $_SERVER['PHP_SELF'] . '?pn=' . $nextPage . '"> Next</a> ';

    }

}

///////////////////////////////////// END Adam's Pagination Display Setup ///////////////////////////////////////////////////////////////////////////

// Build the Output Section Here

$outputList = '';

while($row = mysql_fetch_array($sql2)){

    $id = $row["id"];

    $firstname = $row["firstname"];

    $country = $row["country"];

    $outputList .= '<h1>' . $firstname . '</h1><h2>' . $country . ' </h2><hr />';



} // close while loop

?>

<html>

<head>

<title>Adam's Pagination</title>

<style type="text/css">



</style>

</head>

<body>

   <div style="margin-left:64px; margin-right:64px;">

     <h2>Total Items: <?php echo $nr; ?></h2>

   </div>

      <div style="margin-left:58px; margin-right:58px; padding:6px; background-color:#FFF; border:#999 1px solid;"><?php echo $paginationDisplay; ?></div>

      <div style="margin-left:64px; margin-right:64px;"><?php print "$outputList"; ?></div>

      <div style="margin-left:58px; margin-right:58px; padding:6px; background-color:#FFF; border:#999 1px solid;"><?php echo $paginationDisplay; ?></div>

</body>

</html>

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一个简单php和mysql数据分页程序